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deferrer.go
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deferrer.go
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// Copyright 2023 LiveKit, Inc.
//
// 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 zaputil
import (
"sync"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
type deferredWrite struct {
core zapcore.Core
ent zapcore.Entry
fields []zapcore.Field
}
type Deferrer struct {
mu sync.Mutex
ready bool
fields []zapcore.Field
writes []*deferredWrite
}
func (b *Deferrer) buffer(core zapcore.Core, ent zapcore.Entry, fields []zapcore.Field) bool {
b.mu.Lock()
defer b.mu.Unlock()
if b.ready {
return false
}
b.writes = append(b.writes, &deferredWrite{core, ent, fields})
return true
}
func (b *Deferrer) flush() {
b.mu.Lock()
b.ready = true
writes := b.writes
b.writes = nil
b.mu.Unlock()
var fields []zapcore.Field
for _, w := range writes {
fields = append(fields[:0], b.fields...)
fields = append(fields, w.fields...)
w.core.Write(w.ent, fields)
}
}
func (b *Deferrer) write(core zapcore.Core, ent zapcore.Entry, fields []zapcore.Field) error {
if !b.buffer(core, ent, fields) {
return core.Write(ent, append(fields[0:len(fields):len(fields)], b.fields...))
}
return nil
}
type DeferredFieldResolver func(args ...any)
func NewDeferrer() (*Deferrer, DeferredFieldResolver) {
buf := &Deferrer{}
var resolveOnce sync.Once
resolve := func(args ...any) {
resolveOnce.Do(func() {
fields := make([]zapcore.Field, 0, len(args))
for i := 0; i < len(args); i++ {
switch arg := args[i].(type) {
case zapcore.Field:
fields = append(fields, arg)
case string:
if i < len(args)-1 {
fields = append(fields, zap.Any(arg, args[i+1]))
i++
}
}
}
buf.fields = fields
buf.flush()
})
}
return buf, resolve
}
type deferredValueCore struct {
zapcore.Core
def *Deferrer
}
func NewDeferredValueCore(core zapcore.Core, def *Deferrer) zapcore.Core {
def.mu.Lock()
defer def.mu.Unlock()
return &deferredValueCore{core, def}
}
func (c *deferredValueCore) With(fields []zapcore.Field) zapcore.Core {
return &deferredValueCore{
Core: c.Core.With(fields),
def: c.def,
}
}
func (c *deferredValueCore) Check(ent zapcore.Entry, ce *zapcore.CheckedEntry) *zapcore.CheckedEntry {
if c.Enabled(ent.Level) {
return ce.AddCore(ent, c)
}
return ce
}
func (c *deferredValueCore) Write(ent zapcore.Entry, fields []zapcore.Field) error {
return c.def.write(c.Core, ent, fields)
}