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aws.go
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aws.go
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/*
* Copyright 2023 RapidLoop, Inc.
*
* 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 collector
import (
"encoding/json"
"errors"
"fmt"
"sort"
"strconv"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/cloudwatch"
"github.com/aws/aws-sdk-go/service/cloudwatchlogs"
"github.com/aws/aws-sdk-go/service/rds"
"github.com/rapidloop/pgmetrics"
)
type awsCollector struct {
sess *session.Session
}
func newAwsCollector() (*awsCollector, error) {
sess, err := session.NewSessionWithOptions(session.Options{
SharedConfigState: session.SharedConfigEnable,
})
if err != nil {
return nil, err
}
return &awsCollector{sess: sess}, nil
}
func (ac *awsCollector) collect(dbid string, out *pgmetrics.RDS) (err error) {
// describe the db instance
rdssvc := rds.New(ac.sess)
dbinsts, err := rdssvc.DescribeDBInstances(&rds.DescribeDBInstancesInput{
DBInstanceIdentifier: aws.String(dbid),
})
if err != nil {
return
}
if len(dbinsts.DBInstances) != 1 {
err = fmt.Errorf("failed to locate database instance %q", dbid)
return
}
// get resource ID and see if enhanced monitoring is enabled
dbinst := dbinsts.DBInstances[0]
dbirid := *dbinst.DbiResourceId
emEnabled := *dbinst.MonitoringInterval > 0
// list available metrics
cwsvc := cloudwatch.New(ac.sess)
avmetrics, err := cwsvc.ListMetrics(&cloudwatch.ListMetricsInput{
Namespace: aws.String("AWS/RDS"),
Dimensions: []*cloudwatch.DimensionFilter{
{
Name: aws.String("DBInstanceIdentifier"),
Value: aws.String(dbid),
},
},
})
if err != nil {
err = fmt.Errorf("failed to list CloudWatch metrics: %v", err)
return
}
// form query input
names := make([]string, len(avmetrics.Metrics))
queries := make([]*cloudwatch.MetricDataQuery, len(avmetrics.Metrics))
for i, m := range avmetrics.Metrics {
names[i] = *m.MetricName
queries[i] = &cloudwatch.MetricDataQuery{
Id: aws.String(fmt.Sprintf("id%d", i)),
MetricStat: &cloudwatch.MetricStat{
Metric: &cloudwatch.Metric{
Dimensions: []*cloudwatch.Dimension{
{
Name: aws.String("DBInstanceIdentifier"),
Value: aws.String(dbid),
},
},
MetricName: aws.String(names[i]),
Namespace: aws.String("AWS/RDS"),
},
Period: aws.Int64(60),
Stat: aws.String("Average"),
},
}
}
to := time.Now()
from := to.Add(-5 * time.Minute)
input := &cloudwatch.GetMetricDataInput{
StartTime: aws.Time(from),
EndTime: aws.Time(to),
ScanBy: aws.String("TimestampDescending"),
MetricDataQueries: queries,
}
// actually get metrics
err = cwsvc.GetMetricDataPages(input, func(page *cloudwatch.GetMetricDataOutput, lastPage bool) bool {
for _, r := range page.MetricDataResults {
if len(r.Timestamps) >= 1 && len(r.Values) >= 1 {
if id, err := strconv.Atoi(strings.TrimPrefix(*r.Id, "id")); err == nil && id >= 0 && id < len(names) {
name := names[id]
val := *r.Values[0]
if len(out.Basic) == 0 {
out.Basic = map[string]float64{name: val}
} else {
out.Basic[name] = val
}
}
}
}
return true
})
if err != nil {
err = fmt.Errorf("failed to get CloudWatch metric data: %v", err)
return
}
// if enhanced monitoring is not enabled, we are done
if !emEnabled {
return
}
// get last log event
cwlsvc := cloudwatchlogs.New(ac.sess)
events, err := cwlsvc.GetLogEvents(&cloudwatchlogs.GetLogEventsInput{
EndTime: aws.Int64(time.Now().Unix() * 1000),
Limit: aws.Int64(1),
LogGroupName: aws.String("RDSOSMetrics"),
LogStreamName: aws.String(dbirid),
StartFromHead: aws.Bool(false),
})
if err != nil {
err = fmt.Errorf("failed to get CloudWatchLog events: %v", err)
return
}
if len(events.Events) == 0 || events.Events[0].Message == nil || len(*events.Events[0].Message) == 0 {
return // didn't find any usable event, ignore
}
if err = json.Unmarshal([]byte(*events.Events[0].Message), &out.Enhanced); err != nil {
err = fmt.Errorf("failed to decode event: %v", err)
return
}
return
}
func (ac *awsCollector) collectLogs(dbid string, start time.Time, cb func(lines []byte)) (err error) {
if len(dbid) == 0 || cb == nil {
return errors.New("internal error, bad input")
}
type logFilesType struct {
name string
last time.Time
}
// describe db log files
rdssvc := rds.New(ac.sess)
input := &rds.DescribeDBLogFilesInput{
DBInstanceIdentifier: aws.String(dbid),
FileLastWritten: aws.Int64(start.Unix() * 1000),
}
var logFiles []logFilesType
err = rdssvc.DescribeDBLogFilesPages(input, func(page *rds.DescribeDBLogFilesOutput, lastPage bool) bool {
if page == nil {
return false // should not happen
}
for _, d := range page.DescribeDBLogFiles {
if d != nil && d.LastWritten != nil && d.LogFileName != nil {
logFiles = append(logFiles, logFilesType{
name: *d.LogFileName,
last: time.Unix(*d.LastWritten/1000, *d.LastWritten%1000),
})
}
}
return true
})
if err != nil {
err = fmt.Errorf("failed to DescribeDBLogFilesPages: %v", err)
return
}
// sort the log files, oldest first
sort.SliceStable(logFiles, func(i, j int) bool {
return logFiles[i].last.Before(logFiles[j].last)
})
// download db log file portion
for _, lf := range logFiles {
marker := "0"
done := false
var lines []byte
for !done {
output, err := rdssvc.DownloadDBLogFilePortion(
&rds.DownloadDBLogFilePortionInput{
DBInstanceIdentifier: aws.String(dbid),
LogFileName: aws.String(lf.name),
Marker: aws.String(marker),
},
)
if err != nil {
return fmt.Errorf("failed to DownloadDBLogFilePortionPages: %v", err)
}
if output == nil || output.LogFileData == nil || output.Marker == nil ||
output.AdditionalDataPending == nil {
break // should not happen
}
lines = append(lines, []byte(*output.LogFileData)...)
marker = *output.Marker
done = !*output.AdditionalDataPending
}
if len(lines) > 0 {
cb(lines)
}
}
return nil
}