forked from grpc-ecosystem/go-grpc-middleware
/
context.go
65 lines (54 loc) · 1.46 KB
/
context.go
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package ctxlogrus
import (
"github.com/grpc-ecosystem/go-grpc-middleware/tags"
"github.com/sirupsen/logrus"
"golang.org/x/net/context"
)
type ctxLoggerMarker struct{}
type ctxLogger struct {
logger *logrus.Entry
fields logrus.Fields
}
var (
ctxLoggerKey = &ctxLoggerMarker{}
)
// AddFields adds logrus fields to the logger.
func AddFields(ctx context.Context, fields logrus.Fields) {
l, ok := ctx.Value(ctxLoggerKey).(*ctxLogger)
if !ok || l == nil {
return
}
for k, v := range fields {
l.fields[k] = v
}
}
// Extract takes the call-scoped logrus.Entry from ctx_logrus middleware.
//
// If the ctx_logrus middleware wasn't used, a no-op `logrus.Entry` is returned. This makes it safe to
// use regardless.
func Extract(ctx context.Context) *logrus.Entry {
l, ok := ctx.Value(ctxLoggerKey).(*ctxLogger)
if !ok || l == nil {
return logrus.NewEntry(nullLogger)
}
fields := logrus.Fields{}
// Add grpc_ctxtags tags metadata until now.
tags := grpc_ctxtags.Extract(ctx)
for k, v := range tags.Values() {
fields[k] = v
}
// Add logrus fields added until now.
for k, v := range l.fields {
fields[k] = v
}
return l.logger.WithFields(fields)
}
// ToContext adds the logrus.Entry to the context for extraction later.
// Returning the new context that has been created.
func ToContext(ctx context.Context, entry *logrus.Entry) context.Context {
l := &ctxLogger{
logger: entry,
fields: logrus.Fields{},
}
return context.WithValue(ctx, ctxLoggerKey, l)
}