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fluentd.go
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fluentd.go
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// Package fluentd provides the log driver for forwarding server logs
// to fluentd endpoints.
package fluentd
import (
"fmt"
"math"
"net"
"strconv"
"strings"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/daemon/logger"
"github.com/docker/docker/daemon/logger/loggerutils"
"github.com/docker/go-units"
"github.com/fluent/fluent-logger-golang/fluent"
)
type fluentd struct {
tag string
containerID string
containerName string
writer *fluent.Fluent
extra map[string]string
}
const (
name = "fluentd"
defaultHost = "127.0.0.1"
defaultPort = 24224
defaultBufferLimit = 1024 * 1024
defaultTagPrefix = "docker"
// logger tries to reconnect 2**32 - 1 times
// failed (and panic) after 204 years [ 1.5 ** (2**32 - 1) - 1 seconds]
defaultRetryWait = 1000
defaultTimeout = 3 * time.Second
defaultMaxRetries = math.MaxInt32
defaultReconnectWaitIncreRate = 1.5
addressKey = "fluentd-address"
bufferLimitKey = "fluentd-buffer-limit"
retryWaitKey = "fluentd-retry-wait"
maxRetriesKey = "fluentd-max-retries"
asyncConnectKey = "fluentd-async-connect"
)
func init() {
if err := logger.RegisterLogDriver(name, New); err != nil {
logrus.Fatal(err)
}
if err := logger.RegisterLogOptValidator(name, ValidateLogOpt); err != nil {
logrus.Fatal(err)
}
}
// New creates a fluentd logger using the configuration passed in on
// the context. The supported context configuration variable is
// fluentd-address.
func New(ctx logger.Context) (logger.Logger, error) {
host, port, err := parseAddress(ctx.Config[addressKey])
if err != nil {
return nil, err
}
tag, err := loggerutils.ParseLogTag(ctx, "{{.DaemonName}}.{{.ID}}")
if err != nil {
return nil, err
}
extra := ctx.ExtraAttributes(nil)
bufferLimit := defaultBufferLimit
if ctx.Config[bufferLimitKey] != "" {
bl64, err := units.RAMInBytes(ctx.Config[bufferLimitKey])
if err != nil {
return nil, err
}
bufferLimit = int(bl64)
}
retryWait := defaultRetryWait
if ctx.Config[retryWaitKey] != "" {
rwd, err := time.ParseDuration(ctx.Config[retryWaitKey])
if err != nil {
return nil, err
}
retryWait = int(rwd.Seconds() * 1000)
}
maxRetries := defaultMaxRetries
if ctx.Config[maxRetriesKey] != "" {
mr64, err := strconv.ParseUint(ctx.Config[maxRetriesKey], 10, strconv.IntSize)
if err != nil {
return nil, err
}
maxRetries = int(mr64)
}
asyncConnect := false
if ctx.Config[asyncConnectKey] != "" {
if asyncConnect, err = strconv.ParseBool(ctx.Config[asyncConnectKey]); err != nil {
return nil, err
}
}
fluentConfig := fluent.Config{
FluentPort: port,
FluentHost: host,
BufferLimit: bufferLimit,
RetryWait: retryWait,
MaxRetry: maxRetries,
AsyncConnect: asyncConnect,
}
logrus.WithField("container", ctx.ContainerID).WithField("config", fluentConfig).
Debug("logging driver fluentd configured")
log, err := fluent.New(fluentConfig)
if err != nil {
return nil, err
}
return &fluentd{
tag: tag,
containerID: ctx.ContainerID,
containerName: ctx.ContainerName,
writer: log,
extra: extra,
}, 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),
}
for k, v := range f.extra {
data[k] = v
}
// 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 (f *fluentd) Close() error {
return f.writer.Close()
}
func (f *fluentd) Name() string {
return name
}
// ValidateLogOpt looks for fluentd specific log option fluentd-address.
func ValidateLogOpt(cfg map[string]string) error {
for key := range cfg {
switch key {
case "env":
case "labels":
case "tag":
case addressKey:
case bufferLimitKey:
case retryWaitKey:
case maxRetriesKey:
case asyncConnectKey:
// Accepted
default:
return fmt.Errorf("unknown log opt '%s' for fluentd log driver", key)
}
}
if _, _, err := parseAddress(cfg["fluentd-address"]); err != nil {
return err
}
return nil
}
func parseAddress(address string) (string, int, error) {
if address == "" {
return defaultHost, defaultPort, nil
}
host, port, err := net.SplitHostPort(address)
if err != nil {
if !strings.Contains(err.Error(), "missing port in address") {
return "", 0, fmt.Errorf("invalid fluentd-address %s: %s", address, err)
}
return host, defaultPort, nil
}
portnum, err := strconv.Atoi(port)
if err != nil {
return "", 0, fmt.Errorf("invalid fluentd-address %s: %s", address, err)
}
return host, portnum, nil
}