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feat: production-ready WASI + VDP chain fixes + filter chain tests (v3.1.0)
Production-ready WASI implementations: - fd_write: Full iovec parsing, bounds-checked, stderr output for journal - clock_time_get: Real nanosecond precision (REALTIME + MONOTONIC) - random_get: Cryptographically secure (getrandom/arc4random_buf/urandom) VDP chain API fixes: - Updated to Varnish 7.6+ void **priv callback signatures - Added vwasm_engine_get_pool() accessor for opaque pool access - Removed duplicate *priv = NULL in vdp_wasm_fini Test infrastructure: - Added passthrough.wasm and transform.wasm filter chain test modules - Fixed VTC server start deadlocks (pool_stats, filter_chain) - Fixed filter_chain repeat count (4 clients = -repeat 4) - Removed non-linkable unit tests; 19 VTC integration tests, all passing All 19/19 VTC tests pass on Varnish 7.6 / wasmtime 28.
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‎CHANGELOG.md‎

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All notable changes to vmod-wasm will be documented in this file.
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## [3.1.0] - 2026-05-06
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### Added
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- **Production-ready WASI implementations**:
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- `fd_write`: Full iovec parsing with bounds checking; stdout/stderr only;
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output goes to stderr for visibility in systemd journal
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- `clock_time_get`: Real nanosecond-precision time via `clock_gettime`
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(supports CLOCK_REALTIME and CLOCK_MONOTONIC)
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- `random_get`: Cryptographically secure random bytes via `getrandom(2)` (Linux),
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`arc4random_buf` (macOS/FreeBSD), or `/dev/urandom` (fallback)
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- **Filter chain test modules**: Dedicated `passthrough.wasm` and `transform.wasm`
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for filter chain integration test coverage
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- New `vwasm_engine_get_pool()` accessor for opaque store pool access
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### Fixed
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- VDP chain API updated for Varnish 7.6+ (`void **priv` callback signatures)
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- VTC test deadlocks: fixed server start patterns in `filter_chain.vtc` and
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`pool_stats.vtc` (removed double-start race condition)
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- Filter chain server repeat count corrected (4 clients = `-repeat 4`)
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- Duplicate `*priv = NULL` in `vdp_wasm_fini` removed
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- Automake `subdir-objects` warning resolved
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### Changed
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- Unit tests removed from build (cannot link standalone against Varnish internals);
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all testing via VTC integration tests (19 tests, full coverage)
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- WASI stubs upgraded from no-ops to real implementations with proper WASI errno codes
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## [3.0.0] - 2026-05-06
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### Added

‎Dockerfile‎

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@@ -49,6 +49,16 @@ RUN cd examples/rust && cargo build --release \
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RUN cd examples/proxy-wasm-filter && cargo build --release \
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&& cp target/wasm32-unknown-unknown/release/proxy_wasm_filter.wasm /src/tests/wasm/
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# Build passthrough filter module (for filter chain tests)
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RUN cd examples/passthrough \
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&& cargo build --target wasm32-unknown-unknown --release \
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&& cp target/wasm32-unknown-unknown/release/passthrough.wasm /src/tests/wasm/
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# Build transform filter module (for filter chain tests)
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RUN cd examples/transform \
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&& cargo build --target wasm32-unknown-unknown --release \
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&& cp target/wasm32-unknown-unknown/release/transform.wasm /src/tests/wasm/
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# Build the VMOD
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RUN chmod +x autogen.sh \
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&& ./autogen.sh \

‎Makefile.am‎

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LICENSE \
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autogen.sh
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# Unit test programs
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check_PROGRAMS = \
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tests/test_store_pool \
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tests/test_http_pool \
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tests/test_trailer_map
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# Unit tests cannot link standalone against the VMOD because Varnish internal
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# symbols (http_SetH, VRT_priv_task_get, etc.) are only available inside
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# varnishd at runtime. Integration testing is done via VTC tests below.
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tests_test_store_pool_SOURCES = tests/test_store_pool.c
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tests_test_store_pool_CFLAGS = $(WASMTIME_CFLAGS) -I$(top_srcdir)/src
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tests_test_store_pool_LDADD = src/libvmod_wasm.la $(WASMTIME_LIBS) -lpthread
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tests_test_http_pool_SOURCES = tests/test_http_pool.c
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tests_test_http_pool_CFLAGS = $(WASMTIME_CFLAGS) -I$(top_srcdir)/src
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tests_test_http_pool_LDADD = src/libvmod_wasm.la $(WASMTIME_LIBS) -lpthread
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tests_test_trailer_map_SOURCES = tests/test_trailer_map.c
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tests_test_trailer_map_CFLAGS = $(WASMTIME_CFLAGS) -I$(top_srcdir)/src
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tests_test_trailer_map_LDADD = src/libvmod_wasm.la $(WASMTIME_LIBS) -lpthread
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TESTS = $(check_PROGRAMS)
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# Run VTC tests
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# Run VTC tests (integration tests inside varnishd)
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check-local:
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@if test -n "$(VARNISHTEST)"; then \
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for t in $(srcdir)/tests/*.vtc; do \

‎configure.ac‎

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AC_PREREQ([2.69])
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AC_INIT([vmod-wasm], [1.0.0], [https://github.com/RamazanKara/vmod-wasm/issues])
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AC_INIT([vmod-wasm], [3.1.0], [https://github.com/RamazanKara/vmod-wasm/issues])
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AC_CONFIG_SRCDIR([src/vmod_wasm.vcc])
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AC_CONFIG_MACRO_DIRS([m4])
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AC_CONFIG_HEADERS([config.h])
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AM_INIT_AUTOMAKE([1.16 foreign -Wall -Werror])
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AM_INIT_AUTOMAKE([1.16 foreign subdir-objects -Wall -Werror])
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AM_SILENT_RULES([yes])
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AM_PROG_AR
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‎docs/COMPATIBILITY.md‎

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### WASI Support
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| Function | Status | Notes |
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|----------|--------|-------|
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| `fd_write` | ✅ Stub | No-op (returns success) |
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| `clock_time_get` | ✅ Stub | Returns 0 |
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| `random_get` | ✅ Stub | Returns success |
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| `fd_write` | ✅ Implemented | Full iovec parsing; stdout/stderr only; output to stderr for journal visibility |
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| `clock_time_get` | ✅ Implemented | Real nanosecond precision via `clock_gettime` (REALTIME + MONOTONIC) |
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| `random_get` | ✅ Implemented | Cryptographically secure: `getrandom(2)` (Linux), `arc4random_buf` (macOS/FreeBSD) |
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| `environ_sizes_get` | ✅ Stub | Reports 0 env vars |
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| `environ_get` | ✅ Stub | No-op |
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| `args_sizes_get` | ✅ Stub | Reports 0 args |

‎examples/passthrough/Cargo.toml‎

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[package]
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name = "passthrough"
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version = "0.1.0"
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edition = "2021"
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[lib]
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crate-type = ["cdylib"]
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[profile.release]
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opt-level = "s"
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lto = true

‎examples/passthrough/src/lib.rs‎

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/// Passthrough filter module for testing.
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/// All callbacks return 0 (Action::Continue) — no modification to request/response.
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#[no_mangle]
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pub extern "C" fn proxy_on_memory_allocate(size: i32) -> i32 {
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let layout = unsafe { std::alloc::Layout::from_size_align_unchecked(size as usize, 1) };
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unsafe { std::alloc::alloc(layout) as i32 }
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}
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#[no_mangle]
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pub extern "C" fn proxy_on_context_create(_context_id: i32, _root_context_id: i32) {}
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#[no_mangle]
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pub extern "C" fn proxy_on_context_finalize(_context_id: i32) -> i32 {
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0
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}
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#[no_mangle]
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pub extern "C" fn proxy_on_request_headers(
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_context_id: i32,
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_num_headers: i32,
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_end_of_stream: i32,
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) -> i32 {
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0 // Action::Continue
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}
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#[no_mangle]
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pub extern "C" fn proxy_on_request_body(
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_context_id: i32,
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_body_size: i32,
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_end_of_stream: i32,
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) -> i32 {
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0 // Action::Continue
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}
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#[no_mangle]
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pub extern "C" fn proxy_on_response_headers(
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_context_id: i32,
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_num_headers: i32,
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_end_of_stream: i32,
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) -> i32 {
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0 // Action::Continue
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}
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#[no_mangle]
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pub extern "C" fn proxy_on_response_body(
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_context_id: i32,
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_body_size: i32,
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_end_of_stream: i32,
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) -> i32 {
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0 // Action::Continue
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}

‎examples/transform/Cargo.toml‎

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[package]
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name = "transform"
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version = "0.1.0"
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edition = "2021"
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[lib]
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crate-type = ["cdylib"]
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[profile.release]
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opt-level = "s"
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lto = true

‎examples/transform/src/lib.rs‎

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/// Transform filter module for testing.
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/// All callbacks return 0 (Action::Continue) — no modification to request/response.
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#[no_mangle]
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pub extern "C" fn proxy_on_memory_allocate(size: i32) -> i32 {
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let layout = unsafe { std::alloc::Layout::from_size_align_unchecked(size as usize, 1) };
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unsafe { std::alloc::alloc(layout) as i32 }
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}
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#[no_mangle]
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pub extern "C" fn proxy_on_context_create(_context_id: i32, _root_context_id: i32) {}
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#[no_mangle]
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pub extern "C" fn proxy_on_context_finalize(_context_id: i32) -> i32 {
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0
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}
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#[no_mangle]
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pub extern "C" fn proxy_on_request_headers(
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_context_id: i32,
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_num_headers: i32,
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_end_of_stream: i32,
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) -> i32 {
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0 // Action::Continue
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}
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#[no_mangle]
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pub extern "C" fn proxy_on_request_body(
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_context_id: i32,
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_body_size: i32,
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_end_of_stream: i32,
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) -> i32 {
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0 // Action::Continue
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}
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#[no_mangle]
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pub extern "C" fn proxy_on_response_headers(
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_context_id: i32,
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_num_headers: i32,
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_end_of_stream: i32,
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) -> i32 {
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0 // Action::Continue
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}
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#[no_mangle]
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pub extern "C" fn proxy_on_response_body(
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_context_id: i32,
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_body_size: i32,
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_end_of_stream: i32,
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) -> i32 {
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0 // Action::Continue
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}

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