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110 lines
4.3 KiB
Markdown
110 lines
4.3 KiB
Markdown
[](https://travis-ci.org/googleapis/gnostic)
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# ⨁ gnostic
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This repository contains a Go command line tool which converts
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JSON and YAML [OpenAPI](https://github.com/OAI/OpenAPI-Specification)
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descriptions to and from equivalent Protocol Buffer representations.
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[Protocol Buffers](https://developers.google.com/protocol-buffers/)
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provide a language-neutral, platform-neutral, extensible mechanism
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for serializing structured data.
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**gnostic**'s Protocol Buffer models for the OpenAPI Specification
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can be used to generate code that includes data structures with
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explicit fields for the elements of an OpenAPI description.
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This makes it possible for developers to work with OpenAPI
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descriptions in type-safe ways, which is particularly useful
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in strongly-typed languages like Go and Swift.
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**gnostic** reads OpenAPI descriptions into
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these generated data structures, reports errors,
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resolves internal dependencies, and writes the results
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in a binary form that can be used in any language that is
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supported by the Protocol Buffer tools.
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A plugin interface simplifies integration with API
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tools written in a variety of different languages,
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and when necessary, Protocol Buffer OpenAPI descriptions
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can be reexported as JSON or YAML.
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**gnostic** compilation code and OpenAPI Protocol Buffer
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models are automatically generated from an
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[OpenAPI JSON Schema](https://github.com/OAI/OpenAPI-Specification/blob/master/schemas/v2.0/schema.json).
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Source code for the generator is in the [generate-gnostic](generate-gnostic) directory.
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## Disclaimer
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This is prerelease software and work in progress. Feedback and
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contributions are welcome, but we currently make no guarantees of
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function or stability.
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## Requirements
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**gnostic** can be run in any environment that supports [Go](http://golang.org)
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and the [Google Protocol Buffer Compiler](https://github.com/google/protobuf).
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## Installation
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1. Get this package by downloading it with `go get`.
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go get github.com/googleapis/gnostic
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2. [Optional] Build and run the compiler generator.
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This uses the OpenAPI JSON schema to generate a Protocol Buffer language file
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that describes the OpenAPI specification and a Go-language file of code that
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will read a JSON or YAML OpenAPI representation into the generated protocol
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buffers. Pre-generated versions of these files are in the OpenAPIv2 directory.
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cd $GOPATH/src/github.com/googleapis/gnostic/generate-gnostic
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go install
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cd ..
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generate-gnostic --v2
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3. [Optional] Generate Protocol Buffer support code.
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A pre-generated version of this file is checked into the OpenAPIv2 directory.
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This step requires a local installation of protoc, the Protocol Buffer Compiler,
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and the Go protoc plugin.
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You can get protoc [here](https://github.com/google/protobuf).
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You can install the plugin with this command:
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go get -u github.com/golang/protobuf/protoc-gen-go
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Then use the following to recompile the Gnostic Protocol Buffer models:
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./COMPILE-PROTOS.sh
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4. [Optional] Rebuild **gnostic**. This is only necessary if you've performed steps
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2 or 3 above.
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go install github.com/googleapis/gnostic
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5. Run **gnostic**. This will create a file in the current directory named "petstore.pb" that contains a binary
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Protocol Buffer description of a sample API.
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gnostic --pb-out=. examples/v2.0/json/petstore.json
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6. You can also compile files that you specify with a URL. Here's another way to compile the previous
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example. This time we're creating "petstore.text", which contains a textual representation of the
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Protocol Buffer description. This is mainly for use in testing and debugging.
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gnostic --text-out=petstore.text https://raw.githubusercontent.com/googleapis/gnostic/master/examples/petstore.json
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7. For a sample application, see apps/report.
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go install github.com/googleapis/gnostic/apps/report
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report petstore.pb
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8. **gnostic** supports plugins. This builds and runs a sample plugin
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that reports some basic information about an API. The "-" causes the plugin to
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write its output to stdout.
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go install github.com/googleapis/gnostic/plugins/gnostic-go-sample
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gnostic examples/v2.0/json/petstore.json --go-sample-out=-
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## Copyright
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Copyright 2017, Google Inc.
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## License
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Released under the Apache 2.0 license.
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