Golang zap

In contexts where performance golang zap nice, but not critical, use the SugaredLogger. It's x faster than other structured logging packages and includes both structured and printf -style APIs. When performance and type safety are critical, use the Logger.

Package zapcore defines and implements the low-level interfaces upon which zap is built. By providing alternate implementations of these interfaces, external packages can extend zap's capabilities. DefaultLineEnding defines the default line ending when writing logs. Alternate line endings specified in EncoderConfig can override this behavior. DefaultClock is the default clock used by Zap in operations that require time.

Golang zap

In contexts where performance is nice, but not critical, use the SugaredLogger. It's x faster than other structured logging packages and includes both structured and printf -style APIs. When performance and type safety are critical, use the Logger. It's even faster than the SugaredLogger and allocates far less, but it only supports structured logging. See the documentation and FAQ for more details. For applications that log in the hot path, reflection-based serialization and string formatting are prohibitively expensive — they're CPU-intensive and make many small allocations. Zap takes a different approach. It includes a reflection-free, zero-allocation JSON encoder, and the base Logger strives to avoid serialization overhead and allocations wherever possible. By building the high-level SugaredLogger on that foundation, zap lets users choose when they need to count every allocation and when they'd prefer a more familiar, loosely typed API. As measured by its own benchmarking suite , not only is zap more performant than comparable structured logging packages — it's also faster than the standard library. Like all benchmarks, take these with a grain of salt. All APIs are finalized, and no breaking changes will be made in the 1. We encourage and support an active, healthy community of contributors — including you! Details are in the contribution guide and the code of conduct. The zap maintainers keep an eye on issues and pull requests, but you can also report any negative conduct to oss-conduct uber.

ISOTimeEncoder serializes a time.

Zap is a structured logging package developed by Uber and designed for Go applications. This claim is supported by their benchmarking results , which demonstrate that Zap outperforms almost all other comparable structured logging libraries for Go, except Zerolog. In this comprehensive guide, we'll delve into the Zap package and discuss many of its most useful features. We'll start with the basic setup of Zap in a Go program, then move on to detailed examples illustrating how to write and manage logs of various levels and formats. Finally, we'll wrap up the article by touching base on more advanced topics such as custom encoders, multi-output logging, and using Zap as an Slog backend. Before following through with this tutorial, we recommend having the latest version of Go installed on your computer v1.

A logr implementation using Zap. Can also be used as slog handler. Logr uses arbitrary numeric levels. Zap does not have named levels that are more verbose than DebugLevel , but it's possible to fake it. Zap's levels get more verbose as the number gets smaller and more important and the number gets larger DebugLevel is -1, InfoLevel is 0, WarnLevel is 1, and so on.

Golang zap

Of course, besides that, I wanted to get more familiar with it so that I could use the library more efficiently and avoid being unable to locate it when problems arise. The NewExample function shows a Core structure to be created by NewCore, which we should be able to guess is the core of zap based on its name. Similarly with zap, the three parameters that need to be passed when creating a Core structure with NewCore are: Encoder for the input data, WriteSyncer for the log data, and LevelEnabler for the log level.

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ArrayMarshaler Field. URL zap. WithOptions doubled. Similarly, package authors can use the high-performance Encoder and Core implementations in the zapcore package to build their own loggers. Goexit inside custom hooks at minimum. This will log the first 10 log entries with the same level and message in a one second interval as-is. NewRaw returns a new zap. NewProductionEncoderConfig productionCfg. Stdout, nil. Encoder is a format-agnostic interface for all log entry marshalers. After the introduction of the new structured logging package for Go , known as Slog , there has been work on implementing the slog.

Zap is a structured logging package developed by Uber and designed for Go applications.

Reducing Logging Costs. WithValue r. Sync logger. Note that pointers to these objects must implement zapcore. Blazing fast, structured, leveled logging in Go. Package stacktrace provides support for gathering stack traces efficiently. It's safe to call this on nil CheckedEntry references. Package zapcore defines and implements the low-level interfaces upon which zap is built. You signed out in another tab or window. His work was featured on several esteemed publications including LWN. More decisions may be added in the future. Keyboard shortcuts. NewCore consoleEncoder, consoleErrors, highPriority , zapcore.