67125fcaa4
This allows rewinding a directory by specifying the cookie 0, after already scrolling a directory. This allows zig and clang functionality to work which expect this. This also fixes the case where a directory was allowed to be seeked. This is prohibited by the current version of wasi-testsuite. Signed-off-by: Adrian Cole <adrian@tetrate.io> Co-authored-by: Takeshi Yoneda <takeshi@tetrate.io>
347 lines
9.8 KiB
Go
347 lines
9.8 KiB
Go
package logging
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import (
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"context"
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"encoding/binary"
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"strconv"
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"strings"
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"github.com/tetratelabs/wazero/api"
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"github.com/tetratelabs/wazero/internal/logging"
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"github.com/tetratelabs/wazero/internal/sys"
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. "github.com/tetratelabs/wazero/internal/wasi_snapshot_preview1"
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)
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var le = binary.LittleEndian
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func isClockFunction(fnd api.FunctionDefinition) bool {
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return strings.HasPrefix(fnd.Name(), "clock_")
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}
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func isExitFunction(fnd api.FunctionDefinition) bool {
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return fnd.Name() == ProcExitName
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}
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func isFilesystemFunction(fnd api.FunctionDefinition) bool {
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switch {
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case strings.HasPrefix(fnd.Name(), "path_"):
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return true
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case strings.HasPrefix(fnd.Name(), "fd_"):
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return true
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}
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return false
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}
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func isPollFunction(fnd api.FunctionDefinition) bool {
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return fnd.Name() == PollOneoffName
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}
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func isRandomFunction(fnd api.FunctionDefinition) bool {
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return fnd.Name() == RandomGetName
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}
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// IsInLogScope returns true if the current function is in any of the scopes.
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func IsInLogScope(fnd api.FunctionDefinition, scopes logging.LogScopes) bool {
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if scopes.IsEnabled(logging.LogScopeClock) {
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if isClockFunction(fnd) {
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return true
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}
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}
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if scopes.IsEnabled(logging.LogScopeExit) {
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if isExitFunction(fnd) {
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return true
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}
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}
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if scopes.IsEnabled(logging.LogScopeFilesystem) {
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if isFilesystemFunction(fnd) {
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return true
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}
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}
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if scopes.IsEnabled(logging.LogScopePoll) {
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if isPollFunction(fnd) {
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return true
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}
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}
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if scopes.IsEnabled(logging.LogScopeRandom) {
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if isRandomFunction(fnd) {
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return true
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}
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}
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return scopes == logging.LogScopeAll
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}
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func Config(fnd api.FunctionDefinition) (pSampler logging.ParamSampler, pLoggers []logging.ParamLogger, rLoggers []logging.ResultLogger) {
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types := fnd.ParamTypes()
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names := fnd.ParamNames()
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switch fnd.Name() {
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case FdPrestatGetName:
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pLoggers = []logging.ParamLogger{logging.NewParamLogger(0, "fd", logging.ValueTypeI32)}
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rLoggers = []logging.ResultLogger{resultParamLogger("prestat", logPrestat(1).Log), logErrno}
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return
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case ProcExitName:
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pLoggers, rLoggers = logging.Config(fnd)
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return
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case FdReadName, FdWriteName:
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pSampler = fdReadWriteSampler
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}
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for idx := uint32(0); idx < uint32(len(types)); idx++ {
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name := names[idx]
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var logger logging.ParamLogger
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if isLookupFlags(fnd, name) {
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logger = (&logLookupflags{name, idx}).Log
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pLoggers = append(pLoggers, logger)
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continue
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}
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isResult := strings.HasPrefix(name, "result.")
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if strings.Contains(name, "path") {
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if isResult {
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name = resultParamName(name)
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logger = logString(idx).Log
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rLoggers = append(rLoggers, resultParamLogger(name, logger))
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} else {
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logger = logging.NewParamLogger(idx, name, logging.ValueTypeString)
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pLoggers = append(pLoggers, logger)
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}
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idx++
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continue
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}
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if strings.HasPrefix(fnd.Name(), "clock_") {
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switch name {
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case "id":
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logger = logClockId(idx).Log
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pLoggers = append(pLoggers, logger)
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case "result.resolution":
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name = resultParamName(name)
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logger = logMemI32(idx).Log
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rLoggers = append(rLoggers, resultParamLogger(name, logger))
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case "result.timestamp":
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name = resultParamName(name)
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logger = logMemI64(idx).Log
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rLoggers = append(rLoggers, resultParamLogger(name, logger))
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default:
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logger = logging.NewParamLogger(idx, name, types[idx])
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pLoggers = append(pLoggers, logger)
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}
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continue
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}
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switch name {
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case "fdflags":
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logger = logFdflags(idx).Log
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case "oflags":
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logger = logOflags(idx).Log
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case "fs_rights_base":
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logger = logFsRightsBase(idx).Log
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case "fs_rights_inheriting":
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logger = logFsRightsInheriting(idx).Log
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case "result.nread", "result.nwritten", "result.opened_fd", "result.nevents":
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name = resultParamName(name)
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logger = logMemI32(idx).Log
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rLoggers = append(rLoggers, resultParamLogger(name, logger))
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continue
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case "result.newoffset":
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name = resultParamName(name)
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logger = logMemI64(idx).Log
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rLoggers = append(rLoggers, resultParamLogger(name, logger))
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case "result.filestat":
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name = resultParamName(name)
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logger = logFilestat(idx).Log
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rLoggers = append(rLoggers, resultParamLogger(name, logger))
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continue
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case "result.stat":
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name = resultParamName(name)
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logger = logFdstat(idx).Log
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rLoggers = append(rLoggers, resultParamLogger(name, logger))
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continue
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default:
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logger = logging.NewParamLogger(idx, name, types[idx])
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}
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pLoggers = append(pLoggers, logger)
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}
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// All WASI functions except proc_after return only an logErrno result.
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rLoggers = append(rLoggers, logErrno)
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return
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}
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// Ensure we don't clutter log with reads and writes to stdio.
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func fdReadWriteSampler(_ context.Context, _ api.Module, params []uint64) bool {
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fd := uint32(params[0])
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return fd > sys.FdStderr
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}
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func isLookupFlags(fnd api.FunctionDefinition, name string) bool {
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switch fnd.Name() {
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case PathFilestatGetName, PathFilestatSetTimesName:
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return name == "flags"
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case PathLinkName:
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return name == "old_flags"
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case PathOpenName:
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return name == "dirflags"
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}
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return false
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}
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func logErrno(_ context.Context, _ api.Module, w logging.Writer, _, results []uint64) {
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errno := ErrnoName(uint32(results[0]))
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w.WriteString("errno=") //nolint
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w.WriteString(errno) //nolint
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}
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type logMemI32 uint32
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func (i logMemI32) Log(_ context.Context, mod api.Module, w logging.Writer, params []uint64) {
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if v, ok := mod.Memory().ReadUint32Le(uint32(params[i])); ok {
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writeI32(w, v)
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}
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}
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type logMemI64 uint32
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func (i logMemI64) Log(_ context.Context, mod api.Module, w logging.Writer, params []uint64) {
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if v, ok := mod.Memory().ReadUint64Le(uint32(params[i])); ok {
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writeI64(w, v)
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}
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}
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type logFilestat uint32
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func (i logFilestat) Log(_ context.Context, mod api.Module, w logging.Writer, params []uint64) {
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offset, byteCount := uint32(params[i]), uint32(64)
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if buf, ok := mod.Memory().Read(offset, byteCount); ok {
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w.WriteString("{filetype=") //nolint
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w.WriteString(FiletypeName(buf[16])) //nolint
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w.WriteString(",size=") //nolint
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writeI64(w, le.Uint64(buf[32:]))
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w.WriteString(",mtim=") //nolint
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writeI64(w, le.Uint64(buf[48:]))
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w.WriteString("}") //nolint
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}
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}
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type logFdstat uint32
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func (i logFdstat) Log(_ context.Context, mod api.Module, w logging.Writer, params []uint64) {
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offset, byteCount := uint32(params[i]), uint32(24)
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if buf, ok := mod.Memory().Read(offset, byteCount); ok {
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w.WriteString("{filetype=") //nolint
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w.WriteString(FiletypeName(buf[0])) //nolint
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w.WriteString(",fdflags=") //nolint
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w.WriteString(FdFlagsString(int(le.Uint16(buf[2:])))) //nolint
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w.WriteString(",fs_rights_base=") //nolint
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w.WriteString(RightsString(int(le.Uint16(buf[8:])))) //nolint
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w.WriteString(",fs_rights_inheriting=") //nolint
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w.WriteString(RightsString(int(le.Uint16(buf[16:])))) //nolint
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w.WriteString("}") //nolint
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}
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}
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type logString uint32
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func (i logString) Log(_ context.Context, mod api.Module, w logging.Writer, params []uint64) {
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offset, byteCount := uint32(params[i]), uint32(params[i+1])
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if s, ok := mod.Memory().Read(offset, byteCount); ok {
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w.Write(s) //nolint
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}
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}
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type logPrestat uint32
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// Log writes the only valid field: pr_name_len
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// See https://github.com/WebAssembly/WASI/blob/snapshot-01/phases/snapshot/docs.md#prestat_dir
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func (i logPrestat) Log(_ context.Context, mod api.Module, w logging.Writer, params []uint64) {
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offset := uint32(params[i]) + 4 // skip to pre_name_len field
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if nameLen, ok := mod.Memory().ReadUint32Le(offset); ok {
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w.WriteString("{pr_name_len=") //nolint
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writeI32(w, nameLen)
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w.WriteString("}") //nolint
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}
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}
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// resultParamLogger logs the value of the parameter on ESUCCESS.
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func resultParamLogger(name string, pLogger logging.ParamLogger) logging.ResultLogger {
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prefix := name + "="
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return func(ctx context.Context, mod api.Module, w logging.Writer, params, results []uint64) {
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w.WriteString(prefix) //nolint
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if Errno(results[0]) == ErrnoSuccess {
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pLogger(ctx, mod, w, params)
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}
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}
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}
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type logClockId int
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func (i logClockId) Log(_ context.Context, _ api.Module, w logging.Writer, params []uint64) {
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id := uint32(params[i])
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w.WriteString("id=") //nolint
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switch id {
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case ClockIDRealtime:
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w.WriteString("realtime") //nolint
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case ClockIDMonotonic:
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w.WriteString("monotonic") //nolint
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default:
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writeI32(w, id)
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}
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}
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type logFdflags int
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func (i logFdflags) Log(_ context.Context, _ api.Module, w logging.Writer, params []uint64) {
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w.WriteString("fdflags=") //nolint
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w.WriteString(FdFlagsString(int(params[i]))) //nolint
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}
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type logLookupflags struct {
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name string
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i uint32
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}
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func (l *logLookupflags) Log(_ context.Context, _ api.Module, w logging.Writer, params []uint64) {
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w.WriteString(l.name) //nolint
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w.WriteByte('=') //nolint
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w.WriteString(LookupflagsString(int(params[l.i]))) //nolint
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}
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type logFsRightsBase uint32
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func (i logFsRightsBase) Log(_ context.Context, _ api.Module, w logging.Writer, params []uint64) {
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w.WriteString("fs_rights_base=") //nolint
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w.WriteString(RightsString(int(params[i]))) //nolint
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}
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type logFsRightsInheriting uint32
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func (i logFsRightsInheriting) Log(_ context.Context, _ api.Module, w logging.Writer, params []uint64) {
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w.WriteString("fs_rights_inheriting=") //nolint
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w.WriteString(RightsString(int(params[i]))) //nolint
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}
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type logOflags int
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func (i logOflags) Log(_ context.Context, _ api.Module, w logging.Writer, params []uint64) {
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w.WriteString("oflags=") //nolint
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w.WriteString(OflagsString(int(params[i]))) //nolint
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}
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func resultParamName(name string) string {
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return name[7:] // without "result."
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}
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func writeI32(w logging.Writer, v uint32) {
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w.WriteString(strconv.FormatInt(int64(int32(v)), 10)) //nolint
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}
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func writeI64(w logging.Writer, v uint64) {
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w.WriteString(strconv.FormatInt(int64(v), 10)) //nolint
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}
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