-
Notifications
You must be signed in to change notification settings - Fork 14
/
http.go
361 lines (302 loc) · 9.75 KB
/
http.go
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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
package server
import (
"context"
"fmt"
"log"
"net"
"net/http"
"strings"
"time"
"github.com/sirupsen/logrus"
"go.opentelemetry.io/otel/metric/instrument"
"go.opentelemetry.io/otel/metric/unit"
"github.com/avenga/couper/config"
"github.com/avenga/couper/config/env"
"github.com/avenga/couper/config/request"
"github.com/avenga/couper/config/runtime"
"github.com/avenga/couper/errors"
"github.com/avenga/couper/eval"
"github.com/avenga/couper/handler"
"github.com/avenga/couper/handler/middleware"
"github.com/avenga/couper/logging"
"github.com/avenga/couper/telemetry/instrumentation"
"github.com/avenga/couper/telemetry/provider"
)
type muxers map[string]*Mux
// HTTPServer represents a configured HTTP server.
type HTTPServer struct {
commandCtx context.Context
evalCtx *eval.Context
listener net.Listener
log logrus.FieldLogger
muxers muxers
port string
settings *config.Settings
shutdownCh chan struct{}
srv *http.Server
timings *runtime.HTTPTimings
}
// NewServers returns a list of the created and configured HTTP(s) servers.
func NewServers(cmdCtx, evalCtx context.Context, log logrus.FieldLogger, settings *config.Settings,
timings *runtime.HTTPTimings, srvConf runtime.ServerConfiguration) ([]*HTTPServer, func(), error) {
var list []*HTTPServer
for port, hosts := range srvConf {
srv, err := New(cmdCtx, evalCtx, log, settings, timings, port, hosts)
if err != nil {
return nil, nil, err
}
list = append(list, srv)
}
handleShutdownFn := func() {
<-cmdCtx.Done()
time.Sleep(timings.ShutdownDelay + timings.ShutdownTimeout) // wait for max amount, TODO: feedback per server
}
return list, handleShutdownFn, nil
}
// New creates an HTTP(S) server with configured router and middlewares.
func New(cmdCtx, evalCtx context.Context, log logrus.FieldLogger, settings *config.Settings,
timings *runtime.HTTPTimings, p runtime.Port, hosts runtime.Hosts) (*HTTPServer, error) {
logConf := *logging.DefaultConfig
logConf.TypeFieldKey = "couper_access"
env.DecodeWithPrefix(&logConf, "ACCESS_")
shutdownCh := make(chan struct{})
muxersList := make(muxers)
var serverTLS *config.ServerTLS
for host, muxOpts := range hosts {
mux := NewMux(muxOpts)
registerHandler(mux.endpointRoot, []string{http.MethodGet}, settings.HealthPath, handler.NewHealthCheck(settings.HealthPath, shutdownCh))
muxersList[host] = mux
// TODO: refactor (hosts,muxOpts, etc) format type and usage
// serverOpts are all the same, pick first
if serverTLS == nil && muxOpts.ServerOptions != nil && muxOpts.ServerOptions.TLS != nil {
serverTLS = muxOpts.ServerOptions.TLS
}
}
httpSrv := &HTTPServer{
evalCtx: evalCtx.Value(request.ContextType).(*eval.Context),
commandCtx: cmdCtx,
log: log,
muxers: muxersList,
port: p.String(),
settings: settings,
shutdownCh: shutdownCh,
timings: timings,
}
accessLog := logging.NewAccessLog(&logConf, log)
// order matters
traceHandler := middleware.NewTraceHandler()(httpSrv)
uidHandler := middleware.NewUIDHandler(settings, httpsDevProxyIDField)(traceHandler)
logHandler := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
uidHandler.ServeHTTP(rw, req)
accessLog.Do(rw, req)
})
recordHandler := middleware.NewRecordHandler(settings.SecureCookies)(logHandler)
startTimeHandler := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
recordHandler.ServeHTTP(rw, r.WithContext(
context.WithValue(r.Context(), request.StartTime, time.Now())))
})
srv := &http.Server{
Addr: ":" + p.String(),
ConnState: httpSrv.onConnState,
ErrorLog: newErrorLogWrapper(log),
Handler: startTimeHandler,
IdleTimeout: timings.IdleTimeout,
ReadHeaderTimeout: timings.ReadHeaderTimeout,
}
if serverTLS != nil {
tlsConfig, err := newTLSConfig(serverTLS, log)
if err != nil {
return nil, err
}
srv.TLSConfig = tlsConfig
}
httpSrv.srv = srv
return httpSrv, nil
}
// Addr returns the listener address.
func (s *HTTPServer) Addr() string {
if s.listener != nil {
return s.listener.Addr().String()
}
return ""
}
// Listen initiates the configured http handler and start listing on given port.
func (s *HTTPServer) Listen() error {
if s.srv.Addr == "" {
s.srv.Addr = ":http"
if s.srv.TLSConfig != nil {
s.srv.Addr += "s"
}
}
ln, err := net.Listen("tcp4", s.srv.Addr)
if err != nil {
return err
}
s.listener = ln
s.log.Infof("couper is serving: %s", ln.Addr().String())
go s.listenForCtx()
go func() {
var serveErr error
if s.srv.TLSConfig != nil {
serveErr = s.srv.ServeTLS(s.listener, "", "")
} else {
serveErr = s.srv.Serve(ln)
}
if serveErr != nil {
if serveErr == http.ErrServerClosed {
s.log.Infof("%v: %s", serveErr, ln.Addr().String())
} else {
s.log.Errorf("%s: %v", ln.Addr().String(), serveErr)
}
}
}()
return nil
}
// Close closes the listener
func (s *HTTPServer) Close() error {
return s.listener.Close()
}
func (s *HTTPServer) listenForCtx() {
<-s.commandCtx.Done()
logFields := logrus.Fields{
"delay": s.timings.ShutdownDelay.String(),
"deadline": s.timings.ShutdownTimeout.String(),
}
s.log.WithFields(logFields).Warn("shutting down")
close(s.shutdownCh)
time.Sleep(s.timings.ShutdownDelay)
ctx := context.Background()
if s.timings.ShutdownTimeout > 0 {
c, cancel := context.WithTimeout(ctx, s.timings.ShutdownTimeout)
defer cancel()
ctx = c
}
if err := s.srv.Shutdown(ctx); err != nil {
s.log.WithFields(logFields).Error(err)
}
}
func (s *HTTPServer) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
var h http.Handler
req.Host = s.getHost(req)
host, _, err := runtime.GetHostPort(req.Host)
if err != nil {
h = errors.DefaultHTML.WithError(errors.ClientRequest)
}
mux, ok := s.muxers[host]
if !ok {
mux, ok = s.muxers["*"]
if !ok && h == nil {
h = errors.DefaultHTML.WithError(errors.Configuration)
}
}
if h == nil {
// mux.FindHandler() exchanges the req: *req = *req.WithContext(ctx)
h = mux.FindHandler(req)
}
ctx := context.WithValue(req.Context(), request.LogEntry, s.log)
ctx = context.WithValue(ctx, request.XFF, req.Header.Get("X-Forwarded-For"))
// set innermost handler name for logging purposes
if hs, stringer := getChildHandler(h).(fmt.Stringer); stringer {
ctx = context.WithValue(ctx, request.Handler, hs.String())
}
if err = s.setGetBody(h, req); err != nil {
h = mux.opts.ServerOptions.ServerErrTpl.WithError(err)
}
req.URL.Host = req.Host
req.URL.Scheme = "http"
if s.settings.AcceptsForwardedProtocol() {
if xfpr := req.Header.Get("X-Forwarded-Proto"); xfpr != "" {
req.URL.Scheme = xfpr
req.URL.Host = req.URL.Hostname()
}
}
if s.settings.AcceptsForwardedHost() {
if xfh := req.Header.Get("X-Forwarded-Host"); xfh != "" {
portToAppend := req.URL.Port()
req.URL.Host = xfh
if portToAppend != "" && req.URL.Port() == "" {
req.URL.Host += ":" + portToAppend
}
}
}
if s.settings.AcceptsForwardedPort() {
if xfpo := req.Header.Get("X-Forwarded-Port"); xfpo != "" {
req.URL.Host = req.URL.Hostname() + ":" + xfpo
}
}
// due to the middleware callee stack we have to update the 'req' value.
*req = *req.WithContext(s.evalCtx.WithClientRequest(req.WithContext(ctx)))
h.ServeHTTP(rw, req)
}
func (s *HTTPServer) setGetBody(h http.Handler, req *http.Request) error {
inner := getChildHandler(h)
var err error
if limitHandler, ok := inner.(handler.BodyLimit); ok {
err = eval.SetGetBody(req, limitHandler.BufferOptions(), limitHandler.RequestLimit())
}
return err
}
// getHost configures the host from the incoming request host based on
// the xfh setting and listener port to be prepared for the http multiplexer.
func (s *HTTPServer) getHost(req *http.Request) string {
host := req.Host
if s.settings.XForwardedHost {
if xfh := req.Header.Get("X-Forwarded-Host"); xfh != "" {
host = xfh
}
}
host = strings.ToLower(host)
if !strings.Contains(host, ":") {
return s.cleanHostAppendPort(host)
}
h, _, err := net.SplitHostPort(host)
if err != nil {
return s.cleanHostAppendPort(host)
}
return s.cleanHostAppendPort(h)
}
func (s *HTTPServer) cleanHostAppendPort(host string) string {
return strings.TrimSuffix(host, ".") + ":" + s.port
}
func (s *HTTPServer) onConnState(_ net.Conn, state http.ConnState) {
meter := provider.Meter("couper/server")
counter, _ := meter.SyncInt64().
Counter(instrumentation.ClientConnectionsTotal, instrument.WithDescription(string(unit.Dimensionless)))
gauge, _ := meter.SyncFloat64().UpDownCounter(
instrumentation.ClientConnections,
instrument.WithDescription(string(unit.Dimensionless)),
)
if state == http.StateNew {
counter.Add(context.Background(), 1)
gauge.Add(context.Background(), 1)
// we have no callback for closing a hijacked one, so count them down too.
// TODO: if required we COULD override given conn ptr value with own obj.
} else if state == http.StateClosed || state == http.StateHijacked {
gauge.Add(context.Background(), -1)
}
}
// getChildHandler returns the innermost handler which supports the Child interface.
func getChildHandler(handler http.Handler) http.Handler {
outer := handler
for {
if inner, ok := outer.(interface{ Child() http.Handler }); ok {
outer = inner.Child()
continue
}
break
}
return outer
}
// ErrorWrapper logs incoming Write bytes with the context filled logrus.FieldLogger.
type ErrorWrapper struct{ l logrus.FieldLogger }
func (e *ErrorWrapper) Write(p []byte) (n int, err error) {
msg := string(p)
if strings.HasSuffix(msg, " tls: unknown certificate") {
return len(p), nil // triggered on first browser connect for self signed certs; skip
}
e.l.Error(strings.TrimSpace(msg))
return len(p), nil
}
func newErrorLogWrapper(logger logrus.FieldLogger) *log.Logger {
return log.New(&ErrorWrapper{logger}, "", log.Lmsgprefix)
}