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Merge pull request #464 from weaveworks/cloud-watch-metrics
pkg/metrics/providers: add AWS CloudWatch provider
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| package providers | ||
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| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "net/http" | ||
| "time" | ||
|
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||
| "github.com/aws/aws-sdk-go/aws" | ||
| "github.com/aws/aws-sdk-go/aws/awserr" | ||
| "github.com/aws/aws-sdk-go/aws/session" | ||
| "github.com/aws/aws-sdk-go/service/cloudwatch" | ||
|
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| flaggerv1 "github.com/weaveworks/flagger/pkg/apis/flagger/v1beta1" | ||
| ) | ||
|
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| const ( | ||
| cloudWatchMaxRetries = 3 | ||
| cloudWatchStartDeltaMultiplierOnMetricInterval = 10 | ||
| ) | ||
|
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| type CloudWatchProvider struct { | ||
| client cloudWatchClient | ||
| startDelta time.Duration | ||
| } | ||
|
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| // for the testing purpose | ||
| type cloudWatchClient interface { | ||
| GetMetricData(input *cloudwatch.GetMetricDataInput) (*cloudwatch.GetMetricDataOutput, error) | ||
| } | ||
|
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| // NewCloudWatchProvider takes a metricInterval, a provider spec and the credentials map, and | ||
| // returns a cloudWatchProvider ready to execute queries against the AWS CloudWatch metrics | ||
| func NewCloudWatchProvider(metricInterval string, provider flaggerv1.MetricTemplateProvider) (*CloudWatchProvider, error) { | ||
| if provider.Region == "" { | ||
| return nil, fmt.Errorf("region not specified") | ||
| } | ||
|
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| sess, err := session.NewSession(aws.NewConfig(). | ||
| WithRegion(provider.Region).WithMaxRetries(cloudWatchMaxRetries)) | ||
|
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| if err != nil { | ||
| return nil, fmt.Errorf("error creating aws session: %s", err.Error()) | ||
| } | ||
|
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| md, err := time.ParseDuration(metricInterval) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error parsing metric interval: %s", err.Error()) | ||
| } | ||
|
|
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| return &CloudWatchProvider{ | ||
| client: cloudwatch.New(sess), | ||
| startDelta: cloudWatchStartDeltaMultiplierOnMetricInterval * md, | ||
| }, err | ||
| } | ||
|
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| // RunQuery executes the aws cloud watch metrics query against GetMetricData endpoint | ||
| // and returns the the first result as float64 | ||
| func (p *CloudWatchProvider) RunQuery(query string) (float64, error) { | ||
| var cq []*cloudwatch.MetricDataQuery | ||
| if err := json.Unmarshal([]byte(query), &cq); err != nil { | ||
| return 0, fmt.Errorf("error unmarshaling query: %s", err.Error()) | ||
| } | ||
|
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| end := time.Now() | ||
| start := end.Add(-p.startDelta) | ||
| res, err := p.client.GetMetricData(&cloudwatch.GetMetricDataInput{ | ||
| EndTime: aws.Time(end), | ||
| MaxDatapoints: aws.Int64(20), | ||
| StartTime: aws.Time(start), | ||
| MetricDataQueries: cq, | ||
| }) | ||
|
|
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| if err != nil { | ||
| return 0, fmt.Errorf("error requesting cloudwatch: %s", err.Error()) | ||
| } | ||
|
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| mr := res.MetricDataResults | ||
| if len(mr) < 1 { | ||
| return 0, fmt.Errorf("no values found in response: %s", res.String()) | ||
| } | ||
|
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| vs := res.MetricDataResults[0].Values | ||
| if len(vs) < 1 { | ||
| return 0, fmt.Errorf("no values found in response: %s", res.String()) | ||
| } | ||
|
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| return aws.Float64Value(vs[0]), nil | ||
| } | ||
|
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| // IsOnline calls GetMetricData endpoint with the empty query | ||
| // and returns an error if the returned status code is NOT http.StatusBadRequests. | ||
| // For example, if the flagger does not have permission to perform `cloudwatch:GetMetricData`, | ||
| // the returned status code would be http.StatusForbidden | ||
| func (p *CloudWatchProvider) IsOnline() (bool, error) { | ||
| _, err := p.client.GetMetricData(&cloudwatch.GetMetricDataInput{ | ||
| EndTime: aws.Time(time.Time{}), | ||
| MetricDataQueries: []*cloudwatch.MetricDataQuery{}, | ||
| StartTime: aws.Time(time.Time{}), | ||
| }) | ||
|
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| if err == nil { | ||
| return true, nil | ||
| } | ||
|
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| ae, ok := err.(awserr.RequestFailure) | ||
| if !ok { | ||
| return false, fmt.Errorf("unexpected error: %v", err) | ||
| } else if ae.StatusCode() != http.StatusBadRequest { | ||
| return false, fmt.Errorf("unexpected status code: %v", ae) | ||
| } | ||
| return true, nil | ||
| } |
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