mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
27bd6842f8
Logging plugins use the same HTTP interface as other plugins for basic
command operations meanwhile actual logging operations are handled (on
Unix) via a fifo.
The plugin interface looks like so:
```go
type loggingPlugin interface {
StartLogging(fifoPath string, loggingContext Context) error
StopLogging(fifoPath)
```
This means a plugin must implement `LoggingDriver.StartLogging` and
`LoggingDriver.StopLogging` endpoints and be able to consume the passed
in fifo.
Logs are sent via stream encoder to the fifo encoded with protobuf.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
134 lines
3.4 KiB
Go
134 lines
3.4 KiB
Go
// Protocol Buffers for Go with Gadgets
|
|
//
|
|
// Copyright (c) 2013, The GoGo Authors. All rights reserved.
|
|
// http://github.com/gogo/protobuf
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following disclaimer
|
|
// in the documentation and/or other materials provided with the
|
|
// distribution.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
package io
|
|
|
|
import (
|
|
"bufio"
|
|
"encoding/binary"
|
|
"errors"
|
|
"github.com/gogo/protobuf/proto"
|
|
"io"
|
|
)
|
|
|
|
var (
|
|
errSmallBuffer = errors.New("Buffer Too Small")
|
|
errLargeValue = errors.New("Value is Larger than 64 bits")
|
|
)
|
|
|
|
func NewDelimitedWriter(w io.Writer) WriteCloser {
|
|
return &varintWriter{w, make([]byte, 10), nil}
|
|
}
|
|
|
|
type varintWriter struct {
|
|
w io.Writer
|
|
lenBuf []byte
|
|
buffer []byte
|
|
}
|
|
|
|
func (this *varintWriter) WriteMsg(msg proto.Message) (err error) {
|
|
var data []byte
|
|
if m, ok := msg.(marshaler); ok {
|
|
n, ok := getSize(m)
|
|
if !ok {
|
|
data, err = proto.Marshal(msg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if n >= len(this.buffer) {
|
|
this.buffer = make([]byte, n)
|
|
}
|
|
_, err = m.MarshalTo(this.buffer)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
data = this.buffer[:n]
|
|
} else {
|
|
data, err = proto.Marshal(msg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
length := uint64(len(data))
|
|
n := binary.PutUvarint(this.lenBuf, length)
|
|
_, err = this.w.Write(this.lenBuf[:n])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
_, err = this.w.Write(data)
|
|
return err
|
|
}
|
|
|
|
func (this *varintWriter) Close() error {
|
|
if closer, ok := this.w.(io.Closer); ok {
|
|
return closer.Close()
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func NewDelimitedReader(r io.Reader, maxSize int) ReadCloser {
|
|
var closer io.Closer
|
|
if c, ok := r.(io.Closer); ok {
|
|
closer = c
|
|
}
|
|
return &varintReader{bufio.NewReader(r), nil, maxSize, closer}
|
|
}
|
|
|
|
type varintReader struct {
|
|
r *bufio.Reader
|
|
buf []byte
|
|
maxSize int
|
|
closer io.Closer
|
|
}
|
|
|
|
func (this *varintReader) ReadMsg(msg proto.Message) error {
|
|
length64, err := binary.ReadUvarint(this.r)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
length := int(length64)
|
|
if length < 0 || length > this.maxSize {
|
|
return io.ErrShortBuffer
|
|
}
|
|
if len(this.buf) < length {
|
|
this.buf = make([]byte, length)
|
|
}
|
|
buf := this.buf[:length]
|
|
if _, err := io.ReadFull(this.r, buf); err != nil {
|
|
return err
|
|
}
|
|
return proto.Unmarshal(buf, msg)
|
|
}
|
|
|
|
func (this *varintReader) Close() error {
|
|
if this.closer != nil {
|
|
return this.closer.Close()
|
|
}
|
|
return nil
|
|
}
|