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Merge pull request #110 from ava-labs/metrics-pkg
add metrics pkg
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| This repo has been forked from https://github.com/rcrowley/go-metrics at commit e181e09 |
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| Copyright 2012 Richard Crowley. All rights reserved. | ||
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| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions are | ||
| met: | ||
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| 1. Redistributions of source code must retain the above copyright | ||
| notice, this list of conditions and the following disclaimer. | ||
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| 2. Redistributions in binary form must reproduce the above | ||
| copyright notice, this list of conditions and the following | ||
| disclaimer in the documentation and/or other materials provided | ||
| with the distribution. | ||
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| THIS SOFTWARE IS PROVIDED BY RICHARD CROWLEY ``AS IS'' AND ANY EXPRESS | ||
| OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | ||
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
| DISCLAIMED. IN NO EVENT SHALL RICHARD CROWLEY OR CONTRIBUTORS BE LIABLE | ||
| FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
| CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
| SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
| INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | ||
| CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
| ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | ||
| THE POSSIBILITY OF SUCH DAMAGE. | ||
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| The views and conclusions contained in the software and documentation | ||
| are those of the authors and should not be interpreted as representing | ||
| official policies, either expressed or implied, of Richard Crowley. |
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| go-metrics | ||
| ========== | ||
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|  | ||
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| Go port of Coda Hale's Metrics library: <https://github.com/dropwizard/metrics>. | ||
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| Documentation: <https://godoc.org/github.com/rcrowley/go-metrics>. | ||
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| Usage | ||
| ----- | ||
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| Create and update metrics: | ||
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| ```go | ||
| c := metrics.NewCounter() | ||
| metrics.Register("foo", c) | ||
| c.Inc(47) | ||
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| g := metrics.NewGauge() | ||
| metrics.Register("bar", g) | ||
| g.Update(47) | ||
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| r := NewRegistry() | ||
| g := metrics.NewRegisteredFunctionalGauge("cache-evictions", r, func() int64 { return cache.getEvictionsCount() }) | ||
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| s := metrics.NewExpDecaySample(1028, 0.015) // or metrics.NewUniformSample(1028) | ||
| h := metrics.NewHistogram(s) | ||
| metrics.Register("baz", h) | ||
| h.Update(47) | ||
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| m := metrics.NewMeter() | ||
| metrics.Register("quux", m) | ||
| m.Mark(47) | ||
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| t := metrics.NewTimer() | ||
| metrics.Register("bang", t) | ||
| t.Time(func() {}) | ||
| t.Update(47) | ||
| ``` | ||
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| Register() is not threadsafe. For threadsafe metric registration use | ||
| GetOrRegister: | ||
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| ```go | ||
| t := metrics.GetOrRegisterTimer("account.create.latency", nil) | ||
| t.Time(func() {}) | ||
| t.Update(47) | ||
| ``` | ||
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| **NOTE:** Be sure to unregister short-lived meters and timers otherwise they will | ||
| leak memory: | ||
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| ```go | ||
| // Will call Stop() on the Meter to allow for garbage collection | ||
| metrics.Unregister("quux") | ||
| // Or similarly for a Timer that embeds a Meter | ||
| metrics.Unregister("bang") | ||
| ``` | ||
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| Periodically log every metric in human-readable form to standard error: | ||
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| ```go | ||
| go metrics.Log(metrics.DefaultRegistry, 5 * time.Second, log.New(os.Stderr, "metrics: ", log.Lmicroseconds)) | ||
| ``` | ||
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| Periodically log every metric in slightly-more-parseable form to syslog: | ||
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| ```go | ||
| w, _ := syslog.Dial("unixgram", "/dev/log", syslog.LOG_INFO, "metrics") | ||
| go metrics.Syslog(metrics.DefaultRegistry, 60e9, w) | ||
| ``` | ||
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| Periodically emit every metric to Graphite using the [Graphite client](https://github.com/cyberdelia/go-metrics-graphite): | ||
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| ```go | ||
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| import "github.com/cyberdelia/go-metrics-graphite" | ||
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| addr, _ := net.ResolveTCPAddr("tcp", "127.0.0.1:2003") | ||
| go graphite.Graphite(metrics.DefaultRegistry, 10e9, "metrics", addr) | ||
| ``` | ||
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| Installation | ||
| ------------ | ||
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| ```sh | ||
| go get github.com/rcrowley/go-metrics | ||
| ``` | ||
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| StatHat support additionally requires their Go client: | ||
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| ```sh | ||
| go get github.com/stathat/go | ||
| ``` | ||
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| Publishing Metrics | ||
| ------------------ | ||
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| Clients are available for the following destinations: | ||
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| * Prometheus - https://github.com/deathowl/go-metrics-prometheus |
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| // (c) 2022, Ava Labs, Inc. | ||
| // | ||
| // This file is a derived work, based on the go-ethereum library whose original | ||
| // notices appear below. | ||
| // | ||
| // It is distributed under a license compatible with the licensing terms of the | ||
| // original code from which it is derived. | ||
| // | ||
| // Much love to the original authors for their work. | ||
| // ********** | ||
| // Copyright 2021 The go-ethereum Authors | ||
| // This file is part of go-ethereum. | ||
| // | ||
| // The go-ethereum library is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // The go-ethereum library is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. | ||
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| package metrics | ||
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| // Config contains the configuration for the metric collection. | ||
| type Config struct { | ||
| Enabled bool `toml:",omitempty"` | ||
| EnabledExpensive bool `toml:",omitempty"` | ||
| HTTP string `toml:",omitempty"` | ||
| Port int `toml:",omitempty"` | ||
| } | ||
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| // DefaultConfig is the default config for metrics used in go-ethereum. | ||
| var DefaultConfig = Config{ | ||
| Enabled: false, | ||
| EnabledExpensive: false, | ||
| HTTP: "127.0.0.1", | ||
| Port: 6060, | ||
| } |
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