-
Notifications
You must be signed in to change notification settings - Fork 4.2k
/
util.go
227 lines (197 loc) · 6.42 KB
/
util.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
// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 load
import (
"context"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"reflect"
"strings"
"time"
"github.com/apache/beam/sdks/v2/go/pkg/beam"
"github.com/apache/beam/sdks/v2/go/pkg/beam/core/metrics"
)
const (
runtimeMetricNamespace = "RuntimeMonitor"
runtimeMetricName = "runtime"
)
var (
influxMeasurement = flag.String(
"influx_measurement",
"",
`An InfluxDB measurement where metrics should be published to.
If empty, no metrics will be send to InfluxDB.`)
influxDatabase = flag.String(
"influx_db_name",
"",
"InfluxDB database name. If empty, no metrics will be send to InfluxDB.")
influxHost = flag.String(
"influx_hostname",
"http://localhost:8086",
"Hostname and port to connect to InfluxDB. Defaults to http://localhost:8086.")
influxNamespace = flag.String(
"influx_namespace",
"",
`A namespace to be used when constructing InfluxDB's data points.
Used to make some points different from others within the same measurement.`)
runtime = beam.NewDistribution(runtimeMetricNamespace, runtimeMetricName)
)
func init() {
beam.RegisterType(reflect.TypeOf((*RuntimeMonitor)(nil)).Elem())
}
// RuntimeMonitor is a DoFn to record processing time in the pipeline.
//
// It uses a distribution metric which is updated every time a new bundle
// starts or finishes. The processing time can be extracted by calculating
// the difference of the maximum and the minimum value of the distribution
// metric.
type RuntimeMonitor struct{}
// StartBundle updates a distribution metric.
func (fn *RuntimeMonitor) StartBundle(ctx context.Context, emit func([]byte, []byte)) {
runtime.Update(ctx, time.Now().UnixNano())
}
// FinishBundle updates a distribution metric.
func (fn *RuntimeMonitor) FinishBundle(ctx context.Context, emit func([]byte, []byte)) {
runtime.Update(ctx, time.Now().UnixNano())
}
// ProcessElement emits unmodified input elements.
func (fn *RuntimeMonitor) ProcessElement(key, value []byte, emit func([]byte, []byte)) {
emit(key, value)
}
type influxDBOptions struct {
measurement string
dbName string
hostname string
user string
password string
}
func newInfluxDBOptions() *influxDBOptions {
return &influxDBOptions{
measurement: *influxMeasurement,
dbName: *influxDatabase,
hostname: *influxHost,
user: os.Getenv("INFLUXDB_USER"),
password: os.Getenv("INFLUXDB_USER_PASSWORD")}
}
func (options influxDBOptions) validate() bool {
return options.measurement != "" && options.dbName != ""
}
func (options influxDBOptions) httpAuthEnabled() bool {
return options.user != "" && options.password != ""
}
// loadTestResult represents a single data record that has: a timestamp,
// a type of a metric, and a value.
type loadTestResult struct {
timestamp int64
metric string
value float64
}
func newLoadTestResult(value float64) loadTestResult {
metric := ""
if *influxNamespace == "" {
metric = runtimeMetricName
} else {
metric = fmt.Sprintf("%v_%v", *influxNamespace, runtimeMetricName)
}
return loadTestResult{timestamp: time.Now().Unix(), metric: metric, value: value}
}
// PublishMetrics calculates the runtime and sends the result to InfluxDB database.
func PublishMetrics(results metrics.QueryResults) {
options := newInfluxDBOptions()
if options.validate() {
if res := toLoadTestResults(results); len(res) > 0 {
publishMetricstoInfluxDB(options, toLoadTestResults(results))
}
} else {
log.Print("Missing InfluxDB options. Metrics will not be published to InfluxDB")
}
}
func toLoadTestResults(results metrics.QueryResults) []loadTestResult {
res := make([]loadTestResult, 0)
matched := make([]metrics.DistributionResult, 0)
for _, dist := range results.Distributions() {
if dist.Key.Namespace == runtimeMetricNamespace &&
dist.Key.Name == runtimeMetricName {
matched = append(matched, dist)
}
}
if len(matched) > 0 {
res = append(res, newLoadTestResult(extractRuntimeValue(matched)))
}
return res
}
// extractRuntimeValue returns a difference between the maximum of maximum
// values and the minimum of minimum values in seconds.
func extractRuntimeValue(dists []metrics.DistributionResult) float64 {
min := dists[0].Result().Min
max := min
for _, dist := range dists {
res := dist.Result()
if min > res.Min {
min = res.Min
}
if max < res.Max {
max = res.Max
}
}
return float64(max-min) / float64(time.Second)
}
func publishMetricstoInfluxDB(options *influxDBOptions, results []loadTestResult) {
url := fmt.Sprintf("%v/write", options.hostname)
payload := buildPayload(options, results)
request, err := http.NewRequest("POST", url, strings.NewReader(payload))
if err != nil {
log.Print(err)
return
}
query := request.URL.Query()
query.Add("db", options.dbName)
query.Add("precision", "s")
request.URL.RawQuery = query.Encode()
if options.httpAuthEnabled() {
request.SetBasicAuth(options.user, options.password)
}
client := &http.Client{}
resp, err := client.Do(request)
if err != nil {
log.Print(err)
return
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Print(err)
return
}
if resp.StatusCode != 204 {
jsonData := make(map[string]string)
json.Unmarshal(body, &jsonData)
log.Print(fmt.Errorf("Failed to publish metrics to InfluxDB. Received status code %v "+
"with an error message: %v", resp.StatusCode, jsonData["error"]))
}
}
func buildPayload(options *influxDBOptions, results []loadTestResult) string {
points := make([]string, len(results))
for i, result := range results {
points[i] = fmt.Sprintf("%v,metric=%v value=%f %d", options.measurement,
result.metric, result.value, result.timestamp)
}
return strings.Join(points, "\n")
}