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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package zapcore
// Core is a minimal, fast logger interface. It's designed for library authors
// to wrap in a more user-friendly API.
type Core interface {
LevelEnabler
// With adds structured context to the Core.
With([]Field) Core
// Check determines whether the supplied Entry should be logged (using the
// embedded LevelEnabler and possibly some extra logic). If the entry
// should be logged, the Core adds itself to the CheckedEntry and returns
// the result.
//
// Callers must use Check before calling Write.
Check(Entry, *CheckedEntry) *CheckedEntry
// Write serializes the Entry and any Fields supplied at the log site and
// writes them to their destination.
//
// If called, Write should always log the Entry and Fields; it should not
// replicate the logic of Check.
Write(Entry, []Field) error
// Sync flushes buffered logs (if any).
Sync() error
}
type nopCore struct{}
// NewNopCore returns a no-op Core.
func NewNopCore() Core { return nopCore{} }
func (nopCore) Enabled(Level) bool { return false }
func (n nopCore) With([]Field) Core { return n }
func (nopCore) Check(_ Entry, ce *CheckedEntry) *CheckedEntry { return ce }
func (nopCore) Write(Entry, []Field) error { return nil }
func (nopCore) Sync() error { return nil }
// NewCore creates a Core that writes logs to a WriteSyncer.
func NewCore(enc Encoder, ws WriteSyncer, enab LevelEnabler) Core {
return &ioCore{
LevelEnabler: enab,
enc: enc,
out: ws,
}
}
type ioCore struct {
LevelEnabler
enc Encoder
out WriteSyncer
}
func (c *ioCore) With(fields []Field) Core {
clone := c.clone()
addFields(clone.enc, fields)
return clone
}
func (c *ioCore) Check(ent Entry, ce *CheckedEntry) *CheckedEntry {
if c.Enabled(ent.Level) {
return ce.AddCore(ent, c)
}
return ce
}
func (c *ioCore) Write(ent Entry, fields []Field) error {
buf, err := c.enc.EncodeEntry(ent, fields)
if err != nil {
return err
}
_, err = c.out.Write(buf.Bytes())
buf.Free()
if err != nil {
return err
}
if ent.Level > ErrorLevel {
// Since we may be crashing the program, sync the output. Ignore Sync
// errors, pending a clean solution to issue #370.
c.Sync()
}
return nil
}
func (c *ioCore) Sync() error {
return c.out.Sync()
}
func (c *ioCore) clone() *ioCore {
return &ioCore{
LevelEnabler: c.LevelEnabler,
enc: c.enc.Clone(),
out: c.out,
}
}
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