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100 lines
2.2 KiB
Go
100 lines
2.2 KiB
Go
// Package log implements API-related logging helpers.
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package log
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import (
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"context"
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"fmt"
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"net/http"
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"os"
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"github.com/pkg/errors"
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)
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type errorLoggerKey struct{}
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// ErrorLogger is the function type used to log errors.
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type ErrorLogger func(http.ResponseWriter, *http.Request, error)
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func (fn ErrorLogger) call(w http.ResponseWriter, r *http.Request, err error) {
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if fn == nil {
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return
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}
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fn(w, r, err)
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}
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// WithErrorLogger returns a new context with the given error logger.
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func WithErrorLogger(ctx context.Context, fn ErrorLogger) context.Context {
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return context.WithValue(ctx, errorLoggerKey{}, fn)
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}
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// ErrorLoggerFromContext returns an error logger from the context.
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func ErrorLoggerFromContext(ctx context.Context) (fn ErrorLogger) {
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fn, _ = ctx.Value(errorLoggerKey{}).(ErrorLogger)
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return
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}
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// StackTracedError is the set of errors implementing the StackTrace function.
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//
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// Errors implementing this interface have their stack traces logged when passed
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// to the Error function of this package.
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type StackTracedError interface {
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error
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StackTrace() errors.StackTrace
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}
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type fieldCarrier interface {
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WithFields(map[string]any)
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Fields() map[string]any
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}
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// Error adds to the response writer the given error if it implements
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// logging.ResponseLogger. If it does not implement it, then writes the error
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// using the log package.
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func Error(w http.ResponseWriter, r *http.Request, err error) {
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ErrorLoggerFromContext(r.Context()).call(w, r, err)
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fc, ok := w.(fieldCarrier)
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if !ok {
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return
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}
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fc.WithFields(map[string]any{
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"error": err,
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})
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if os.Getenv("STEPDEBUG") != "1" {
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return
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}
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var st StackTracedError
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if errors.As(err, &st) {
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fc.WithFields(map[string]any{
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"stack-trace": fmt.Sprintf("%+v", st.StackTrace()),
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})
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}
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}
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// EnabledResponse log the response object if it implements the EnableLogger
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// interface.
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func EnabledResponse(rw http.ResponseWriter, r *http.Request, v any) {
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type enableLogger interface {
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ToLog() (any, error)
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}
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if el, ok := v.(enableLogger); ok {
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out, err := el.ToLog()
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if err != nil {
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Error(rw, r, err)
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return
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}
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if rl, ok := rw.(fieldCarrier); ok {
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rl.WithFields(map[string]any{
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"response": out,
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})
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}
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}
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}
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