logging: adds clock scope (#1071)

Signed-off-by: Adrian Cole <adrian@tetrate.io>

cmd/wazero/wazero.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"crypto/rand"
+	"errors"
 	"flag"
 	"fmt"
 	"io"
@@ -123,10 +124,10 @@ func doRun(args []string, stdOut io.Writer, stdErr logging.Writer, exit func(cod
 			"This may be specified multiple times. When <wasm path> is unset, <path> is used. "+
 			"For read-only mounts, append the suffix ':ro'.")
 
-	var hostlogging sliceFlag
+	var hostlogging logScopesFlag
 	flags.Var(&hostlogging, "hostlogging",
 		"A scope of host functions to log to stderr. "+
-			"This may be specified multiple times. Supported values: filesystem,random")
+			"This may be specified multiple times. Supported values: clock,filesystem,random")
 
 	cacheDir := cacheDirFlag(flags)
 
@@ -173,7 +174,7 @@ func doRun(args []string, stdOut io.Writer, stdErr logging.Writer, exit func(cod
 
 	wasmExe := filepath.Base(wasmPath)
 
-	ctx := maybeHostLogging(context.Background(), hostlogging, stdErr, exit)
+	ctx := maybeHostLogging(context.Background(), logging.LogScopes(hostlogging), stdErr)
 
 	rtc := wazero.NewRuntimeConfig()
 	if cache := maybeUseCacheDir(cacheDir, stdErr, exit); cache != nil {
@@ -294,25 +295,10 @@ func detectImports(imports []api.FunctionDefinition) (needsWASI, needsGo bool) {
 	return
 }
 
-func maybeHostLogging(ctx context.Context, hostLogging []string, stdErr logging.Writer, exit func(code int)) context.Context {
+func maybeHostLogging(ctx context.Context, scopes logging.LogScopes, stdErr logging.Writer) context.Context {
-	var scopes logging.LogScopes
-	for _, h := range hostLogging {
-		switch h {
-		case "":
-		case "random":
-			scopes |= logging.LogScopeRandom
-		case "filesystem":
-			scopes |= logging.LogScopeFilesystem
-		default:
-			fmt.Fprintf(stdErr, "invalid hostLogging value: %v\n", h)
-			exit(1)
-		}
-	}
-
 	if scopes != 0 {
-		ctx = context.WithValue(ctx, experimental.FunctionListenerFactoryKey{}, logging.NewHostLoggingListenerFactory(stdErr, scopes))
+		return context.WithValue(ctx, experimental.FunctionListenerFactoryKey{}, logging.NewHostLoggingListenerFactory(stdErr, scopes))
 	}
-
 	return ctx
 }
 
@@ -374,3 +360,24 @@ func (f *sliceFlag) Set(s string) error {
 	*f = append(*f, s)
 	return nil
 }
+
+type logScopesFlag logging.LogScopes
+
+func (f *logScopesFlag) String() string {
+	return logging.LogScopes(*f).String()
+}
+
+func (f *logScopesFlag) Set(s string) error {
+	switch s {
+	case "":
+	case "clock":
+		*f |= logScopesFlag(logging.LogScopeClock)
+	case "filesystem":
+		*f |= logScopesFlag(logging.LogScopeFilesystem)
+	case "random":
+		*f |= logScopesFlag(logging.LogScopeRandom)
+	default:
+		return errors.New("not a log scope")
+	}
+	return nil
+}

cmd/wazero/wazero_test.go

@@ -14,6 +14,7 @@ import (
 	"testing"
 
 	"github.com/tetratelabs/wazero/api"
+	"github.com/tetratelabs/wazero/experimental/logging"
 	"github.com/tetratelabs/wazero/imports/wasi_snapshot_preview1"
 	"github.com/tetratelabs/wazero/internal/platform"
 	"github.com/tetratelabs/wazero/internal/testing/require"
@@ -354,9 +355,9 @@ func TestRun(t *testing.T) {
 	}
 
 	cryptoTest := test{
-		name:       "GOARCH=wasm GOOS=js hostlogging=random and filesystem",
+		name:       "GOARCH=wasm GOOS=js hostlogging=filesystem random",
 		wasm:       wasmCat,
-		wazeroOpts: []string{"--hostlogging=random", "--hostlogging=filesystem"},
+		wazeroOpts: []string{"--hostlogging=filesystem", "--hostlogging=random"},
 		wasmArgs:   []string{"/bear.txt"},
 		expectedStderr: `==> go.runtime.getRandomData(r_len=32)
 <==
@@ -526,6 +527,55 @@ func Test_detectImports(t *testing.T) {
 	}
 }
 
+func Test_logScopesFlag(t *testing.T) {
+	tests := []struct {
+		name     string
+		values   []string
+		expected logging.LogScopes
+	}{
+		{
+			name:     "defaults to none",
+			expected: logging.LogScopeNone,
+		},
+		{
+			name:     "ignores empty",
+			values:   []string{""},
+			expected: logging.LogScopeNone,
+		},
+		{
+			name:     "clock",
+			values:   []string{"clock"},
+			expected: logging.LogScopeClock,
+		},
+		{
+			name:     "filesystem",
+			values:   []string{"filesystem"},
+			expected: logging.LogScopeFilesystem,
+		},
+		{
+			name:     "random",
+			values:   []string{"random"},
+			expected: logging.LogScopeRandom,
+		},
+		{
+			name:     "clock filesystem random",
+			values:   []string{"clock", "filesystem", "random"},
+			expected: logging.LogScopeClock | logging.LogScopeFilesystem | logging.LogScopeRandom,
+		},
+	}
+
+	for _, tt := range tests {
+		tc := tt
+		t.Run(tc.name, func(t *testing.T) {
+			f := logScopesFlag(0)
+			for _, v := range tc.values {
+				require.NoError(t, f.Set(v))
+			}
+			require.Equal(t, tc.expected, logging.LogScopes(f))
+		})
+	}
+}
+
 func TestHelp(t *testing.T) {
 	exitCode, _, stdErr := runMain(t, []string{"-h"})
 	require.Equal(t, 0, exitCode)

experimental/logging/log_listener.go

@@ -31,6 +31,8 @@ type LogScopes = logging.LogScopes
 const (
 	// LogScopeNone means nothing should be logged
 	LogScopeNone = logging.LogScopeNone
+	// LogScopeClock enables logging for functions such as `clock_time_get`.
+	LogScopeClock = logging.LogScopeClock
 	// LogScopeFilesystem enables logging for functions such as `path_open`.
 	// Note: This doesn't log writes to the console.
 	LogScopeFilesystem = logging.LogScopeFilesystem

imports/wasi_snapshot_preview1/clock_test.go

@@ -36,8 +36,8 @@ func Test_clockResGet(t *testing.T) {
 			clockID:        ClockIDRealtime,
 			expectedMemory: expectedMemoryMicro,
 			expectedLog: `
-==> wasi_snapshot_preview1.clock_res_get(id=0,result.resolution=16)
+==> wasi_snapshot_preview1.clock_res_get(id=realtime)
-<== errno=ESUCCESS
+<== (resolution=1000,errno=ESUCCESS)
 `,
 		},
 		{
@@ -45,8 +45,8 @@ func Test_clockResGet(t *testing.T) {
 			clockID:        ClockIDMonotonic,
 			expectedMemory: expectedMemoryNano,
 			expectedLog: `
-==> wasi_snapshot_preview1.clock_res_get(id=1,result.resolution=16)
+==> wasi_snapshot_preview1.clock_res_get(id=monotonic)
-<== errno=ESUCCESS
+<== (resolution=1,errno=ESUCCESS)
 `,
 		},
 	}
@@ -85,8 +85,8 @@ func Test_clockResGet_Unsupported(t *testing.T) {
 			clockID:       2,
 			expectedErrno: ErrnoInval,
 			expectedLog: `
-==> wasi_snapshot_preview1.clock_res_get(id=2,result.resolution=16)
+==> wasi_snapshot_preview1.clock_res_get(id=2)
-<== errno=EINVAL
+<== (resolution=,errno=EINVAL)
 `,
 		},
 		{
@@ -94,8 +94,8 @@ func Test_clockResGet_Unsupported(t *testing.T) {
 			clockID:       3,
 			expectedErrno: ErrnoInval,
 			expectedLog: `
-==> wasi_snapshot_preview1.clock_res_get(id=3,result.resolution=16)
+==> wasi_snapshot_preview1.clock_res_get(id=3)
-<== errno=EINVAL
+<== (resolution=,errno=EINVAL)
 `,
 		},
 		{
@@ -103,12 +103,11 @@ func Test_clockResGet_Unsupported(t *testing.T) {
 			clockID:       100,
 			expectedErrno: ErrnoInval,
 			expectedLog: `
-==> wasi_snapshot_preview1.clock_res_get(id=100,result.resolution=16)
+==> wasi_snapshot_preview1.clock_res_get(id=100)
-<== errno=EINVAL
+<== (resolution=,errno=EINVAL)
 `,
 		},
 	}
-
 	for _, tt := range tests {
 		tc := tt
 
@@ -141,8 +140,8 @@ func Test_clockTimeGet(t *testing.T) {
 				'?', // stopped after encoding
 			},
 			expectedLog: `
-==> wasi_snapshot_preview1.clock_time_get(id=0,precision=0,result.timestamp=16)
+==> wasi_snapshot_preview1.clock_time_get(id=realtime,precision=0)
-<== errno=ESUCCESS
+<== (timestamp=1640995200000000000,errno=ESUCCESS)
 `,
 		},
 		{
@@ -154,8 +153,8 @@ func Test_clockTimeGet(t *testing.T) {
 				'?', // stopped after encoding
 			},
 			expectedLog: `
-==> wasi_snapshot_preview1.clock_time_get(id=1,precision=0,result.timestamp=16)
+==> wasi_snapshot_preview1.clock_time_get(id=monotonic,precision=0)
-<== errno=ESUCCESS
+<== (timestamp=0,errno=ESUCCESS)
 `,
 		},
 	}
@@ -193,8 +192,8 @@ func Test_clockTimeGet_Unsupported(t *testing.T) {
 			clockID:       2,
 			expectedErrno: ErrnoInval,
 			expectedLog: `
-==> wasi_snapshot_preview1.clock_time_get(id=2,precision=0,result.timestamp=16)
+==> wasi_snapshot_preview1.clock_time_get(id=2,precision=0)
-<== errno=EINVAL
+<== (timestamp=,errno=EINVAL)
 `,
 		},
 		{
@@ -202,8 +201,8 @@ func Test_clockTimeGet_Unsupported(t *testing.T) {
 			clockID:       3,
 			expectedErrno: ErrnoInval,
 			expectedLog: `
-==> wasi_snapshot_preview1.clock_time_get(id=3,precision=0,result.timestamp=16)
+==> wasi_snapshot_preview1.clock_time_get(id=3,precision=0)
-<== errno=EINVAL
+<== (timestamp=,errno=EINVAL)
 `,
 		},
 		{
@@ -211,8 +210,8 @@ func Test_clockTimeGet_Unsupported(t *testing.T) {
 			clockID:       100,
 			expectedErrno: ErrnoInval,
 			expectedLog: `
-==> wasi_snapshot_preview1.clock_time_get(id=100,precision=0,result.timestamp=16)
+==> wasi_snapshot_preview1.clock_time_get(id=100,precision=0)
-<== errno=EINVAL
+<== (timestamp=,errno=EINVAL)
 `,
 		},
 	}
@@ -245,16 +244,16 @@ func Test_clockTimeGet_Errors(t *testing.T) {
 			name:            "resultTimestamp OOM",
 			resultTimestamp: memorySize,
 			expectedLog: `
-==> wasi_snapshot_preview1.clock_time_get(id=0,precision=0,result.timestamp=65536)
+==> wasi_snapshot_preview1.clock_time_get(id=realtime,precision=0)
-<== errno=EFAULT
+<== (timestamp=,errno=EFAULT)
 `,
 		},
 		{
 			name:            "resultTimestamp exceeds the maximum valid address by 1",
 			resultTimestamp: memorySize - 4 + 1, // 4 is the size of uint32, the type of the count of args
 			expectedLog: `
-==> wasi_snapshot_preview1.clock_time_get(id=0,precision=0,result.timestamp=65533)
+==> wasi_snapshot_preview1.clock_time_get(id=realtime,precision=0)
-<== errno=EFAULT
+<== (timestamp=,errno=EFAULT)
 `,
 		},
 	}

internal/gojs/crypto_test.go

@@ -25,21 +25,10 @@ func Test_crypto(t *testing.T) {
 	require.Equal(t, `7a0c9f9f0d
 `, stdout)
 
-	// TODO: Go 1.17 initializes randoms in a different order than Go 1.18,19
+	// Search for the two functions that should be in scope, flexibly, to pass
-	// When we move to 1.20, remove the workaround.
+	// go 1.17-19
-	if log.String() != `==> go.runtime.getRandomData(r_len=32)
+	require.Contains(t, log.String(), `go.runtime.getRandomData(r_len=32)
-<==
+<==`)
-==> go.runtime.getRandomData(r_len=8)
+	require.Contains(t, log.String(), `==> go.syscall/js.valueCall(crypto.getRandomValues(r_len=5))
-<==
+<== (n=5)`)
-==> go.syscall/js.valueCall(crypto.getRandomValues(r_len=5))
-<== (n=5)
-` {
-		require.Equal(t, `==> go.runtime.getRandomData(r_len=8)
-<==
-==> go.runtime.getRandomData(r_len=32)
-<==
-==> go.syscall/js.valueCall(crypto.getRandomValues(r_len=5))
-<== (n=5)
-`, log.String())
-	}
 }

internal/gojs/custom/date.go

@@ -0,0 +1,17 @@
+package custom
+
+const (
+	NameDate                  = "Date"
+	NameDateGetTimezoneOffset = "getTimezoneOffset"
+)
+
+// DateNameSection are the functions defined in the object named NameDate.
+// Results here are those set to the current event object, but effectively are
+// results of the host function.
+var DateNameSection = map[string]*Names{
+	NameDateGetTimezoneOffset: {
+		Name:        NameDateGetTimezoneOffset,
+		ParamNames:  []string{},
+		ResultNames: []string{"tz"},
+	},
+}

internal/gojs/custom/names.go

@@ -190,5 +190,6 @@ var NameSection = map[string]*Names{
 
 var NameSectionSyscallValueCall = map[string]map[string]*Names{
 	NameCrypto: CryptoNameSection,
+	NameDate:   DateNameSection,
 	NameFs:     FsNameSection,
 }

internal/gojs/logging/logging.go

@@ -18,11 +18,11 @@ import (
 
 // IsInLogScope returns true if the current function is in any of the scopes.
 func IsInLogScope(fnd api.FunctionDefinition, scopes logging.LogScopes) bool {
-	if scopes.IsEnabled(logging.LogScopeRandom) {
+	if scopes.IsEnabled(logging.LogScopeClock) {
 		switch fnd.Name() {
-		case custom.NameRuntimeGetRandomData:
+		case custom.NameRuntimeNanotime1, custom.NameRuntimeWalltime:
 			return true
-		case custom.NameSyscallValueCall: // e.g. crypto.getRandomValues
+		case custom.NameSyscallValueCall: // e.g. Date.getTimezoneOffset
 			return true
 		}
 	}
@@ -33,6 +33,15 @@ func IsInLogScope(fnd api.FunctionDefinition, scopes logging.LogScopes) bool {
 		}
 	}
 
+	if scopes.IsEnabled(logging.LogScopeRandom) {
+		switch fnd.Name() {
+		case custom.NameRuntimeGetRandomData:
+			return true
+		case custom.NameSyscallValueCall: // e.g. crypto.getRandomValues
+			return true
+		}
+	}
+
 	return scopes == logging.LogScopeAll
 }
 
@@ -44,14 +53,20 @@ func Config(fnd api.FunctionDefinition, scopes logging.LogScopes) (pSampler logg
 		pLoggers = []logging.ParamLogger{syscallValueCallParamLogger}
 		rLoggers = []logging.ResultLogger{syscallValueCallResultLogger}
 	case custom.NameRuntimeGetRandomData:
-		_, rLoggers = logging.Config(fnd)
+		pLoggers = []logging.ParamLogger{runtimeGetRandomDataParamLogger}
-		pLoggers = []logging.ParamLogger{syscallGetRandomParamLogger}
+		// no results
+	case custom.NameRuntimeNanotime1:
+		// no params
+		rLoggers = []logging.ResultLogger{runtimeNanotime1ResultLogger}
+	case custom.NameRuntimeWalltime:
+		// no params
+		rLoggers = []logging.ResultLogger{runtimeWalltimeResultLogger}
 	default: // TODO: make generic logger for gojs
 	}
 	return
 }
 
-func syscallGetRandomParamLogger(_ context.Context, mod api.Module, w logging.Writer, params []uint64) {
+func runtimeGetRandomDataParamLogger(_ context.Context, mod api.Module, w logging.Writer, params []uint64) {
 	funcName := custom.NameRuntimeGetRandomData
 	paramNames := custom.NameSection[funcName].ParamNames
 	paramIdx := 1 /* there are two params, only write the length */
@@ -62,6 +77,28 @@ func syscallGetRandomParamLogger(_ context.Context, mod api.Module, w logging.Wr
 	writeI32(w, stack.ParamUint32(paramIdx))
 }
 
+func runtimeNanotime1ResultLogger(_ context.Context, mod api.Module, w logging.Writer, params, _ []uint64) {
+	writeResults(w, custom.NameRuntimeNanotime1, mod, params, 0)
+}
+
+func runtimeWalltimeResultLogger(_ context.Context, mod api.Module, w logging.Writer, params, _ []uint64) {
+	writeResults(w, custom.NameRuntimeWalltime, mod, params, 0)
+}
+
+func writeResults(w logging.Writer, funcName string, mod api.Module, params []uint64, resultOffset int) {
+	stack := goos.NewStack(funcName, mod.Memory(), uint32(params[0]))
+
+	resultNames := custom.NameSection[funcName].ResultNames
+	results := make([]interface{}, len(resultNames))
+	for i := range resultNames {
+		results[i] = stack.ParamUint32(i + resultOffset)
+	}
+
+	w.WriteByte('(') //nolint
+	writeVals(w, resultNames, results)
+	w.WriteByte(')') //nolint
+}
+
 type syscallValueCallParamSampler struct {
 	scopes logging.LogScopes
 }
@@ -70,6 +107,10 @@ func (s *syscallValueCallParamSampler) isSampled(ctx context.Context, mod api.Mo
 	vRef, m, args := syscallValueCallParams(ctx, mod, params)
 
 	switch vRef {
+	case goos.RefJsCrypto:
+		return logging.LogScopeRandom.IsEnabled(s.scopes)
+	case goos.RefJsDate:
+		return logging.LogScopeClock.IsEnabled(s.scopes)
 	case goos.RefJsfs:
 		if !logging.LogScopeFilesystem.IsEnabled(s.scopes) {
 			return false
@@ -81,8 +122,6 @@ func (s *syscallValueCallParamSampler) isSampled(ctx context.Context, mod api.Mo
 			return fd > sys.FdStderr
 		}
 		return true
-	case goos.RefJsCrypto:
-		return logging.LogScopeRandom.IsEnabled(s.scopes)
 	}
 
 	return s.scopes == logging.LogScopeAll
@@ -94,6 +133,8 @@ func syscallValueCallParamLogger(ctx context.Context, mod api.Module, w logging.
 	switch vRef {
 	case goos.RefJsCrypto:
 		logSyscallValueCallArgs(w, custom.NameCrypto, m, args)
+	case goos.RefJsDate:
+		logSyscallValueCallArgs(w, custom.NameDate, m, args)
 	case goos.RefJsfs:
 		logFsParams(m, w, args)
 	default:
@@ -151,6 +192,10 @@ func syscallValueCallResultLogger(ctx context.Context, mod api.Module, w logging
 		resultNames = custom.CryptoNameSection[m].ResultNames
 		rRef := stack.ParamVal(ctx, 6, gojs.LoadValue) // val is after padding
 		resultVals = []interface{}{rRef}
+	case goos.RefJsDate:
+		resultNames = custom.DateNameSection[m].ResultNames
+		rRef := stack.ParamVal(ctx, 6, gojs.LoadValue) // val is after padding
+		resultVals = []interface{}{rRef}
 	case goos.RefJsfs:
 		resultNames = custom.FsNameSection[m].ResultNames
 		resultVals = gojs.GetLastEventArgs(ctx)

internal/gojs/time.go

@@ -4,6 +4,7 @@ import (
 	"context"
 
 	"github.com/tetratelabs/wazero/api"
+	"github.com/tetratelabs/wazero/internal/gojs/custom"
 	"github.com/tetratelabs/wazero/internal/gojs/goos"
 )
 
@@ -11,12 +12,12 @@ var (
 	// jsDateConstructor returns jsDate.
 	//
 	// This is defined as `Get("Date")` in zoneinfo_js.go time.initLocal
-	jsDateConstructor = newJsVal(goos.RefJsDateConstructor, "Date")
+	jsDateConstructor = newJsVal(goos.RefJsDateConstructor, custom.NameDate)
 
 	// jsDate is used inline in zoneinfo_js.go for time.initLocal.
 	// `.Call("getTimezoneOffset").Int()` returns a timezone offset.
-	jsDate = newJsVal(goos.RefJsDate, "jsDate").
+	jsDate = newJsVal(goos.RefJsDate, custom.NameDate).
-		addFunction("getTimezoneOffset", jsDateGetTimezoneOffset{})
+		addFunction(custom.NameDateGetTimezoneOffset, jsDateGetTimezoneOffset{})
 )
 
 // jsDateGetTimezoneOffset implements jsFn

internal/gojs/time_test.go

@@ -1,20 +1,39 @@
 package gojs_test
 
 import (
+	"bytes"
+	"context"
 	"testing"
 
 	"github.com/tetratelabs/wazero"
+	"github.com/tetratelabs/wazero/experimental"
+	"github.com/tetratelabs/wazero/experimental/logging"
 	"github.com/tetratelabs/wazero/internal/testing/require"
 )
 
 func Test_time(t *testing.T) {
 	t.Parallel()
 
-	stdout, stderr, err := compileAndRun(testCtx, "time", wazero.NewModuleConfig())
+	var log bytes.Buffer
+	loggingCtx := context.WithValue(testCtx, experimental.FunctionListenerFactoryKey{},
+		logging.NewHostLoggingListenerFactory(&log, logging.LogScopeClock))
+
+	stdout, stderr, err := compileAndRun(loggingCtx, "time", wazero.NewModuleConfig())
 
 	require.EqualError(t, err, `module "" closed with exit_code(0)`)
 	require.Zero(t, stderr)
 	require.Equal(t, `Local
 1ms
 `, stdout)
+
+	// Search for the three functions that should be in scope, flexibly, to pass
+	// go 1.17-19
+	require.Contains(t, log.String(), `==> go.runtime.nanotime1()
+<== (nsec=0)`)
+	require.Contains(t, log.String(), `==> go.runtime.walltime()
+<== (sec=1640995200,nsec=0)
+`)
+	require.Contains(t, log.String(), `==> go.syscall/js.valueCall(Date.getTimezoneOffset())
+<== (tz=0)
+`)
 }

internal/logging/logging.go

@@ -37,14 +37,17 @@ const (
 type LogScopes uint64
 
 const (
-	LogScopeNone                 = LogScopes(0)
+	LogScopeNone            = LogScopes(0)
-	LogScopeFilesystem LogScopes = 1 << iota
+	LogScopeClock LogScopes = 1 << iota
+	LogScopeFilesystem
 	LogScopeRandom
 	LogScopeAll = LogScopes(0xffffffffffffffff)
 )
 
 func scopeName(s LogScopes) string {
 	switch s {
+	case LogScopeClock:
+		return "clock"
 	case LogScopeFilesystem:
 		return "filesystem"
 	case LogScopeRandom:

internal/logging/logging_test.go

@@ -51,10 +51,11 @@ func TestLogScopes_String(t *testing.T) {
 	}{
 		{name: "none", scopes: LogScopeNone, expected: ""},
 		{name: "any", scopes: LogScopeAll, expected: "all"},
+		{name: "clock", scopes: LogScopeClock, expected: "clock"},
 		{name: "filesystem", scopes: LogScopeFilesystem, expected: "filesystem"},
 		{name: "random", scopes: LogScopeRandom, expected: "random"},
 		{name: "filesystem|random", scopes: LogScopeFilesystem | LogScopeRandom, expected: "filesystem|random"},
-		{name: "undefined", scopes: 1 << 3, expected: fmt.Sprintf("<unknown=%d>", (1 << 3))},
+		{name: "undefined", scopes: 1 << 14, expected: fmt.Sprintf("<unknown=%d>", 1<<14)},
 	}
 
 	for _, tt := range tests {

internal/wasi_snapshot_preview1/logging/logging.go

@@ -14,6 +14,10 @@ import (
 
 var le = binary.LittleEndian
 
+func isClockFunction(fnd api.FunctionDefinition) bool {
+	return strings.HasPrefix(fnd.Name(), "clock_")
+}
+
 func isFilesystemFunction(fnd api.FunctionDefinition) bool {
 	switch {
 	case strings.HasPrefix(fnd.Name(), "path_"):
@@ -30,8 +34,8 @@ func isRandomFunction(fnd api.FunctionDefinition) bool {
 
 // IsInLogScope returns true if the current function is in any of the scopes.
 func IsInLogScope(fnd api.FunctionDefinition, scopes logging.LogScopes) bool {
-	if scopes.IsEnabled(logging.LogScopeRandom) {
+	if scopes.IsEnabled(logging.LogScopeClock) {
-		if isRandomFunction(fnd) {
+		if isClockFunction(fnd) {
 			return true
 		}
 	}
@@ -42,6 +46,12 @@ func IsInLogScope(fnd api.FunctionDefinition, scopes logging.LogScopes) bool {
 		}
 	}
 
+	if scopes.IsEnabled(logging.LogScopeRandom) {
+		if isRandomFunction(fnd) {
+			return true
+		}
+	}
+
 	return scopes == logging.LogScopeAll
 }
 
@@ -83,6 +93,26 @@ func Config(fnd api.FunctionDefinition) (pSampler logging.ParamSampler, pLoggers
 			continue
 		}
 
+		if strings.HasPrefix(fnd.Name(), "clock_") {
+			switch name {
+			case "id":
+				logger = logClockId(idx).Log
+				pLoggers = append(pLoggers, logger)
+			case "result.resolution":
+				name = resultParamName(name)
+				logger = logMemI32(idx).Log
+				rLoggers = append(rLoggers, resultParamLogger(name, logger))
+			case "result.timestamp":
+				name = resultParamName(name)
+				logger = logMemI64(idx).Log
+				rLoggers = append(rLoggers, resultParamLogger(name, logger))
+			default:
+				logger = logging.NewParamLogger(idx, name, fnd.ParamTypes()[idx])
+				pLoggers = append(pLoggers, logger)
+			}
+			continue
+		}
+
 		switch name {
 		case "fdflags":
 			logger = logFdflags(idx).Log
@@ -149,6 +179,14 @@ func (i logMemI32) Log(_ context.Context, mod api.Module, w logging.Writer, para
 	}
 }
 
+type logMemI64 uint32
+
+func (i logMemI64) Log(_ context.Context, mod api.Module, w logging.Writer, params []uint64) {
+	if v, ok := mod.Memory().ReadUint64Le(uint32(params[i])); ok {
+		writeI64(w, v)
+	}
+}
+
 type logFilestat uint32
 
 func (i logFilestat) Log(_ context.Context, mod api.Module, w logging.Writer, params []uint64) {
@@ -214,6 +252,21 @@ func resultParamLogger(name string, pLogger logging.ParamLogger) logging.ResultL
 	}
 }
 
+type logClockId int
+
+func (i logClockId) Log(_ context.Context, _ api.Module, w logging.Writer, params []uint64) {
+	id := uint32(params[i])
+	w.WriteString("id=") //nolint
+	switch id {
+	case ClockIDRealtime:
+		w.WriteString("realtime") //nolint
+	case ClockIDMonotonic:
+		w.WriteString("monotonic") //nolint
+	default:
+		writeI32(w, id)
+	}
+}
+
 type logFdflags int
 
 func (i logFdflags) Log(_ context.Context, _ api.Module, w logging.Writer, params []uint64) {

internal/wasi_snapshot_preview1/logging/logging_test.go

@@ -21,8 +21,9 @@ func (f *testFunctionDefinition) Name() string {
 }
 
 func TestIsInLogScope(t *testing.T) {
-	randomGet := &testFunctionDefinition{name: RandomGetName}
+	clockTimeGet := &testFunctionDefinition{name: ClockTimeGetName}
 	fdRead := &testFunctionDefinition{name: FdReadName}
+	randomGet := &testFunctionDefinition{name: RandomGetName}
 	tests := []struct {
 		name     string
 		fnd      api.FunctionDefinition
@@ -30,32 +31,32 @@ func TestIsInLogScope(t *testing.T) {
 		expected bool
 	}{
 		{
-			name:     "randomGet in LogScopeRandom",
+			name:     "clockTimeGet in LogScopeClock",
-			fnd:      randomGet,
+			fnd:      clockTimeGet,
-			scopes:   logging.LogScopeRandom,
+			scopes:   logging.LogScopeClock,
 			expected: true,
 		},
 		{
-			name:     "randomGet not in LogScopeFilesystem",
+			name:     "clockTimeGet not in LogScopeFilesystem",
-			fnd:      randomGet,
+			fnd:      clockTimeGet,
 			scopes:   logging.LogScopeFilesystem,
 			expected: false,
 		},
 		{
-			name:     "randomGet in LogScopeRandom|LogScopeFilesystem",
+			name:     "clockTimeGet in LogScopeClock|LogScopeFilesystem",
-			fnd:      randomGet,
+			fnd:      clockTimeGet,
-			scopes:   logging.LogScopeRandom | logging.LogScopeFilesystem,
+			scopes:   logging.LogScopeClock | logging.LogScopeFilesystem,
 			expected: true,
 		},
 		{
-			name:     "randomGet in LogScopeAll",
+			name:     "clockTimeGet in LogScopeAll",
-			fnd:      randomGet,
+			fnd:      clockTimeGet,
 			scopes:   logging.LogScopeAll,
 			expected: true,
 		},
 		{
-			name:     "randomGet not in LogScopeNone",
+			name:     "clockTimeGet not in LogScopeNone",
-			fnd:      randomGet,
+			fnd:      clockTimeGet,
 			scopes:   logging.LogScopeNone,
 			expected: false,
 		},
@@ -89,6 +90,36 @@ func TestIsInLogScope(t *testing.T) {
 			scopes:   logging.LogScopeNone,
 			expected: false,
 		},
+		{
+			name:     "randomGet in LogScopeRandom",
+			fnd:      randomGet,
+			scopes:   logging.LogScopeRandom,
+			expected: true,
+		},
+		{
+			name:     "randomGet not in LogScopeFilesystem",
+			fnd:      randomGet,
+			scopes:   logging.LogScopeFilesystem,
+			expected: false,
+		},
+		{
+			name:     "randomGet in LogScopeRandom|LogScopeFilesystem",
+			fnd:      randomGet,
+			scopes:   logging.LogScopeRandom | logging.LogScopeFilesystem,
+			expected: true,
+		},
+		{
+			name:     "randomGet in LogScopeAll",
+			fnd:      randomGet,
+			scopes:   logging.LogScopeAll,
+			expected: true,
+		},
+		{
+			name:     "randomGet not in LogScopeNone",
+			fnd:      randomGet,
+			scopes:   logging.LogScopeNone,
+			expected: false,
+		},
 	}
 
 	for _, tt := range tests {