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start-devserver.js
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start-devserver.js
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const protractor = require('protractor');
const utils = require('@bazel/protractor/protractor-utils');
const spawn = require('child_process').spawn;
/**
* Runs the specified server binary from a given workspace and waits for the server
* being ready. The server binary will be resolved from the runfiles.
*/
async function runBazelServer(workspace, serverPath, timeout) {
const serverBinary = require.resolve(`${workspace}/${serverPath}`);
const port = await utils.findFreeTcpPort();
// Start the Bazel server binary with a random free TCP port.
const serverProcess = spawn(serverBinary, ['-port', port], {stdio: 'inherit'});
// In case the process exited with an error, we want to propagate the error.
serverProcess.on('exit', exitCode => {
if (exitCode !== 0) {
throw new Error(`Server exited with error code: ${exitCode}`);
}
});
// Wait for the server to be bound to the given port.
await utils.waitForServer(port, timeout);
return port;
}
/**
* Called by Protractor before starting any tests. This is script is responsible for
* starting up the devserver and updating the Protractor base URL to the proper port.
*/
module.exports = async function(config) {
const port = await runBazelServer(config.workspace, config.server);
const baseUrl = `http://localhost:${port}`;
const processedConfig = await protractor.browser.getProcessedConfig();
// Update the protractor "baseUrl" to match the new random TCP port. We need random TCP ports
// because otherwise Bazel could not execute protractor tests concurrently.
protractor.browser.baseUrl = baseUrl;
processedConfig.baseUrl = baseUrl;
};