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63 lines
1.8 KiB
Go
63 lines
1.8 KiB
Go
// Go port of Coda Hale's Metrics library
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//
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// <https://github.com/rcrowley/go-metrics>
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//
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// Coda Hale's original work: <https://github.com/codahale/metrics>
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package metrics
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import (
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"os"
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"runtime/metrics"
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"strings"
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"sync/atomic"
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)
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// Enabled is checked by the constructor functions for all of the
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// standard metrics. If it is true, the metric returned is a stub.
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//
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// This global kill-switch helps quantify the observer effect and makes
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// for less cluttered pprof profiles.
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var Enabled = false
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// callbacks - storing list of callbacks as type []func()
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// use metrics.AddCallback to add your function to metrics collection loop (to avoid multiple goroutines collecting metrics)
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var callbacks atomic.Value
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func init() {
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metrics.All()
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callbacks.Store([]func(){})
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}
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// Calling Load method
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// EnabledExpensive is a soft-flag meant for external packages to check if costly
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// metrics gathering is allowed or not. The goal is to separate standard metrics
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// for health monitoring and debug metrics that might impact runtime performance.
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var EnabledExpensive = false
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// enablerFlags is the CLI flag names to use to enable metrics collections.
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var enablerFlags = []string{"metrics"}
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// expensiveEnablerFlags is the CLI flag names to use to enable metrics collections.
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var expensiveEnablerFlags = []string{"metrics.expensive"}
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// Init enables or disables the metrics system. Since we need this to run before
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// any other code gets to create meters and timers, we'll actually do an ugly hack
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// and peek into the command line args for the metrics flag.
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func init() {
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for _, arg := range os.Args {
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flag := strings.TrimLeft(arg, "-")
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for _, enabler := range enablerFlags {
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if !Enabled && flag == enabler {
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Enabled = true
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}
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}
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for _, enabler := range expensiveEnablerFlags {
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if !EnabledExpensive && flag == enabler {
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EnabledExpensive = true
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}
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}
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}
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}
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