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package metrics
type handlerFactoryConfig struct {
namespace string
subsystem string
requestDurationBuckets []float64
timeToWriteHeaderDurationBuckets []float64
byteSizeBuckets []float64
labels []string
}
// HandlerFactoryOption is used to pass options in NewHandlerFactory.
type HandlerFactoryOption func(*handlerFactoryConfig)
func applyHandlerFactoryOptions(opts []HandlerFactoryOption) handlerFactoryConfig {
config := handlerFactoryConfig{
subsystem: "http",
requestDurationBuckets: []float64{
0.005, /* 5ms */
0.025, /* 25ms */
0.1, /* 100ms */
0.5, /* 500ms */
1.0, /* 1s */
10.0, /* 10s */
30.0, /* 30s */
60.0, /* 1m */
300.0, /* 5m */
},
timeToWriteHeaderDurationBuckets: []float64{
0.005, /* 5ms */
0.025, /* 25ms */
0.1, /* 100ms */
0.5, /* 500ms */
1.0, /* 1s */
10.0, /* 10s */
30.0, /* 30s */
},
byteSizeBuckets: []float64{
10,
64,
256,
1024, /* 1KiB */
64 * 1024, /* 64KiB */
256 * 1024, /* 256KiB */
1024 * 1024, /* 1MiB */
64 * 1024 * 1024, /* 64MiB */
},
labels: []string{"code", "method"},
}
for _, v := range opts {
v(&config)
}
return config
}
// WithNamespace will configure the namespace to apply to the metrics.
func WithNamespace(namespace string) HandlerFactoryOption {
return func(config *handlerFactoryConfig) {
config.namespace = namespace
}
}
// WithLabels will configure additional labels to apply to the metrics.
func WithLabels(labels ...string) HandlerFactoryOption {
return func(config *handlerFactoryConfig) {
config.labels = append(config.labels, labels...)
}
}
// WithRequestDurationBuckets will configure the duration buckets used for
// incoming request histogram buckets.
func WithRequestDurationBuckets(buckets []float64) HandlerFactoryOption {
return func(config *handlerFactoryConfig) {
config.requestDurationBuckets = buckets
}
}
// WithTimeToWriteHeaderDurationBuckets will configure the time to write header
// duration histogram buckets.
func WithTimeToWriteHeaderDurationBuckets(buckets []float64) HandlerFactoryOption {
return func(config *handlerFactoryConfig) {
config.timeToWriteHeaderDurationBuckets = buckets
}
}
// WithByteSizeBuckets will configure the byte size histogram buckets for request
// and response payloads.
func WithByteSizeBuckets(buckets []float64) HandlerFactoryOption {
return func(config *handlerFactoryConfig) {
config.byteSizeBuckets = buckets
}
}
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