aboutsummaryrefslogtreecommitdiff
path: root/pkg/api/handlers/compat/containers_logs.go
blob: cb4dee4d2f6876867bb01a1725f1aa2ce86c5e1b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
package compat

import (
	"encoding/binary"
	"fmt"
	"io"
	"net/http"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/containers/podman/v3/libpod"
	"github.com/containers/podman/v3/libpod/logs"
	"github.com/containers/podman/v3/pkg/api/handlers/utils"
	"github.com/containers/podman/v3/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(r.Context(), []*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)

	writeHeader := true
	// Docker does not write stream headers iff the container has a tty.
	if !utils.IsLibpodRequest(r) {
		inspectData, err := ctnr.Inspect(false)
		if err != nil {
			utils.InternalServerError(w, errors.Wrapf(err, "failed to obtain logs for Container '%s'", name))
			return
		}
		writeHeader = !inspectData.Config.Tty
	}

	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)
		// Log lines in the compat layer require adding EOL
		// https://github.com/containers/podman/issues/8058
		if !utils.IsLibpodRequest(r) {
			frame.WriteString("\n")
		}

		if writeHeader {
			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()
		}
	}
}