Provide a simple program to inject arbitrary messages in the Hydra network

[abailly-iohk]

This PR is the outcome of my experiments implementing a network injector to "attack" a Hydra cluster and DoS a Head which lead to catastrophic demo on July 27th. It provides a hydra-net executable that can connect to any node and inject ReqSn messages. Of course, because the message is now signed it does not lead to the Head being stalled anymore, unless the signing key of one of the Hydra head participants are compromised.

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• CHANGELOG updated or not needed
• Documentation updated or not needed
• Haddocks updated or not needed
• No new TODOs introduced or explained herafter

[github-actions]

Test Results

359 tests  ±0   354 ✔️ ±0   19m 46s ⏱️ - 3m 21s
119 suites ±0       5 💤 ±0 
    6 files   ±0       0 ❌ ±0 

Results for commit a3c07b7. ± Comparison against base commit d2efe7c.

♻️ This comment has been updated with latest results.

[github-actions]

Transactions Costs

Sizes and execution budgets for Hydra protocol transactions. Note that unlisted parameters are currently using arbitrary values and results are not fully deterministic and comparable to previous runs.

Metadata
Generated at	2023-08-07 17:37:59.916358102 UTC
Max. memory units	14000000
Max. CPU units	10000000000
Max. tx size (kB)	16384

Script summary

Name	Hash	Size (Bytes)
νInitial	7ceb53f05e444cfdabfd0a37a0590090066da457a1f1db30d613b8bd	4289
νCommit	70e70fc13217bfde96932956656c1d540a743b1588c845ca09dc3723	2124
νHead	cda51d313c1c8285b6925ce2413def012db27f544e2bbd79b8173000	9185
μHead	1c0b665fc49bc2e9e2ce4e8252c8f37fe84dd75bd8e086abfdb92685*	4149

• The minting policy hash is only usable for comparison. As the script is parameterized, the actual script is unique per Head.

Cost of Init Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	4740	11.99	4.67	0.49
2	4948	17.67	6.89	0.56
3	5153	17.19	6.64	0.56
5	5562	25.12	9.70	0.67
10	6585	36.47	13.96	0.84
36	11919	98.22	37.20	1.74

Cost of Commit Transaction

This is using ada-only outputs for better comparability.

UTxO	Tx size	% max Mem	% max CPU	Min fee ₳
1	599	15.06	5.76	0.34
2	787	19.66	7.73	0.40
3	972	24.76	9.87	0.46
5	1345	36.28	14.63	0.61
10	2288	72.00	28.94	1.04
13	2852	98.24	39.22	1.35

Cost of CollectCom Transaction

Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	57	815	28.09	10.90	0.49
2	113	1133	43.86	17.14	0.68
3	169	1455	61.89	24.35	0.89
4	227	1775	82.43	32.58	1.13

Cost of Close Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	639	18.98	8.46	0.39
2	812	20.08	9.60	0.42
3	969	21.78	10.97	0.45
5	1299	24.57	13.49	0.50
10	2132	31.27	19.66	0.64
50	8721	87.25	69.99	1.74

Cost of Contest Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	669	24.87	10.67	0.46
2	840	26.59	12.04	0.49
3	1006	27.88	13.24	0.52
5	1335	31.75	16.15	0.58
10	2161	40.34	23.01	0.74
44	7764	98.37	69.48	1.79

Cost of Abort Transaction

Some variation because of random mixture of still initial and already committed outputs.

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	4857	22.60	9.44	0.61
2	5177	36.97	15.65	0.79
3	5497	54.22	23.14	1.00
4	5676	69.31	29.49	1.17
5	6139	97.57	41.97	1.51

Cost of FanOut Transaction

Involves spending head output and burning head tokens. Uses ada-only UTxO for better comparability.

Parties	UTxO	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
5	0	0	4765	8.72	3.59	0.46
5	1	57	4801	10.12	4.41	0.48
5	5	285	4945	15.71	7.72	0.55
5	10	568	5120	22.69	11.84	0.64
5	20	1138	5483	36.67	20.11	0.83
5	30	1707	5842	50.65	28.38	1.02
5	40	2277	6201	64.63	36.65	1.21
5	50	2847	6560	78.62	44.92	1.40
5	65	3701	7104	99.62	57.34	1.68

End-To-End Benchmark Results

This page is intended to collect the latest end-to-end benchmarks results produced by Hydra's Continuous Integration system from the latest master code.

Please take those results with a grain of salt as they are currently produced from very limited cloud VMs and not controlled hardware. Instead of focusing on the absolute results, the emphasis should be on relative results, eg. how the timings for a scenario evolve as the code changes.

Generated at 2023-08-07 17:31:56.217725976 UTC

3-nodes Scenario

A rather typical setup, with 3 nodes forming a Hydra head.

Number of nodes	3
Number of txs	900
Avg. Confirmation Time (ms)	104.103611876
P99	256.16463107ms
P95	228.80363999999994ms
P50	107.5649885ms
Number of Invalid txs	0

Baseline Scenario

This scenario represents a minimal case and as such is a good baseline against which to assess the overhead introduced by more complex setups. There is a single hydra-node d with a single client submitting single input and single output transactions with a constant UTxO set of 1.

Number of nodes	1
Number of txs	300
Avg. Confirmation Time (ms)	3.959913890
P99	12.460638239999978ms
P95	9.039291ms
P50	2.8134285ms
Number of Invalid txs	0

[v0d1ch]

We would overwrite these hydra-node versions upon each release. I guess you needed to use the latest on master for the demo and also it should be ok to keep it as is here since 0.12 will update it.

[abailly-iohk]

Correct

[v0d1ch]

BAM!

[ch1bo]

Was already a great PR. Improved the help messages myself a bit and definitely can approve this.

[ch1bo]

Could run the executable against the demo setup, but obviously MessageDropped :)

[ch1bo]

Merging this in spite of https://github.com/input-output-hk/hydra/actions/runs/5788084058/job/15686670468#step:4:131 as this is unrelated.