You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
197 lines
3.9 KiB
Go
197 lines
3.9 KiB
Go
// Copyright 2019 Drone.IO Inc. All rights reserved.
|
|
// Use of this source code is governed by the Polyform License
|
|
// that can be found in the LICENSE file.
|
|
|
|
// Package livelog provides a Writer that collects pipeline
|
|
// output and streams to the central server.
|
|
package livelog
|
|
|
|
import (
|
|
"context"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
"git.awesome-for.me/liuzhiguo/drone-go/drone"
|
|
"git.awesome-for.me/liuzhiguo/runner-go/client"
|
|
)
|
|
|
|
// defaultLimit is the default maximum log size in bytes.
|
|
const defaultLimit = 5242880 // 5MB
|
|
|
|
// Writer is an io.Writer that sends logs to the server.
|
|
type Writer struct {
|
|
sync.Mutex
|
|
|
|
client client.Client
|
|
|
|
id int64
|
|
num int
|
|
now time.Time
|
|
size int
|
|
limit int
|
|
|
|
interval time.Duration
|
|
pending []*drone.Line
|
|
history []*drone.Line
|
|
|
|
closed bool
|
|
close chan struct{}
|
|
ready chan struct{}
|
|
}
|
|
|
|
// New returns a new Wrtier.
|
|
func New(client client.Client, id int64) *Writer {
|
|
b := &Writer{
|
|
client: client,
|
|
id: id,
|
|
now: time.Now(),
|
|
limit: defaultLimit,
|
|
interval: time.Second,
|
|
close: make(chan struct{}),
|
|
ready: make(chan struct{}, 1),
|
|
}
|
|
go b.start()
|
|
return b
|
|
}
|
|
|
|
// SetLimit sets the Writer limit.
|
|
func (b *Writer) SetLimit(limit int) {
|
|
b.limit = limit
|
|
}
|
|
|
|
// SetInterval sets the Writer flusher interval.
|
|
func (b *Writer) SetInterval(interval time.Duration) {
|
|
b.interval = interval
|
|
}
|
|
|
|
// Write uploads the live log stream to the server.
|
|
func (b *Writer) Write(p []byte) (n int, err error) {
|
|
for _, part := range split(p) {
|
|
line := &drone.Line{
|
|
Number: b.num,
|
|
Message: part,
|
|
Timestamp: int64(time.Since(b.now).Seconds()),
|
|
}
|
|
|
|
for b.size+len(p) > b.limit {
|
|
b.stop() // buffer is full, step streaming data
|
|
b.size -= len(b.history[0].Message)
|
|
b.history = b.history[1:]
|
|
}
|
|
|
|
b.size = b.size + len(part)
|
|
b.num++
|
|
|
|
if b.stopped() == false {
|
|
b.Lock()
|
|
b.pending = append(b.pending, line)
|
|
b.Unlock()
|
|
}
|
|
|
|
b.Lock()
|
|
b.history = append(b.history, line)
|
|
b.Unlock()
|
|
}
|
|
|
|
select {
|
|
case b.ready <- struct{}{}:
|
|
default:
|
|
}
|
|
|
|
return len(p), nil
|
|
}
|
|
|
|
// Close closes the writer and uploads the full contents to
|
|
// the server.
|
|
func (b *Writer) Close() error {
|
|
if b.stop() {
|
|
b.flush()
|
|
}
|
|
return b.upload()
|
|
}
|
|
|
|
// upload uploads the full log history to the server.
|
|
func (b *Writer) upload() error {
|
|
return b.client.Upload(
|
|
context.Background(), b.id, b.history)
|
|
}
|
|
|
|
// flush batch uploads all buffered logs to the server.
|
|
func (b *Writer) flush() error {
|
|
b.Lock()
|
|
lines := b.copy()
|
|
b.clear()
|
|
b.Unlock()
|
|
if len(lines) == 0 {
|
|
return nil
|
|
}
|
|
return b.client.Batch(
|
|
context.Background(), b.id, lines)
|
|
}
|
|
|
|
// copy returns a copy of the buffered lines.
|
|
func (b *Writer) copy() []*drone.Line {
|
|
return append(b.pending[:0:0], b.pending...)
|
|
}
|
|
|
|
// clear clears the buffer.
|
|
func (b *Writer) clear() {
|
|
b.pending = b.pending[:0]
|
|
}
|
|
|
|
func (b *Writer) stop() bool {
|
|
b.Lock()
|
|
var closed bool
|
|
if b.closed == false {
|
|
close(b.close)
|
|
closed = true
|
|
b.closed = true
|
|
}
|
|
b.Unlock()
|
|
return closed
|
|
}
|
|
|
|
func (b *Writer) stopped() bool {
|
|
b.Lock()
|
|
closed := b.closed
|
|
b.Unlock()
|
|
return closed
|
|
}
|
|
|
|
func (b *Writer) start() error {
|
|
for {
|
|
select {
|
|
case <-b.close:
|
|
return nil
|
|
case <-b.ready:
|
|
select {
|
|
case <-b.close:
|
|
return nil
|
|
case <-time.After(b.interval):
|
|
// we intentionally ignore errors. log streams
|
|
// are ephemeral and are considered low prioirty
|
|
// because they are not required for drone to
|
|
// operator, and the impact of failure is minimal
|
|
b.flush()
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func split(p []byte) []string {
|
|
s := string(p)
|
|
v := []string{s}
|
|
// kubernetes buffers the output and may combine
|
|
// multiple lines into a single block of output.
|
|
// Split into multiple lines.
|
|
//
|
|
// note that docker output always inclines a line
|
|
// feed marker. This needs to be accounted for when
|
|
// splitting the output into multiple lines.
|
|
if strings.Contains(strings.TrimSuffix(s, "\n"), "\n") {
|
|
v = strings.SplitAfter(s, "\n")
|
|
}
|
|
return v
|
|
}
|