Websockets

[stefangutica]

Reasoning

• Allow clients to subscribe to endpoints instead of performing multiple request to fetch updates

Proposed Changes

• Integrate websockets subscription for transactions, blocks and stats

How to test

• Use a client simulation script and subscribe to multiple endpoints with different parameters and multiple topics on each client
  Example:
  client1: subscribeTransactions with payload {from=0, size=10}, subscribeBlocks with payload {from=0, size=2}
  client2: subscribeTransactions with payload {from=0, size=2}, subscribeBlocks with payload {from=0, size=5}, subscribeStats

on each client you should only receive data the same as you would request that specific endpoint with those specific parameters and the server must perform only 1 computation per each room at a specific interval regardless of the number of clients in that room -> a room is unique by topic and payload (filter parameters)

[github-actions]

k6 load testing comparison.
Base Commit Hash: 91f20cc
Target Commit Hash: 5ceec0e

Metric	Base				Target				Diff
	Avg	Max	90	95	Avg	Max	90	95	Avg	Max	90	95
Tokens	60.77	935.04	64.75	68.55	59.09	705.51	63.05	66.21	-2.77% ✅	-24.55% ✅	-2.63% ✅	-3.40% ✅
Mex	60.37	518.07	64.78	68.63	58.49	179.19	63.02	65.99	-3.11% ✅	-65.41% ✅	-2.72% ✅	-3.84% ✅
Pool	60.53	1119.44	64.81	68.34	58.77	309.02	63.01	66.08	-2.91% ✅	-72.39% ✅	-2.78% ✅	-3.30% ✅
Accounts	59.79	245.99	64.74	68.62	58.95	513.09	63.00	66.07	-1.41% ✅	+108.58% 🔴	-2.69% ✅	-3.71% ✅
Nodes	60.86	1097.37	64.77	68.06	59.01	640.73	63.04	66.02	-3.04% ✅	-41.61% ✅	-2.67% ✅	-3.00% ✅
Blocks	68.50	885.89	66.00	74.70	67.68	1057.22	63.73	67.37	-1.19% ✅	+19.34% 🔴	-3.45% ✅	-9.81% ✅
Transactions	76.31	899.85	66.57	77.35	75.31	916.26	64.47	81.99	-1.31% ✅	+1.82% 🔴	-3.16% ✅	+6.00% 🔴
Test Run Duration	60002.08				60002.12

Legend: Avg - Average Response Time, Max - Maximum Response Time, 90 - 90th Percentile, 95 - 95th Percentile
All times are in milliseconds.

[bogdan-rosianu]

make them disabled by default maybe? can be left as a TODO before PR's merging

[stefangutica]

fixed