57 lines
1.9 KiB
Go
57 lines
1.9 KiB
Go
package metrics
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import (
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"net/http"
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"github.com/go-kit/kit/metrics"
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)
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// CounterWithHeaders represents a counter that can use http.Header values as label values.
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type CounterWithHeaders interface {
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Add(delta float64)
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With(headers http.Header, labelValues ...string) CounterWithHeaders
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}
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// MultiCounterWithHeaders collects multiple individual CounterWithHeaders and treats them as a unit.
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type MultiCounterWithHeaders []CounterWithHeaders
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// NewMultiCounterWithHeaders returns a multi-counter, wrapping the passed CounterWithHeaders.
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func NewMultiCounterWithHeaders(c ...CounterWithHeaders) MultiCounterWithHeaders {
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return c
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}
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// Add adds the given delta value to the counter value.
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func (c MultiCounterWithHeaders) Add(delta float64) {
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for _, counter := range c {
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counter.Add(delta)
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}
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}
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// With creates a new counter by appending the given label values and http.Header as labels and returns it.
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func (c MultiCounterWithHeaders) With(headers http.Header, labelValues ...string) CounterWithHeaders {
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next := make(MultiCounterWithHeaders, len(c))
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for i := range c {
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next[i] = c[i].With(headers, labelValues...)
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}
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return next
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}
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// NewCounterWithNoopHeaders returns a CounterWithNoopHeaders.
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func NewCounterWithNoopHeaders(counter metrics.Counter) CounterWithNoopHeaders {
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return CounterWithNoopHeaders{counter: counter}
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}
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// CounterWithNoopHeaders is a counter that satisfies CounterWithHeaders but ignores the given http.Header.
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type CounterWithNoopHeaders struct {
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counter metrics.Counter
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}
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// Add adds the given delta value to the counter value.
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func (c CounterWithNoopHeaders) Add(delta float64) {
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c.counter.Add(delta)
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}
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// With creates a new counter by appending the given label values and returns it.
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func (c CounterWithNoopHeaders) With(_ http.Header, labelValues ...string) CounterWithHeaders {
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return NewCounterWithNoopHeaders(c.counter.With(labelValues...))
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}
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