/
zapcore_handler.go
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/
zapcore_handler.go
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// Copyright Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package log
import (
"fmt"
"runtime"
"strings"
"time"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"istio.io/pkg/structured"
)
var (
toLevel = map[zapcore.Level]Level{
zapcore.FatalLevel: FatalLevel,
zapcore.ErrorLevel: ErrorLevel,
zapcore.WarnLevel: WarnLevel,
zapcore.InfoLevel: InfoLevel,
zapcore.DebugLevel: DebugLevel,
}
toZapLevel = map[Level]zapcore.Level{
FatalLevel: zapcore.FatalLevel,
ErrorLevel: zapcore.ErrorLevel,
WarnLevel: zapcore.WarnLevel,
InfoLevel: zapcore.InfoLevel,
DebugLevel: zapcore.DebugLevel,
}
)
func init() {
registerDefaultHandler(ZapLogHandlerCallbackFunc)
}
// ZapLogHandlerCallbackFunc is the handler function that emulates the previous Istio logging output and adds
// support for errdict package and labels logging.
func ZapLogHandlerCallbackFunc(
level Level,
scope *Scope,
ie *structured.Error,
msg string,
) {
var fields []zapcore.Field
if useJSON.Load().(bool) {
if ie != nil {
fields = appendNotEmptyField(fields, "message", msg)
// Unlike zap, don't leave the message in CLI format.
msg = ""
fields = appendNotEmptyField(fields, "moreInfo", ie.MoreInfo)
fields = appendNotEmptyField(fields, "impact", ie.Impact)
fields = appendNotEmptyField(fields, "action", ie.Action)
fields = appendNotEmptyField(fields, "likelyCause", ie.LikelyCause)
fields = appendNotEmptyField(fields, "err", toErrString(ie.Err))
}
for _, k := range scope.labelKeys {
v := scope.labels[k]
fields = append(fields, zap.Field{
Key: k,
Type: zapcore.ReflectType,
Interface: v,
})
}
} else {
sb := &strings.Builder{}
sb.WriteString(msg)
if ie != nil || len(scope.labelKeys) > 0 {
sb.WriteString("\t")
}
if ie != nil {
appendNotEmptyString(sb, "moreInfo", ie.MoreInfo)
appendNotEmptyString(sb, "impact", ie.Impact)
appendNotEmptyString(sb, "action", ie.Action)
appendNotEmptyString(sb, "likelyCause", ie.LikelyCause)
appendNotEmptyString(sb, "err", toErrString(ie.Err))
}
space := false
for _, k := range scope.labelKeys {
if space {
sb.WriteString(" ")
}
sb.WriteString(fmt.Sprintf("%s=%v", k, scope.labels[k]))
space = true
}
msg = sb.String()
}
emit(scope, toZapLevel[level], msg, fields)
}
// appendNotEmptyField appends a field with key:value to fields. If value is empty, it does nothing.
func appendNotEmptyField(fields []zapcore.Field, key, value string) []zapcore.Field {
if key == "" || value == "" {
return fields
}
return append(fields, zap.String(key, value))
}
// appendNotEmptyString appends a key=value string to sb. If value is empty, it does nothing.
func appendNotEmptyString(sb *strings.Builder, key, value string) {
if key == "" || value == "" {
return
}
sb.WriteString(fmt.Sprintf("%s=%v ", key, value))
}
// callerSkipOffset is how many callers to pop off the stack to determine the caller function locality, used for
// adding file/line number to log output.
const callerSkipOffset = 4
func dumpStack(level zapcore.Level, scope *Scope) bool {
thresh := toLevel[level]
if scope != defaultScope {
thresh = ErrorLevel
switch level {
case zapcore.FatalLevel:
thresh = FatalLevel
}
}
return scope.GetStackTraceLevel() >= thresh
}
func emit(scope *Scope, level zapcore.Level, msg string, fields []zapcore.Field) {
e := zapcore.Entry{
Message: msg,
Level: level,
Time: time.Now(),
LoggerName: scope.nameToEmit,
}
if scope.GetLogCallers() {
e.Caller = zapcore.NewEntryCaller(runtime.Caller(scope.callerSkip + callerSkipOffset))
}
if dumpStack(level, scope) {
e.Stack = zap.Stack("").String
}
pt := funcs.Load().(patchTable)
if pt.write != nil {
if err := pt.write(e, fields); err != nil {
_, _ = fmt.Fprintf(pt.errorSink, "%v log write error: %v\n", time.Now(), err)
_ = pt.errorSink.Sync()
}
}
}
// toErrString returns the string representation of err, handling the nil case.
func toErrString(err error) string {
if err == nil {
return ""
}
return err.Error()
}