Use spacetimedb-standalone to get schema for spacetime generate

crates/cli/src/subcommands/generate.rs

@@ -1,20 +1,21 @@
 #![warn(clippy::uninlined_format_args)]
 
+use anyhow::Context;
 use clap::parser::ValueSource;
 use clap::Arg;
 use clap::ArgAction::Set;
 use fs_err as fs;
-use spacetimedb_codegen::{
-    compile_wasm, extract_descriptions_from_module, generate, Csharp, Lang, Rust, TypeScript, AUTO_GENERATED_PREFIX,
-};
+use spacetimedb_codegen::{generate, Csharp, Lang, Rust, TypeScript, AUTO_GENERATED_PREFIX};
 use spacetimedb_lib::de::serde::DeserializeWrapper;
+use spacetimedb_lib::{sats, RawModuleDef};
 use spacetimedb_schema;
 use spacetimedb_schema::def::ModuleDef;
 use std::path::{Path, PathBuf};
+use std::process::{Command, Stdio};
 
 use crate::tasks::csharp::dotnet_format;
 use crate::tasks::rust::rustfmt;
-use crate::util::y_or_n;
+use crate::util::{resolve_sibling_binary, y_or_n};
 use crate::Config;
 use crate::{build, common_args};
 use clap::builder::PossibleValue;
@@ -88,6 +89,15 @@ pub fn cli() -> clap::Command {
 }
 
 pub async fn exec(config: Config, args: &clap::ArgMatches) -> anyhow::Result<()> {
+    exec_ex(config, args, extract_descriptions).await
+}
+
+/// Like `exec`, but lets you specify a custom a function to extract a schema from a file.
+pub async fn exec_ex(
+    config: Config,
+    args: &clap::ArgMatches,
+    extract_descriptions: ExtractDescriptions,
+) -> anyhow::Result<()> {
     let project_path = args.get_one::<PathBuf>("project_path").unwrap();
     let wasm_file = args.get_one::<PathBuf>("wasm_file").cloned();
     let json_module = args.get_many::<PathBuf>("json_module");
@@ -101,13 +111,13 @@ pub async fn exec(config: Config, args: &clap::ArgMatches) -> anyhow::Result<()>
         return Err(anyhow::anyhow!("--namespace is only supported with --lang csharp"));
     }
 
-    let module = if let Some(mut json_module) = json_module {
-        let DeserializeWrapper(module) = if let Some(path) = json_module.next() {
+    let module: ModuleDef = if let Some(mut json_module) = json_module {
+        let DeserializeWrapper::<RawModuleDef>(module) = if let Some(path) = json_module.next() {
             serde_json::from_slice(&fs::read(path)?)?
         } else {
             serde_json::from_reader(std::io::stdin().lock())?
         };
-        module
+        module.try_into()?
     } else {
         let wasm_path = if let Some(path) = wasm_file {
             println!("Skipping build. Instead we are inspecting {}", path.display());
@@ -117,12 +127,9 @@ pub async fn exec(config: Config, args: &clap::ArgMatches) -> anyhow::Result<()>
         };
         let spinner = indicatif::ProgressBar::new_spinner();
         spinner.enable_steady_tick(std::time::Duration::from_millis(60));
-        spinner.set_message("Compiling wasm...");
-        let module = compile_wasm(&wasm_path)?;
         spinner.set_message("Extracting schema from wasm...");
-        extract_descriptions_from_module(module)?
+        extract_descriptions(&wasm_path).context("could not extract schema")?
     };
-    let module: ModuleDef = module.try_into()?;
 
     fs::create_dir_all(out_dir)?;
 
@@ -234,3 +241,16 @@ impl Language {
         Ok(())
     }
 }
+
+pub type ExtractDescriptions = fn(&Path) -> anyhow::Result<ModuleDef>;
+fn extract_descriptions(wasm_file: &Path) -> anyhow::Result<ModuleDef> {
+    let bin_path = resolve_sibling_binary("spacetimedb-standalone")?;
+    let child = Command::new(&bin_path)
+        .arg("extract-schema")
+        .arg(wasm_file)
+        .stdout(Stdio::piped())
+        .spawn()
+        .with_context(|| format!("failed to spawn {}", bin_path.display()))?;
+    let sats::serde::SerdeWrapper::<RawModuleDef>(module) = serde_json::from_reader(child.stdout.unwrap())?;
+    Ok(module.try_into()?)
+}

crates/cli/src/subcommands/start.rs

@@ -6,6 +6,8 @@ use anyhow::Context;
 use clap::{Arg, ArgMatches};
 use spacetimedb_paths::SpacetimePaths;
 
+use crate::util::resolve_sibling_binary;
+
 pub fn cli() -> clap::Command {
     clap::Command::new("start")
         .about("Start a local SpacetimeDB instance")
@@ -45,12 +47,7 @@ pub async fn exec(paths: &SpacetimePaths, args: &ArgMatches) -> anyhow::Result<E
         Edition::Standalone => "spacetimedb-standalone",
         Edition::Cloud => "spacetimedb-cloud",
     };
-    let resolved_exe = std::env::current_exe().context("could not retrieve current exe")?;
-    let bin_path = resolved_exe
-        .parent()
-        .unwrap()
-        .join(bin_name)
-        .with_extension(std::env::consts::EXE_EXTENSION);
+    let bin_path = resolve_sibling_binary(bin_name)?;
     let mut cmd = Command::new(&bin_path);
     cmd.arg("start")
         .arg("--data-dir")

crates/cli/src/util.rs

@@ -5,7 +5,7 @@ use spacetimedb_auth::identity::{IncomingClaims, SpacetimeIdentityClaims};
 use spacetimedb_client_api_messages::name::GetNamesResponse;
 use spacetimedb_lib::Identity;
 use std::io::Write;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 
 use crate::config::Config;
 use crate::login::{spacetimedb_login_force, DEFAULT_AUTH_HOST};
@@ -320,3 +320,13 @@ pub async fn get_login_token_or_log_in(
         spacetimedb_login_force(config, &host, true).await
     }
 }
+
+pub fn resolve_sibling_binary(bin_name: &str) -> anyhow::Result<PathBuf> {
+    let resolved_exe = std::env::current_exe().context("could not retrieve current exe")?;
+    let bin_path = resolved_exe
+        .parent()
+        .unwrap()
+        .join(bin_name)
+        .with_extension(std::env::consts::EXE_EXTENSION);
+    Ok(bin_path)
+}

crates/codegen/Cargo.toml

@@ -15,7 +15,6 @@ spacetimedb-schema.workspace = true
 anyhow.workspace = true
 convert_case.workspace = true
 itertools.workspace = true
-wasmtime.workspace = true
 
 [dev-dependencies]
 fs-err.workspace = true

crates/codegen/src/lib.rs

@@ -1,13 +1,5 @@
-use std::mem;
-use std::path::Path;
-
-use anyhow::Context;
-use spacetimedb_lib::{bsatn, RawModuleDefV8};
-use spacetimedb_lib::{RawModuleDef, MODULE_ABI_MAJOR_VERSION};
-use spacetimedb_primitives::errno;
 use spacetimedb_schema::def::{ModuleDef, ReducerDef, ScopedTypeName, TableDef, TypeDef};
 use spacetimedb_schema::identifier::Identifier;
-use wasmtime::{Caller, StoreContextMut};
 
 mod code_indenter;
 pub mod csharp;
@@ -49,115 +41,3 @@ pub trait Lang {
     fn generate_reducer(&self, module: &ModuleDef, reducer: &ReducerDef) -> String;
     fn generate_globals(&self, module: &ModuleDef) -> Vec<(String, String)>;
 }
-
-pub fn extract_descriptions(wasm_file: &Path) -> anyhow::Result<RawModuleDef> {
-    let module = compile_wasm(wasm_file)?;
-    extract_descriptions_from_module(module)
-}
-
-pub fn compile_wasm(wasm_file: &Path) -> anyhow::Result<wasmtime::Module> {
-    wasmtime::Module::from_file(&wasmtime::Engine::default(), wasm_file)
-}
-
-#[allow(clippy::disallowed_macros)]
-pub fn extract_descriptions_from_module(module: wasmtime::Module) -> anyhow::Result<RawModuleDef> {
-    let engine = module.engine();
-    let ctx = WasmCtx {
-        mem: None,
-        sink: Vec::new(),
-    };
-    let mut store = wasmtime::Store::new(engine, ctx);
-    let mut linker = wasmtime::Linker::new(engine);
-    linker.allow_shadowing(true).define_unknown_imports_as_traps(&module)?;
-    let module_name = &*format!("spacetime_{MODULE_ABI_MAJOR_VERSION}.0");
-    linker.func_wrap(
-        module_name,
-        "console_log",
-        |mut caller: Caller<'_, WasmCtx>,
-         _level: u32,
-         _target_ptr: u32,
-         _target_len: u32,
-         _filename_ptr: u32,
-         _filename_len: u32,
-         _line_number: u32,
-         message_ptr: u32,
-         message_len: u32| {
-            let (mem, _) = WasmCtx::mem_env(&mut caller);
-            let slice = deref_slice(mem, message_ptr, message_len).unwrap();
-            println!("from wasm: {}", String::from_utf8_lossy(slice));
-        },
-    )?;
-    linker.func_wrap(module_name, "bytes_sink_write", WasmCtx::bytes_sink_write)?;
-    let instance = linker.instantiate(&mut store, &module)?;
-    let memory = instance.get_memory(&mut store, "memory").context("no memory export")?;
-    store.data_mut().mem = Some(memory);
-
-    let mut preinits = instance
-        .exports(&mut store)
-        .filter_map(|exp| Some((exp.name().strip_prefix("__preinit__")?.to_owned(), exp.into_func()?)))
-        .collect::<Vec<_>>();
-    preinits.sort_by(|(a, _), (b, _)| a.cmp(b));
-    for (_, func) in preinits {
-        func.typed(&store)?.call(&mut store, ())?
-    }
-    let module: RawModuleDef = match instance.get_func(&mut store, "__describe_module__") {
-        Some(f) => {
-            store.data_mut().sink = Vec::new();
-            f.typed::<u32, ()>(&store)?.call(&mut store, 1)?;
-            let buf = mem::take(&mut store.data_mut().sink);
-            bsatn::from_slice(&buf)?
-        }
-        // TODO: shouldn't we return an error here?
-        None => RawModuleDef::V8BackCompat(RawModuleDefV8::default()),
-    };
-    Ok(module)
-}
-
-struct WasmCtx {
-    mem: Option<wasmtime::Memory>,
-    sink: Vec<u8>,
-}
-
-fn deref_slice(mem: &[u8], offset: u32, len: u32) -> anyhow::Result<&[u8]> {
-    anyhow::ensure!(offset != 0, "ptr is null");
-    mem.get(offset as usize..)
-        .and_then(|s| s.get(..len as usize))
-        .context("pointer out of bounds")
-}
-
-fn read_u32(mem: &[u8], offset: u32) -> anyhow::Result<u32> {
-    Ok(u32::from_le_bytes(deref_slice(mem, offset, 4)?.try_into().unwrap()))
-}
-
-impl WasmCtx {
-    pub fn get_mem(&self) -> wasmtime::Memory {
-        self.mem.expect("Initialized memory")
-    }
-
-    fn mem_env<'a>(ctx: impl Into<StoreContextMut<'a, Self>>) -> (&'a mut [u8], &'a mut Self) {
-        let ctx = ctx.into();
-        let mem = ctx.data().get_mem();
-        mem.data_and_store_mut(ctx)
-    }
-
-    pub fn bytes_sink_write(
-        mut caller: Caller<'_, Self>,
-        sink_handle: u32,
-        buffer_ptr: u32,
-        buffer_len_ptr: u32,
-    ) -> anyhow::Result<u32> {
-        if sink_handle != 1 {
-            return Ok(errno::NO_SUCH_BYTES.get().into());
-        }
-
-        let (mem, env) = Self::mem_env(&mut caller);
-
-        // Read `buffer_len`, i.e., the capacity of `buffer` pointed to by `buffer_ptr`.
-        let buffer_len = read_u32(mem, buffer_len_ptr)?;
-        // Write `buffer` to `sink`.
-        let buffer = deref_slice(mem, buffer_ptr, buffer_len)?;
-        env.sink.extend(buffer);
-
-        Ok(0)
-    }
-}

crates/codegen/tests/codegen.rs

@@ -1,21 +1,20 @@
-use spacetimedb_codegen::{extract_descriptions, generate, Csharp, Rust, TypeScript};
+use spacetimedb_codegen::{generate, Csharp, Rust, TypeScript};
 use spacetimedb_data_structures::map::HashMap;
+use spacetimedb_schema::def::ModuleDef;
 use spacetimedb_testing::modules::{CompilationMode, CompiledModule};
-use std::path::Path;
 use std::sync::OnceLock;
 
-fn compiled_module() -> &'static Path {
-    static COMPILED_MODULE: OnceLock<CompiledModule> = OnceLock::new();
+fn compiled_module() -> &'static ModuleDef {
+    static COMPILED_MODULE: OnceLock<ModuleDef> = OnceLock::new();
     COMPILED_MODULE
-        .get_or_init(|| CompiledModule::compile("module-test", CompilationMode::Debug))
-        .path()
+        .get_or_init(|| CompiledModule::compile("module-test", CompilationMode::Debug).extract_schema_blocking())
 }
 
 macro_rules! declare_tests {
     ($($name:ident => $lang:expr,)*) => ($(
         #[test]
         fn $name() {
-            let module = extract_descriptions(compiled_module()).unwrap().try_into().unwrap();
+            let module = compiled_module();
             let outfiles = HashMap::<_, _>::from_iter(generate(&module, &$lang));
             insta::with_settings!({ sort_maps => true }, {
                 insta::assert_toml_snapshot!(outfiles);