Hydra node crashed after a fork

[v0d1ch]

fix #560

Incorporate @ch1bo 's comments and query the cardano-node tip directly. Hopefully this prevents node crashing on rollbacks.

---

• CHANGELOG updated
• Documentation updated
• Added and/or updated haddocks
• No new TODOs introduced or explained herafter

[github-actions]

Test Results

308 tests  +11   302 ✔️ +11   21m 3s ⏱️ -5s
104 suites +  4       6 💤 ±  0 
    6 files   +  1       0 ❌ ±  0 

Results for commit 2427c65. ± Comparison against base commit 79c5133.

[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	2023-03-28 12:08:20.414277618 UTC
Max. memory units	14000000
Max. CPU units	10000000000
Max. tx size (kB)	16384

Script summary

Name	Hash	Size (Bytes)
νInitial	9492414f8f96e8483a0b8ee268fc06a954641cb2cbaa9a8b093c2c9b	4621
νCommit	5d3f107aaa56d06188cf231941cf8163e777236a9cfdc48fd4bbfa23	2422
νHead	82f16b51e2d81c6f4d42dd7398b4713a445464902f63dfd86ffe754e	8954
μHead	4083fa7081a0f4b4092fb02867c9ac594bb0e8bab8110ab242ba5a72*	4458

• 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	5054	13.12	5.16	0.52
2	5257	15.22	5.95	0.55
3	5464	20.31	7.97	0.61
5	5874	24.20	9.40	0.67
10	6900	35.99	13.85	0.84
36	12232	97.37	37.01	1.74

Cost of Commit Transaction

Currently only one UTxO per commit allowed (this is about to change soon)

UTxO	Tx size	% max Mem	% max CPU	Min fee ₳
1	603	15.75	6.19	0.35

Cost of CollectCom Transaction

Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	57	816	24.50	9.95	0.46
2	113	1137	40.66	16.63	0.65
3	169	1460	58.95	24.26	0.87
4	227	1785	80.63	33.31	1.12

Cost of Close Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	668	17.48	7.67	0.38
2	800	18.69	8.19	0.40
3	969	20.08	8.96	0.42
5	1300	22.57	10.38	0.46
10	2120	29.58	14.25	0.59
50	8733	86.05	45.32	1.56

Cost of Contest Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	675	21.73	9.11	0.42
2	848	23.45	9.99	0.45
3	1006	25.21	10.89	0.48
5	1335	28.63	12.66	0.53
10	2160	37.72	17.28	0.67
46	8095	99.62	49.15	1.67

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	5170	29.49	12.60	0.71
2	5491	48.00	20.73	0.93
3	5816	69.95	30.41	1.19
4	6136	95.72	41.76	1.49

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	5078	10.59	4.43	0.49
5	1	57	5113	12.12	5.31	0.51
5	5	285	5257	18.22	8.83	0.59
5	10	570	5437	25.85	13.24	0.69
5	20	1140	5793	41.11	22.05	0.90
5	30	1704	6157	56.37	30.86	1.10
5	40	2278	6519	71.64	39.68	1.30
5	50	2845	6875	86.92	48.50	1.50
5	58	3302	7164	99.14	55.56	1.67

[ch1bo]

@v0d1ch Please don't ignore the PR checklist. I think a changelog update for this would have been good? Also there is the "known issue" in the docs which might not be relevant anymore. Adding a note there but keeping it would be a good step here.

[v0d1ch]

The known-issues are updated in the #795 and for the changelog I wasn't sure if I need to add anything since we are not 100% sure this fix works.