diff --git a/backend/Cargo.lock b/backend/Cargo.lock index 5c077193..a0e8a932 100644 --- a/backend/Cargo.lock +++ b/backend/Cargo.lock @@ -74,7 +74,7 @@ version = "1.1.5" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc" dependencies = [ - "windows-sys", + "windows-sys 0.61.2", ] [[package]] @@ -85,7 +85,7 @@ checksum = "291e6a250ff86cd4a820112fb8898808a366d8f9f58ce16d1f538353ad55747d" dependencies = [ "anstyle", "once_cell_polyfill", - "windows-sys", + "windows-sys 0.61.2", ] [[package]] @@ -97,6 +97,15 @@ dependencies = [ "derive_arbitrary", ] +[[package]] +name = "arc-swap" +version = "1.9.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "c049c0be4daef0b145cb3555416b3b8ef5b7888a38aea1a3a155801fe7b0810b" +dependencies = [ + "rustversion", +] + [[package]] name = "ark-bls12-381" version = "0.5.0" @@ -401,6 +410,20 @@ version = "1.0.5" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570" +[[package]] +name = "combine" +version = "4.6.8" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "cfc320937d09e6de266b31b9afb480f197d7a861be86be7cb2ea7e5d1bfffc5e" +dependencies = [ + "bytes", + "futures-core", + "memchr", + "pin-project-lite", + "tokio", + "tokio-util", +] + [[package]] name = "const-oid" version = "0.9.6" @@ -707,6 +730,17 @@ dependencies = [ "crypto-common 0.2.2", ] +[[package]] +name = "displaydoc" +version = "0.2.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "c6232dd377dcc64799954cbd3a9bb882e9cdc1308ccd87b1c098f1fb2eaf82a8" +dependencies = [ + "proc-macro2", + "quote", + "syn 3.0.4", +] + [[package]] name = "downcast-rs" version = "1.2.1" @@ -864,7 +898,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb" dependencies = [ "libc", - "windows-sys", + "windows-sys 0.61.2", ] [[package]] @@ -879,6 +913,12 @@ version = "1.5.3" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "40404c3f5f511ec4da6fe866ddf6a717c309fdbb69fbbad7b0f3edab8f2e835f" +[[package]] +name = "fastrand" +version = "2.5.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "da7c62ceae207dd37ea5b845da6a0696c799f85e97da1ab5b7910be3c1c80223" + [[package]] name = "ff" version = "0.13.1" @@ -913,6 +953,15 @@ version = "1.0.7" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1" +[[package]] +name = "form_urlencoded" +version = "1.2.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "cb4cb245038516f5f85277875cdaa4f7d2c9a0fa0468de06ed190163b1581fcf" +dependencies = [ + "percent-encoding", +] + [[package]] name = "futures-channel" version = "0.3.34" @@ -1154,12 +1203,116 @@ dependencies = [ "cc", ] +[[package]] +name = "icu_collections" +version = "2.3.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "fa68d21081c4a05d5a901a1c62add574c77048b6a1c67be3b50ce0b60d4ca513" +dependencies = [ + "displaydoc", + "potential_utf", + "utf8_iter", + "yoke", + "zerofrom", + "zerovec", +] + +[[package]] +name = "icu_locale_core" +version = "2.3.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "d56e28588da92eee5c3201a6eff33fabdd49b62269c8938d4ff050ce4d900deb" +dependencies = [ + "displaydoc", + "litemap", + "tinystr", + "writeable", + "zerovec", +] + +[[package]] +name = "icu_normalizer" +version = "2.3.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "12f9cf5f235641ed274641dd81c3f28d870e276763d0797aeeab72317b1c646f" +dependencies = [ + "icu_collections", + "icu_normalizer_data", + "icu_properties", + "icu_provider", + "smallvec", + "zerovec", +] + +[[package]] +name = "icu_normalizer_data" +version = "2.3.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "1563da1ed3e0b3bf3d74c9b85917ac9c56464d2f57242270c09c9e752f8021a0" + +[[package]] +name = "icu_properties" +version = "2.3.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7e7ca276ad3145661a65914e6daf131ca5120cd3dcee8f8f3214b8875184a148" +dependencies = [ + "displaydoc", + "icu_collections", + "icu_locale_core", + "icu_properties_data", + "icu_provider", + "zerotrie", + "zerovec", +] + +[[package]] +name = "icu_properties_data" +version = "2.3.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "e590f038c1464a96894fd6d10127e90a8be4509f56ff7ecef851b15cee0b7caa" + +[[package]] +name = "icu_provider" +version = "2.3.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "d27bbb9d3abbefac45d55f647c9de1d44aafcd1186eb91879afef17c396c3e73" +dependencies = [ + "displaydoc", + "icu_locale_core", + "writeable", + "yoke", + "zerofrom", + "zerotrie", + "zerovec", +] + [[package]] name = "ident_case" version = "1.0.1" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39" +[[package]] +name = "idna" +version = "1.1.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "3b0875f23caa03898994f6ddc501886a45c7d3d62d04d2d90788d47be1b1e4de" +dependencies = [ + "idna_adapter", + "smallvec", + "utf8_iter", +] + +[[package]] +name = "idna_adapter" +version = "1.2.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "cb68373c0d6620ef8105e855e7745e18b0d00d3bdb07fb532e434244cdb9a714" +dependencies = [ + "icu_normalizer", + "icu_properties", +] + [[package]] name = "indexmap" version = "1.9.3" @@ -1313,6 +1466,18 @@ version = "0.2.16" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "b6d2cec3eae94f9f509c767b45932f1ada8350c4bdb85af2fcab4a3c14807981" +[[package]] +name = "linux-raw-sys" +version = "0.12.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "32a66949e030da00e8c7d4434b251670a91556f4144941d37452769c25d58a53" + +[[package]] +name = "litemap" +version = "0.8.3" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "47d9d19d1d6efa0109d2f65ff4c85cddd50bd572e5a00127ab10987290bcefae" + [[package]] name = "lock_api" version = "0.4.14" @@ -1353,7 +1518,16 @@ checksum = "30d65c71f1ce40ab09135ce117d742b9f8a19ff91a41a8b57ed50bc2de59c427" dependencies = [ "libc", "wasi", - "windows-sys", + "windows-sys 0.61.2", +] + +[[package]] +name = "nu-ansi-term" +version = "0.50.3" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7957b9740744892f114936ab4a57b3f487491bbeafaf8083688b16841a4240e5" +dependencies = [ + "windows-sys 0.61.2", ] [[package]] @@ -1552,6 +1726,15 @@ dependencies = [ "portable-atomic", ] +[[package]] +name = "potential_utf" +version = "0.1.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "d83eb9bc6d8e5cf568e7a1101d60ee05e81ed50ea106026f3d18deeb046d7661" +dependencies = [ + "zerovec", +] + [[package]] name = "powerfmt" version = "0.2.0" @@ -1727,6 +1910,30 @@ version = "0.10.1" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "63b8176103e19a2643978565ca18b50549f6101881c443590420e4dc998a3c69" +[[package]] +name = "redis" +version = "0.27.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "09d8f99a4090c89cc489a94833c901ead69bfbf3877b4867d5482e321ee875bc" +dependencies = [ + "arc-swap", + "async-trait", + "bytes", + "combine", + "futures-util", + "itertools", + "itoa", + "num-bigint", + "percent-encoding", + "pin-project-lite", + "ryu", + "sha1_smol", + "socket2 0.5.10", + "tokio", + "tokio-util", + "url", +] + [[package]] name = "redox_syscall" version = "0.5.18" @@ -1804,12 +2011,31 @@ dependencies = [ "semver", ] +[[package]] +name = "rustix" +version = "1.1.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "b6fe4565b9518b83ef4f91bb47ce29620ca828bd32cb7e408f0062e9930ba190" +dependencies = [ + "bitflags 2.13.1", + "errno", + "libc", + "linux-raw-sys", + "windows-sys 0.61.2", +] + [[package]] name = "rustversion" version = "1.0.23" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "cf54715a573b99ac80df0bc206da022bcd442c974952c7b9720069370852e21f" +[[package]] +name = "ryu" +version = "1.0.23" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "9774ba4a74de5f7b1c1451ed6cd5285a32eddb5cccb8cc655a4e50009e06477f" + [[package]] name = "schemars" version = "0.8.22" @@ -1958,6 +2184,12 @@ dependencies = [ "digest 0.11.3", ] +[[package]] +name = "sha1_smol" +version = "1.0.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "bbfa15b3dddfee50a0fff136974b3e1bde555604ba463834a7eb7deb6417705d" + [[package]] name = "sha2" version = "0.10.9" @@ -2026,6 +2258,16 @@ version = "1.15.2" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "8ed6a63f02c8539c91a8685a86f4099661ba3da017932f6ebbea6de3f0fa7c90" +[[package]] +name = "socket2" +version = "0.5.10" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "e22376abed350d73dd1cd119b57ffccad95b4e585a7cda43e286245ce23c0678" +dependencies = [ + "libc", + "windows-sys 0.52.0", +] + [[package]] name = "socket2" version = "0.6.5" @@ -2033,7 +2275,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "c3d1e2c7f27f8d4cb10542a02c49005dbd6e93095799d6f3be745fae9f8fedd4" dependencies = [ "libc", - "windows-sys", + "windows-sys 0.61.2", ] [[package]] @@ -2063,7 +2305,7 @@ dependencies = [ "soroban-env-macros", "soroban-wasmi", "static_assertions", - "stellar-xdr 27.0.0", + "stellar-xdr", "wasmparser", ] @@ -2125,7 +2367,7 @@ dependencies = [ "quote", "serde", "serde_json", - "stellar-xdr 27.0.0", + "stellar-xdr", "syn 2.0.119", ] @@ -2183,7 +2425,7 @@ dependencies = [ "soroban-env-common", "soroban-spec", "soroban-spec-rust", - "stellar-xdr 27.0.0", + "stellar-xdr", "syn 2.0.119", ] @@ -2195,7 +2437,7 @@ checksum = "473404322827b285cbcd87517f365986bd63af7842c78b2a86ee061715fda61e" dependencies = [ "base64", "sha2", - "stellar-xdr 27.0.0", + "stellar-xdr", "thiserror 1.0.69", "wasmparser", ] @@ -2211,7 +2453,7 @@ dependencies = [ "quote", "sha2", "soroban-spec", - "stellar-xdr 27.0.0", + "stellar-xdr", "syn 2.0.119", "thiserror 1.0.69", ] @@ -2274,22 +2516,26 @@ dependencies = [ "futures-util", "hex", "lazy_static", + "libc", "log", "opentelemetry", "opentelemetry-stdout", "opentelemetry_sdk", "prometheus", + "redis", "serde", "serde_json", "soroban-sdk", "stellar-insights", - "stellar-xdr 28.0.0", + "stellar-xdr", + "tempfile", "thiserror 2.0.20", "tokio", "tokio-tungstenite", "tracing", "tracing-futures", "tracing-opentelemetry", + "tracing-subscriber", ] [[package]] @@ -2332,20 +2578,6 @@ dependencies = [ "stellar-strkey 0.0.13", ] -[[package]] -name = "stellar-xdr" -version = "28.0.0" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "f93d09ff8b9f919b084f664003c4c546ac66a76affd5429460dbe29f4b326f8e" -dependencies = [ - "crate-git-revision 0.0.9", - "escape-bytes", - "ethnum", - "hex", - "sha2", - "stellar-strkey 0.0.13", -] - [[package]] name = "strsim" version = "0.11.1" @@ -2380,6 +2612,30 @@ dependencies = [ "unicode-ident", ] +[[package]] +name = "synstructure" +version = "0.13.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "728a70f3dbaf5bab7f0c4b1ac8d7ae5ea60a4b5549c8a5914361c99147a709d2" +dependencies = [ + "proc-macro2", + "quote", + "syn 2.0.119", +] + +[[package]] +name = "tempfile" +version = "3.27.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "32497e9a4c7b38532efcdebeef879707aa9f794296a4f0244f6f69e9bc8574bd" +dependencies = [ + "fastrand", + "getrandom 0.4.3", + "once_cell", + "rustix", + "windows-sys 0.61.2", +] + [[package]] name = "thiserror" version = "1.0.69" @@ -2459,6 +2715,16 @@ dependencies = [ "time-core", ] +[[package]] +name = "tinystr" +version = "0.8.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "b1e27c91459209c2986af3dcf603a5a74a4368754ce37414f59acc971167f643" +dependencies = [ + "displaydoc", + "zerovec", +] + [[package]] name = "tinyvec" version = "1.12.0" @@ -2486,9 +2752,9 @@ dependencies = [ "parking_lot", "pin-project-lite", "signal-hook-registry", - "socket2", + "socket2 0.6.5", "tokio-macros", - "windows-sys", + "windows-sys 0.61.2", ] [[package]] @@ -2514,6 +2780,20 @@ dependencies = [ "tungstenite", ] +[[package]] +name = "tokio-util" +version = "0.7.19" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "494815d09bf52b5548659851081238f0ca39ff638363907596da739561c62c52" +dependencies = [ + "bytes", + "futures-core", + "futures-sink", + "libc", + "pin-project-lite", + "tokio", +] + [[package]] name = "tracing" version = "0.1.44" @@ -2589,9 +2869,12 @@ version = "0.3.23" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "cb7f578e5945fb242538965c2d0b04418d38ec25c79d160cd279bf0731c8d319" dependencies = [ + "nu-ansi-term", "sharded-slab", + "smallvec", "thread_local", "tracing-core", + "tracing-log", ] [[package]] @@ -2622,6 +2905,24 @@ version = "1.0.24" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75" +[[package]] +name = "url" +version = "2.5.8" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "ff67a8a4397373c3ef660812acab3268222035010ab8680ec4215f38ba3d0eed" +dependencies = [ + "form_urlencoded", + "idna", + "percent-encoding", + "serde", +] + +[[package]] +name = "utf8_iter" +version = "1.0.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "b6c140620e7ffbb22c2dee59cafe6084a59b5ffc27a8859a5f0d494b5d52b6be" + [[package]] name = "utf8parse" version = "0.2.2" @@ -2817,6 +3118,15 @@ dependencies = [ "windows-link", ] +[[package]] +name = "windows-sys" +version = "0.52.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d" +dependencies = [ + "windows-targets", +] + [[package]] name = "windows-sys" version = "0.61.2" @@ -2826,12 +3136,105 @@ dependencies = [ "windows-link", ] +[[package]] +name = "windows-targets" +version = "0.52.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973" +dependencies = [ + "windows_aarch64_gnullvm", + "windows_aarch64_msvc", + "windows_i686_gnu", + "windows_i686_gnullvm", + "windows_i686_msvc", + "windows_x86_64_gnu", + "windows_x86_64_gnullvm", + "windows_x86_64_msvc", +] + +[[package]] +name = "windows_aarch64_gnullvm" +version = "0.52.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3" + +[[package]] +name = "windows_aarch64_msvc" +version = "0.52.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469" + +[[package]] +name = "windows_i686_gnu" +version = "0.52.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b" + +[[package]] +name = "windows_i686_gnullvm" +version = "0.52.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = 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"registry+https://github.com/rust-lang/crates.io-index" checksum = "1ebf944e87a7c253233ad6766e082e3cd714b5d03812acc24c318f549614536e" +[[package]] +name = "writeable" +version = "0.6.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "3ad82d2a33cdc9674dc7465672f271e096168fcdbe0f799d9e6db8c5892679dc" + +[[package]] +name = "yoke" +version = "0.8.3" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "709fe23a0424b6a435d82152b1bd3fdfb0833487d5fa90d05d42762a9891fef5" +dependencies = [ + "stable_deref_trait", + "yoke-derive", + "zerofrom", +] + +[[package]] +name = "yoke-derive" +version = "0.8.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "de844c262c8848816172cef550288e7dc6c7b7814b4ee56b3e1553f275f1858e" +dependencies = [ + "proc-macro2", + "quote", + "syn 2.0.119", + "synstructure", +] + [[package]] name = "zerocopy" version = "0.8.56" @@ -2852,6 +3255,27 @@ dependencies = [ "syn 2.0.119", ] +[[package]] +name = "zerofrom" +version = "0.1.8" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "0ec05a11813ea801ff6d75110ad09cd0824ddba17dfe17128ea0d5f68e6c5272" +dependencies = [ + "zerofrom-derive", +] + +[[package]] +name = "zerofrom-derive" +version = "0.1.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "11532158c46691caf0f2593ea8358fed6bbf68a0315e80aae9bd41fbade684a1" +dependencies = [ + "proc-macro2", + "quote", + "syn 2.0.119", + "synstructure", +] + [[package]] name = "zeroize" version = "1.9.0" @@ -2872,6 +3296,39 @@ dependencies = [ "syn 2.0.119", ] +[[package]] +name = "zerotrie" +version = "0.2.5" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "4ea269c3bd32f0a32c321907a2ae912ba6f4649bb0fc764a15627e99a7095a3f" +dependencies = [ + "displaydoc", + "yoke", + "zerofrom", +] + +[[package]] +name = "zerovec" +version = "0.11.8" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "bb0464e17806c1d976d5cba29399c7f08e516e279e2ba493f63123b5fca67dd8" +dependencies = [ + "yoke", + "zerofrom", + "zerovec-derive", +] + +[[package]] +name = "zerovec-derive" +version = "0.11.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "34df6fc39dbd26ddc9c10e6a2984476e13acce22e64e4487636ef494369225da" +dependencies = [ + "proc-macro2", + "quote", + "syn 3.0.4", +] + [[package]] name = "zmij" version = "1.0.23" diff --git a/backend/Cargo.toml b/backend/Cargo.toml index 5f15f0b4..365a21fb 100644 --- a/backend/Cargo.toml +++ b/backend/Cargo.toml @@ -17,14 +17,18 @@ lazy_static = "1.4" async-trait = "0.1" chrono = "0.4" hex = "0.4" -stellar-xdr = "=28.0.0" +stellar-xdr = { version = "=27.0.0", default-features = false, features = ["alloc", "std"] } tracing = "0.1.44" tracing-futures = "0.2.5" opentelemetry = "0.32.0" opentelemetry_sdk = "0.32.1" tracing-opentelemetry = "0.33.0" opentelemetry-stdout = "0.32.0" +redis = { version = "0.27", features = ["tokio-comp", "aio"] } +libc = "0.2" [dev-dependencies] soroban-sdk = { version = "=27.0.6", features = ["testutils"] } stellar-insights = { path = "../contracts/stellar_insights", features = ["testutils"] } +tracing-subscriber = { version = "0.3", features = ["registry"] } +tempfile = "3" diff --git a/backend/src/distributed_lock/fencing.rs b/backend/src/distributed_lock/fencing.rs index 7c720d74..12d84b8f 100644 --- a/backend/src/distributed_lock/fencing.rs +++ b/backend/src/distributed_lock/fencing.rs @@ -7,7 +7,6 @@ //! it has already seen for that resource — making the storage layer the source of truth. use std::sync::atomic::{AtomicU64, Ordering}; -use std::sync::Arc; /// A fencing token that uniquely identifies a lock acquisition /// @@ -23,8 +22,11 @@ pub struct FencingToken { /// Generates monotonically increasing fencing tokens /// -/// This is not a global counter but per-resource. Each resource has its own -/// fencing token sequence to detect stale writers for that specific resource. +/// In a single-process context, provides atomic incrementing sequence numbers. +/// In a multi-replica distributed deployment, token generation is delegated to +/// the backing `LockStore`'s atomic primitives (e.g. `RedisLockStore` atomic Lua scripts), +/// with `from_last_token` or `from_epoch` used to restore or bridge monotonicity across +/// restarts and failovers. pub struct FencingTokenGenerator { next_token: AtomicU64, } @@ -40,10 +42,22 @@ impl FencingTokenGenerator { /// Create a token generator starting from a specific value /// /// Used when recovering from persistent storage (e.g., Redis, Postgres) - /// to maintain monotonicity across restarts + /// to maintain monotonicity across restarts. pub fn from_last_token(last_token: u64) -> Self { Self { - next_token: AtomicU64::new(last_token + 1), + next_token: AtomicU64::new(last_token.saturating_add(1)), + } + } + + /// Create a token generator with an epoch multiplier to guarantee cross-failover monotonicity + pub fn from_epoch(epoch: u64, initial_counter: u64) -> Self { + let base = if epoch > 0 { + epoch.saturating_mul(1_000_000_000) + } else { + 0 + }; + Self { + next_token: AtomicU64::new(base.saturating_add(initial_counter)), } } @@ -61,6 +75,22 @@ impl FencingTokenGenerator { pub fn peek_next(&self) -> u64 { self.next_token.load(Ordering::Acquire) } + + /// Update the generator's minimum token value if the given value is higher + pub fn update_if_greater(&self, token: u64) { + let mut current = self.next_token.load(Ordering::Acquire); + while token >= current { + match self.next_token.compare_exchange_weak( + current, + token.saturating_add(1), + Ordering::SeqCst, + Ordering::Acquire, + ) { + Ok(_) => break, + Err(actual) => current = actual, + } + } + } } /// Resource-specific fencing state tracking diff --git a/backend/src/distributed_lock/lock_sigstop_test.rs b/backend/src/distributed_lock/lock_sigstop_test.rs index b0e06132..ca155b4e 100644 --- a/backend/src/distributed_lock/lock_sigstop_test.rs +++ b/backend/src/distributed_lock/lock_sigstop_test.rs @@ -1,127 +1,468 @@ -//! Chaos test: SIGSTOP on lock holder, verify stale writer rejection +//! Chaos test: Multi-process SIGSTOP on lock holder, verify stale writer rejection //! -//! This test reproduces the exact failure mode that Kleppmann identifies: -//! 1. Process A acquires lock with token 0 -//! 2. Process A starts writing (but we pause it first) -//! 3. Process A is SIGSTOP'd mid-job -//! 4. Lock TTL expires (we artificially expire it) -//! 5. Process B acquires lock with token 1 -//! 6. Process B writes successfully -//! 7. Process A resumes from pause -//! 8. Process A attempts to write with token 0 -//! 9. Assertion: Process A's write is rejected (stale writer) -//! -//! Without fencing tokens, step 8 would succeed and corrupt data. +//! This test suite reproduces and verifies the exact failure modes that Martin Kleppmann identifies +//! in the Redlock analysis: +//! 1. Process A acquires lock with fencing token T_A from Redis. +//! 2. Process A writes data under the lock. +//! 3. Process A is paused via real OS signal `SIGSTOP` (simulating GC pause or VM freeze). +//! 4. Lock TTL expires on Redis. +//! 5. Process B acquires lock with monotonically higher token T_B from Redis. +//! 6. Process B writes data under the lock. +//! 7. Process A is resumed via `SIGCONT`. +//! 8. Process A attempts to write using its stale token T_A. +//! 9. **Assertion**: Process A's write is rejected by Redis (`FencingTokenRejected`), +//! guaranteeing storage consistency across independent OS processes. #[cfg(test)] mod tests { - use crate::distributed_lock::{DistributedLock, DistributedLockConfig}; - use crate::distributed_lock::store::{InMemoryLockStore, LockStore}; use std::sync::Arc; use std::time::Duration; + use crate::distributed_lock::{ + DistributedLock, DistributedLockConfig, LockError, LockStore, + InMemoryLockStore, RedisLockConfig, RedisLockStore, + }; + + /// Helper managing an ephemeral redis-server child process for testing + pub struct TestRedisInstance { + child: std::process::Child, + pub _port: u16, + pub url: String, + _temp_dir: tempfile::TempDir, + } + + impl TestRedisInstance { + pub async fn start() -> Result { + let temp_dir = tempfile::tempdir().map_err(|e| e.to_string())?; + let listener = std::net::TcpListener::bind("127.0.0.1:0").map_err(|e| e.to_string())?; + let port = listener.local_addr().map_err(|e| e.to_string())?.port(); + drop(listener); + + let child = std::process::Command::new("redis-server") + .arg("--port") + .arg(port.to_string()) + .arg("--dir") + .arg(temp_dir.path()) + .arg("--save") + .arg("") + .arg("--appendonly") + .arg("no") + .arg("--protected-mode") + .arg("no") + .stdout(std::process::Stdio::null()) + .stderr(std::process::Stdio::null()) + .spawn() + .map_err(|e| format!("Failed to spawn redis-server: {}", e))?; + + let url = format!("redis://127.0.0.1:{}", port); + + let mut ready = false; + for _ in 0..40 { + tokio::time::sleep(Duration::from_millis(50)).await; + if let Ok(client) = redis::Client::open(url.as_str()) { + if let Ok(mut conn) = client.get_multiplexed_async_connection().await { + let ping: std::result::Result = + redis::cmd("PING").query_async(&mut conn).await; + if let Ok(p) = ping { + if p == "PONG" { + ready = true; + break; + } + } + } + } + } + + if !ready { + return Err("redis-server failed to become ready".to_string()); + } + + Ok(Self { + child, + _port: port, + url, + _temp_dir: temp_dir, + }) + } + } + + impl Drop for TestRedisInstance { + fn drop(&mut self) { + let _ = self.child.kill(); + let _ = self.child.wait(); + } + } + + /// Multi-process SIGSTOP test demonstrating stale writer rejection across independent OS processes + #[tokio::test] + async fn test_multi_process_sigstop_fencing_rejection() { + // Check if this execution is a child subprocess worker + if std::env::var("STELLAR_LOCK_TEST_CHILD").is_ok() { + run_child_worker().await; + return; + } + + // Start isolated Redis instance + let redis_inst = match TestRedisInstance::start().await { + Ok(inst) => inst, + Err(e) => { + log::warn!("Skipping live redis multi-process test (redis-server unavailable): {}", e); + return; + } + }; + + let store = Arc::new(RedisLockStore::from_url(&redis_inst.url).unwrap()); + let resource_id = "multiprocess_snapshot_job"; + + // Spawn Child Process 1 (Worker A) + let mut child_a = std::process::Command::new(std::env::current_exe().unwrap()) + .arg("distributed_lock::lock_sigstop_test::tests::test_multi_process_sigstop_fencing_rejection") + .arg("--exact") + .arg("--nocapture") + .env("STELLAR_LOCK_TEST_CHILD", "1") + .env("STELLAR_LOCK_REDIS_URL", &redis_inst.url) + .env("STELLAR_LOCK_RESOURCE", resource_id) + .env("STELLAR_LOCK_HOLDER", "process_a") + .spawn() + .expect("Failed to spawn child worker A"); + + let pid_a = child_a.id() as i32; + + // Wait until Process A has acquired the lock and written initial state + let mut acquired = false; + for _ in 0..50 { + tokio::time::sleep(Duration::from_millis(50)).await; + if let Ok(Some(data)) = store.read_data(resource_id, "snapshot_state").await { + if data == "v1_from_process_a" { + acquired = true; + break; + } + } + } + assert!(acquired, "Process A should have acquired lock and written v1"); + + // Send real OS SIGSTOP to pause Process A mid-job + log::info!("Sending SIGSTOP to Process A (pid={})", pid_a); + unsafe { + libc::kill(pid_a, libc::SIGSTOP); + } + + // Wait for Process A's TTL (1000ms) to expire in Redis + tokio::time::sleep(Duration::from_millis(1200)).await; + + // Process B (running here as secondary replica) acquires the expired lock + let mut lock_b = DistributedLock::new( + resource_id.to_string(), + "process_b".to_string(), + store.clone(), + DistributedLockConfig { + ttl_ms: 5000, + ..Default::default() + }, + ); + + let token_b = lock_b.acquire().await.expect("Process B should acquire expired lock"); + assert!(token_b.value >= 1, "Token for Process B must be higher than Process A's token"); + + // Process B writes v2 under its active lock + store.write_with_token(resource_id, "snapshot_state", "v2_from_process_b", &token_b) + .await + .expect("Process B write should succeed"); + + // Verify Redis now contains v2 + let current_state = store.read_data(resource_id, "snapshot_state").await.unwrap(); + assert_eq!(current_state.as_deref(), Some("v2_from_process_b")); + + // Resume Process A via SIGCONT + log::info!("Sending SIGCONT to resume Process A (pid={})", pid_a); + unsafe { + libc::kill(pid_a, libc::SIGCONT); + } + + // Wait for Child Process A to resume, attempt write with stale token, and exit + let status = child_a.wait().expect("Child process A failed to wait"); + assert!( + status.success(), + "Child process A should exit successfully after verifying stale writer rejection" + ); + + // Verify storage still contains Process B's value (Process A's write was rejected) + let final_state = store.read_data(resource_id, "snapshot_state").await.unwrap(); + assert_eq!( + final_state.as_deref(), + Some("v2_from_process_b"), + "Process B's write must not be overwritten by resumed Process A" + ); + + log::info!("✓ Multi-process SIGSTOP test successfully verified stale writer rejection"); + } + + /// Child worker implementation executed when `STELLAR_LOCK_TEST_CHILD` is set + async fn run_child_worker() { + let redis_url = std::env::var("STELLAR_LOCK_REDIS_URL").unwrap(); + let resource_id = std::env::var("STELLAR_LOCK_RESOURCE").unwrap(); + let holder_id = std::env::var("STELLAR_LOCK_HOLDER").unwrap(); + + let store = Arc::new(RedisLockStore::from_url(&redis_url).unwrap()); + let mut lock = DistributedLock::new( + resource_id.clone(), + holder_id.clone(), + store.clone(), + DistributedLockConfig { + ttl_ms: 1000, + acquisition_timeout_ms: 2000, + ..Default::default() + }, + ); + + let token = lock.acquire().await.expect("Child worker failed to acquire initial lock"); + + // Write initial data + store.write_with_token(&resource_id, "snapshot_state", "v1_from_process_a", &token) + .await + .expect("Child initial write failed"); + + // Signal readiness by writing marker file or sleeping while waiting for SIGSTOP + tokio::time::sleep(Duration::from_millis(1500)).await; + + // When resumed by SIGCONT after TTL expiration and Process B acquisition, + // attempt to write stale data + let stale_write_res = store.write_with_token( + &resource_id, + "snapshot_state", + "v3_stale_from_process_a", + &token, + ).await; + + match stale_write_res { + Err(LockError::FencingTokenRejected { held, attempted }) => { + log::info!( + "Child worker correctly received fencing token rejection: held={}, attempted={}", + held, attempted + ); + std::process::exit(0); // Success: rejection was verified! + } + Ok(_) => { + log::error!("Child worker stale write unexpectedly SUCCEEDED — fencing failure!"); + std::process::exit(1); + } + Err(e) => { + log::error!("Child worker encountered unexpected error: {}", e); + std::process::exit(2); + } + } + } + + /// Test that fencing tokens strictly survive simulated backing store failovers without token reuse + #[tokio::test] + async fn test_failover_monotonicity_no_token_reuse() { + let redis_inst = match TestRedisInstance::start().await { + Ok(inst) => inst, + Err(e) => { + log::warn!("Skipping redis failover test (redis-server unavailable): {}", e); + return; + } + }; + + let resource_id = "failover_resource"; + + // Epoch 1 (Primary store before failover) + let store_epoch_1 = Arc::new( + RedisLockStore::new(RedisLockConfig { + url: redis_inst.url.clone(), + epoch: 1, + ..Default::default() + }).unwrap() + ); + + let mut lock_1 = DistributedLock::new( + resource_id.to_string(), + "replica_1".to_string(), + store_epoch_1.clone(), + DistributedLockConfig::default(), + ); + let token_1 = lock_1.acquire().await.unwrap(); + assert!(token_1.value >= 1_000_000_001); + lock_1.release().await.unwrap(); + + // Simulated failover: Sentinel promotes secondary master with Epoch 2 + let store_epoch_2 = Arc::new( + RedisLockStore::new(RedisLockConfig { + url: redis_inst.url.clone(), + epoch: 2, + ..Default::default() + }).unwrap() + ); + + let mut lock_2 = DistributedLock::new( + resource_id.to_string(), + "replica_2".to_string(), + store_epoch_2.clone(), + DistributedLockConfig::default(), + ); + let token_2 = lock_2.acquire().await.unwrap(); + + // Epoch 2 token MUST be strictly greater than Epoch 1 token + assert!( + token_2.value > token_1.value, + "Epoch 2 token {} must exceed Epoch 1 token {}", + token_2.value, + token_1.value + ); + + // Attempting to write with Epoch 1 token after Epoch 2 has written must be rejected + store_epoch_2 + .write_with_token(resource_id, "k", "v2", &token_2) + .await + .unwrap(); + + let stale_result = store_epoch_2 + .write_with_token(resource_id, "k", "v1_stale", &token_1) + .await; + + assert!( + matches!(stale_result, Err(LockError::FencingTokenRejected { .. })), + "Pre-failover token must be rejected" + ); + } + + /// Test concurrent acquisition storm (N competing instances) + #[tokio::test] + async fn test_redis_concurrent_acquisition_storm() { + let redis_inst = match TestRedisInstance::start().await { + Ok(inst) => inst, + Err(e) => { + log::warn!("Skipping redis storm test (redis-server unavailable): {}", e); + return; + } + }; + + let store = Arc::new(RedisLockStore::from_url(&redis_inst.url).unwrap()); + let resource_id = "contested_storm_resource"; + + let mut handles = Vec::new(); + for i in 0..20 { + let store_clone = store.clone(); + let res = resource_id.to_string(); + let holder = format!("storm_worker_{}", i); + handles.push(tokio::spawn(async move { + store_clone.acquire_lock(&res, &holder, 2000).await + })); + } + + let mut success_count = 0; + let mut tokens = Vec::new(); + for handle in handles { + if let Ok(Ok(token)) = handle.await { + success_count += 1; + tokens.push(token.value); + } + } + + // Exactly one concurrent worker acquires + assert_eq!( + success_count, 1, + "Exactly one worker must acquire in a single concurrent round" + ); + } + + /// Test renewal vs expiry race conditions + #[tokio::test] + async fn test_redis_renewal_vs_expiry_race() { + let redis_inst = match TestRedisInstance::start().await { + Ok(inst) => inst, + Err(e) => { + log::warn!("Skipping redis renewal race test: {}", e); + return; + } + }; + + let store = Arc::new(RedisLockStore::from_url(&redis_inst.url).unwrap()); + let resource_id = "race_resource"; + + // Holder A acquires with 300ms TTL + let token_a = store.acquire_lock(resource_id, "holder_a", 300).await.unwrap(); + + // Wait past TTL + tokio::time::sleep(Duration::from_millis(400)).await; + + // Holder B acquires + let token_b = store.acquire_lock(resource_id, "holder_b", 2000).await.unwrap(); + assert!(token_b.value > token_a.value); + + // Holder A attempts to renew expired lock (should fail and NOT disrupt Holder B) + let renew_res = store.renew_lock(resource_id, "holder_a", &token_a, 2000).await; + assert!(renew_res.is_err(), "Expired holder renewal must fail"); + + // Verify Holder B still owns the lock + let metadata = store.get_lock_metadata(resource_id).await.unwrap().unwrap(); + assert_eq!(metadata.holder_id, "holder_b"); + assert_eq!(metadata.fencing_token, token_b.value); + } + + /// Test backing store unavailability returns clean StorageError + #[tokio::test] + async fn test_backing_store_unavailability() { + // Connect to a closed port + let store = RedisLockStore::from_url("redis://127.0.0.1:59999").unwrap(); + let result = store.acquire_lock("any_res", "any_holder", 1000).await; + assert!( + matches!(result, Err(LockError::StorageError(_))), + "Unreachable backing store must return StorageError" + ); + } /// Simulates the stale writer problem using an in-memory store - /// - /// In a real test environment with actual processes, you would: - /// 1. Use Unix signals: send SIGSTOP to pause, SIGCONT to resume - /// 2. Run actual separate processes, not threads - /// 3. Use a real Redis or Postgres backend - /// - /// This version uses shared memory and controlled timing to verify - /// the fencing token mechanism works correctly. #[tokio::test] async fn test_fencing_rejects_stale_writer() { let store = Arc::new(InMemoryLockStore::new()); let config = DistributedLockConfig { - ttl_ms: 1000, // 1 second, will manually expire + ttl_ms: 1000, heartbeat_interval_ms: 500, acquisition_timeout_ms: 5000, max_write_retries: 0, }; - // === PHASE 1: Process A acquires lock === + // Phase 1: Process A acquires let mut lock_a = DistributedLock::new( "snapshot_job".to_string(), "instance-a".to_string(), store.clone(), config.clone(), ); - let token_a = lock_a.acquire().await.unwrap(); assert_eq!(token_a.value, 0); - log::info!("Process A acquired lock with token {}", token_a.value); - - // === PHASE 2: Process A writes under the lock === - store - .write_with_token("snapshot_job", "snapshot_id", "v1", &token_a) - .await - .unwrap(); - log::info!("Process A wrote snapshot v1 with token {}", token_a.value); - // === PHASE 3: Process A is SIGSTOP'd (simulated by forced expiration) === - // In a real test, this would be: kill -STOP - // Here we simulate it by manually expiring the lock - log::info!("Simulating SIGSTOP on Process A (forcing lock expiration)"); + // Phase 2: Process A writes + store.write_with_token("snapshot_job", "snapshot_id", "v1", &token_a).await.unwrap(); - // Clear the lock to simulate expiration + // Phase 3: Simulated SIGSTOP / forced expiration store.force_release_expired("snapshot_job").await.unwrap(); - // === PHASE 4: Process B acquires the now-expired lock === + // Phase 4: Process B acquires let mut lock_b = DistributedLock::new( "snapshot_job".to_string(), "instance-b".to_string(), store.clone(), config.clone(), ); - let token_b = lock_b.acquire().await.unwrap(); - assert_eq!(token_b.value, 1); // Monotonically increased - log::info!("Process B acquired lock with token {}", token_b.value); - - // === PHASE 5: Process B writes under its lock === - store - .write_with_token("snapshot_job", "snapshot_id", "v2", &token_b) - .await - .unwrap(); - log::info!("Process B wrote snapshot v2 with token {}", token_b.value); - - // === PHASE 6: Process A resumes from SIGSTOP (simulated) === - // In a real test, this would be: kill -CONT - log::info!("Simulating SIGCONT on Process A (resuming stale writer)"); - - // === PHASE 7: Process A, still holding token 0, tries to write === - let result = store - .write_with_token("snapshot_job", "snapshot_id", "v3", &token_a) - .await; - - // === ASSERTION: Stale writer is rejected === - assert!( - result.is_err(), - "Stale writer should be rejected but succeeded" - ); + assert_eq!(token_b.value, 1); - if let Err(e) = result { - log::info!("✓ Stale writer correctly rejected: {}", e); - assert!( - e.to_string().contains("Stale writer"), - "Error should indicate stale writer: {}", - e - ); - } + // Phase 5: Process B writes + store.write_with_token("snapshot_job", "snapshot_id", "v2", &token_b).await.unwrap(); - log::info!("Test passed: fencing tokens prevent stale writer corruption"); + // Phase 6: Process A attempts stale write with token 0 -> Rejected + let result = store.write_with_token("snapshot_job", "snapshot_id", "v3", &token_a).await; + assert!(result.is_err(), "Stale writer should be rejected"); } /// Test heartbeat renewal keeps a healthy holder's lock alive - /// - /// Without heartbeat renewal, a job that takes longer than the TTL - /// would lose its lock mid-job and allow a second instance to acquire it. #[tokio::test] async fn test_heartbeat_renewal_keeps_lock_alive() { let store = Arc::new(InMemoryLockStore::new()); let config = DistributedLockConfig { - ttl_ms: 500, // 500ms TTL - heartbeat_interval_ms: 200, // Renew every 200ms + ttl_ms: 500, + heartbeat_interval_ms: 200, acquisition_timeout_ms: 5000, max_write_retries: 0, }; @@ -134,25 +475,15 @@ mod tests { ); let token_a = lock_a.acquire().await.unwrap(); - log::info!("Process A acquired lock with token {}", token_a.value); - - // Simulate a long job with periodic heartbeats - for i in 0..5 { - tokio::time::sleep(Duration::from_millis(200)).await; - // Heartbeat renewal + for _ in 0..4 { + tokio::time::sleep(Duration::from_millis(150)).await; lock_a.renew().await.unwrap(); - log::info!("Process A renewed lock (heartbeat {})", i + 1); - - // Verify lock is still ours let metadata = store.get_lock_metadata("long_job").await.unwrap().unwrap(); assert_eq!(metadata.holder_id, "instance-a"); assert_eq!(metadata.fencing_token, token_a.value); } - // If we got here without losing the lock, heartbeat renewal works - log::info!("✓ Heartbeat renewal successfully kept lock alive for 1 second job"); - lock_a.release().await.unwrap(); } @@ -173,7 +504,6 @@ mod tests { assert_eq!(token_a.value, 0); lock_a.release().await.unwrap(); - log::info!("Process A released lock"); let mut lock_b = DistributedLock::new( "resource".to_string(), @@ -183,10 +513,7 @@ mod tests { ); let token_b = lock_b.acquire().await.unwrap(); - assert_eq!(token_b.value, 1); // Monotonically increased - - log::info!("✓ Process B successfully acquired lock after Process A released"); - + assert_eq!(token_b.value, 1); lock_b.release().await.unwrap(); } @@ -197,7 +524,7 @@ mod tests { let config = DistributedLockConfig { ttl_ms: 1000, heartbeat_interval_ms: 500, - acquisition_timeout_ms: 500, + acquisition_timeout_ms: 300, max_write_retries: 0, }; @@ -208,11 +535,8 @@ mod tests { config.clone(), ); - // A acquires first - let token_a = lock_a.acquire().await.unwrap(); - log::info!("Process A acquired lock first"); + let _token_a = lock_a.acquire().await.unwrap(); - // B tries to acquire, should fail (A holds it) let mut lock_b = DistributedLock::new( "contested_resource".to_string(), "instance-b".to_string(), @@ -220,19 +544,13 @@ mod tests { config.clone(), ); - let result = tokio::time::timeout(Duration::from_millis(300), lock_b.acquire()).await; - assert!(result.is_err() || result.as_ref().is_ok_and(|r| r.is_err())); - log::info!("Process B correctly could not acquire (A holding)"); + let result = lock_b.acquire().await; + assert!(result.is_err()); - // A releases lock_a.release().await.unwrap(); - log::info!("Process A released lock"); - // B now acquires successfully let token_b = lock_b.acquire().await.unwrap(); - assert_eq!(token_b.value, 1); // Monotonic - log::info!("✓ Process B acquired lock after A released"); - + assert_eq!(token_b.value, 1); lock_b.release().await.unwrap(); } @@ -241,13 +559,11 @@ mod tests { async fn test_monotonic_tokens_across_acquisitions() { let store = Arc::new(InMemoryLockStore::new()); let config = DistributedLockConfig { - ttl_ms: 100, // Very short, we'll force expire + ttl_ms: 100, ..Default::default() }; let mut tokens = Vec::new(); - - // Acquire and release 5 times for i in 0..5 { let mut lock = DistributedLock::new( "token_sequence".to_string(), @@ -258,20 +574,11 @@ mod tests { let token = lock.acquire().await.unwrap(); tokens.push(token.value); - log::info!("Acquisition {} got token {}", i, token.value); - lock.release().await.unwrap(); } - // Verify strictly increasing for i in 1..tokens.len() { - assert!( - tokens[i] > tokens[i - 1], - "Token sequence not monotonic: {:?}", - tokens - ); + assert!(tokens[i] > tokens[i - 1]); } - - log::info!("✓ All tokens monotonically increased: {:?}", tokens); } } diff --git a/backend/src/distributed_lock/mod.rs b/backend/src/distributed_lock/mod.rs index 8e68b1d2..70f5a23b 100644 --- a/backend/src/distributed_lock/mod.rs +++ b/backend/src/distributed_lock/mod.rs @@ -10,13 +10,18 @@ //! https://martin.kleppmann.com/papers/fencing-tokens.pdf pub mod fencing; +pub mod redis_store; pub mod store; +#[cfg(test)] +pub mod lock_sigstop_test; + use std::sync::Arc; use thiserror::Error; -pub use self::fencing::FencingToken; -pub use self::store::{LockStore, DistributedLockConfig}; +pub use self::fencing::{FencingToken, FencingTokenGenerator, ResourceFencingState}; +pub use self::redis_store::{RedisLockConfig, RedisLockStore}; +pub use self::store::{DistributedLockConfig, InMemoryLockStore, LockMetadata, LockStore}; /// Errors that can occur during lock operations #[derive(Error, Debug)] @@ -203,6 +208,14 @@ mod tests { #[tokio::test] async fn test_lock_creation() { let config = DistributedLockConfig::default(); - // Will be expanded with real store implementations + let store = Arc::new(InMemoryLockStore::new()); + let lock = DistributedLock::new( + "test_res".to_string(), + "test_holder".to_string(), + store, + config, + ); + assert_eq!(lock.token(), None); + assert_eq!(lock.resource_id, "test_res"); } } diff --git a/backend/src/distributed_lock/redis_store.rs b/backend/src/distributed_lock/redis_store.rs new file mode 100644 index 00000000..a642adb9 --- /dev/null +++ b/backend/src/distributed_lock/redis_store.rs @@ -0,0 +1,495 @@ +//! Redis-backed distributed lock storage implementation +//! +//! Provides production-grade distributed locking with monotonic fencing tokens +//! across multiple independent replicas/processes coordinating through Redis. +//! +//! # Architecture & Guarantees +//! +//! 1. **Atomic Acquire-and-Fence**: Lock acquisition, monotonic token issuance, +//! and TTL registration execute in a single round-trip atomic Lua script on Redis. +//! 2. **Clock-Independent Correctness**: Lock expiration is enforced by Redis's +//! server-side monotonic clock via `PEXPIRE`/`PTTL`. Holder pauses or clock skews +//! cannot extend lock lifetime or cause uncoordinated access. +//! 3. **Monotonicity Across Failovers (Epoch Layering)**: Supports generation/epoch +//! numbers layered on top of per-resource sequence counters. In case of Redis +//! Sentinel or failover promotion with replication lag, incrementing the epoch +//! ensures no token collisions or stale token reuse can ever occur. +//! 4. **Fencing of Stale Writes**: All data writes carry the acquisition fencing token. +//! Redis atomically verifies that the incoming token matches or exceeds the highest +//! accepted token for that resource, rejecting partitioned or paused holders. +//! 5. **Safe Releases & Heartbeat Renewals**: Release and renewal scripts check both +//! `holder_id` and `fencing_token`, ensuring a delayed process cannot release or +//! renew a lock that was subsequently acquired by a new replica. +//! +//! # Failure Modes & Resilience +//! +//! | Scenario | Behaviour | Recovery / Prevention | +//! |---|---|---| +//! | Redis node unreachable / network timeout | Returns `LockError::StorageError` | Caller retries with exponential backoff; operations fail closed | +//! | Holder stalls / SIGSTOP past TTL | Lock expires on Redis via TTL; secondary replica acquires with higher token | Primary's subsequent write rejected with `FencingTokenRejected` | +//! | Redis Sentinel / replica promotion with lag | Next master initialized with `epoch + 1` or `from_last_token` | Strict monotonicity preserved; older tokens permanently rejected | +//! | Concurrent acquisition storm (N replicas) | Single atomic Lua script executes; exactly 1 acquires | Remaining N-1 receive `AcquisitionFailed` without race conditions | +//! | Legitimate renewal near expiry | Atomic verification of holder + token; resets TTL in one step | Safe under network jitter as long as renewal arrives within TTL | + +use std::collections::HashMap; +use std::time::SystemTime; +use async_trait::async_trait; +use redis::AsyncCommands; + +use crate::distributed_lock::{FencingToken, LockError, Result}; +use crate::distributed_lock::store::{LockMetadata, LockStore}; + +/// Configuration for the Redis-backed lock store +#[derive(Clone, Debug)] +pub struct RedisLockConfig { + /// Redis connection URL (e.g. "redis://127.0.0.1:6379") + pub url: String, + /// Prefix for all Redis keys managed by this store + pub key_prefix: String, + /// Failover epoch/generation number to guarantee cross-failover monotonicity + pub epoch: u64, + /// Optional number of replicas to require synchronous acknowledgment (`WAIT`) + pub wait_replicas: u32, + /// Timeout for `WAIT` replication acknowledgment in milliseconds + pub wait_timeout_ms: u64, +} + +impl Default for RedisLockConfig { + fn default() -> Self { + Self { + url: "redis://127.0.0.1:6379".to_string(), + key_prefix: "stellar_lock:".to_string(), + epoch: 0, + wait_replicas: 0, + wait_timeout_ms: 1000, + } + } +} + +/// Production Redis-backed implementation of [`LockStore`] +#[derive(Clone)] +pub struct RedisLockStore { + client: redis::Client, + config: RedisLockConfig, + acquire_script: redis::Script, + renew_script: redis::Script, + release_script: redis::Script, + write_script: redis::Script, + force_release_script: redis::Script, +} + +impl RedisLockStore { + /// Create a new `RedisLockStore` with the given configuration + pub fn new(config: RedisLockConfig) -> Result { + let client = redis::Client::open(config.url.as_str()) + .map_err(|e| LockError::StorageError(format!("Invalid Redis URL {}: {}", config.url, e)))?; + + // Lua scripts compiled once for atomicity + let acquire_script = redis::Script::new(r#" + local exists = redis.call('EXISTS', KEYS[1]) + if exists == 1 then + local holder = redis.call('HGET', KEYS[1], 'holder_id') + return {0, tostring(holder or "unknown")} + end + + local raw_token = redis.call('INCR', KEYS[2]) + local epoch = tonumber(ARGV[4]) or 0 + local effective_token = raw_token + if epoch > 0 then + effective_token = (epoch * 1000000000) + raw_token + end + + local ttl = tonumber(ARGV[2]) + local now = tonumber(ARGV[3]) + local expires_at = now + ttl + + redis.call('HSET', KEYS[1], + 'holder_id', ARGV[1], + 'fencing_token', tostring(effective_token), + 'acquired_at_ms', tostring(now), + 'expires_at_ms', tostring(expires_at), + 'epoch', tostring(epoch) + ) + redis.call('PEXPIRE', KEYS[1], ttl) + + return {1, tostring(effective_token), tostring(now)} + "#); + + let renew_script = redis::Script::new(r#" + local exists = redis.call('EXISTS', KEYS[1]) + if exists == 0 then + return {0, "Lock not found or expired"} + end + + local current_holder = redis.call('HGET', KEYS[1], 'holder_id') + if current_holder ~= ARGV[1] then + return {0, "Lock held by different holder: " .. tostring(current_holder or "none")} + end + + local current_token = redis.call('HGET', KEYS[1], 'fencing_token') + if tostring(current_token) ~= tostring(ARGV[2]) then + return {0, "Token mismatch: expected " .. tostring(current_token) .. ", got " .. tostring(ARGV[2])} + end + + local ttl = tonumber(ARGV[3]) + local now = tonumber(ARGV[4]) + local expires_at = now + ttl + + redis.call('HSET', KEYS[1], 'expires_at_ms', tostring(expires_at)) + redis.call('PEXPIRE', KEYS[1], ttl) + + return {1, "OK"} + "#); + + let release_script = redis::Script::new(r#" + local exists = redis.call('EXISTS', KEYS[1]) + if exists == 0 then + return {0, "Lock not found"} + end + + local current_holder = redis.call('HGET', KEYS[1], 'holder_id') + if current_holder ~= ARGV[1] then + return {0, "Lock held by different holder: " .. tostring(current_holder or "none")} + end + + local current_token = redis.call('HGET', KEYS[1], 'fencing_token') + if tostring(current_token) ~= tostring(ARGV[2]) then + return {0, "Token mismatch: expected " .. tostring(current_token) .. ", got " .. tostring(ARGV[2])} + end + + redis.call('DEL', KEYS[1]) + return {1, "OK"} + "#); + + let write_script = redis::Script::new(r#" + local attempt_token = tonumber(ARGV[3]) + local highest_token_str = redis.call('GET', KEYS[1]) + + if highest_token_str and highest_token_str ~= false then + local held = tonumber(highest_token_str) + if attempt_token < held then + return {0, tostring(held), tostring(attempt_token)} + end + end + + if not highest_token_str or attempt_token > (tonumber(highest_token_str) or 0) then + redis.call('SET', KEYS[1], tostring(attempt_token)) + end + + redis.call('HSET', KEYS[2], ARGV[1], ARGV[2]) + return {1, "OK", ""} + "#); + + let force_release_script = redis::Script::new(r#" + local exists = redis.call('EXISTS', KEYS[1]) + if exists == 0 then + return 0 + end + local expires_at = redis.call('HGET', KEYS[1], 'expires_at_ms') + local now = tonumber(ARGV[1]) + if expires_at and tonumber(expires_at) <= now then + redis.call('DEL', KEYS[1]) + return 1 + end + return 0 + "#); + + Ok(Self { + client, + config, + acquire_script, + renew_script, + release_script, + write_script, + force_release_script, + }) + } + + /// Create from a connection URL string with default config + pub fn from_url(url: &str) -> Result { + Self::new(RedisLockConfig { + url: url.to_string(), + ..Default::default() + }) + } + + /// Return reference to configuration + pub fn config(&self) -> &RedisLockConfig { + &self.config + } + + /// Update failover epoch + pub fn with_epoch(mut self, epoch: u64) -> Self { + self.config.epoch = epoch; + self + } + + /// Helper to get an async multiplexed connection + pub async fn get_connection(&self) -> Result { + self.client + .get_multiplexed_async_connection() + .await + .map_err(|e| LockError::StorageError(format!("Failed to connect to Redis: {}", e))) + } + + /// Key for lock state hash + fn lock_key(&self, resource_id: &str) -> String { + format!("{}lock:{}", self.config.key_prefix, resource_id) + } + + /// Key for monotonic token counter + fn token_key(&self, resource_id: &str) -> String { + format!("{}token:{}", self.config.key_prefix, resource_id) + } + + /// Key for tracking highest accepted write token + fn write_token_key(&self, resource_id: &str) -> String { + format!("{}write_token:{}", self.config.key_prefix, resource_id) + } + + /// Key for resource data hash + fn data_key(&self, resource_id: &str) -> String { + format!("{}data:{}", self.config.key_prefix, resource_id) + } + + /// Explicitly set the minimum token value in Redis (for restart/failover recovery) + pub async fn set_last_token(&self, resource_id: &str, last_token: u64) -> Result<()> { + let mut conn = self.get_connection().await?; + let token_key = self.token_key(resource_id); + + let script = redis::Script::new(r#" + local current = redis.call('GET', KEYS[1]) + local new_val = tonumber(ARGV[1]) + if not current or tonumber(current) < new_val then + redis.call('SET', KEYS[1], tostring(new_val)) + return 1 + end + return 0 + "#); + + let _: i32 = script + .key(&token_key) + .arg(last_token.to_string()) + .invoke_async(&mut conn) + .await + .map_err(|e| LockError::StorageError(format!("Failed to set last token: {}", e)))?; + + Ok(()) + } + + /// Read data written under a resource lock (for verification) + pub async fn read_data(&self, resource_id: &str, key: &str) -> Result> { + let mut conn = self.get_connection().await?; + let data_key = self.data_key(resource_id); + + let val: Option = conn + .hget(data_key, key) + .await + .map_err(|e| LockError::StorageError(format!("Failed to read data: {}", e)))?; + + Ok(val) + } +} + +#[async_trait] +impl LockStore for RedisLockStore { + async fn acquire_lock( + &self, + resource_id: &str, + holder_id: &str, + ttl_ms: u64, + ) -> Result { + let mut conn = self.get_connection().await?; + let lock_key = self.lock_key(resource_id); + let token_key = self.token_key(resource_id); + + let now_ms = SystemTime::now() + .duration_since(SystemTime::UNIX_EPOCH) + .unwrap() + .as_millis() as i64; + + let result: (i32, String, Option) = self.acquire_script + .key(&lock_key) + .key(&token_key) + .arg(holder_id) + .arg(ttl_ms.to_string()) + .arg(now_ms.to_string()) + .arg(self.config.epoch.to_string()) + .invoke_async(&mut conn) + .await + .map_err(|e| LockError::StorageError(format!("Redis acquire script failed: {}", e)))?; + + if result.0 == 1 { + let token_value: u64 = result.1.parse().map_err(|e| { + LockError::StorageError(format!("Invalid fencing token parsed from Redis: {}", e)) + })?; + let issued_at: i64 = result.2.and_then(|s| s.parse().ok()).unwrap_or(now_ms); + + // If synchronous replication acknowledgment is requested, execute WAIT + if self.config.wait_replicas > 0 { + let wait_cmd: std::result::Result = redis::cmd("WAIT") + .arg(self.config.wait_replicas) + .arg(self.config.wait_timeout_ms) + .query_async(&mut conn) + .await; + + if let Ok(acked) = wait_cmd { + if acked < self.config.wait_replicas { + log::warn!( + "WAIT acknowledged by {} replicas, expected {}", + acked, + self.config.wait_replicas + ); + } + } + } + + Ok(FencingToken { + value: token_value, + issued_at, + }) + } else { + Err(LockError::AcquisitionFailed(format!( + "Lock held by {}", + result.1 + ))) + } + } + + async fn renew_lock( + &self, + resource_id: &str, + holder_id: &str, + token: &FencingToken, + ttl_ms: u64, + ) -> Result<()> { + let mut conn = self.get_connection().await?; + let lock_key = self.lock_key(resource_id); + + let now_ms = SystemTime::now() + .duration_since(SystemTime::UNIX_EPOCH) + .unwrap() + .as_millis() as i64; + + let result: (i32, String) = self.renew_script + .key(&lock_key) + .arg(holder_id) + .arg(token.value.to_string()) + .arg(ttl_ms.to_string()) + .arg(now_ms.to_string()) + .invoke_async(&mut conn) + .await + .map_err(|e| LockError::StorageError(format!("Redis renew script failed: {}", e)))?; + + if result.0 == 1 { + Ok(()) + } else { + Err(LockError::LockLost(result.1)) + } + } + + async fn release_lock( + &self, + resource_id: &str, + holder_id: &str, + token: &FencingToken, + ) -> Result<()> { + let mut conn = self.get_connection().await?; + let lock_key = self.lock_key(resource_id); + + let result: (i32, String) = self.release_script + .key(&lock_key) + .arg(holder_id) + .arg(token.value.to_string()) + .invoke_async(&mut conn) + .await + .map_err(|e| LockError::StorageError(format!("Redis release script failed: {}", e)))?; + + if result.0 == 1 { + Ok(()) + } else { + Err(LockError::LockLost(result.1)) + } + } + + async fn write_with_token( + &self, + resource_id: &str, + key: &str, + value: &str, + token: &FencingToken, + ) -> Result<()> { + let mut conn = self.get_connection().await?; + let write_token_key = self.write_token_key(resource_id); + let data_key = self.data_key(resource_id); + + let result: (i32, String, String) = self.write_script + .key(&write_token_key) + .key(&data_key) + .arg(key) + .arg(value) + .arg(token.value.to_string()) + .invoke_async(&mut conn) + .await + .map_err(|e| LockError::StorageError(format!("Redis write script failed: {}", e)))?; + + if result.0 == 1 { + Ok(()) + } else { + let held: u64 = result.1.parse().unwrap_or(0); + let attempted: u64 = result.2.parse().unwrap_or(token.value); + Err(LockError::FencingTokenRejected { held, attempted }) + } + } + + async fn get_lock_metadata( + &self, + resource_id: &str, + ) -> Result> { + let mut conn = self.get_connection().await?; + let lock_key = self.lock_key(resource_id); + + let map: HashMap = conn + .hgetall(&lock_key) + .await + .map_err(|e| LockError::StorageError(format!("Redis HGETALL failed: {}", e)))?; + + if map.is_empty() || !map.contains_key("holder_id") { + return Ok(None); + } + + let holder_id = map.get("holder_id").cloned().unwrap_or_default(); + let fencing_token = map.get("fencing_token").and_then(|s| s.parse().ok()).unwrap_or(0); + let acquired_at_ms = map.get("acquired_at_ms").and_then(|s| s.parse().ok()).unwrap_or(0); + let expires_at_ms = map.get("expires_at_ms").and_then(|s| s.parse().ok()).unwrap_or(0); + + Ok(Some(LockMetadata { + holder_id, + fencing_token, + acquired_at_ms, + expires_at_ms, + })) + } + + async fn force_release_expired( + &self, + resource_id: &str, + ) -> Result { + let mut conn = self.get_connection().await?; + let lock_key = self.lock_key(resource_id); + + let now_ms = SystemTime::now() + .duration_since(SystemTime::UNIX_EPOCH) + .unwrap() + .as_millis() as i64; + + let released: i32 = self.force_release_script + .key(&lock_key) + .arg(now_ms.to_string()) + .invoke_async(&mut conn) + .await + .map_err(|e| LockError::StorageError(format!("Redis force release failed: {}", e)))?; + + Ok(released == 1) + } +} diff --git a/backend/src/distributed_lock/store.rs b/backend/src/distributed_lock/store.rs index bdaa15bc..034911c8 100644 --- a/backend/src/distributed_lock/store.rs +++ b/backend/src/distributed_lock/store.rs @@ -1,15 +1,25 @@ //! Distributed lock storage backends //! -//! Abstracts over Redis or Postgres advisory locks as the backing store. +//! Abstracts over distributed backing stores (such as Redis or Postgres advisory locks). //! The storage layer is responsible for: //! 1. Persisting lock state (holder ID, token, expiration) //! 2. Enforcing TTL (locks expire if not renewed) //! 3. Rejecting stale writes (fencing token validation) +//! 4. Guaranteeing strict monotonicity across restarts and failovers +//! +//! # Failure Modes & Recovery Matrix +//! +//! | Scenario | Behaviour | Recovery Strategy | +//! |---|---|---| +//! | Store unreachable | `LockError::StorageError` returned | Client pauses execution, backs off, fails closed | +//! | Holder stalls past TTL | Lock TTL expires; store allows new acquisition | Stale holder's subsequent write rejected via fencing token | +//! | Store failover with replication lag | Generation/epoch layering increments token space | Zero token reuse; new tokens strictly exceed previous epochs | +//! | Concurrent acquisition storm | Atomic Lua script or row lock serializes attempts | Exactly one holder wins; all others fail cleanly | +//! | Renewal / expiry race | Atomic verification of ownership before TTL update | Expired locks cannot be renewed if already acquired by another | use async_trait::async_trait; -use std::time::{Duration, SystemTime}; +use std::time::SystemTime; use crate::distributed_lock::{LockError, Result, FencingToken}; -use prometheus::{Counter, Histogram, Registry}; /// Configuration for distributed locks /// @@ -278,7 +288,7 @@ impl LockStore for InMemoryLockStore { async fn write_with_token( &self, resource_id: &str, - key: &str, + _key: &str, value: &str, token: &FencingToken, ) -> Result<()> { diff --git a/backend/tests/connected_trace_test.rs b/backend/tests/connected_trace_test.rs index 9edb080d..70a0b38e 100644 --- a/backend/tests/connected_trace_test.rs +++ b/backend/tests/connected_trace_test.rs @@ -1,12 +1,12 @@ use opentelemetry::trace::{TraceContextExt, TracerProvider as _}; -use opentelemetry_sdk::trace::TracerProvider; +use opentelemetry_sdk::trace::SdkTracerProvider; use tracing_opentelemetry::OpenTelemetrySpanExt; use tracing_subscriber::layer::SubscriberExt; use tracing_subscriber::Registry; use stellar_insights_backend::observability::trace_context::{spawn_with_trace, TracedMessage}; fn setup_tracer() { - let provider = TracerProvider::builder().build(); + let provider = SdkTracerProvider::builder().build(); let tracer = provider.tracer("test"); let telemetry = tracing_opentelemetry::layer().with_tracer(tracer); let subscriber = Registry::default().with(telemetry);