Python client for jsii runtime
Project description
Overview
jsii allows code in any language to naturally interact with JavaScript classes. It is the technology that enables the
AWS Cloud Development Kit to deliver polyglot libraries from a single codebase!
A class library written in TypeScript can be used in projects authored in TypeScript or Javascript (as usual), but also in Python, Java, C# (and other languages from the .NET family), ...
NOTE: Due to performance of the hosted Javascript engine and marshaling costs,
jsiimodules are best suited for development and build tools, as opposed to performance-sensitive or resource-constrained applications.See Runtime Architecture for more information.
An example is worth a thousand words
Consider the following TypeScript class:
export class HelloJsii {
public sayHello(name: string) {
return `Hello, ${name}!`;
}
}
By compiling our source module using jsii, we can now package it as modules in one of the supported target languages.
Each target module has the exact same API as the source. This allows users of that target language to use HelloJsii
like any other class:
- In Python:
hello = HelloJsii() hello.say_hello("World"); # => Hello, World!
- In Java
final HelloJsii hello = new HelloJsii(); hello.sayHello("World"); // => Hello, World!
- In C#
var hello = new HelloJsii(); hello.SayHello("World"); // => Hello, World!
- ... and more to come!
Toolchain
jsii consists of multiple single-purposed programs which can be used to compose various workflows.
We are considering creating an "umbrella entrypoint" to make it easier to consume.
| Name | Stability | Description |
|---|---|---|
jsii |
Stable | Compiles TypeScript to jsii module |
jsii-pacmak |
Stable | Creates ready-to-publish language-specific packages from jsii modules |
jsii-reflect |
Stable | Strong-typed reflection library for jsii type systems |
jsii-diff |
Stable | API backwards compatibility checker |
jsii-rosetta |
Experimental | Transpile code snippets (in docs) from TypeScript to jsii languages |
jsii-config |
Experimental | Interactive tool for generating jsii configuration |
jsii-release |
Community | Publishes jsii modules to all supported package managers |
jsii-srcmak |
Community | Generates relocatable source code in jsii languages from typescript |
jsii-docgen |
Community | Generates markdown API documentation for jsii modules |
"Community": a community-maintained project, not officially supported by the jsii team.
Getting Started
Let's create our first jsii TypeScript module (actual outputs may slightly differ):
$ mkdir hello-jsii
$ cd hello-jsii
$ npm init -y
Wrote to /tmp/hello-jsii/package.json:
{
"name": "hello-jsii",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC"
}
$ npm i --save-dev jsii jsii-pacmak
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN hello-jsii@1.0.0 No description
npm WARN hello-jsii@1.0.0 No repository field.
+ jsii-pacmak@0.14.3
+ jsii@0.14.3
added 65 packages from 54 contributors and audited 191 packages in 7.922s
found 0 vulnerabilities
Edit the package.json file:
/// package.json
{
// ...
"main": "lib/index.js",
"types": "lib/index.d.ts",
"scripts": {
"build": "jsii",
"build:watch": "jsii -w",
"package": "jsii-pacmak"
},
"jsii": {
"outdir": "dist",
"targets": {
"python": {
"distName": "acme.hello-jsii",
"module": "acme.hello_jsii"
},
"java": {
"package": "com.acme.hello",
"maven": {
"groupId": "com.acme.hello",
"artifactId": "hello-jsii"
}
},
"dotnet": {
"namespace": "Acme.HelloNamespace",
"packageId": "Acme.HelloPackage"
}
}
},
"author": {
"name": "John Doe"
},
"repository": {
"url": "https://github.com/acme/hello-jsii.git"
}
// ...
}
Read more about what those configuration entries do in the configuration documentation.
Okay, we are ready to write some code. Create a lib/index.ts file:
/// lib/index.ts
export class HelloJsii {
public sayHello(name: string) {
return `Hello, ${name}!`;
}
}
Build your module:
$ npm run build
If build succeeds, you will see the resulting lib/index.js and lib/index.d.ts files were produced, as well as the
.jsii file (contents may vary):
/// .jsii
{
"author": {
"name": "John Doe",
"roles": [
"author"
]
},
"description": "hello-jsii",
"homepage": "https://github.com/acme/hello-jsii.git",
"jsiiVersion": "0.14.3 (build 1b1062d)",
"license": "ISC",
"name": "hello-jsii",
"repository": {
"type": "git",
"url": "https://github.com/acme/hello-jsii.git"
},
"schema": "jsii/0.10.0",
"targets": {
"dotnet": {
"namespace": "Acme.HelloNamespace",
"packageId": "Acme.HelloPackage"
},
"java": {
"maven": {
"artifactId": "hello-jsii",
"groupId": "com.acme.hello"
},
"package": "com.acme.hello"
},
"js": {
"npm": "hello-jsii"
},
"python": {
"distName": "acme.hello-jsii",
"module": "acme.hello_jsii"
}
},
"types": {
"hello-jsii.HelloJsii": {
"assembly": "hello-jsii",
"fqn": "hello-jsii.HelloJsii",
"initializer": {},
"kind": "class",
"locationInModule": {
"filename": "lib/index.ts",
"line": 1
},
"methods": [
{
"locationInModule": {
"filename": "lib/index.ts",
"line": 2
},
"name": "sayHello",
"parameters": [
{
"name": "name",
"type": {
"primitive": "string"
}
}
],
"returns": {
"type": {
"primitive": "string"
}
}
}
],
"name": "HelloJsii"
}
},
"version": "1.0.0",
"fingerprint": "XYWYOiOupH4MmIjFj84wTSRfWqSw8hW37vHkVMO7iuY="
}
This file includes all the information needed in order to package your module into every jsii-supported language. It
contains the module metadata from package.json and a full declaration of your module's public API.
Okay, now the magic happens:
$ npm run package
> hello-jsii@1.0.0 package /Users/rmuller/Development/Demos/hello-jsii
> jsii-pacmak -v
[jsii-pacmak] [INFO] Building hello-jsii (python,java,dotnet,js) into dist
[jsii-pacmak] [INFO] Packaged. java (4.3s) | dotnet (2.0s) | python (0.9s) | npm pack (0.5s) | js (0.0s)
Now, if you check out the contents of dist, you'll find:
dist
├── dotnet
│ ├── Acme.HelloPackage.1.0.0.nupkg
│ └── Acme.HelloPackage.1.0.0.symbols.nupkg
├── java
│ └── com
│ └── acme
│ └── hello
│ └── hello-jsii
│ ├── 1.0.0
│ │ ├── hello-jsii-1.0.0-javadoc.jar
│ │ ├── hello-jsii-1.0.0-javadoc.jar.md5
│ │ ├── hello-jsii-1.0.0-javadoc.jar.sha1
│ │ ├── hello-jsii-1.0.0-sources.jar
│ │ ├── hello-jsii-1.0.0-sources.jar.md5
│ │ ├── hello-jsii-1.0.0-sources.jar.sha1
│ │ ├── hello-jsii-1.0.0.jar
│ │ ├── hello-jsii-1.0.0.jar.md5
│ │ ├── hello-jsii-1.0.0.jar.sha1
│ │ ├── hello-jsii-1.0.0.pom
│ │ ├── hello-jsii-1.0.0.pom.md5
│ │ └── hello-jsii-1.0.0.pom.sha1
│ ├── maven-metadata.xml
│ ├── maven-metadata.xml.md5
│ └── maven-metadata.xml.sha1
├── js
│ └── hello-jsii@1.0.0.jsii.tgz
└── python
├── acme.hello-jsii-1.0.0.tar.gz
└── acme.hello_jsii-1.0.0-py3-none-any.whl
These files are ready-to-publish artifacts for each target language. You can see the npm tarball under js, the
python package under python, the Maven repo under java, etc...
That's it. You are ready to rock!
Features
Source Languages
- TypeScript with some restrictions
Target Languages
- Javascript - generates an NPM package implicitly (no configuration required).
- Python - generates a ready-to-publish PyPI package.
- Java - generates a ready-to-publish Maven package.
- .NET - generates a ready-to-publish NuGet package.
See the configuration documentation for more information on configuring the various targets.
:book: Blog Posts
Here's a collection of blog posts (in chronological order) related to jsii:
- 2020-01-11: How to Create CDK Constructs, by Matthew Bonig
- 2020-05-27: Generate Python, Java, and .NET software libraries from a TypeScript source, by Hari Pachuveetil
:information_source: If you wrote blog posts about
jsiiand would like to have them referenced here, do not hesitate to file a pull request to add the links here!
:gear: Contributing
See CONTRIBUTING.
Contributors ✨
Thanks goes to these wonderful people (emoji key):
This project follows the all-contributors specification. Contributions of any kind welcome!
:balance_scale: License
jsii is distributed under the Apache License, Version 2.0.
Release history Release notifications | RSS feed
Download files
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
