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Published: Sep 18, 2021 License: MIT Imports: 12 Imported by: 0



Package cloudwatch2 emits all data as a StatisticsSet (rather than a singular Value) to CloudWatch via the aws-sdk-go-v2 SDK.



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type CloudWatch

type CloudWatch struct {
	// contains filtered or unexported fields

CloudWatch receives metrics observations and forwards them to CloudWatch. Create a CloudWatch object, use it to create metrics, and pass those metrics as dependencies to the components that will use them.

To regularly report metrics to CloudWatch, use the WriteLoop helper method.

func New

func New(namespace string, svc CloudWatchAPI, options ...Option) *CloudWatch

New returns a CloudWatch object that may be used to create metrics. Namespace is applied to all created metrics and maps to the CloudWatch namespace. Callers must ensure that regular calls to Send are performed, either manually or with one of the helper methods.

func (*CloudWatch) NewCounter

func (cw *CloudWatch) NewCounter(name string) metrics.Counter

NewCounter returns a counter. Observations are aggregated and emitted once per write invocation.

func (*CloudWatch) NewGauge

func (cw *CloudWatch) NewGauge(name string) metrics.Gauge

NewGauge returns an gauge. Under the covers, there is no distinctions in CloudWatch for how Counters/Histograms/Gauges are reported, so this just wraps a cloudwatch2.Counter.

func (*CloudWatch) NewHistogram

func (cw *CloudWatch) NewHistogram(name string) metrics.Histogram

NewHistogram returns a histogram. Under the covers, there is no distinctions in CloudWatch for how Counters/Histograms/Gauges are reported, so this just wraps a cloudwatch2.Counter.

func (*CloudWatch) Send

func (cw *CloudWatch) Send() error

Send will fire an API request to CloudWatch with the latest stats for all metrics. It is preferred that the WriteLoop method is used.

func (*CloudWatch) WriteLoop

func (cw *CloudWatch) WriteLoop(ctx context.Context, c <-chan time.Time)

WriteLoop is a helper method that invokes Send every time the passed channel fires. This method blocks until ctx is canceled, so clients probably want to run it in its own goroutine. For typical usage, create a time.Ticker and pass its C channel to this method.

type CloudWatchAPI added in v0.11.0

type CloudWatchAPI interface {
	PutMetricData(ctx context.Context, params *cloudwatch.PutMetricDataInput, optFns ...func(*cloudwatch.Options)) (*cloudwatch.PutMetricDataOutput, error)

CloudWatchAPI is an interface that defines the set of Amazon CloudWatch API operations required by CloudWatch.

type Counter

type Counter struct {
	// contains filtered or unexported fields

Counter is a counter. Observations are forwarded to a node object, and aggregated per timeseries.

func (*Counter) Add

func (c *Counter) Add(delta float64)

Add implements metrics.Counter.

func (*Counter) With

func (c *Counter) With(labelValues ...string) metrics.Counter

With implements metrics.Counter.

type Option

type Option func(*CloudWatch)

Option is a function adapter to change config of the CloudWatch struct

func WithConcurrentRequests

func WithConcurrentRequests(n int) Option

WithConcurrentRequests sets the upper limit on how many cloudwatch.PutMetricDataRequest may be under way at any given time. If n is greater than 20, 20 is used. By default, the max is set at 10 concurrent requests.

func WithLogger

func WithLogger(logger log.Logger) Option

WithLogger sets the Logger that will receive error messages generated during the WriteLoop. By default, no logger is used.

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