Light Mode: currentCardanoEra

[Unisay]

• I have tested Epoch/Era translation in REPL manually.
• wrote unit test for the Epoch/Era translation.

Comments

Blockfrost API doesn't expose current Era so its implemented as a translation from current epoch number using a hardcoded table.

┌───────┬───────┬─────────┐
│ Epoch │ Major │   Era   │
├───────┼───────┼─────────┤
│  ...  │   6   │ Alonzo  │
│  298  │   6   │ Alonzo  │
├───────┼───────┼─────────┤
│  297  │   5   │ Alonzo  │
│  ...  │   5   │ Alonzo  │
│  290  │   5   │ Alonzo  │
├───────┼───────┼─────────┤
│  289  │   4   │  Mary   │
│  ...  │   4   │  Mary   │
│  251  │   4   │  Mary   │
├───────┼───────┼─────────┤
│  250  │   3   │ Allegra │
│  ...  │   3   │ Allegra │
│  236  │   3   │ Allegra │
├───────┼───────┼─────────┤
│  235  │   2   │ Shelley │
│  ...  │   2   │ Shelley │
│  202  │   2   │ Shelley │
├───────┼───────┼─────────┤
│  201  │   1   │  Byron  │
│  ...  │   1   │  Byron  │
└───────┴───────┴─────────┘

When new era type is added its expected that compiler emits a warning about non-exhaustive pattern match, thus forcing developer to update translation table with the corresponding epoch number;

Issue Number

ADP-1504

[Unisay]

bors try

[iohk-bors]

try

Build succeeded:

• buildkite/cardano-wallet
• ci/hydra-build:required

[HeinrichApfelmus]

Looks good to me! 😊 Again, I prefer the simply typed Either.

[HeinrichApfelmus]

Oh, and I only remembered now: Maybe make it clear in the name that these are mainnet eras? E.g. eraMainnetByEpoch

Or even add a NetworkDiscriminant argument:

eraByEpoch :: NetworkDiscriminant -> EpochNo -> Either BlockfrostError AnyCardanoEra

Our main reason for supporting testnet is so that Piotr can use it for QA.

[Unisay]

bors r+

[iohk-bors]

Build succeeded:

• buildkite/cardano-wallet
• ci/hydra-build:required

[piotr-iohk]

That's not what the wallet on mainnet shows for shelley...

$ curl -X GET https://localhost:32787/v2/network/parameters | jq .eras
{
  "mary": {
    "epoch_start_time": "2021-03-01T21:44:51Z",
    "epoch_number": 251
  },
  "byron": {
    "epoch_start_time": "2017-09-23T21:44:51Z",
    "epoch_number": 0
  },
  "allegra": {
    "epoch_start_time": "2020-12-16T21:44:51Z",
    "epoch_number": 236
  },
  "alonzo": {
    "epoch_start_time": "2021-09-12T21:44:51Z",
    "epoch_number": 290
  },
  "shelley": {
    "epoch_start_time": "2020-07-29T21:44:51Z",
    "epoch_number": 208
  }
}

[Unisay]

Fixed here 0bf442d