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driver.go
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driver.go
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//
// KULADO INC. CONFIDENTIAL
// __________________
//
// [2014] - [2018] KULADO INC.
// All Rights Reserved.
//
// NOTICE: All information contained herein is, and remains
// the property of KULADO INC. and its suppliers,
// if any. The intellectual and technical concepts contained
// herein are proprietary to KULADO INC.
// and its suppliers and may be covered by Russian Federation and Foreign Patents,
// patents in process, and are protected by trade secret or copyright law.
// Dissemination of this information or reproduction of this material
// is strictly forbidden unless prior written permission is obtained
// from KULADO INC..
//
package docker
import (
"context"
"encoding/binary"
"encoding/json"
"fmt"
"io"
"path"
"sync"
"syscall"
"time"
"github.com/docker/docker/api/types/plugins/logdriver"
"github.com/docker/docker/daemon/logger"
"github.com/docker/docker/daemon/logger/loggerutils"
protoio "github.com/gogo/protobuf/io"
"github.com/onedomain/lastbackend/pkg/distribution/types"
"github.com/onedomain/lastbackend/pkg/log"
"github.com/onedomain/lastbackend/pkg/util/proxy"
"github.com/pkg/errors"
"github.com/tonistiigi/fifo"
)
type driver struct {
mu sync.Mutex
logs map[string]*logPair
idx map[string]*logPair
logger logger.Logger
proxy *proxy.Client
}
type logPair struct {
active bool
file string
info logger.Info
Message types.LogMessage
stream io.ReadCloser
}
const (
hostAddr = "127.0.0.1:2963"
)
func NewDriver() *driver {
return &driver{
proxy: proxy.NewClient("driver", hostAddr, nil),
logs: make(map[string]*logPair),
idx: make(map[string]*logPair),
}
}
func (d *driver) StartLogging(file string, logCtx logger.Info) error {
d.mu.Lock()
if _, exists := d.logs[path.Base(file)]; exists {
d.mu.Unlock()
return fmt.Errorf("logger for %q already exists", file)
}
d.mu.Unlock()
stream, err := fifo.OpenFifo(context.Background(), file, syscall.O_RDONLY, 0700)
if err != nil {
return errors.Wrapf(err, "error opening logger fifo: %q", file)
}
tag, err := loggerutils.ParseLogTag(logCtx, loggerutils.DefaultTemplate)
if err != nil {
return err
}
extra, err := logCtx.ExtraAttributes(nil)
if err != nil {
return err
}
hostname, err := logCtx.Hostname()
if err != nil {
return err
}
msg := types.LogMessage{
ContainerId: logCtx.FullID(),
ContainerName: logCtx.Name(),
ContainerType: logCtx.ContainerLabels[types.ContainerTypeRuntime],
Selflink: logCtx.ContainerLabels[types.ContainerTypeLBC],
ContainerCreated: types.JsonTime{logCtx.ContainerCreated},
Tag: tag,
Extra: extra,
Host: hostname,
}
d.mu.Lock()
lp := &logPair{true, file, logCtx, msg, stream}
d.logs[path.Base(file)] = lp
d.idx[logCtx.ContainerID] = lp
d.mu.Unlock()
go consumeLog(d, lp)
return nil
}
func (d *driver) StopLogging(file string) error {
d.mu.Lock()
lp, ok := d.logs[path.Base(file)]
if ok {
lp.active = false
delete(d.logs, path.Base(file))
delete(d.idx, lp.info.ContainerID)
} else {
log.Errorf("Failed to stop logging. File %q is not active", file)
}
d.mu.Unlock()
return nil
}
func consumeLog(d *driver, lp *logPair) {
var buf logdriver.LogEntry
dec := protoio.NewUint32DelimitedReader(lp.stream, binary.BigEndian, 1e6)
defer func() { _ = dec.Close() }()
defer shutdownLogPair(lp)
for {
if !lp.active {
return
}
err := dec.ReadMsg(&buf)
if err != nil {
if err == io.EOF {
return
} else {
dec = protoio.NewUint32DelimitedReader(lp.stream, binary.BigEndian, 1e6)
continue
}
}
lp.Message.Data = string(buf.Line[:])
lp.Message.Timestamp = types.JsonTime{time.Now()}
msg, err := json.Marshal(lp.Message)
if err != nil {
continue
}
if err := d.proxy.Send(msg); err != nil {
continue
}
buf.Reset()
}
}
func shutdownLogPair(lp *logPair) {
if lp.stream != nil {
_ = lp.stream.Close()
}
lp.active = false
}