/
main_message.go
127 lines (107 loc) · 3.89 KB
/
main_message.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
/*
Copyright 2020 The Knative Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package adapter
import (
"context"
"flag"
"log"
"net/http"
"time"
"github.com/kelseyhightower/envconfig"
"go.opencensus.io/stats/view"
"go.uber.org/zap"
"knative.dev/eventing/pkg/metrics/source"
"knative.dev/pkg/apis"
duckv1 "knative.dev/pkg/apis/duck/v1"
"knative.dev/pkg/logging"
"knative.dev/pkg/metrics"
"knative.dev/pkg/profiling"
"knative.dev/pkg/signals"
)
type MessageAdapter interface {
Start(ctx context.Context) error
}
type MessageAdapterConstructor func(ctx context.Context, env EnvConfigAccessor, sink duckv1.Addressable, reporter source.StatsReporter) MessageAdapter
func MainMessageAdapter(component string, ector EnvConfigConstructor, ctor MessageAdapterConstructor) {
MainMessageAdapterWithContext(signals.NewContext(), component, ector, ctor)
}
func MainMessageAdapterWithContext(ctx context.Context, component string, ector EnvConfigConstructor, ctor MessageAdapterConstructor) {
flag.Parse()
env := ector()
if err := envconfig.Process("", env); err != nil {
log.Fatalf("Error processing env var: %s", err)
}
// Retrieve the logger from the env
logger := env.GetLogger()
defer flush(logger)
ctx = logging.WithLogger(ctx, logger)
// Report stats on Go memory usage every 30 seconds.
msp := metrics.NewMemStatsAll()
msp.Start(ctx, 30*time.Second)
if err := view.Register(msp.DefaultViews()...); err != nil {
logger.Fatal("Error exporting go memstats view: %v", zap.Error(err))
}
// Convert json metrics.ExporterOptions to metrics.ExporterOptions.
metricsConfig, err := env.GetMetricsConfig()
if err != nil {
logger.Error("failed to process metrics options", zap.Error(err))
} else {
if err := metrics.UpdateExporter(ctx, *metricsConfig, logger); err != nil {
logger.Error("failed to create the metrics exporter", zap.Error(err))
}
}
// Check if metrics config contains profiling flag
if metricsConfig != nil && metricsConfig.ConfigMap != nil {
if enabled, err := profiling.ReadProfilingFlag(metricsConfig.ConfigMap); err == nil {
if enabled {
// Start a goroutine to server profiling metrics
logger.Info("Profiling enabled")
go func() {
server := profiling.NewServer(profiling.NewHandler(logger, true))
// Don't forward ErrServerClosed as that indicates we're already shutting down.
if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
logger.Error("profiling server failed", zap.Error(err))
}
}()
}
} else {
logger.Error("error while reading profiling flag", zap.Error(err))
}
}
reporter, err := source.NewStatsReporter()
if err != nil {
logger.Error("error building statsreporter", zap.Error(err))
}
// Retrieve tracing config
tracer, err := env.SetupTracing(logger)
if err != nil {
// If tracing doesn't work, we will log an error, but allow the adapter
// to continue to start.
logger.Error("Error setting up trace publishing", zap.Error(err))
}
defer tracer.Shutdown(context.Background())
sinkURL, err := apis.ParseURL(env.GetSink())
if err != nil {
logger.Fatal("error parsing sink URL", zap.Error(err))
}
sink := duckv1.Addressable{
URL: sinkURL,
CACerts: env.GetCACerts(),
}
// Configuring the adapter
adapter := ctor(ctx, env, sink, reporter)
// Finally start the adapter (blocking)
if err := adapter.Start(ctx); err != nil {
logging.FromContext(ctx).Warn("Start returned an error", zap.Error(err))
}
}