-
Notifications
You must be signed in to change notification settings - Fork 4
/
instance.go
276 lines (244 loc) · 8.4 KB
/
instance.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
// Copyright © 2019 Circonus, Inc. <support@circonus.com>
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
package awsservice
import (
"context"
"fmt"
"os"
"path"
"path/filepath"
"strings"
"sync"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/circonus-labs/circonus-cloud-agent/internal/circonus"
"github.com/circonus-labs/circonus-cloud-agent/internal/config"
"github.com/circonus-labs/circonus-cloud-agent/internal/release"
"github.com/circonus-labs/circonus-cloud-agent/internal/services/awsservice/collectors"
"github.com/pkg/errors"
"github.com/rs/zerolog"
)
// Instance AWS SDK/API Instance for fetching cloudwatch metrics and forwarding them to Circonus
// Note: a Instance has a 1:1 relation with aws:circ - each Instance has (or, may have)
// a different set of aws and/or circonus credentials.
type Instance struct {
ctx context.Context
cfg *Config
regionCfg *AWSRegion
check *circonus.Check
lastStart *time.Time
collectors []collectors.Collector
baseTags circonus.Tags
logger zerolog.Logger
interval uint
period int64
sync.Mutex
running bool
}
// initInstances creates a new set of region Instances for each configuration
// file (.json,.toml,.yaml) found in the passed confDir.
func (svc *AWSService) initInstances(confDir string) error {
if confDir == "" {
return errors.New("invalid config dir (empty)")
}
entries, err := os.ReadDir(confDir)
if err != nil {
return errors.Wrap(err, "reading AWS config dir")
}
for _, entry := range entries {
entry := entry
if entry.IsDir() {
continue
}
if !strings.Contains(".json|.toml|.yaml", filepath.Ext(entry.Name())) { //nolint:gocritic
continue
}
var cfg Config
if err := config.LoadConfigFile(path.Join(confDir, entry.Name()), &cfg); err != nil {
svc.logger.Error().Err(err).Str("file", entry.Name()).Msg("loading config, skipping")
continue
}
if cfg.ID == "" {
svc.logger.Error().Str("file", entry.Name()).Msg("invalid config ID (empty), skipping")
continue
}
if strings.Contains(cfg.ID, " ") {
svc.logger.Error().Str("file", entry.Name()).Msg("invalid config ID (contains spaces), skipping")
continue
}
if len(cfg.Regions) == 0 {
svc.logger.Error().Str("file", entry.Name()).Msg("invalid config regions (empty), skipping")
}
// based on cfg.Period - collect every 1min for 'detailed' or every 5min for 'basic'
period := 300
if cfg.Period == "detailed" {
period = 60
}
// used to control how many samples we request - calculating start from
// time.Now (e.g. time.Now().Add(- (interval * time.Second))). desired
// number of samples is three. if exactly three * period is used,
// cloudwatch sdk will often respond with only the last two samples.
// so use 3 * period, plus a little extra cushion.
// interval := (period * 3) + (period / 2)
// seeing gaps, ask for more repetitive data...
interval := period
for _, regionConfig := range cfg.Regions {
regionConfig := regionConfig
instance := &Instance{
cfg: &cfg,
regionCfg: ®ionConfig,
ctx: svc.groupCtx,
interval: uint(interval),
logger: svc.logger.With().Str("id", cfg.ID).Str("region", regionConfig.Name).Logger(),
period: int64(60), // always request 60 second granularity
}
instance.logger.Debug().Str("aws_region", regionConfig.Name).Msg("initialized client instance for region")
checkConfig := &circonus.Config{
ID: fmt.Sprintf("aws_%s_%s", cfg.ID, regionConfig.Name),
DisplayName: fmt.Sprintf("aws %s %s /%s", cfg.ID, regionConfig.Name, release.NAME),
CheckBundleID: cfg.Circonus.CID,
APIKey: cfg.Circonus.Key,
APIApp: cfg.Circonus.App,
APIURL: cfg.Circonus.URL,
Debug: cfg.Circonus.Debug,
Logger: instance.logger,
Tags: fmt.Sprintf("%s:aws,aws_region:%s", release.NAME, regionConfig.Name),
}
if len(cfg.Tags) > 0 { // if top-level tags are configured, add them to check
tags := make([]string, len(cfg.Tags))
for idx, tag := range cfg.Tags {
tags[idx] = tag.Category + ":" + tag.Value
}
checkConfig.Tags += "," + strings.Join(tags, ",")
}
chk, err := circonus.NewCheck("aws", checkConfig)
if err != nil {
instance.logger.Error().Err(err).Msg("creating Circonus Check instance, skipping")
continue
}
instance.check = chk
ms, err := collectors.New(instance.ctx, instance.check, regionConfig.Services, instance.logger)
if err != nil {
instance.logger.Warn().Err(err).Msg("setting up aws metric services")
continue
}
instance.collectors = ms
svc.instances = append(svc.instances, instance)
}
}
if len(svc.instances) == 0 {
return errors.New("no valid AWS configs found")
}
return nil
}
// Start metric collections based on the configured interval - intended to be run in a goroutine (e.g. errgroup).
func (inst *Instance) Start() error {
interval := time.Duration(inst.interval) * time.Second
inst.logger.Info().Str("collection_interval", interval.String()).Msg("client started")
// fire every minute so we run at the closest proximity to the interval boundary regardless of whether
// it is 1m or 5m coupled with the duration of each individual collection run
// NOTE: ticker doesn't fire EXACTLY on boundaries (e.g. 59.9997, 3m59.9988, etc.)
ticker := time.NewTicker(1 * time.Minute)
defer ticker.Stop()
for {
select {
case <-inst.ctx.Done():
return nil
case <-ticker.C:
inst.Lock()
if inst.lastStart != nil {
elapsed := time.Since(*inst.lastStart)
if elapsed < interval {
if interval-elapsed > 2*time.Second {
inst.logger.Debug().Str("interval", interval.String()).Str("delta", elapsed.String()).Msg("interval not reached")
inst.Unlock()
continue
}
}
}
if inst.running {
inst.Unlock()
inst.logger.Warn().Msg("collection already in progress, not starting another")
continue
}
inst.logger.Debug().Str("region", inst.regionCfg.Name).Msg("setting up session")
sess, err := inst.createSession(inst.regionCfg.Name)
if err != nil {
inst.logger.Warn().Err(err).Msg("creating AWS SDK session")
inst.Unlock()
continue
}
// calculate one time series range for all requests from collectors
start := time.Now()
delta := 10 * time.Minute // get last 10 minutes of samples
if inst.lastStart != nil {
delta = start.Sub(*inst.lastStart) + interval
}
tsEnd := start
tsStart := tsEnd.Add(-delta)
inst.logger.Info().Time("start", tsStart).Time("end", tsEnd).Str("delta", delta.String()).Msg("collection time series range")
inst.lastStart = &start
inst.running = true
inst.Unlock()
timespan := collectors.MetricTimespan{
Start: tsStart,
End: tsEnd,
Period: inst.period,
}
go func() {
for _, c := range inst.collectors {
if err := c.Collect(sess, timespan, inst.baseTags); err != nil {
inst.check.ReportError(errors.WithMessage(err, fmt.Sprintf("id: %s, collector: %s", inst.cfg.ID, c.ID())))
inst.logger.Warn().Err(err).Str("collector", c.ID()).Msg("collecting telemetry")
// need to determine which errors from the various
// cloud service providers are fatal vs retry vs ???
}
if inst.done() {
break
}
}
inst.Lock()
inst.running = false
inst.Unlock()
inst.logger.Info().Str("duration", time.Since(start).String()).Msg("collection complete")
}()
}
}
}
// done is a utility routine to check the context, returns true if done.
func (inst *Instance) done() bool {
select {
case <-inst.ctx.Done():
inst.logger.Debug().Msg("context done, exiting")
return true
default:
return false
}
}
// createSession returns a new aws session using configured aws information.
func (inst *Instance) createSession(region string) (*session.Session, error) {
var cfg *aws.Config
switch {
case inst.cfg.AWS.Role != "":
creds := credentials.NewSharedCredentials(
inst.cfg.AWS.CredentialsFile,
inst.cfg.AWS.Role)
cfg = &aws.Config{Credentials: creds}
case inst.cfg.AWS.AccessKeyID != "":
creds := credentials.NewStaticCredentials(
inst.cfg.AWS.AccessKeyID,
inst.cfg.AWS.SecretAccessKey,
"")
cfg = &aws.Config{Credentials: creds}
default:
cfg = &aws.Config{}
}
if region != "" && region != "global" {
cfg.Region = aws.String(region)
}
return session.NewSession(cfg)
}