// New creates a gelf logger using the configuration passed in on the
// context. The supported context configuration variable is gelf-address.
func New(info logger.Info) (logger.Logger, error) {
// parse gelf address
address, err := parseAddress(info.Config["gelf-address"])
if err != nil {
return nil, err
}
// collect extra data for GELF message
hostname, err := info.Hostname()
if err != nil {
return nil, fmt.Errorf("gelf: cannot access hostname to set source field")
}
// parse log tag
tag, err := loggerutils.ParseLogTag(info, loggerutils.DefaultTemplate)
if err != nil {
return nil, err
}
extra := map[string]interface{}{
"_container_id": info.ContainerID,
"_container_name": info.Name(),
"_image_id": info.ContainerImageID,
"_image_name": info.ContainerImageName,
"_command": info.Command(),
"_tag": tag,
"_created": info.ContainerCreated,
}
extraAttrs := info.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 := info.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 := info.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,
info: info,
hostname: hostname,
rawExtra: rawExtra,
}, nil
}
// New creates a new logger that logs to Google Cloud Logging using the application
// default credentials.
//
// See https://developers.google.com/identity/protocols/application-default-credentials
func New(info logger.Info) (logger.Logger, error) {
initGCP()
var project string
if projectID != "" {
project = projectID
}
if projectID, found := info.Config[projectOptKey]; found {
project = projectID
}
if project == "" {
return nil, fmt.Errorf("No project was specified and couldn't read project from the meatadata server. Please specify a project")
}
// Issue #29344: gcplogs segfaults (static binary)
// If HOME is not set, logging.NewClient() will call os/user.Current() via oauth2/google.
// However, in static binary, os/user.Current() leads to segfault due to a glibc issue that won't be fixed
// in a short term. (golang/go#13470, https://sourceware.org/bugzilla/show_bug.cgi?id=19341)
// So we forcibly set HOME so as to avoid call to os/user/Current()
if err := ensureHomeIfIAmStatic(); err != nil {
return nil, err
}
c, err := logging.NewClient(context.Background(), project)
if err != nil {
return nil, err
}
lg := c.Logger("gcplogs-docker-driver")
if err := c.Ping(context.Background()); err != nil {
return nil, fmt.Errorf("unable to connect or authenticate with Google Cloud Logging: %v", err)
}
l := &gcplogs{
logger: lg,
container: &containerInfo{
Name: info.ContainerName,
ID: info.ContainerID,
ImageName: info.ContainerImageName,
ImageID: info.ContainerImageID,
Created: info.ContainerCreated,
Metadata: info.ExtraAttributes(nil),
},
}
if info.Config[logCmdKey] == "true" {
l.container.Command = info.Command()
}
if onGCE {
l.instance = &instanceInfo{
Zone: zone,
Name: instanceName,
ID: instanceID,
}
} else if info.Config[logZoneKey] != "" || info.Config[logNameKey] != "" || info.Config[logIDKey] != "" {
l.instance = &instanceInfo{
Zone: info.Config[logZoneKey],
Name: info.Config[logNameKey],
ID: info.Config[logIDKey],
}
}
// The logger "overflows" at a rate of 10,000 logs per second and this
// overflow func is called. We want to surface the error to the user
// without overly spamming /var/log/docker.log so we log the first time
// we overflow and every 1000th time after.
c.OnError = func(err error) {
if err == logging.ErrOverflow {
if i := atomic.AddUint64(&droppedLogs, 1); i%1000 == 1 {
logrus.Errorf("gcplogs driver has dropped %v logs", i)
}
} else {
logrus.Error(err)
}
}
return l, nil
}
