Improve hydra-node command line gen-hydra-key error handling

[pgrange]

hydra-node gen-hydra-key --output-file credentials/alice-hydra will silently fail if credentials directory does not exist. This PR introduces an error message output and an error code so that user or scripts can figure out that the command failed.

---

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

[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	2023-09-19 19:21:48.794969055 UTC
Max. memory units	14000000
Max. CPU units	10000000000
Max. tx size (kB)	16384

Script summary

Name	Hash	Size (Bytes)
νInitial	3ffaf6b87df35cb01a52eb23032b8f0b1a2a3ad3acf0930abc9c833a	4150
νCommit	e4c32d6dc83b2917aa7805571f30437ad98b6d20d821d34d45943755	2093
νHead	8a43c1c4d5cb60c212e7aa540932f311cb914a1b6104f0f36a2aaaf0	8845
μHead	efd460b736e8155861e909d6507760b24a5c28717591c6e98c26b104*	4187

• 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	4781	11.77	4.63	0.49
2	4985	14.54	5.70	0.53
3	5191	16.74	6.53	0.56
5	5601	21.48	8.33	0.63
10	6625	33.37	12.86	0.80
37	12160	97.15	37.10	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	12.67	4.97	0.31
2	787	16.49	6.69	0.37
3	975	20.37	8.42	0.42
5	1345	28.46	12.01	0.53
10	2273	51.44	21.99	0.82
18	3779	95.35	40.55	1.38

Cost of CollectCom Transaction

Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	57	815	24.07	9.57	0.45
2	113	1134	36.89	14.81	0.60
3	169	1453	54.57	21.96	0.81
4	225	1773	68.53	27.90	0.98
5	284	2097	92.61	37.66	1.26

Cost of Close Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	623	17.15	7.39	0.37
2	917	20.70	10.32	0.43
3	1145	22.51	11.92	0.47
5	1236	23.33	10.81	0.47
10	2585	34.66	22.76	0.71
50	10632	99.95	82.26	2.02

Cost of Contest Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	723	23.22	10.34	0.44
2	941	25.18	12.00	0.48
3	1144	27.09	13.63	0.52
5	1620	30.50	16.78	0.59
10	2668	40.82	25.24	0.78
43	9330	97.89	75.20	1.89

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	5012	21.67	9.31	0.61
2	5192	31.50	13.44	0.73
3	5967	54.43	23.84	1.02
4	6468	75.89	33.33	1.29
5	6281	85.94	37.29	1.39

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	4803	9.06	3.81	0.46
5	1	57	4836	10.21	4.54	0.48
5	5	284	4982	14.84	7.48	0.54
5	10	570	5165	22.18	11.79	0.64
5	20	1140	5528	35.30	19.78	0.82
5	30	1707	5882	48.43	27.77	1.00
5	40	2275	6237	61.57	35.77	1.18
5	50	2848	6608	74.28	43.60	1.36
5	69	3927	7289	99.69	58.99	1.70

[github-actions]

Test Results

346 tests   - 12   341 ✔️  - 12   21m 49s ⏱️ - 5m 2s
118 suites  -   3       5 💤 ±  0 
    5 files    -   1       0 ❌ ±  0 

Results for commit e3a692a. ± Comparison against base commit b9864ac.

This pull request removes 13 and adds 1 tests. Note that renamed tests count towards both.

Hydra.TUI.Options ‑ no arguments yield default options
Hydra.TUI.Options ‑ parses --cardano-signing-key option
Hydra.TUI.Options ‑ parses --connect option
Hydra.TUI.Options ‑ parses --node-socket option
Hydra.TUI.Options ‑ parses --testnet-magic option
Hydra.TUI.Options ‑ parses --version option
Hydra.TUI/end-to-end smoke tests ‑ display feedback long enough
Hydra.TUI/end-to-end smoke tests ‑ doesn't allow multiple initializations
Hydra.TUI/end-to-end smoke tests ‑ starts & renders
Hydra.TUI/end-to-end smoke tests ‑ supports the full Head life cycle
…

Hydra.Utils ‑ Should throw if it can't write on disk

♻️ This comment has been updated with latest results.

[locallycompact]

+1