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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
package server
import (
"context"
"net"
"net/http"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/pkg/api/handlers"
"github.com/coreos/go-systemd/activation"
"github.com/gorilla/mux"
"github.com/gorilla/schema"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
type APIServer struct {
http.Server // The HTTP work happens here
*schema.Decoder // Decoder for Query parameters to structs
context.Context // Context to carry objects to handlers
*libpod.Runtime // Where the real work happens
net.Listener // mux for routing HTTP API calls to libpod routines
context.CancelFunc // Stop APIServer
*time.Timer // Hold timer for sliding window
time.Duration // Duration of client access sliding window
}
// Number of seconds to wait for next request, if exceeded shutdown server
const (
DefaultServiceDuration = 300 * time.Second
UnlimitedServiceDuration = 0 * time.Second
)
// NewServer will create and configure a new API server with all defaults
func NewServer(runtime *libpod.Runtime) (*APIServer, error) {
return newServer(runtime, DefaultServiceDuration, nil)
}
// NewServerWithSettings will create and configure a new API server using provided settings
func NewServerWithSettings(runtime *libpod.Runtime, duration time.Duration, listener *net.Listener) (*APIServer, error) {
return newServer(runtime, duration, listener)
}
func newServer(runtime *libpod.Runtime, duration time.Duration, listener *net.Listener) (*APIServer, error) {
// If listener not provided try socket activation protocol
if listener == nil {
if _, found := os.LookupEnv("LISTEN_FDS"); !found {
return nil, errors.Errorf("Cannot create Server, no listener provided and socket activation protocol is not active.")
}
listeners, err := activation.Listeners()
if err != nil {
return nil, errors.Wrap(err, "Cannot retrieve file descriptors from systemd")
}
if len(listeners) != 1 {
return nil, errors.Errorf("Wrong number of file descriptors for socket activation protocol (%d != 1)", len(listeners))
}
listener = &listeners[0]
}
router := mux.NewRouter().UseEncodedPath()
server := APIServer{
Server: http.Server{
Handler: router,
ReadHeaderTimeout: 20 * time.Second,
ReadTimeout: 20 * time.Second,
WriteTimeout: 2 * time.Minute,
},
Decoder: handlers.NewAPIDecoder(),
Context: nil,
Runtime: runtime,
Listener: *listener,
CancelFunc: nil,
Duration: duration,
}
server.Timer = time.AfterFunc(server.Duration, func() {
if err := server.Shutdown(); err != nil {
logrus.Errorf("unable to shutdown server: %q", err)
}
})
ctx, cancelFn := context.WithCancel(context.Background())
server.CancelFunc = cancelFn
// TODO: Use ConnContext when ported to go 1.13
ctx = context.WithValue(ctx, "decoder", server.Decoder)
ctx = context.WithValue(ctx, "runtime", runtime)
ctx = context.WithValue(ctx, "shutdownFunc", server.Shutdown)
server.Context = ctx
router.NotFoundHandler = http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
// We can track user errors...
logrus.Infof("Failed Request: (%d:%s) for %s:'%s'", http.StatusNotFound, http.StatusText(http.StatusNotFound), r.Method, r.URL.String())
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
},
)
for _, fn := range []func(*mux.Router) error{
server.RegisterAuthHandlers,
server.RegisterContainersHandlers,
server.RegisterDistributionHandlers,
server.registerExecHandlers,
server.RegisterEventsHandlers,
server.registerHealthCheckHandlers,
server.registerImagesHandlers,
server.registerInfoHandlers,
server.RegisterMonitorHandlers,
server.registerPingHandlers,
server.RegisterPluginsHandlers,
server.registerPodsHandlers,
server.RegisterSwarmHandlers,
server.registerSystemHandlers,
server.registerVersionHandlers,
server.registerVolumeHandlers,
} {
if err := fn(router); err != nil {
return nil, err
}
}
if logrus.IsLevelEnabled(logrus.DebugLevel) {
router.Walk(func(route *mux.Route, r *mux.Router, ancestors []*mux.Route) error { // nolint
path, err := route.GetPathTemplate()
if err != nil {
path = ""
}
methods, err := route.GetMethods()
if err != nil {
methods = []string{}
}
logrus.Debugf("Methods: %s Path: %s", strings.Join(methods, ", "), path)
return nil
})
}
return &server, nil
}
// Serve starts responding to HTTP requests
func (s *APIServer) Serve() error {
defer s.CancelFunc()
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
errChan := make(chan error, 1)
go func() {
err := s.Server.Serve(s.Listener)
if err != nil && err != http.ErrServerClosed {
errChan <- errors.Wrap(err, "Failed to start APIServer")
}
errChan <- nil
}()
select {
case err := <-errChan:
return err
case sig := <-sigChan:
logrus.Infof("APIServer terminated by signal %v", sig)
}
return nil
}
// Shutdown is a clean shutdown waiting on existing clients
func (s *APIServer) Shutdown() error {
// Duration == 0 flags no auto-shutdown of server
if s.Duration == 0 {
return nil
}
// We're still in the sliding service window
if s.Timer.Stop() {
s.Timer.Reset(s.Duration)
return nil
}
// We've been idle for the service window, really shutdown
go func() {
err := s.Server.Shutdown(s.Context)
if err != nil && err != context.Canceled {
logrus.Errorf("Failed to cleanly shutdown APIServer: %s", err.Error())
}
}()
// Wait for graceful shutdown vs. just killing connections and dropping data
<-s.Context.Done()
return nil
}
// Close immediately stops responding to clients and exits
func (s *APIServer) Close() error {
return s.Server.Close()
}
|
