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83 lines
3 KiB
Markdown
83 lines
3 KiB
Markdown
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Measurable: The useless Go metric registration package that doesn't do anything
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===============================================================================
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[](https://godoc.org/gopkg.in/hlandau/measurable.v1)
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Measurable is a Go library for managing the registration of metrics such as
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counters and gauges, no matter how that metric data is eventually consumed.
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The most noteworthy feature of measurable is that it doesn't do anything. It
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contains no functionality for providing metric data to any external service,
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and it contains no actual metric implementations.
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The purpose of measurable is to act as an [integration
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nexus](https://www.devever.net/~hl/nexuses), essentially a matchmaker between
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metric sources and metric consumers. This creates the important feature that
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your application's metrics can be expressed completely independently of *how*
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those metrics are exported.
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Measurable doesn't implement any metric or metric export logic because it
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strives to be a neutral intermediary, which abstracts the interface between
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metrics and metric exporters.
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**Import as:** `gopkg.in/hlandau/measurable.v1`
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Measurable
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----------
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A Measurable is an object that represents some metric. It is obliged only to
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implement the following interface:
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```go
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type Measurable interface {
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MsName() string
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MsType() Type
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}
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```
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Measurable is designed around interface upgrades. If you want to actually
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do anything with a Measurable, you must attempt to cast it to an interface
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with the methods you need. A Measurable is not obliged to implement any
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interface besides Measurable, but almost always will.
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Here are some common interfaces implemented by Measurables, in descending order
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of importance:
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- `MsName() string` — get the Measurable name.
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- `MsType() Type` — get the Measurable type.
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- `MsInt64() int64` — get the Measurable as an int64.
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- `String() string` — the standard Go `String()` interface.
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All Measurables should implement `MsName() string` and `MsType() Type`.
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Measurable-specific methods should always be prefixed by `Ms` so it is clear
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they are intended for consumption by Measurable consumers.
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`MsName`, `MsType` and `MsInt64` should suffice for most consumers of Counter
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and Gauge metric types.
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Metrics should be named in lowercase using dots to create a hierarchy and
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dashes to separate words, e.g. `someserver.http.request-count`. These metric
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names may be transmuted by consumers as necessary for some graphing systems,
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such as Prometheus (which allows only underscores).
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Standard Bindings
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-----------------
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For a package which makes it easy to register and consume measurables, see the
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[easymetric](https://github.com/hlandau/easymetric) package.
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Of course, nothing requires you to use the easymetric package. You are free to escew it and make your own.
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Background Reading
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------------------
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- [On Nexuses](https://www.devever.net/~hl/nexuses)
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- See also: [Configurable](https://github.com/hlandau/configurable)
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Licence
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-------
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© 2015 Hugo Landau <hlandau@devever.net> MIT License
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