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logs.go
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logs.go
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package apps
import (
"encoding/json"
"fmt"
stdio "io"
"io/ioutil"
"net/url"
"os"
"strings"
"time"
"github.com/Scalingo/cli/Godeps/_workspace/src/golang.org/x/net/websocket"
"github.com/Scalingo/cli/Godeps/_workspace/src/gopkg.in/errgo.v1"
"github.com/Scalingo/cli/api"
"github.com/Scalingo/cli/config"
"github.com/Scalingo/cli/debug"
"github.com/Scalingo/cli/io"
)
type WSEvent struct {
Type string `json:"event"`
Log string `json:"log"`
Timestamp time.Time `json:"timestamp"`
}
type LogsRes struct {
LogsURL string `json:"logs_url"`
App *api.App `json:"app"`
}
func Logs(appName string, stream bool, n int, filter string) error {
err := checkFilter(appName, filter)
if err != nil {
return errgo.Mask(err, errgo.Any)
}
res, err := api.LogsURL(appName)
if err != nil {
return errgo.Mask(err, errgo.Any)
}
defer res.Body.Close()
if res.StatusCode != 200 {
return errgo.Newf("fail to query logs: %s", res.Status)
}
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return errgo.Mask(err, errgo.Any)
}
debug.Println("[API-Response] ", string(body))
logsRes := &LogsRes{}
if err = json.Unmarshal(body, &logsRes); err != nil {
return errgo.Mask(err, errgo.Any)
}
if err = dumpLogs(logsRes.LogsURL, n, filter); err != nil {
return errgo.Mask(err, errgo.Any)
}
if stream {
if err = streamLogs(logsRes.LogsURL, filter); err != nil {
return errgo.Mask(err, errgo.Any)
}
}
return nil
}
func dumpLogs(logsURL string, n int, filter string) error {
res, err := api.Logs(logsURL, n, filter)
if err != nil {
return errgo.Mask(err, errgo.Any)
}
defer res.Body.Close()
if res.StatusCode == 404 {
io.Error("There is not log for this application.")
return nil
}
_, err = stdio.Copy(os.Stdout, res.Body)
if err != nil {
return errgo.Mask(err, errgo.Any)
}
return nil
}
func streamLogs(logsRawURL string, filter string) error {
var (
err error
buffer [20480]byte
event WSEvent
)
logsURL, err := url.Parse(logsRawURL)
if err != nil {
return errgo.Mask(err, errgo.Any)
}
if logsURL.Scheme == "https" {
logsURL.Scheme = "wss"
} else {
logsURL.Scheme = "ws"
}
logsURLString := fmt.Sprintf("%s&stream=true", logsURL.String())
if filter != "" {
logsURLString = fmt.Sprintf("%s&filter=%s", logsURLString, filter)
}
conn, err := websocket.Dial(logsURLString, "", "http://scalingo-cli.local/"+config.Version)
if err != nil {
return errgo.Mask(err, errgo.Any)
}
for {
n, err := conn.Read(buffer[:])
if err != nil {
return errgo.Mask(err, errgo.Any)
}
debug.Println(string(buffer[:n]))
err = json.Unmarshal(buffer[:n], &event)
if err != nil {
return errgo.Notef(err, "invalid JSON %v", string(buffer[:n]))
}
switch event.Type {
case "ping":
case "log":
fmt.Println(strings.TrimSpace(event.Log))
}
}
}
func checkFilter(appName string, filter string) error {
if filter != "" {
processes, err := api.AppsPs(appName)
if err != nil {
return errgo.Mask(err)
}
filters := strings.Split(filter, "|")
for _, f := range filters {
ctName := ""
for _, ct := range processes {
ctName = ct.Name
if strings.HasPrefix(f, ctName+"-") || f == ctName {
break
}
}
if !strings.HasPrefix(f, ctName+"-") && f != ctName {
return errgo.Newf(
"%s is not a valid container filter\n\nEXAMPLES:\n"+
"\"scalingo logs -F web\": logs of every web containers\n"+
"\"scalingo logs -F web-1\": logs of web container 1\n"+
"\"scalingo logs -F web|worker\": logs of every web and worker containers\n",
f)
}
}
}
return nil
}