protofsm: update GR Manager usage and start using structured logging #9342

ellemouton · 2024-12-10T05:46:08Z

This PR touches the protofsm package for 2 reasons:

update to use the latest GoroutineManager API introduced in: fn: Remove ctx from GoroutineManager constructor #9341
Update the StateMachine to thread a context through and to take a context via its API methods where it makes sense. With this update, logging can also be switched to the new structured logging pattern which allows us to avoid having to specify the FSM(%V) string for each log line

Depends on: btcsuite/btclog#20

coderabbitai · 2024-12-10T05:46:15Z

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go.mod

protofsm/state_machine.go

Roasbeef · 2024-12-10T10:02:58Z

protofsm/state_machine.go

@@ -101,8 +102,8 @@ type DaemonAdapters interface {
 	// TODO(roasbeef): could abstract further?
 	RegisterConfirmationsNtfn(txid *chainhash.Hash, pkScript []byte,
 		numConfs, heightHint uint32,
-		opts ...chainntnfs.NotifierOption,


Prob the main stylistic diff in the codebase rn, but I prefer this option as it makes it clearer where the args end, and the return value starts.

Imo that only holds if the return values can in-fact fit on one line which is not always the case.
Personally I find the ) { on the unindented line strange

Roasbeef · 2024-12-10T10:03:57Z

protofsm/state_machine.go

-				daemonEvent.TargetPeer.SerializeCompressed(),
-				lnutils.SpewLogClosure(daemonEvent.Msgs),
-			)
+			log.DebugS(ctx, "Sending message",


Do you have a print sample of the before and after here re formatting?

2024-12-10 13:20:44.552 [DBG]: FSM(test) Starting state machine 2024-12-10 13:20:44.552 [DBG]: FSM(test) Sending event event=(*protofsm.emitInternal)(0x1045f1240)({ }) 2024-12-10 13:20:44.552 [DBG]: FSM(test) Applying new event event=(*protofsm.emitInternal)(0x1045f1240)({ }) 2024-12-10 13:20:44.552 [DBG]: FSM(test) Processing event event=(*protofsm.emitInternal)(0x1045f1240)({ }) 2024-12-10 13:20:44.552 [DBG]: FSM(test) Adding new internal event to queue event !BADKEY=(*protofsm.goToFin)(0x1045f1240)({ }) 2024-12-10 13:20:44.552 [INF]: FSM(test) State transition from_state=*protofsm.dummyStateStart to_state=*protofsm.dummyStateStart 2024-12-10 13:20:44.552 [DBG]: FSM(test) Processing event event=(*protofsm.goToFin)(0x1045f1240)({ }) 2024-12-10 13:20:44.552 [INF]: FSM(test) State transition from_state=*protofsm.dummyStateStart to_state=*protofsm.dummyStateFin

Roasbeef · 2024-12-10T10:04:57Z

protofsm/state_machine.go

-					log.Debugf("FSM(%v): processing "+
-						"daemon %v daemon events",
-						s.cfg.Env.Name(), len(dEvents))
+					log.DebugS(ctx, "Processing daemon events",


Is this upper case construct something new we're attempting to make standard with the new logging format?

I think in general we go for log lines that start with upper case? searching around the code base, i can see that most of our log lines start with an upper case letter

Roasbeef · 2024-12-10T10:06:00Z

protofsm/state_machine.go

+	ctx context.Context) context.Context {
+
+	return btclog.WithCtx(ctx,
+		btclog.Fmt("fsm_name", s.cfg.Env.Name())) //nolint:govet


Is there anyway we can keep the old prefix nature? At least when scanning, IMO it's useful for it to be at the very start as depending on the size of your editor/viewport, the end of the line may require moving the cursor to actually view.

as the library stands today, no. But what can be done is: to create a prefixed logger in NewStateMachine and then carry that around in the StateMachine struct. Then we just need to remember to do s.log.* for log lines.

shall we do that instead here?

ok i've added a temporary commit at the end that does it this way. Let me know if you think this is ok and i can squash in the change.

The logs now look like this:

2024-12-10 13:20:44.552 [DBG]: FSM(test) Starting state machine 2024-12-10 13:20:44.552 [DBG]: FSM(test) Sending event event=(*protofsm.emitInternal)(0x1045f1240)({ }) 2024-12-10 13:20:44.552 [DBG]: FSM(test) Applying new event event=(*protofsm.emitInternal)(0x1045f1240)({ }) 2024-12-10 13:20:44.552 [DBG]: FSM(test) Processing event event=(*protofsm.emitInternal)(0x1045f1240)({ }) 2024-12-10 13:20:44.552 [DBG]: FSM(test) Adding new internal event to queue event !BADKEY=(*protofsm.goToFin)(0x1045f1240)({ }) 2024-12-10 13:20:44.552 [INF]: FSM(test) State transition from_state=*protofsm.dummyStateStart to_state=*protofsm.dummyStateStart 2024-12-10 13:20:44.552 [DBG]: FSM(test) Processing event event=(*protofsm.goToFin)(0x1045f1240)({ }) 2024-12-10 13:20:44.552 [INF]: FSM(test) State transition from_state=*protofsm.dummyStateStart to_state=*protofsm.dummyStateFin

squashed in the temp commit

ellemouton

Thanks for taking a look @Roasbeef - responded to your comments

protofsm/state_machine.go

ellemouton · 2024-12-10T10:12:21Z

protofsm/state_machine.go

-					log.Debugf("FSM(%v): processing "+
-						"daemon %v daemon events",
-						s.cfg.Env.Name(), len(dEvents))
+					log.DebugS(ctx, "Processing daemon events",


I think in general we go for log lines that start with upper case? searching around the code base, i can see that most of our log lines start with an upper case letter

ellemouton · 2024-12-10T10:13:59Z

protofsm/state_machine.go

+	ctx context.Context) context.Context {
+
+	return btclog.WithCtx(ctx,
+		btclog.Fmt("fsm_name", s.cfg.Env.Name())) //nolint:govet


as the library stands today, no. But what can be done is: to create a prefixed logger in NewStateMachine and then carry that around in the StateMachine struct. Then we just need to remember to do s.log.* for log lines.

shall we do that instead here?

ellemouton

squashed in the prefixed logging change & also added the commit for using a pointer to the GM instead as discussed @Roasbeef. PTAL 🙏

This bump includes a fix which prevents attribute value quoting if the value string contains a newline character. This is so that if we call spew.DumpS(), the output will stay nicely formatted. The update also includes a couple more Hex helpers which we can make use of now.

Update to use the latest version of the GoroutineManager which takes a context via the `Go` method instead of the constructor.

So that we dont have to remember to add the `FSM(%v)` prefix each time we write a log line.

build/version.go

Roasbeef

LGTM 🩴

Roasbeef · 2024-12-18T13:40:36Z

protofsm/state_machine.go

@@ -197,7 +200,10 @@ func NewStateMachine[Event any, Env Environment](
 	cfg StateMachineCfg[Event, Env]) StateMachine[Event, Env] {

 	return StateMachine[Event, Env]{
-		cfg:            cfg,
+		cfg: cfg,
+		log: log.WithPrefix(


lightninglabs-deploy · 2024-12-25T13:51:29Z

@bhandras: review reminder
@ellemouton, remember to re-request review from reviewers when ready

ellemouton force-pushed the slogProtofsm branch from 8c9dad2 to 2fefda4 Compare December 10, 2024 08:32

Roasbeef requested changes Dec 10, 2024

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ellemouton commented Dec 10, 2024

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ellemouton force-pushed the slogProtofsm branch from 2fefda4 to a86da09 Compare December 10, 2024 11:15

ellemouton requested a review from Roasbeef December 10, 2024 11:23

ellemouton force-pushed the slogProtofsm branch 2 times, most recently from b0afb02 to d9194ed Compare December 12, 2024 08:02

ellemouton commented Dec 12, 2024

View reviewed changes

ellemouton mentioned this pull request Dec 12, 2024

fn: Remove ctx from GoroutineManager constructor #9341

Merged

ellemouton added 6 commits December 12, 2024 11:06

protofsm: use updated GoroutineManager API

bc3cd32

Update to use the latest version of the GoroutineManager which takes a context via the `Go` method instead of the constructor.

protofsm: use prefixed logger for StateMachine

64e2e94

So that we dont have to remember to add the `FSM(%v)` prefix each time we write a log line.

protofsm: use structured logging

aa8bb29

protofsm: use pointer to GoroutineManager

d0144f2

docs: add release notes entry

2625e95

ellemouton force-pushed the slogProtofsm branch from d9194ed to 2625e95 Compare December 12, 2024 09:08

guggero reviewed Dec 12, 2024

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build/version.go Show resolved Hide resolved

saubyk requested a review from bhandras December 12, 2024 15:21

This was referenced Dec 13, 2024

htlcswitch+go.mod: use updated fn.ContextGuard #9344

Open

htlcswitch: use fn.GoroutineManager #9140

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Roasbeef approved these changes Dec 18, 2024

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protofsm: update GR Manager usage and start using structured logging #9342

protofsm: update GR Manager usage and start using structured logging #9342

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protofsm: update GR Manager usage and start using structured logging #9342

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