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Temporal Web UI

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Temporal is a distributed, scalable, durable, and highly available orchestration engine we developed at Uber Engineering to execute asynchronous long-running business logic in a scalable and resilient way.

This web UI is used to view workflows from Temporalio, see what's running, and explore and debug workflow executions.

Getting Started

Configuration

Set these environment variables if you need to change their defaults

Variable Description Default
TEMPORAL_GRPC_ENDPOINT String representing server gRPC endpoint 127.0.0.1:7233
TEMPORAL_WEB_PORT HTTP port to serve on 8088
TEMPORAL_PERMIT_WRITE_API Boolean to permit write API methods such as Terminating Workflows true
TEMPORAL_HOT_RELOAD_PORT HTTP port used by hot reloading in development 8081
TEMPORAL_HOT_RELOAD_TEST_PORT HTTP port used by hot reloading in tests 8082
TEMPORAL_EXTERNAL_SCRIPTS Addtional JavaScript tags to serve in the UI

Running locally

temporal-web uses all the standard npm scripts to install dependencies, run the server, and run tests. Additionally to run locally with webpack hot reloading and other conveniences, use

make
npm run dev

For development and contributing to temporal-web, please see the contributing guide.

You may also use docker by pulling temporalio/web. It is also included in the Temporal server's local docker setup.

API

If you need to extend temporal-web to add middleware to the server, you can install temporal-web as a dependecy, and it will export the Koa web server that has not yet been started or configured. It includes an additional init function that will then compose the built-in middleware. This gives you an option to add middleware before or after you call init so it will add the middleware at the beginning or the end of the chain, respectively.

init(options)

All options are optional.

useWebpack: If true, starts webpack and adds the middleware, otherwise if false, it assumes the UI bundle was already built and serves it statically. Defaults to process.env.NODE_ENV === 'production'.

logErrors: If true, thrown errors are logged to console.error. Defaults to true.

For example, here is how you would add a request count metric using uber-statsd-client:

var app = require('temporal-web');
var createStatsd = require('uber-statsd-client');
var sdc = createStatsd({
  host: 'statsd.example.com',
});

app
  .use(async function(ctx, next) {
    sdc.increment('http.request');
    await next();
  })
  .init()
  .listen(7000);

The webpack configuration is also exported as webpackConfig, and can be modified before calling init().

Licence

MIT License, please see LICENSE for details.

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