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fluentd.go
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fluentd.go
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package fluentd
import (
"bytes"
"fmt"
"math"
"net"
"strconv"
"strings"
"text/template"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/daemon/logger"
"github.com/fluent/fluent-logger-golang/fluent"
)
type Fluentd struct {
tag string
containerID string
containerName string
writer *fluent.Fluent
}
type Receiver struct {
ID string
FullID string
Name string
}
const (
name = "fluentd"
defaultHostName = "localhost"
defaultPort = 24224
defaultTagPrefix = "docker"
)
func init() {
if err := logger.RegisterLogDriver(name, New); err != nil {
logrus.Fatal(err)
}
if err := logger.RegisterLogOptValidator(name, ValidateLogOpt); err != nil {
logrus.Fatal(err)
}
}
func parseConfig(ctx logger.Context) (string, int, string, error) {
host := defaultHostName
port := defaultPort
tag := "docker." + ctx.ContainerID[:12]
config := ctx.Config
if address := config["fluentd-address"]; address != "" {
if h, p, err := net.SplitHostPort(address); err != nil {
if !strings.Contains(err.Error(), "missing port in address") {
return "", 0, "", err
}
host = h
} else {
portnum, err := strconv.Atoi(p)
if err != nil {
return "", 0, "", err
}
host = h
port = portnum
}
}
if config["fluentd-tag"] != "" {
receiver := &Receiver{
ID: ctx.ContainerID[:12],
FullID: ctx.ContainerID,
Name: ctx.ContainerName,
}
tmpl, err := template.New("tag").Parse(config["fluentd-tag"])
if err != nil {
return "", 0, "", err
}
buf := new(bytes.Buffer)
if err := tmpl.Execute(buf, receiver); err != nil {
return "", 0, "", err
}
tag = buf.String()
}
return host, port, tag, nil
}
func New(ctx logger.Context) (logger.Logger, error) {
host, port, tag, err := parseConfig(ctx)
if err != nil {
return nil, err
}
logrus.Debugf("logging driver fluentd configured for container:%s, host:%s, port:%d, tag:%s.", ctx.ContainerID, host, port, tag)
// logger tries to recoonect 2**32 - 1 times
// failed (and panic) after 204 years [ 1.5 ** (2**32 - 1) - 1 seconds]
log, err := fluent.New(fluent.Config{FluentPort: port, FluentHost: host, RetryWait: 1000, MaxRetry: math.MaxInt32})
if err != nil {
return nil, err
}
return &Fluentd{
tag: tag,
containerID: ctx.ContainerID,
containerName: ctx.ContainerName,
writer: log,
}, nil
}
func (f *Fluentd) Log(msg *logger.Message) error {
data := map[string]string{
"container_id": f.containerID,
"container_name": f.containerName,
"source": msg.Source,
"log": string(msg.Line),
}
// fluent-logger-golang buffers logs from failures and disconnections,
// and these are transferred again automatically.
return f.writer.PostWithTime(f.tag, msg.Timestamp, data)
}
func ValidateLogOpt(cfg map[string]string) error {
for key := range cfg {
switch key {
case "fluentd-address":
case "fluentd-tag":
default:
return fmt.Errorf("unknown log opt '%s' for fluentd log driver", key)
}
}
return nil
}
func (f *Fluentd) Close() error {
return f.writer.Close()
}
func (f *Fluentd) Name() string {
return name
}