// New creates a gelf logger using the configuration passed in on the
// context. Supported context configuration variables are
// gelf-address, & gelf-tag.
func New(ctx logger.Context) (logger.Logger, error) {
// parse gelf address
address, err := parseAddress(ctx.Config["gelf-address"])
if err != nil {
return nil, err
}
// collect extra data for GELF message
hostname, err := ctx.Hostname()
if err != nil {
return nil, fmt.Errorf("gelf: cannot access hostname to set source field")
}
// remove trailing slash from container name
containerName := bytes.TrimLeft([]byte(ctx.ContainerName), "/")
// parse log tag
tag, err := loggerutils.ParseLogTag(ctx, "")
if err != nil {
return nil, err
}
extra := map[string]interface{}{
"_container_id": ctx.ContainerID,
"_container_name": string(containerName),
"_image_id": ctx.ContainerImageID,
"_image_name": ctx.ContainerImageName,
"_command": ctx.Command(),
"_tag": tag,
"_created": ctx.ContainerCreated,
}
extraAttrs := ctx.ExtraAttributes(func(key string) string {
if key[0] == '_' {
return key
}
return "_" + key
})
for k, v := range extraAttrs {
extra[k] = v
}
// create new gelfWriter
gelfWriter, err := gelf.NewWriter(address)
if err != nil {
return nil, fmt.Errorf("gelf: cannot connect to GELF endpoint: %s %v", address, err)
}
return &gelfLogger{
writer: gelfWriter,
ctx: ctx,
hostname: hostname,
extra: extra,
}, nil
}
// New creates a gelf logger using the configuration passed in on the
// context. Supported context configuration variables are
// gelf-address, & gelf-tag.
func New(ctx logger.Context) (logger.Logger, error) {
// parse gelf address
address, err := parseAddress(ctx.Config["gelf-address"])
if err != nil {
return nil, err
}
// collect extra data for GELF message
hostname, err := ctx.Hostname()
if err != nil {
return nil, fmt.Errorf("gelf: cannot access hostname to set source field")
}
// remove trailing slash from container name
containerName := bytes.TrimLeft([]byte(ctx.ContainerName), "/")
// parse log tag
tag, err := loggerutils.ParseLogTag(ctx, "")
if err != nil {
return nil, err
}
fields := gelfFields{
hostname: hostname,
containerID: ctx.ContainerID,
containerName: string(containerName),
imageID: ctx.ContainerImageID,
imageName: ctx.ContainerImageName,
command: ctx.Command(),
tag: tag,
created: ctx.ContainerCreated,
}
// create new gelfWriter
gelfWriter, err := gelf.NewWriter(address)
if err != nil {
return nil, fmt.Errorf("gelf: cannot connect to GELF endpoint: %s %v", address, err)
}
return &gelfLogger{
writer: gelfWriter,
ctx: ctx,
fields: fields,
}, nil
}
// New creates a graylog2 hook
func New(address, facility string, extra map[string]interface{}, level logrus.Level) (logrus.Hook, error) {
w, err := gelf.NewWriter(address)
if err != nil {
return nil, err
}
hostname, err := hostname()
if err != nil {
return nil, err
}
return &Hook{
levels: levelThreshold(level),
w: w,
hostname: hostname,
facility: facility,
extra: extra,
}, err
}
// New creates a gelf logger using the configuration passed in on the
// context. The supported context configuration variable is gelf-address.
func New(ctx logger.Context) (logger.Logger, error) {
// parse gelf address
address, err := parseAddress(ctx.Config["gelf-address"])
if err != nil {
return nil, err
}
// collect extra data for GELF message
hostname, err := ctx.Hostname()
if err != nil {
return nil, fmt.Errorf("gelf: cannot access hostname to set source field")
}
// parse log tag
tag, err := loggerutils.ParseLogTag(ctx, loggerutils.DefaultTemplate)
if err != nil {
return nil, err
}
extra := map[string]interface{}{
"_container_id": ctx.ContainerID,
"_container_name": ctx.Name(),
"_image_id": ctx.ContainerImageID,
"_image_name": ctx.ContainerImageName,
"_command": ctx.Command(),
"_tag": tag,
"_created": ctx.ContainerCreated,
}
extraAttrs := ctx.ExtraAttributes(func(key string) string {
if key[0] == '_' {
return key
}
return "_" + key
})
for k, v := range extraAttrs {
extra[k] = v
}
rawExtra, err := json.Marshal(extra)
if err != nil {
return nil, err
}
// create new gelfWriter
gelfWriter, err := gelf.NewWriter(address)
if err != nil {
return nil, fmt.Errorf("gelf: cannot connect to GELF endpoint: %s %v", address, err)
}
if v, ok := ctx.Config["gelf-compression-type"]; ok {
switch v {
case "gzip":
gelfWriter.CompressionType = gelf.CompressGzip
case "zlib":
gelfWriter.CompressionType = gelf.CompressZlib
case "none":
gelfWriter.CompressionType = gelf.CompressNone
default:
return nil, fmt.Errorf("gelf: invalid compression type %q", v)
}
}
if v, ok := ctx.Config["gelf-compression-level"]; ok {
val, err := strconv.Atoi(v)
if err != nil {
return nil, fmt.Errorf("gelf: invalid compression level %s, err %v", v, err)
}
gelfWriter.CompressionLevel = val
}
return &gelfLogger{
writer: gelfWriter,
ctx: ctx,
hostname: hostname,
rawExtra: rawExtra,
}, nil
}
func sendGelf() {
r, w := io.Pipe()
stdoutWriter := bufio.NewWriter(os.Stdout)
gelfWriter, err := gelf.NewWriter(config.address)
if err != nil && config.debug {
log.Printf("Can not create GELF connection: %s", err)
}
/* combine STDIN and STDERR into one io.Pipe */
go func(writer io.Writer) {
stdinReader := bufio.NewReader(os.Stdin)
for true {
line, err := stdinReader.ReadString('\n')
if err != nil {
time.Sleep(300 * time.Millisecond)
} else {
writer.Write([]byte(line))
}
}
}(w)
go func(writer io.Writer) {
stderrReader := bufio.NewReader(os.Stderr)
for true {
line, err := stderrReader.ReadString('\n')
if err != nil {
time.Sleep(300 * time.Millisecond)
} else {
writer.Write([]byte(line))
}
}
}(w)
reader := bufio.NewReader(r)
/* send every log line as GELF message */
for true {
line, err := reader.ReadString('\n')
if err != nil {
/* No data could be read from STDIN/STDERR */
time.Sleep(300 * time.Millisecond)
continue
}
/* additionally print log line back to STDOUT */
if config.echo == true {
_, err = stdoutWriter.WriteString(string(line))
if err != nil && config.debug {
log.Printf("Failed to write log message to STDOUT: %s", err)
}
err = stdoutWriter.Flush()
if err != nil && config.debug {
log.Printf("Failed to flush STDOUT buffer: %s", err)
}
}
extraFields := make(map[string]interface{})
if len(config.tag) == 2 {
extraFields[getExtraFieldName(config.tag[0])] = config.tag[1]
}
m := gelf.Message{
Version: "1.1",
Host: config.source,
Short: string(line),
TimeUnix: float64(time.Now().UnixNano()/int64(time.Millisecond)) / 1000.0,
Level: 6,
Facility: config.facility,
Extra: extraFields,
}
if err := gelfWriter.WriteMessage(&m); err != nil && config.debug {
log.Printf("gelf: cannot send GELF message: %v", err)
}
}
gelfWriter.Close()
}