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moby--moby/daemon/logger/context.go
Daniel Dao 5794a0190d add labels/env log option for gelf
this allows gelf logger to collect extra metadata from containers with
`--log-opt labels=label1,label2 --log-opt env=env1,env2`

Additional log field will be prefixed with `_` as per gelf protocol
https://www.graylog.org/resources/gelf/

Signed-off-by: Daniel Dao <dqminh@cloudflare.com>
2015-10-12 21:12:46 +02:00

112 lines
2.7 KiB
Go

package logger
import (
"fmt"
"os"
"strings"
"time"
)
// Context provides enough information for a logging driver to do its function.
type Context struct {
Config map[string]string
ContainerID string
ContainerName string
ContainerEntrypoint string
ContainerArgs []string
ContainerImageID string
ContainerImageName string
ContainerCreated time.Time
ContainerEnv []string
ContainerLabels map[string]string
LogPath string
}
// ExtraAttributes returns the user-defined extra attributes (labels,
// environment variables) in key-value format. This can be used by log drivers
// that support metadata to add more context to a log.
func (ctx *Context) ExtraAttributes(keyMod func(string) string) map[string]string {
extra := make(map[string]string)
labels, ok := ctx.Config["labels"]
if ok && len(labels) > 0 {
for _, l := range strings.Split(labels, ",") {
if v, ok := ctx.ContainerLabels[l]; ok {
if keyMod != nil {
l = keyMod(l)
}
extra[l] = v
}
}
}
env, ok := ctx.Config["env"]
if ok && len(env) > 0 {
envMapping := make(map[string]string)
for _, e := range ctx.ContainerEnv {
if kv := strings.SplitN(e, "=", 2); len(kv) == 2 {
envMapping[kv[0]] = kv[1]
}
}
for _, l := range strings.Split(env, ",") {
if v, ok := envMapping[l]; ok {
if keyMod != nil {
l = keyMod(l)
}
extra[l] = v
}
}
}
return extra
}
// Hostname returns the hostname from the underlying OS.
func (ctx *Context) Hostname() (string, error) {
hostname, err := os.Hostname()
if err != nil {
return "", fmt.Errorf("logger: can not resolve hostname: %v", err)
}
return hostname, nil
}
// Command returns the command that the container being logged was
// started with. The Entrypoint is prepended to the container
// arguments.
func (ctx *Context) Command() string {
terms := []string{ctx.ContainerEntrypoint}
for _, arg := range ctx.ContainerArgs {
terms = append(terms, arg)
}
command := strings.Join(terms, " ")
return command
}
// ID Returns the Container ID shortened to 12 characters.
func (ctx *Context) ID() string {
return ctx.ContainerID[:12]
}
// FullID is an alias of ContainerID.
func (ctx *Context) FullID() string {
return ctx.ContainerID
}
// Name returns the ContainerName without a preceding '/'.
func (ctx *Context) Name() string {
return ctx.ContainerName[1:]
}
// ImageID returns the ContainerImageID shortened to 12 characters.
func (ctx *Context) ImageID() string {
return ctx.ContainerImageID[:12]
}
// ImageFullID is an alias of ContainerID.
func (ctx *Context) ImageFullID() string {
return ctx.ContainerImageID
}
// ImageName is an alias of ContainerImageName
func (ctx *Context) ImageName() string {
return ctx.ContainerImageName
}