43 lines
1.3 KiB
Go
43 lines
1.3 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package metrics contains expvar & Prometheus types and code used by
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// Tailscale for monitoring.
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package metrics
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import "expvar"
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// Set is a string-to-Var map variable that satisfies the expvar.Var
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// interface.
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//
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// Semantically, this is mapped by tsweb's Prometheus exporter as a
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// collection of unrelated variables exported with a common prefix.
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//
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// This lets us have tsweb recognize *expvar.Map for different
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// purposes in the future. (Or perhaps all uses of expvar.Map will
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// require explicit types like this one, declaring how we want tsweb
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// to export it to Prometheus.)
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type Set struct {
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expvar.Map
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}
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// LabelMap is a string-to-Var map variable that satisfies the
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// expvar.Var interface.
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//
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// Semantically, this is mapped by tsweb's Prometheus exporter as a
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// collection of variables with the same name, with a varying label
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// value. Use this to export things that are intuitively breakdowns
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// into different buckets.
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type LabelMap struct {
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Label string
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expvar.Map
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}
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// Get returns a direct pointer to the expvar.Int for key, creating it
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// if necessary.
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func (m *LabelMap) Get(key string) *expvar.Int {
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m.Add(key, 0)
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return m.Map.Get(key).(*expvar.Int)
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}
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