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With CoreDNS now supporting etcdv3 as the DNS backend, we can update our federation target to etcdv3. Users will now be able to use etcdv3 server as the federation backbone. Minio will update bucket data to etcdv3 and CoreDNS can pick that data up and serve it as bucket style DNS path.
137 lines
5.0 KiB
Markdown
137 lines
5.0 KiB
Markdown
# :zap: zap [![GoDoc][doc-img]][doc] [![Build Status][ci-img]][ci] [![Coverage Status][cov-img]][cov]
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Blazing fast, structured, leveled logging in Go.
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## Installation
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`go get -u go.uber.org/zap`
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Note that zap only supports the two most recent minor versions of Go.
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## Quick Start
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In contexts where performance is nice, but not critical, use the
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`SugaredLogger`. It's 4-10x faster than other structured logging
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packages and includes both structured and `printf`-style APIs.
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```go
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logger, _ := zap.NewProduction()
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defer logger.Sync() // flushes buffer, if any
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sugar := logger.Sugar()
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sugar.Infow("failed to fetch URL",
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// Structured context as loosely typed key-value pairs.
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"url", url,
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"attempt", 3,
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"backoff", time.Second,
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)
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sugar.Infof("Failed to fetch URL: %s", url)
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```
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When performance and type safety are critical, use the `Logger`. It's even
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faster than the `SugaredLogger` and allocates far less, but it only supports
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structured logging.
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```go
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logger, _ := zap.NewProduction()
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defer logger.Sync()
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logger.Info("failed to fetch URL",
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// Structured context as strongly typed Field values.
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zap.String("url", url),
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zap.Int("attempt", 3),
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zap.Duration("backoff", time.Second),
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)
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```
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See the [documentation][doc] and [FAQ](FAQ.md) for more details.
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## Performance
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For applications that log in the hot path, reflection-based serialization and
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string formatting are prohibitively expensive — they're CPU-intensive
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and make many small allocations. Put differently, using `encoding/json` and
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`fmt.Fprintf` to log tons of `interface{}`s makes your application slow.
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Zap takes a different approach. It includes a reflection-free, zero-allocation
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JSON encoder, and the base `Logger` strives to avoid serialization overhead
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and allocations wherever possible. By building the high-level `SugaredLogger`
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on that foundation, zap lets users *choose* when they need to count every
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allocation and when they'd prefer a more familiar, loosely typed API.
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As measured by its own [benchmarking suite][], not only is zap more performant
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than comparable structured logging packages — it's also faster than the
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standard library. Like all benchmarks, take these with a grain of salt.<sup
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id="anchor-versions">[1](#footnote-versions)</sup>
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Log a message and 10 fields:
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| Package | Time | Objects Allocated |
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| :--- | :---: | :---: |
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| :zap: zap | 3131 ns/op | 5 allocs/op |
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| :zap: zap (sugared) | 4173 ns/op | 21 allocs/op |
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| zerolog | 16154 ns/op | 90 allocs/op |
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| lion | 16341 ns/op | 111 allocs/op |
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| go-kit | 17049 ns/op | 126 allocs/op |
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| logrus | 23662 ns/op | 142 allocs/op |
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| log15 | 36351 ns/op | 149 allocs/op |
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| apex/log | 42530 ns/op | 126 allocs/op |
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Log a message with a logger that already has 10 fields of context:
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| Package | Time | Objects Allocated |
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| :--- | :---: | :---: |
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| :zap: zap | 380 ns/op | 0 allocs/op |
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| :zap: zap (sugared) | 564 ns/op | 2 allocs/op |
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| zerolog | 321 ns/op | 0 allocs/op |
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| lion | 7092 ns/op | 39 allocs/op |
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| go-kit | 20226 ns/op | 115 allocs/op |
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| logrus | 22312 ns/op | 130 allocs/op |
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| log15 | 28788 ns/op | 79 allocs/op |
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| apex/log | 42063 ns/op | 115 allocs/op |
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Log a static string, without any context or `printf`-style templating:
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| Package | Time | Objects Allocated |
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| :--- | :---: | :---: |
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| :zap: zap | 361 ns/op | 0 allocs/op |
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| :zap: zap (sugared) | 534 ns/op | 2 allocs/op |
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| zerolog | 323 ns/op | 0 allocs/op |
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| standard library | 575 ns/op | 2 allocs/op |
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| go-kit | 922 ns/op | 13 allocs/op |
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| lion | 1413 ns/op | 10 allocs/op |
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| logrus | 2291 ns/op | 27 allocs/op |
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| apex/log | 3690 ns/op | 11 allocs/op |
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| log15 | 5954 ns/op | 26 allocs/op |
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## Development Status: Stable
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All APIs are finalized, and no breaking changes will be made in the 1.x series
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of releases. Users of semver-aware dependency management systems should pin
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zap to `^1`.
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## Contributing
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We encourage and support an active, healthy community of contributors —
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including you! Details are in the [contribution guide](CONTRIBUTING.md) and
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the [code of conduct](CODE_OF_CONDUCT.md). The zap maintainers keep an eye on
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issues and pull requests, but you can also report any negative conduct to
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oss-conduct@uber.com. That email list is a private, safe space; even the zap
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maintainers don't have access, so don't hesitate to hold us to a high
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standard.
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<hr>
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Released under the [MIT License](LICENSE.txt).
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<sup id="footnote-versions">1</sup> In particular, keep in mind that we may be
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benchmarking against slightly older versions of other packages. Versions are
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pinned in zap's [glide.lock][] file. [↩](#anchor-versions)
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[doc-img]: https://godoc.org/go.uber.org/zap?status.svg
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[doc]: https://godoc.org/go.uber.org/zap
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[ci-img]: https://travis-ci.org/uber-go/zap.svg?branch=master
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[ci]: https://travis-ci.org/uber-go/zap
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[cov-img]: https://codecov.io/gh/uber-go/zap/branch/master/graph/badge.svg
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[cov]: https://codecov.io/gh/uber-go/zap
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[benchmarking suite]: https://github.com/uber-go/zap/tree/master/benchmarks
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[glide.lock]: https://github.com/uber-go/zap/blob/master/glide.lock
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