README
¶
dlog
Go library to parse the binary Docker Logs stream into plain text.
dlog offers a single method: NewReader(r io.Reader) io.Reader. You are
supposed to give the response body of the /containers/<id>/logs. The returned
reader strips off the log headers and just gives the plain text to be used.
Here is how a log line from container looks like in the the raw docker logs stream:
01 00 00 00 00 00 00 1f 52 6f 73 65 73 20 61 72 65 ...
│ ─────┬── ─────┬───── R o s e s a r e ...
│ │ │
└stdout │ │
│ └─ 0x0000001f = log message is 31 bytes
unused
You can get the logs stream from go-dockerclient's Logs()
method, or by calling the container logs endpoint direclty via the UNIX socket
directly.
See example_test.go for an example usage.
This library is written in vanilla Go and has no external dependencies.
Licensed under Apache 2.0. Copyright 2017 Ahmet Alp Balkan.
Documentation
¶
Overview ¶
Package dlog provides utilities to read Docker Logs API stream format.
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func NewReader ¶
NewReader returns a reader that strips off the message headers from the underlying raw docker logs stream and returns the messages.
Example ¶
package main
import (
"bufio"
"context"
"fmt"
"log"
"net"
"net/http"
"github.com/ahmetalpbalkan/dlog"
)
func main() {
client := &http.Client{
Transport: &http.Transport{
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
conn, err := net.Dial("unix", "/var/run/docker.sock")
if err != nil {
return nil, fmt.Errorf("cannot connect docker socket: %v", err)
}
return conn, nil
}}}
url := "http://-/containers/CONTAINER_NAME/logs?stdout=1&stderr=1&follow=1"
resp, err := client.Get(url)
if err != nil {
log.Fatalf("request failed: %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
log.Fatalf("unexpected status code: %s", resp.Status)
}
// At this point we have a logs stream, here is how to read each log line
// from container:
r := dlog.NewReader(resp.Body)
s := bufio.NewScanner(r)
for s.Scan() {
log.Println(s)
}
if err := s.Err(); err != nil {
log.Fatalf("read error: %v", err)
}
}
Output:
Types ¶
This section is empty.
Source Files