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|
package compat
import (
"encoding/binary"
"fmt"
"io"
"net/http"
"strconv"
"strings"
"sync"
"time"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/libpod/logs"
"github.com/containers/libpod/pkg/api/handlers/utils"
"github.com/containers/libpod/pkg/util"
"github.com/gorilla/schema"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
)
func LogsFromContainer(w http.ResponseWriter, r *http.Request) {
decoder := r.Context().Value("decoder").(*schema.Decoder)
runtime := r.Context().Value("runtime").(*libpod.Runtime)
query := struct {
Follow bool `schema:"follow"`
Stdout bool `schema:"stdout"`
Stderr bool `schema:"stderr"`
Since string `schema:"since"`
Until string `schema:"until"`
Timestamps bool `schema:"timestamps"`
Tail string `schema:"tail"`
}{
Tail: "all",
}
if err := decoder.Decode(&query, r.URL.Query()); err != nil {
utils.Error(w, "Something went wrong.", http.StatusBadRequest, errors.Wrapf(err, "Failed to parse parameters for %s", r.URL.String()))
return
}
if !(query.Stdout || query.Stderr) {
msg := fmt.Sprintf("%s: you must choose at least one stream", http.StatusText(http.StatusBadRequest))
utils.Error(w, msg, http.StatusBadRequest, errors.Errorf("%s for %s", msg, r.URL.String()))
return
}
name := utils.GetName(r)
ctnr, err := runtime.LookupContainer(name)
if err != nil {
utils.ContainerNotFound(w, name, err)
return
}
var tail int64 = -1
if query.Tail != "all" {
tail, err = strconv.ParseInt(query.Tail, 0, 64)
if err != nil {
utils.BadRequest(w, "tail", query.Tail, err)
return
}
}
var since time.Time
if _, found := r.URL.Query()["since"]; found {
since, err = util.ParseInputTime(query.Since)
if err != nil {
utils.BadRequest(w, "since", query.Since, err)
return
}
}
var until time.Time
if _, found := r.URL.Query()["until"]; found {
// FIXME: until != since but the logs backend does not yet support until.
since, err = util.ParseInputTime(query.Until)
if err != nil {
utils.BadRequest(w, "until", query.Until, err)
return
}
}
options := &logs.LogOptions{
Details: true,
Follow: query.Follow,
Since: since,
Tail: tail,
Timestamps: query.Timestamps,
}
var wg sync.WaitGroup
options.WaitGroup = &wg
logChannel := make(chan *logs.LogLine, tail+1)
if err := runtime.Log([]*libpod.Container{ctnr}, options, logChannel); err != nil {
utils.InternalServerError(w, errors.Wrapf(err, "Failed to obtain logs for Container '%s'", name))
return
}
go func() {
wg.Wait()
close(logChannel)
}()
w.WriteHeader(http.StatusOK)
var frame strings.Builder
header := make([]byte, 8)
for ok := true; ok; ok = query.Follow {
for line := range logChannel {
if _, found := r.URL.Query()["until"]; found {
if line.Time.After(until) {
break
}
}
// Reset buffer we're ready to loop again
frame.Reset()
switch line.Device {
case "stdout":
if !query.Stdout {
continue
}
header[0] = 1
case "stderr":
if !query.Stderr {
continue
}
header[0] = 2
default:
// Logging and moving on is the best we can do here. We may have already sent
// a Status and Content-Type to client therefore we can no longer report an error.
log.Infof("unknown Device type '%s' in log file from Container %s", line.Device, ctnr.ID())
continue
}
if query.Timestamps {
frame.WriteString(line.Time.Format(time.RFC3339))
frame.WriteString(" ")
}
frame.WriteString(line.Msg)
binary.BigEndian.PutUint32(header[4:], uint32(frame.Len()))
if _, err := w.Write(header[0:8]); err != nil {
log.Errorf("unable to write log output header: %q", err)
}
if _, err := io.WriteString(w, frame.String()); err != nil {
log.Errorf("unable to write frame string: %q", err)
}
if flusher, ok := w.(http.Flusher); ok {
flusher.Flush()
}
}
}
}
|
