255 lines
5.6 KiB
Markdown
255 lines
5.6 KiB
Markdown
[](https://www.codacy.com/app/fabiojose/sdk-javascript?utm_source=github.com&utm_medium=referral&utm_content=cloudevents/sdk-javascript&utm_campaign=Badge_Grade)
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[](https://travis-ci.org/cloudevents/sdk-javascript)
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# sdk-javascript
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Javascript SDK for CloudEvents
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> This is a WIP
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## Installation
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This CloudEvents SDK requires nodejs 6.11+
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### Nodejs
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```sh
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npm install cloudevents-sdk
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```
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## Specification Support
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These are the supported specifications by this version.
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| **Specifications** | **v0.1** | **v0.2** |
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|----------------------------|----------|----------|
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| CloudEvents | yes | yes |
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| HTTP Transport Binding | yes | yes |
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| JSON Event Format | yes | yes |
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## How to use
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The `Cloudevent` constructor arguments.
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```js
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/*
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* spec : if is null, set the spec 0.1 impl
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* format: if is null, set the JSON Format 0.1 impl
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*/
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Cloudevent(spec, format);
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```
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### Usage
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```js
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var Cloudevent = require("cloudevents-sdk");
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/*
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* Constructs a default instance with:
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* - Spec 0.1
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* - JSON Format 0.1
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*/
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var cloudevent01 = new Cloudevent();
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/*
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* Implemented using Builder Design Pattern
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*/
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cloudevent01
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.type("com.github.pull.create")
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.source("urn:event:from:myapi/resourse/123");
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/*
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* Backward compatibility by injecting methods from spec implementation to Cloudevent
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*/
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cloudevent01
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.eventTypeVersion("1.0");
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/*
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* Constructs an instance with:
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* - Spec 0.2
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* - JSON Format 0.1
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*/
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var cloudevent02 = new Cloudevent(Cloudevent.specs["0.2"]);
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/*
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* Different specs, but the same API.
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*/
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cloudevent02
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.type("com.github.pull.create")
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.source("urn:event:from:myapi/resourse/123");
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```
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#### Formatting
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```js
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var Cloudevent = require("cloudevents-sdk");
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var cloudevent = new Cloudevent()
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.type("com.github.pull.create")
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.source("urn:event:from:myapi/resourse/123");
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/*
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* Format the payload and return it.
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*/
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var formatted = cloudevent.format();
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```
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#### Emitting
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```js
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var Cloudevent = require("cloudevents-sdk");
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// The event
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var cloudevent = new Cloudevent()
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.type("com.github.pull.create")
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.source("urn:event:from:myapi/resourse/123");
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// The binding configuration using POST
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var config = {
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method: "POST",
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url : "https://myserver.com"
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};
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// The binding instance
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var binding = Cloudevent.bindings["http-structured0.1"](config);
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// Emit the event using Promise
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binding.emit(cloudevent)
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.then(response => {
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// Treat the response
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console.log(response.data);
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}).catch(err => {
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// Treat the error
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console.error(err);
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});
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```
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## Repository Structure
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```text
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├── index.js
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├── lib
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│ ├── bindings
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│ │ └── http
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│ │ └── structured_0_1.js
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│ ├── cloudevent.js
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│ ├── format
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│ │ └── json_0_1.js
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│ └── specs
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│ ├── spec_0_1.js
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│ └── spec_0_2.js
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├── LICENSE
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├── package.json
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├── README.md
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└── test
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├── cloudevent_spec_0_1.js
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├── cloudevent_spec_0_2.js
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└── http_binding_0_1.js
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```
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* `index.js`: library exports
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* `lib/bindings`: every binding implementation goes here
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* `lib/bindings/http`: every http binding implementation goes here
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* `lib/bindings/http/structured_0_1.js`: implementation of structured
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HTTP Binding
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* `lib/cloudevent.js`: implementation of Cloudevent, an interface
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* `lib/format/`: every format implementation goes here
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* `lib/format/json_0_1.js`: implementation for JSON formatting [version 0.1](https://github.com/cloudevents/spec/blob/v0.1/json-format.md)
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* `lib/specs/`: every spec implementation goes here
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* `lib/specs/spec_0_1.js`: implementation for spec
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[version 0.1](https://github.com/cloudevents/spec/blob/v0.1/spec.md)
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* `lib/specs/spec_0_2.js`: implementation for spec
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[version 0.2](https://github.com/cloudevents/spec/blob/v0.2/spec.md)
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* `test/cloudevent_spec_0_1.js`: unit testing for spec 0.1
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* `test/cloudevent_spec_0_2.js`: unit testing for spec 0.2
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## Unit Testing
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The unit test checks the result of formatted payload and the constraints.
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```bash
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npm test
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```
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## The API
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### `Cloudevent` class
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```js
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/*
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* Format the payload and return an Object.
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*/
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Object Cloudevent.format()
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/*
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* Format the payload as String.
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*/
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String Cloudevent.toString()
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```
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### `Formatter` classes
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Every formatter class must implement these methods to work properly.
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```js
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/*
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* Format the Cloudevent payload argument and return an Object.
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*/
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Object Formatter.format(payload)
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/*
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* Format the Cloudevent payload as String.
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*/
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String Formatter.toString(payload)
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```
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## `Spec` classes
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Every Spec class must implement these methods to work properly.
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```js
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/*
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* The constructor must receives the Cloudevent type.
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*/
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Spec(Cloudevent)
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/*
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* Checks the spec constraints, throwing an error if do not pass.
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*/
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Spec.check()
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```
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### `Binding` classes
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Every Binding class must implement these methods to work properly.
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```js
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/*
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* The constructor must receives the map of configurations.
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*/
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Binding(config)
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/*
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* Emits the event using an instance of Cloudevent.
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*/
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Binding.emit(cloudevent)
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```
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> See how to implement the method injection [here](lib/specs/spec_0_1.js#L17)
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>
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> Learn about [Builder Design Pattern](https://en.wikipedia.org/wiki/Builder_pattern)
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>
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> Check out the produced event payload using this [tool](https://webhook.site)
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