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Refactor metrics/cloudwatch #1202

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merged 2 commits into from
Nov 23, 2021
Merged

Refactor metrics/cloudwatch #1202

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4801a9b
Refactor metrics/cloudwatch:
sina-devel Nov 21, 2021
af8d701
Remove the `apply` method
sina-devel Nov 21, 2021
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32 changes: 14 additions & 18 deletions metrics/cloudwatch/cloudwatch.go
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Original file line number Diff line number Diff line change
Expand Up @@ -23,11 +23,6 @@ const (
maxValuesInABatch = 150
)

type Percentiles []struct {
s string
f float64
}

// 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.
Expand All @@ -46,15 +41,12 @@ type CloudWatch struct {
numConcurrentRequests int
}

type option func(*CloudWatch)

func (s *CloudWatch) apply(opt option) {
if opt != nil {
opt(s)
}
}
// Option is a function adapter to change config of the CloudWatch struct
type Option func(*CloudWatch)

func WithLogger(logger log.Logger) option {
// WithLogger sets the Logger that will receive error messages generated
// during the WriteLoop. By default, fmt logger is used.
func WithLogger(logger log.Logger) Option {
return func(c *CloudWatch) {
c.logger = logger
}
Expand All @@ -64,7 +56,7 @@ func WithLogger(logger log.Logger) option {
// existing/default values.
// Reason is that Cloudwatch makes you pay per metric, so you can save half the money
// by only using 2 metrics instead of the default 4.
func WithPercentiles(percentiles ...float64) option {
func WithPercentiles(percentiles ...float64) Option {
return func(c *CloudWatch) {
c.percentiles = make([]float64, 0, len(percentiles))
for _, p := range percentiles {
Expand All @@ -76,7 +68,11 @@ func WithPercentiles(percentiles ...float64) option {
}
}

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 WithConcurrentRequests(n int) Option {
return func(c *CloudWatch) {
if n > maxConcurrentRequests {
n = maxConcurrentRequests
Expand All @@ -89,7 +85,7 @@ func WithConcurrentRequests(n int) option {
// 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 New(namespace string, svc cloudwatchiface.CloudWatchAPI, options ...option) *CloudWatch {
func New(namespace string, svc cloudwatchiface.CloudWatchAPI, options ...Option) *CloudWatch {
cw := &CloudWatch{
sem: nil, // set below
namespace: namespace,
Expand All @@ -102,8 +98,8 @@ func New(namespace string, svc cloudwatchiface.CloudWatchAPI, options ...option)
percentiles: []float64{0.50, 0.90, 0.95, 0.99},
}

for _, optFunc := range options {
optFunc(cw)
for _, opt := range options {
opt(cw)
}

cw.sem = make(chan struct{}, cw.numConcurrentRequests)
Expand Down