forked from jekyang/heapster
/
heapster.go
135 lines (122 loc) · 3.76 KB
/
heapster.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
// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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 main
import (
"flag"
"fmt"
"net/http"
"os"
"runtime"
"strings"
"time"
"github.com/GoogleCloudPlatform/heapster/sinks"
"github.com/GoogleCloudPlatform/heapster/sources"
"github.com/GoogleCloudPlatform/heapster/validate"
"github.com/GoogleCloudPlatform/heapster/version"
"github.com/golang/glog"
)
var (
argPollDuration = flag.Duration("poll_duration", 10*time.Second, "Polling duration")
argPort = flag.Int("port", 8082, "port to listen")
argIp = flag.String("listen_ip", "", "IP to listen on, defaults to all IPs")
argMaxProcs = flag.Int("max_procs", 0, "max number of CPUs that can be used simultaneously. Less than 1 for default (number of cores).")
)
func main() {
defer glog.Flush()
flag.Parse()
setMaxProcs()
glog.Infof(strings.Join(os.Args, " "))
glog.Infof("Heapster version %v", version.HeapsterVersion)
glog.Infof("Flags: %s", strings.Join(getFlags(), " "))
if err := validateFlags(); err != nil {
glog.Fatal(err)
}
source, sink, err := doWork()
if err != nil {
glog.Error(err)
os.Exit(1)
}
setupHandlers(source, sink)
addr := fmt.Sprintf("%s:%d", *argIp, *argPort)
glog.Infof("Starting heapster on port %d", *argPort)
glog.Fatal(http.ListenAndServe(addr, nil))
os.Exit(0)
}
func getFlags() []string {
flagData := []string{}
flag.VisitAll(func(flag *flag.Flag) {
flagData = append(flagData, fmt.Sprintf("%s='%v'", flag.Name, flag.Value))
})
return flagData
}
func validateFlags() error {
if *argPollDuration <= time.Second {
return fmt.Errorf("poll duration is invalid '%d'. Set it to a duration greater than a second", *argPollDuration)
}
return nil
}
func setupHandlers(source sources.Source, sink sinks.ExternalSinkManager) {
// Validation/Debug handler.
http.HandleFunc(validate.ValidatePage, func(w http.ResponseWriter, r *http.Request) {
err := validate.HandleRequest(w, source, sink)
if err != nil {
fmt.Fprintf(w, "%s", err)
}
})
// TODO(jnagal): Add a main status page.
http.Handle("/", http.RedirectHandler(validate.ValidatePage, http.StatusTemporaryRedirect))
}
func doWork() (sources.Source, sinks.ExternalSinkManager, error) {
source, err := sources.NewSource(*argPollDuration)
if err != nil {
return nil, nil, err
}
sink, err := sinks.NewSink()
if err != nil {
return nil, nil, err
}
go housekeep(source, sink)
return source, sink, nil
}
func housekeep(source sources.Source, sink sinks.ExternalSinkManager) {
ticker := time.NewTicker(*argPollDuration)
defer ticker.Stop()
for {
select {
case <-ticker.C:
data, err := source.GetInfo()
if err != nil {
glog.Errorf("failed to get information from source - %v", err)
}
if err := sink.Store(data); err != nil {
glog.Errorf("failed to push information to sink - %v", err)
}
}
}
}
func setMaxProcs() {
// Allow as many threads as we have cores unless the user specified a value.
var numProcs int
if *argMaxProcs < 1 {
numProcs = runtime.NumCPU()
} else {
numProcs = *argMaxProcs
}
runtime.GOMAXPROCS(numProcs)
// Check if the setting was successful.
actualNumProcs := runtime.GOMAXPROCS(0)
if actualNumProcs != numProcs {
glog.Warningf("Specified max procs of %d but using %d", numProcs, actualNumProcs)
}
}