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zhangwenjian
94163f9afb
The per-tenant setup ended with `defer crontab.Stop()` on the line above
`select {}`. The select never returned, so the deferred call was unreachable
for the life of the process: the scheduler had never once been stopped. And
because setup never returned, the `for k, db := range dbs` loop in Setup never
reached its second iteration - with several tenant databases configured, only
whichever one came first out of the map ever got a scheduler at all.
Both fall out of deleting the select, which was blocking for nothing: cron.Start
is `go c.run()` and has never needed anything to hold the caller.
The stop becomes a BeforeExit callback. cron.Stop returns a context that closes
once the jobs already running have finished, so the shutdown budget has
something real to bound - and giving up on that wait leaves those jobs running
until the process exits, which is better than holding the whole shutdown open
for one job that will not end.
Startup moves from a bare goroutine in run() onto AfterListen. Two reasons: the
phase runs behind core's panic guard, which does not reach across a goroutine
boundary, so a panic while loading jobs used to take the process down; and the
jobs it starts can call the API, which is only true once the socket is
accepting. It can be synchronous now precisely because setup returns.
Tested where it can be: startCrontab is split out so a scheduler can be started
with no database in sight. The job runs every second; after RunShutdown, two
and a half seconds of silence is the assertion. The counter-proof - registering
no callback, which is what this commit replaces - compiles and reports "the job
fired 2 more times after shutdown".
There is one test, not several, because BeforeExit closes to further
registration once it has run; a second RunShutdown in the same binary would
find an empty registry and pass while proving nothing.
**The multi-tenant half has no test.** setup needs a *gorm.DB per tenant before
it reaches the line that was blocking, and this repository's CI has no database
- `make build` is CGO_ENABLED=0 with no sqlite tag. It is the same defect
though: the loop could not advance past a call that never returned.