Temporal Web UI

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_CONFIG_PATH	Path to config file, see configurations	./server/config.yml
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_SESSION_SECRET	Secret used to hash the session with HMAC	"ensure secret in production"
TEMPORAL_EXTERNAL_SCRIPTS	Additional JavaScript tags to serve in the UI

Optional TLS configuration variables:

Variable	Description	Default
TEMPORAL_TLS_CERT_PATH	Certificate for the server to validate the client (web) identity
TEMPORAL_TLS_KEY_PATH	Private key for secure communication with the server
TEMPORAL_TLS_CA_PATH	Certificate authority (CA) certificate for the validation of server
TEMPORAL_TLS_ENABLE_HOST_VERIFICATION	Enables verification of the server certificate	true
TEMPORAL_TLS_SERVER_NAME	Target server that is used for TLS host verification

To enable mutual TLS, you need to specify TEMPORAL_TLS_KEY_PATH and TEMPORAL_TLS_CERT_PATH.
For server-side TLS you need to specify only TEMPORAL_TLS_CA_PATH.

By default we will also verify your server hostname, matching it to TEMPORAL_TLS_SERVER_NAME. You can turn this off by setting TEMPORAL_TLS_ENABLE_HOST_VERIFICATION to false.

Configuring Authentication (optional)

⚠️ This is currently a beta feature, please report any and all issues to us!

Since v1.3, Temporal Web offers optional OAuth SSO authentication. You can enable it in 2 steps:

Edit the server/config.yml file:
```
auth:
  enabled: true # Temporal Web checks this first before reading your provider config
  providers:
      - label: 'google oidc'                        # for internal use; in future may expose as button text
        type: oidc                                  # for futureproofing; only oidc is supported today
        issuer: https://accounts.google.com
        client_id: xxxxxxxxxx-xxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com
        client_secret: xxxxxxxxxxxxxxxxxxxxxxx
        scope: openid profile email
        audience: temporal # identifier of the audience for an issued token (optional)
        callback_base_uri: http://localhost:8088
```
Providing config.yml to Docker image

If you are running Temporal Web from the docker image, you can provide your external config.yml to docker to override the internal config. Create config.yml file on your machine, for example at ~/Desktop/config.yml. Start the docker image, providing the path to your config.yml file using external volume flag (-v). Leave the path after the semicolon as is:
```
docker run --network host -v ~/Desktop/config.yml:/usr/app/server/config.yml temporalio/web:latest
```
In future, multiple Oauth providers may be supported, however for now we only read the first Oauth provider under the providers key above.

Common Oauth Providers and their docs:
- Google: https://developers.google.com/identity/protocols/oauth2/openid-connect
- Auth0: https://auth0.com/docs/protocols/configure-okta-as-oauth2-identity-provider
- Okta: https://help.okta.com/en/prod/Content/Topics/Apps/Apps_App_Integration_Wizard_OIDC.htm
  Troubleshooting note for Okta users:
  Some providers like Okta, have a race condition that may cause logins to occasionally fail. You can get around this by providing the full URL to the `openid-configuration` path as part of the `issuer` parameter:
```
  auth:
    enabled: true
    providers:
        - label: 'okta dev'
          type: oidc
          issuer: https://dev-xxxxxxx.okta.com/.well-known/openid-configuration
          ...
```
- Keycloak: https://www.keycloak.org/getting-started/getting-started-docker
- please feel free to PR or request more help on the Temporal Web repo
You will need to provide a redirect URL to your Oauth Provider. If you are hosting Temporal Web at http://localhost:8088 (this is configured by callback_base_uri in server/config.yml), then it is http://localhost:8088/auth/sso_callback.
- By default, Temporal Web asks for 3 scopes, make sure your provider recognizes these or you may see scope-related errors:
  - openid required by some OIDC providers like auth0
  - profile for name
  - email for email

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.

pdcalado/web