@rushstack/rush-http-build-cache-plugin

A Rush plugin that uses HTTP/HTTPS to manage cache objects.

Authentication is provided via standard Authorization HTTP headers, with the value (a Bearer or Basic token) configured using a custom node script. Your "tokenHandler" node script is automatically called when the user updates their cloud credentials.

Configuration

To use the HTTP build cache plugin, enable it in common/config/rush/build-cache.json:

{
    "buildCacheEnabled": true,

    "cacheProvider": "http"
}

Then customize the httpConfiguration block. For typical use cases, where you'll use a remote HTTP URL with authentication, you'll need to provide at least the url and tokenHandler options:

{
    "httpConfiguration": {
        "url": "https://build-cache.example.com",
        "tokenHandler": {
            "exec": "node",
            "args": ["common/scripts/custom-script-that-returns-an-authentication-header.js"]
        },
        "isCacheWriteAllowed": false
    }
}

(For more detail on the above properties and additional optional properties, consult the default build-cache.json file.)

Authorization Details

The HTTP build cache plugin offloads authorization to an external executable script that you define. A typical use case would be to create a simple script, for example common/scripts/cache-auth.js, that prints an Authorization header value when executed.

For example:

node common/scripts/cache-auth.js
# => Bearer 0284357923592790DDb979dBcd2zz

How the script generates authorization values is up to you, and depends on the configuration of your remote cache server.

Possible implementations:

The script could read simple environment variables (CACHE_USER and CACHE_TOKEN) defined by the developer
It could reuse existing credentials your developers have, like NPM tokens, GitHub credentials, or jFrog API tokens
It could make an HTTP call to another server accessible by your developers that returns temporary credentials

HTTP Cache Server Requirements

The HTTP build cache plugin can use almost any HTTP/HTTPS backend for remote caching, as long as it honors the following rules:

Uses Authorization: Bearer xxx or Authorization: Basic xxx headers for authentication.
Accepts GET requests for cache reads.
Accepts PUT requests for cache writes (with a raw request body -- no form/multipart MIME types).
Cache hits return HTTP 200 with the file in the response body.
Successful cache writes return HTTP 2xx (200-299).
Cache misses return HTTP 404 or HTTP 403.
Invalid or missing authentication returns HTTP 401.

Examples

Gradle Build Cache Server

The Gradle Build Cache Server (typically used to support Gradle Remote Build Cache) meets all of the requirements above, so if you don't have another server in mind, you can use it as your remote backend.

First, start up and configure your build cache node locally:

Download latest JAR file from https://docs.gradle.com/build-cache-node/
Start the service: java -jar build-cache-node-14.0.jar start
Copy the startup banner information, and navigate to the specified localhost port
Enter the temporary username/password credentials printed in the startup banner
Click Build Cache > Settings > Cache Access Control and grant "Read & write" access to Anonymous

Second, configure your build-cache.json file as described in the Configuration section:

Note that your url must end with /cache/, for example, http://localhost:5071/cache/.
To test reading and writing, set isCacheWriteAllowed: true.
Configure tokenHandler to point to a script that prints a Basic or Bearer Authorization value (this can be a dummy string if you granted Read and Write to Anonymous in your build cache node configuration).

Note that the Gradle Build Cache Server has a stricter format for its cache keys (they should be a simple hexadecimal hash with no non-alphanumeric characters). Configure this setting in your build-cache.json file:

{
    "cacheEntryNamePattern": "[hash]"
}

Last, initialize your cache credentials using Rush:

rush update-cloud-credentials --interactive

To test out your remote build cache with full debugging output (for spotting any errors reading or writing the cache), run with the --debug flag:

rush --debug build --verbose

If you go on to deploy Rush remote build caching to your developers using the Gradle Build Cache, update your tokenHandler script to reflect your use case -- for example, you could require each developer to have a designated username/token configured via environment variables, and configure Cache Access Control with the corresponding entries. In this case the tokenHandler script should read the environment variables and print out an Authorization header, for example:
// common/scripts/build-cache-auth.js
const credentials = `${process.env.CACHE_USER}:${process.env.CACHE_TOKEN}`;
console.log('Basic ' + Buffer.from(credentials).toString('base64'));

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