[ledger] Ledger cleanups + make a test async #1073

huitseeker · 2021-08-02T21:43:32Z

found while trying to read about / dig into the WAL:

removes unneeded byte conversions,
removes unused, untested functions either in test utils or for which there's a good alternative,
makes Test_Compactor/Compactor_creates_checkpoints_eventually asynchronous but deterministic,
(introduces a minimalistic Observable interface that I know I'll reuse elsewhere, though not in this PR, see Networking test races #1020 )
Simplifies Compactor's start / stop slightly, thanks to @smnzhu 's LifeCycleManager

synzhu · 2021-08-03T06:04:58Z

ledger/complete/wal/compactor.go

 	stopc        chan struct{}
-	wg           sync.WaitGroup
+	lm           *lifecycle.LifecycleManager


ledger/complete/wal/compactor.go

ledger/complete/wal/compactor_test.go

ledger/complete/wal/compactor.go

synzhu

LGTM

synzhu · 2021-08-03T17:08:45Z

ledger/complete/wal/compactor.go

+		for observer := range c.observers {
+			observer.OnComplete()
+		}
+		c.stopc <- struct{}{}


You may be interested in #1077, which will allow you to replace c.stopc as well :)

ramtinms · 2021-08-03T17:11:57Z

ledger/trie.go

@@ -289,7 +281,7 @@ func (p *TrieProof) String() string {
 	interimIndex := 0
 	for j := 0; j < int(p.Steps); j++ {
 		// if bit is set
-		if p.Flags[j/8]&(1<<int(7-j%8)) != 0 {


@tarakby is this change okey?

j is an integer, % has an integer codomain, and j % 8 <= 7 by specification

That's correct, but we can replace this by Bit(p.Falgs, j) using this tool function.

I remembered Tarak recommended something about this part of the code and I was not remembering the details, that's why I asked.

Thanks for flagging @ramtinms. You're right I made changes in the past to the Bit function.

ledger/complete/wal/compactor_test.go

m4ksio · 2021-08-03T20:51:27Z

module/observable/observable.go

@@ -0,0 +1,8 @@
+package observable
+
+type Observable interface {


I wonder if we maybe should use some established library for this - https://github.com/ReactiveX/RxGo
Now the usecase is simple but it might grow

I'm familiar with RxGo and very much in favor, but I don't think we have scope for using it fully as a consequence of this PR alone.

The Observable API I put in modules right now is forward-compatible.

ledger/complete/wal/compactor.go

tarakby

Thanks for the ledger tools and tests clean up!
Minor suggestions.

Out of curiosity, did you use a linter tool to find out the non-needed type casts or was it by manual review ?

tarakby · 2021-08-04T20:06:58Z

ledger/common/encoding/encoding.go

@@ -272,7 +272,7 @@ func DecodeValue(encodedValue []byte) (ledger.Value, error) {
 }

 func decodeValue(inp []byte) (ledger.Value, error) {
-	return ledger.Value(inp), nil
+	return inp, nil


We could delete the function in this case. It also never errors.

tarakby · 2021-08-04T20:20:41Z

ledger/trie.go

@@ -289,7 +281,7 @@ func (p *TrieProof) String() string {
 	interimIndex := 0
 	for j := 0; j < int(p.Steps); j++ {
 		// if bit is set
-		if p.Flags[j/8]&(1<<int(7-j%8)) != 0 {


That's correct, but we can replace this by Bit(p.Falgs, j) using this tool function.

huitseeker · 2021-08-04T22:39:33Z

@tarakby I blasted the ones my IDE highlighted, but if we want to put that in CI, golang-ci supports unconvert: https://golangci-lint.run/usage/linters/

m4ksio

Looks good now

superseded by defaultHashes at init

See //reactivex.io/documentation/observable.html

- introduces a most minima form of the Observable interface to modules/observable See: http://reactivex.io/documentation/observable.html - make the compactor test asynchronous

This reverts commit 845a00b. Reasons for reversal: - provided impetus for clearing out races (onflow#1073, onflow#1095) - network tests now pass with race detector on! - but those timings are preposterous

huitseeker requested review from m4ksio, ramtinms and tarakby August 2, 2021 21:43

huitseeker requested a review from AlexHentschel as a code owner August 2, 2021 21:43

huitseeker force-pushed the ledger-warts branch 2 times, most recently from 738f918 to bb1a8ea Compare August 2, 2021 21:53

synzhu reviewed Aug 3, 2021

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huitseeker force-pushed the ledger-warts branch from bb1a8ea to 52668c1 Compare August 3, 2021 13:47

synzhu approved these changes Aug 3, 2021

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ramtinms reviewed Aug 3, 2021

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huitseeker force-pushed the ledger-warts branch from 52668c1 to c59c9cb Compare August 3, 2021 21:37

m4ksio reviewed Aug 4, 2021

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huitseeker force-pushed the ledger-warts branch from c59c9cb to ec51229 Compare August 4, 2021 19:20

tarakby reviewed Aug 4, 2021

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m4ksio approved these changes Aug 5, 2021

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huitseeker added 7 commits August 6, 2021 09:42

Remove needless byte conversions

0c1e83f

Remove unused GetDefaultHashes

cf5bf8a

superseded by defaultHashes at init

Remove 2x unused functions in testutils

ec1d12d

Refactor the Compactor's start / stop cycle to LifecycleManager

7030f31

Introduces a minimalistic Observer / Observable interface

299f3bb

See //reactivex.io/documentation/observable.html

Remove time-dependency (and flakiness) on the compactor test

e5e6435

- introduces a most minima form of the Observable interface to modules/observable See: http://reactivex.io/documentation/observable.html - make the compactor test asynchronous

Clean up after the simplification of decodeValue

cc95354

huitseeker force-pushed the ledger-warts branch from ec51229 to cc95354 Compare August 6, 2021 13:42

huitseeker merged commit 3029e6f into onflow:master Aug 6, 2021

huitseeker mentioned this pull request Aug 6, 2021

[ledger] Remove stopc in the compactor (using Lifecycle) #1093

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[ledger] Ledger cleanups + make a test async #1073

[ledger] Ledger cleanups + make a test async #1073

huitseeker commented Aug 2, 2021

synzhu Aug 3, 2021

synzhu left a comment

synzhu Aug 3, 2021

ramtinms Aug 3, 2021

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huitseeker commented Aug 4, 2021

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		@@ -0,0 +1,8 @@
		package observable

		type Observable interface {

[ledger] Ledger cleanups + make a test async #1073

[ledger] Ledger cleanups + make a test async #1073

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