workwebui: first path segment in URL cannot contain colon

[Lavode]

Error

When starting the web UI, and subsequently opening / reloading its web UI, the following error is shown:

› workwebui -redis='127.0.0.1:16379' -ns=test
Starting workwebui:
redis =  127.0.0.1:16379
database =  0
namespace =  test
listen =  :5040
ERROR: worker_observations.worker_pool_heartbeats - parse "127.0.0.1:16379": first path segment in URL cannot contain colon

The UI does also not list any pending jobs / worker processes / etc, so it seems to be an actual error.

For reference, the contents of said Redis server right after having started the worker pool:

› redis-cli -h 127.0.0.1 -p 16379
127.0.0.1:16379> KEYS *
1) "test:worker_pools"
2) "test:known_jobs"
3) "test:last_periodic_enqueue"
4) "test:jobs:check_last_replay:max_concurrency"
5) "test:worker_pools:2a56fe07ad1b5106a1d20207"

Reproduce

• Start redis server
• Fire up example shown in README.md (you'll have to fix some missing imports, and unused variables ;))
• Start worker pool
• Enqueue a few jobs
• Start workwebui and open it in a browser

Versions

Go:

› go version
go version go1.14.7 linux/amd64

Redis:

127.0.0.1:16379> INFO
# Server
redis_version:6.0.5

go.mod:

github.com/gocraft/work v0.5.1
github.com/gomodule/redigo v1.8.2

[Lavode]

Right, a bit of digging in the code later I've figured out the cause - a case of unclear documentation.

workwebui uses the DialURL() method of redisgo: https://pkg.go.dev/github.com/gomodule/redigo@v2.0.0+incompatible/redis?tab=doc#DialURL

This one expects a URL according to the following spec: https://www.iana.org/assignments/uri-schemes/prov/redis
As such the example URL in README.md is an incorrect example. Rather one must supply URIs such as the following:

• redis://127.0.0.1:6379
• redis://user:secret@localhost:6379/0?foo=bar&qux=baz
• redis://:6379
  Etc

I'll be submitting a short PR to fix the example in README.md.