[Feature Request] Provide easy way to hide output

[lorensr]

Is your feature request related to a problem? Please describe.

In order to be able to continue using my terminal, I have to add > /dev/null 2>&1 & like:

temporal server start-dev > /dev/null 2>&1 &

Describe the solution you'd like

temporal server start-dev -d

like docker-compose's -d flag:

  -d, --detach                    Detached mode: Run containers in the background

A Mac-only alternative solution is #10

Additional context

Previous discussion: temporalio/temporalite-archived#139

[lorensr]

Another option: hide stdout unless they pass -v / --verbose or --debug

[bergundy]

I don't think we need a detached mode, users can run the command in the background if they intend on running it the way you do.
For complete daemonization support, we'd need PID files, a way to get the status of the "current" running server, a command to stop the server, etc..
I don't see a huge benefit in this when it's easy enough to run the server with:

temporal server start-dev &> /dev/null & disown

With docker you don't really have a choice but to provide a -d flag but for a standard applications that runs on the developer's machine there's far less value for built-in daemonization.

Another option: hide stdout unless they pass -v / --verbose or --debug

There's already a configurable log level, we should make sure the log levels are tuned and possibly default to warn.

[lorensr]

Roey requested I don't tell people to do:

temporal server start-dev &> /dev/null & disown

So I'm back onto improving the default output experience ☺️

@feedmeapples would it be easy to:

1. change default log level to warn
2. hide Starting UI server... and Echo output, including ⇨ http server started on 127.0.0.1:8233
3. add this output:

> dist/temporal server start-dev
🆙
Temporal Server is running at: localhost:7233
Web UI is running at: http://localhost:8233

(would also be nice if localhost:7233 and http://localhost:8233 were green)

current output

> dist/temporal server start-dev
{"level":"info","ts":"2023-03-24T16:05:53.195-0400","msg":"Successfully saved cluster metadata.","component":"metadata-initializer","cluster-name":"active","logging-call-at":"fx.go:700"}
{"level":"info","ts":"2023-03-24T16:05:53.196-0400","msg":"Use rpc address 127.0.0.1:7233 for cluster active.","component":"metadata-initializer","logging-call-at":"fx.go:840"}
{"level":"info","ts":"2023-03-24T16:05:53.220-0400","msg":"Created gRPC listener","service":"history","address":"127.0.0.1:49609","logging-call-at":"rpc.go:152"}
{"level":"info","ts":"2023-03-24T16:05:53.223-0400","msg":"Created gRPC listener","service":"matching","address":"127.0.0.1:49611","logging-call-at":"rpc.go:152"}
{"level":"info","ts":"2023-03-24T16:05:53.228-0400","msg":"Created gRPC listener","service":"frontend","address":"127.0.0.1:7233","logging-call-at":"rpc.go:152"}
{"level":"info","ts":"2023-03-24T16:05:53.228-0400","msg":"Service is not requested, skipping initialization.","service":"internal-frontend","logging-call-at":"fx.go:473"}
Starting UI server...
{"level":"info","ts":"2023-03-24T16:05:53.232-0400","msg":"Starting server for services","value":{"frontend":{},"history":{},"matching":{},"worker":{}},"logging-call-at":"server_impl.go:97"}
{"level":"info","ts":"2023-03-24T16:05:53.232-0400","msg":"PProf listen on ","port":49607,"logging-call-at":"pprof.go:73"}

   ____    __
  / __/___/ /  ___
 / _// __/ _ \/ _ \
/___/\__/_//_/\___/ v4.9.0
High performance, minimalist Go web framework
https://echo.labstack.com
____________________________________O/_______
                                    O\
⇨ http server started on 127.0.0.1:8233
{"level":"info","ts":"2023-03-24T16:05:53.236-0400","msg":"Membership heartbeat upserted successfully","service":"history","address":"127.0.0.1","port":49610,"hostId":"47c4c31a-ca7f-11ed-9846-fe34e8f69a25","logging-call-at":"rpMonitor.go:255"}
{"level":"info","ts":"2023-03-24T16:05:53.236-0400","msg":"RuntimeMetricsReporter started","service":"matching","logging-call-at":"runtime.go:138"}
{"level":"info","ts":"2023-03-24T16:05:53.237-0400","msg":"RuntimeMetricsReporter started","service":"frontend","logging-call-at":"runtime.go:138"}
{"level":"info","ts":"2023-03-24T16:05:53.236-0400","msg":"RuntimeMetricsReporter started","service":"worker","logging-call-at":"runtime.go:138"}
{"level":"info","ts":"2023-03-24T16:05:53.237-0400","msg":"bootstrap hosts fetched","service":"history","bootstrap-hostports":"127.0.0.1:49610","logging-call-at":"rpMonitor.go:297"}
{"level":"info","ts":"2023-03-24T16:05:53.237-0400","msg":"Membership heartbeat upserted successfully","service":"matching","address":"127.0.0.1","port":49612,"hostId":"47c6f9b4-ca7f-11ed-9846-fe34e8f69a25","logging-call-at":"rpMonitor.go:255"}
...

[dandavison]

My vote is also not to have a -d flag when standard shell techniques can be used instead.

I don't see a huge benefit in this when it's easy enough to run the server with:
temporal server start-dev &> /dev/null & disown

Expert users can probably choose their own preferred style of redirection. For less expert users, I'd recommend simply telling them to run the server in a different terminal window/tab rather than giving them slightly esoteric shell commands.