Add lightclient getHeadUpdate route

[dapplion]

Motivation

When the lightclient is done syncing, there's a delay until the first SSE event happens. Worst case this could be a 12s wait. Also this route offers an alternative if SSE are not available.

Description

• Add lightclient getHeadUpdate route

[codeclimate]

Code Climate has analyzed commit 7f20e01 and detected 1 issue on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	1

View more on Code Climate.

[github-actions]

Performance Report

✔️ no performance regression detected

Full benchmark results

Benchmark suite	Current: 6cb57f7	Previous: 1f2fdf8	Ratio
BeaconState.hashTreeRoot - No change	710.00 ns/op	779.00 ns/op	0.91
BeaconState.hashTreeRoot - 1 full validator	112.08 us/op	95.101 us/op	1.18
BeaconState.hashTreeRoot - 32 full validator	1.4574 ms/op	1.4931 ms/op	0.98
BeaconState.hashTreeRoot - 512 full validator	16.959 ms/op	18.441 ms/op	0.92
BeaconState.hashTreeRoot - 1 validator.effectiveBalance	100.97 us/op	99.135 us/op	1.02
BeaconState.hashTreeRoot - 32 validator.effectiveBalance	1.5989 ms/op	1.5815 ms/op	1.01
BeaconState.hashTreeRoot - 512 validator.effectiveBalance	20.266 ms/op	20.856 ms/op	0.97
BeaconState.hashTreeRoot - 1 balances	70.636 us/op	71.838 us/op	0.98
BeaconState.hashTreeRoot - 32 balances	586.30 us/op	609.23 us/op	0.96
BeaconState.hashTreeRoot - 512 balances	5.3782 ms/op	5.5959 ms/op	0.96
BeaconState.hashTreeRoot - 250000 balances	103.80 ms/op	104.25 ms/op	1.00
processSlot - 1 slots	50.905 us/op	50.985 us/op	1.00
processSlot - 32 slots	2.6461 ms/op	2.5886 ms/op	1.02
getCommitteeAssignments - req 1 vs - 250000 vc	5.3505 ms/op	5.4487 ms/op	0.98
getCommitteeAssignments - req 100 vs - 250000 vc	7.7994 ms/op	7.8893 ms/op	0.99
getCommitteeAssignments - req 1000 vs - 250000 vc	8.0796 ms/op	8.4165 ms/op	0.96
computeProposers - vc 250000	25.960 ms/op	26.837 ms/op	0.97
computeEpochShuffling - vc 250000	202.01 ms/op	209.65 ms/op	0.96
getNextSyncCommittee - vc 250000	414.71 ms/op	440.55 ms/op	0.94
altair processAttestation - 250000 vs - 7PWei normalcase	43.391 ms/op	38.903 ms/op	1.12
altair processAttestation - 250000 vs - 7PWei worstcase	51.969 ms/op	47.638 ms/op	1.09
altair processAttestation - setStatus - 1/6 committees join	11.912 ms/op	9.3804 ms/op	1.27
altair processAttestation - setStatus - 1/3 committees join	25.066 ms/op	19.671 ms/op	1.27
altair processAttestation - setStatus - 1/2 committees join	37.567 ms/op	35.119 ms/op	1.07
altair processAttestation - setStatus - 2/3 committees join	50.298 ms/op	41.433 ms/op	1.21
altair processAttestation - setStatus - 4/5 committees join	59.482 ms/op	51.082 ms/op	1.16
altair processAttestation - setStatus - 100% committees join	76.694 ms/op	67.320 ms/op	1.14
altair processAttestation - updateEpochParticipants - 1/6 committees join	13.034 ms/op	11.016 ms/op	1.18
altair processAttestation - updateEpochParticipants - 1/3 committees join	24.805 ms/op	20.473 ms/op	1.21
altair processAttestation - updateEpochParticipants - 1/2 committees join	28.195 ms/op	25.175 ms/op	1.12
altair processAttestation - updateEpochParticipants - 2/3 committees join	30.923 ms/op	27.198 ms/op	1.14
altair processAttestation - updateEpochParticipants - 4/5 committees join	37.068 ms/op	32.984 ms/op	1.12
altair processAttestation - updateEpochParticipants - 100% committees join	34.327 ms/op	29.971 ms/op	1.15
altair processAttestation - updateAllStatus	20.996 ms/op	21.606 ms/op	0.97
altair processBlock - 250000 vs - 7PWei normalcase	54.558 ms/op	49.581 ms/op	1.10
altair processBlock - 250000 vs - 7PWei worstcase	135.99 ms/op	134.41 ms/op	1.01
altair processEpoch - mainnet_e81889	1.0723 s/op	1.0930 s/op	0.98
mainnet_e81889 - altair beforeProcessEpoch	320.16 ms/op	368.86 ms/op	0.87
mainnet_e81889 - altair processJustificationAndFinalization	115.75 us/op	138.44 us/op	0.84
mainnet_e81889 - altair processInactivityUpdates	20.514 ms/op	18.057 ms/op	1.14
mainnet_e81889 - altair processRewardsAndPenalties	132.91 ms/op	120.32 ms/op	1.10
mainnet_e81889 - altair processRegistryUpdates	21.298 us/op	23.219 us/op	0.92
mainnet_e81889 - altair processSlashings	5.8060 us/op	6.9590 us/op	0.83
mainnet_e81889 - altair processEth1DataReset	6.3410 us/op	6.0890 us/op	1.04
mainnet_e81889 - altair processEffectiveBalanceUpdates	13.257 ms/op	14.411 ms/op	0.92
mainnet_e81889 - altair processSlashingsReset	35.047 us/op	34.941 us/op	1.00
mainnet_e81889 - altair processRandaoMixesReset	41.971 us/op	41.373 us/op	1.01
mainnet_e81889 - altair processHistoricalRootsUpdate	9.8120 us/op	8.3760 us/op	1.17
mainnet_e81889 - altair processParticipationFlagUpdates	171.98 ms/op	108.99 ms/op	1.58
mainnet_e81889 - altair processSyncCommitteeUpdates	5.2700 us/op	5.8890 us/op	0.89
mainnet_e81889 - altair afterProcessEpoch	243.13 ms/op	258.72 ms/op	0.94
altair processInactivityUpdates - 250000 normalcase	71.010 ms/op	71.507 ms/op	0.99
altair processInactivityUpdates - 250000 worstcase	71.838 ms/op	73.405 ms/op	0.98
altair processParticipationFlagUpdates - 250000 anycase	98.931 ms/op	115.37 ms/op	0.86
altair processRewardsAndPenalties - 250000 normalcase	118.67 ms/op	137.44 ms/op	0.86
altair processRewardsAndPenalties - 250000 worstcase	141.46 ms/op	124.19 ms/op	1.14
altair processSyncCommitteeUpdates - 250000	428.63 ms/op	466.88 ms/op	0.92
Tree 40 250000 create	552.86 ms/op	533.84 ms/op	1.04
Tree 40 250000 get(125000)	336.15 ns/op	333.83 ns/op	1.01
Tree 40 250000 set(125000)	1.8151 us/op	1.7335 us/op	1.05
Tree 40 250000 toArray()	43.191 ms/op	48.667 ms/op	0.89
Tree 40 250000 iterate all - toArray() + loop	43.744 ms/op	41.197 ms/op	1.06
Tree 40 250000 iterate all - get(i)	125.35 ms/op	131.27 ms/op	0.95
MutableVector 250000 create	25.913 ms/op	19.697 ms/op	1.32
MutableVector 250000 get(125000)	14.961 ns/op	16.010 ns/op	0.93
MutableVector 250000 set(125000)	600.20 ns/op	532.88 ns/op	1.13
MutableVector 250000 toArray()	9.0777 ms/op	8.4069 ms/op	1.08
MutableVector 250000 iterate all - toArray() + loop	9.0700 ms/op	8.6208 ms/op	1.05
MutableVector 250000 iterate all - get(i)	3.8206 ms/op	3.8389 ms/op	1.00
Array 250000 create	5.4439 ms/op	5.7680 ms/op	0.94
Array 250000 clone - spread	2.0870 ms/op	2.0633 ms/op	1.01
Array 250000 get(125000)	1.0280 ns/op	1.0060 ns/op	1.02
Array 250000 set(125000)	1.0160 ns/op	0.98000 ns/op	1.04
Array 250000 iterate all - loop	143.16 us/op	150.98 us/op	0.95
aggregationBits - 2048 els - readonlyValues	251.73 us/op	231.13 us/op	1.09
aggregationBits - 2048 els - zipIndexesInBitList	38.147 us/op	34.290 us/op	1.11
regular array get 100000 times	57.323 us/op	62.427 us/op	0.92
wrappedArray get 100000 times	55.539 us/op	62.821 us/op	0.88
arrayWithProxy get 100000 times	33.587 ms/op	34.044 ms/op	0.99
ssz.Root.equals	1.2190 us/op	1.4370 us/op	0.85
ssz.Root.equals with valueOf()	1.4700 us/op	1.4820 us/op	0.99
byteArrayEquals with valueOf()	1.4320 us/op	1.4460 us/op	0.99
phase0 processBlock - 250000 vs - 7PWei normalcase	12.431 ms/op	12.334 ms/op	1.01
phase0 processBlock - 250000 vs - 7PWei worstcase	89.962 ms/op	99.087 ms/op	0.91
phase0 afterProcessEpoch - 250000 vs - 7PWei	217.03 ms/op	237.44 ms/op	0.91
phase0 beforeProcessEpoch - 250000 vs - 7PWei	672.60 ms/op	695.42 ms/op	0.97
phase0 processEpoch - mainnet_e58758	939.33 ms/op	896.30 ms/op	1.05
mainnet_e58758 - phase0 beforeProcessEpoch	537.83 ms/op	548.02 ms/op	0.98
mainnet_e58758 - phase0 processJustificationAndFinalization	124.91 us/op	112.21 us/op	1.11
mainnet_e58758 - phase0 processRewardsAndPenalties	86.681 ms/op	123.09 ms/op	0.70
mainnet_e58758 - phase0 processRegistryUpdates	84.328 us/op	81.252 us/op	1.04
mainnet_e58758 - phase0 processSlashings	7.8080 us/op	7.4270 us/op	1.05
mainnet_e58758 - phase0 processEth1DataReset	5.1010 us/op	6.0040 us/op	0.85
mainnet_e58758 - phase0 processEffectiveBalanceUpdates	10.886 ms/op	11.663 ms/op	0.93
mainnet_e58758 - phase0 processSlashingsReset	29.068 us/op	31.029 us/op	0.94
mainnet_e58758 - phase0 processRandaoMixesReset	39.563 us/op	38.927 us/op	1.02
mainnet_e58758 - phase0 processHistoricalRootsUpdate	7.3280 us/op	8.2000 us/op	0.89
mainnet_e58758 - phase0 processParticipationRecordUpdates	28.133 us/op	28.689 us/op	0.98
mainnet_e58758 - phase0 afterProcessEpoch	197.29 ms/op	209.40 ms/op	0.94
phase0 processEffectiveBalanceUpdates - 250000 normalcase	12.526 ms/op	12.885 ms/op	0.97
phase0 processEffectiveBalanceUpdates - 250000 worstcase 0.5	1.4591 s/op	1.3265 s/op	1.10
phase0 processRegistryUpdates - 250000 normalcase	87.038 us/op	85.354 us/op	1.02
phase0 processRegistryUpdates - 250000 badcase_full_deposits	3.5512 ms/op	3.2299 ms/op	1.10
phase0 processRegistryUpdates - 250000 worstcase 0.5	2.0221 s/op	1.8480 s/op	1.09
phase0 getAttestationDeltas - 250000 normalcase	41.312 ms/op	36.909 ms/op	1.12
phase0 getAttestationDeltas - 250000 worstcase	41.527 ms/op	37.212 ms/op	1.12
phase0 processSlashings - 250000 worstcase	44.128 ms/op	33.815 ms/op	1.30
shuffle list - 16384 els	14.610 ms/op	14.862 ms/op	0.98
shuffle list - 250000 els	197.74 ms/op	208.68 ms/op	0.95
getEffectiveBalances - 250000 vs - 7PWei	16.997 ms/op	11.739 ms/op	1.45
computeDeltas	4.0121 ms/op	3.8797 ms/op	1.03
getPubkeys - index2pubkey - req 1000 vs - 250000 vc	2.2260 ms/op	2.2895 ms/op	0.97
getPubkeys - validatorsArr - req 1000 vs - 250000 vc	814.14 us/op	770.16 us/op	1.06
BLS verify - blst-native	2.1931 ms/op	2.3054 ms/op	0.95
BLS verifyMultipleSignatures 3 - blst-native	4.5173 ms/op	4.6395 ms/op	0.97
BLS verifyMultipleSignatures 8 - blst-native	10.183 ms/op	9.9059 ms/op	1.03
BLS verifyMultipleSignatures 32 - blst-native	36.002 ms/op	36.590 ms/op	0.98
BLS aggregatePubkeys 32 - blst-native	46.381 us/op	48.784 us/op	0.95
BLS aggregatePubkeys 128 - blst-native	181.78 us/op	192.23 us/op	0.95
getAttestationsForBlock	101.59 ms/op	91.305 ms/op	1.11
CheckpointStateCache - add get delete	19.592 us/op	18.097 us/op	1.08
validate gossip signedAggregateAndProof - struct	5.5540 ms/op	5.5338 ms/op	1.00
validate gossip signedAggregateAndProof - treeBacked	5.5563 ms/op	5.4857 ms/op	1.01
validate gossip attestation - struct	2.6844 ms/op	2.6200 ms/op	1.02
validate gossip attestation - treeBacked	2.7702 ms/op	2.6078 ms/op	1.06
Object access 1 prop	0.44400 ns/op	0.37000 ns/op	1.20
Map access 1 prop	0.36600 ns/op	0.33100 ns/op	1.11
Object get x1000	17.406 ns/op	17.245 ns/op	1.01
Map get x1000	1.0290 ns/op	1.0660 ns/op	0.97
Object set x1000	124.89 ns/op	103.28 ns/op	1.21
Map set x1000	88.712 ns/op	72.431 ns/op	1.22
Return object 10000 times	0.42870 ns/op	0.44010 ns/op	0.97
Throw Error 10000 times	7.1800 us/op	7.0910 us/op	1.01

by benchmarkbot/action

[codecov]

Codecov Report

Merging #3481 (6cb57f7) into master (b01e3de) will increase coverage by 0.06%.
The diff coverage is n/a.

❗ Current head 6cb57f7 differs from pull request most recent head 7f20e01. Consider uploading reports for the commit 7f20e01 to get more accurate results

@@            Coverage Diff             @@
##           master    #3481      +/-   ##
==========================================
+ Coverage   37.83%   37.89%   +0.06%     
==========================================
  Files         307      307              
  Lines        8095     8111      +16     
  Branches     1246     1248       +2     
==========================================
+ Hits         3063     3074      +11     
- Misses       4880     4887       +7     
+ Partials      152      150       -2