feat: add support for wasi:logging

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "west"
-version = "0.1.0"
+version = "0.1.2"
 description = "WebAssembly component test runtime"
 
 authors.workspace = true

crates/sys/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "west-sys"
-version = "0.1.1"
+version = "0.1.2"
 description = "WebAssembly component test runtime C bindings"
 
 authors.workspace = true

src/lib.rs

@@ -1,7 +1,7 @@
 use core::time::Duration;
 
 use anyhow::Context as _;
-use tracing::instrument;
+use tracing::{info, instrument};
 use wasi_preview1_component_adapter_provider::{
     WASI_SNAPSHOT_PREVIEW1_ADAPTER_NAME, WASI_SNAPSHOT_PREVIEW1_REACTOR_ADAPTER,
 };
@@ -49,6 +49,19 @@ impl WasiHttpView for Ctx {
     }
 }
 
+impl bindings::wasi::logging::logging::Host for Ctx {
+    #[instrument(level = "trace", skip_all, ret(level = "trace"))]
+    fn log(
+        &mut self,
+        level: bindings::wasi::logging::logging::Level,
+        context: String,
+        message: String,
+    ) -> wasmtime::Result<()> {
+        info!(?level, context, message);
+        Ok(())
+    }
+}
+
 impl bindings::wasiext::http::ext::Host for Ctx {
     #[instrument(level = "trace", skip_all, ret(level = "trace"))]
     fn new_response_outparam(

wit/deps.lock

@@ -22,11 +22,15 @@ sha512 = "124cbe0e0c97856d3bdb504ea569c212652fe534abd151d29b7957d3ce59435690ecf8
 sha256 = "2a74bd811adc46b5a0f19827ddbde89870e52b17615f4d0873f06fd977250caf"
 sha512 = "94624f00c66e66203592cee820f80b1ba91ecdb71f682c154f25eaf71f8d8954197dcb64503bc21e72ed5e812af7eae876df47b7eb727b02db3a74a7ce0aefca"
 
+[logging]
+sha256 = "9676b482485bb0fd2751a390374c1108865a096b7037f4b5dbe524f066bfb06e"
+sha512 = "30a621a6d48a0175e8047c062e618523a85f69c45a7c31918da2b888f7527fce1aca67fa132552222725d0f6cdcaed95be7f16c28488d9468c0fad00cb7450b9"
+
 [passthrough]
 url = "https://github.com/wasiext/passthrough/archive/main.tar.gz"
-sha256 = "2b1d396cb65661c8e72a227b595615bfff852e5e1d11a4c757e2edfd88f2d69e"
-sha512 = "24548865215c168b13dc51c92b7a96b34d1d37ac9915f639db1e4e7fd0d4a8feff745d038d526974e28a8a8fe34c45f4a5b19282b522bde09d2d67bf653addfc"
-deps = ["cli", "clocks", "filesystem", "http", "httpext", "io", "random", "sockets"]
+sha256 = "e0e68af9daec38b16b3c7697e94e806837640c8f8eb165cc309257a17e78a393"
+sha512 = "da9a4566a004ab549bc02b96a57591ff2dde19c6561a5079f492e585cd60b0263d01276d26605c953dce93723bf58ee3b02c3d3a1911ba457b625cec39938716"
+deps = ["cli", "clocks", "filesystem", "http", "httpext", "io", "logging", "random", "sockets"]
 
 [random]
 sha256 = "9e2d5056186f81b2e7f96bc97d2babd0341840f6abb4f170449b70992f1b598f"

wit/deps/logging/logging.wit

@@ -0,0 +1,35 @@
+/// WASI Logging is a logging API intended to let users emit log messages with
+/// simple priority levels and context values.
+interface logging {
+    /// A log level, describing a kind of message.
+    enum level {
+       /// Describes messages about the values of variables and the flow of
+       /// control within a program.
+       trace,
+
+       /// Describes messages likely to be of interest to someone debugging a
+       /// program.
+       debug,
+
+       /// Describes messages likely to be of interest to someone monitoring a
+       /// program.
+       info,
+
+       /// Describes messages indicating hazardous situations.
+       warn,
+
+       /// Describes messages indicating serious errors.
+       error,
+
+       /// Describes messages indicating fatal errors.
+       critical,
+    }
+
+    /// Emit a log message.
+    ///
+    /// A log message has a `level` describing what kind of message is being
+    /// sent, a context, which is an uninterpreted string meant to help
+    /// consumers group similar messages, and a string containing the message
+    /// text.
+    log: func(level: level, context: string, message: string);
+}

wit/deps/logging/world.wit

@@ -0,0 +1,5 @@
+package wasi:logging;
+
+world imports {
+    import logging;
+}

wit/deps/passthrough/passthrough.wit

@@ -19,6 +19,7 @@ world passthrough {
     export wasi:io/[email protected];
     export wasi:io/[email protected];
     export wasi:io/[email protected];
+    export wasi:logging/logging;
     export wasi:random/[email protected];
     export wasi:random/[email protected];
     export wasi:random/[email protected];
@@ -47,6 +48,7 @@ world passthrough {
     import wasi:io/[email protected];
     import wasi:io/[email protected];
     import wasi:io/[email protected];
+    import wasi:logging/logging;
     import wasi:random/[email protected];
     import wasi:random/[email protected];
     import wasi:random/[email protected];

wit/west.wit

@@ -2,4 +2,6 @@ package west:[email protected];
 
 world imports {
     include wasiext:http/imports@0.1.0;
+
+    import wasi:logging/logging;
 }