FR: Remove dependency on tzscan about tezos-reward-distributor HOT 17 CLOSED

Your concerns are valid. However, use RPC API requires a lot of programming/testing effort. I need to see more demand before adding RPC based reward calculations.

I will leave this issue open to see if there will be more demand.

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Found it. Credit to @DefinitelyNotAGoat golang tezos library.

The pattern:

• get level for cycle X (cycle X * 4096 + 1)
• get block for level (/chains/main/blocks/" + headHash + "~" + (current level - level))
• get roll snapshot index for block (/chains/main/blocks/" + block.Hash + "/context/raw/json/cycle/" + strCycle)
• get snapshot block for payment cycle X (((cycleX - 7) * 4096) + (RollSnapShot+1)*256)
• get staking balance of delegate using snapshot block (/chains/main/blocks/" + snapshot block
  hash + "/context/delegates/" + delegatePhk + "/staking_balance)
• get delegates at cycle X (/chains/main/blocks/" + snapshot block hash + "/context/delegates/" + delegatePhk + "/delegated_contracts
• get rewards for delegate at cycle X (/chains/main/blocks/head/context/raw/json/contracts/index/" + delegatePhk + "/frozen_balance/" + X
• foreach delegates, get delegate balance at snapshot (/chains/main/blocks/" + snapshot block hash + "/context/contracts/" + delegate KT1 + "/balance"
  -- calculate % of total staking per delegatee
  -- calculate reward for delegatee

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Nope. I asked lead dev and Aurthor in bakers-slack. Waiting for response.

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+1

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What needs to be fetched from RPC?

• List of delegators
• list of 'active' delegators
• Balance of each delegator
• Staking balance of baker
• total balance of baker

The hardest thing I cannot find is for which cycle a delegator activates.

# Alphanet
$ ./tezos-client rpc get /chains/main/blocks/head/context/delegates/tz1LdZ6S8ScNMgaCLqrekDvbBWhLqtUebk23
{ "balance": "13594924319", "frozen_balance": "0",
  "frozen_balance_by_cycle": [], "staking_balance": "32345701585",
  "delegated_contracts":
    [ "KT1WyMWHxGt8HLgWG9LZEqxG5u2kEpHNyE8D",
      "KT1Ua68oUfTwykAC8MRh8JZm9Ekd8wp57rm9",
      "KT1MTZGjAZo9ZYNU2y72vxwpg3iqGUWpZyfm",
      "KT1Lg9R2b2UjJhJdhvRnNovdpaQF41o2jvgw" ],
  "delegated_balance": "18750777266", "deactivated": false,
  "grace_period": 7 }

You can see a list of all delegates but no info on their staked balance, nor any indication to which cycle their delegation amount unfreezes and becomes part of the staked balance. This is typically 7 cycles, but I was expecting there to be an RPC call to find out which specific block/level.

The staking balance noted above is incorrect. Each of those delegates were added in cycle 1 (alphanet reset on Nov 30th) and should not be considered part of the staked balance for 7 cycles.

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This RPC validates the KT1 is a delegate of our baker, tz1LdZ, and gives us the staked balance.

./tezos-client rpc get /chains/main/blocks/head/context/contracts/KT1XfTzTJWFMsEukKXXVoKbwsBFbZvYS3hkn
{ "manager": "tz1Sfe7Nm2MdmkCopA7DVBUHHEd8G73TWwfN",
  "balance": "14378132380", "spendable": true,
  "delegate":
    { "setable": false, "value": "tz1LdZ6S8ScNMgaCLqrekDvbBWhLqtUebk23" },
  "counter": "0" }

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/chains/main/blocks/head/context/delegates/
balance + delegated_balance - rewars = staking_balance.

For a specific cycle/block we will need to use blockhash instead of 'head'. In order to get that we will need to find snapshot chosen for the cycle.

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Been looking for snapshot information in RPC. Not documented fully.

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Yeah, documentation is not great.

/chains/main/blocks/head/context/raw/json/rolls/owner/snapshot/

returns selected snapshot index <sn_idx> for

block index for which snapshot taken can be calculated. Remember in each block there are 16 snapshot thus 256 blocks between snapshots. Eventually:

block_index = sn_idx*256 + * 4096 (roughly)

This block_index can be converted to block_hash. Once we have block hash we can query delegators/stake state for the specific block.

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So this gives me snapshots I can access:

$ ./tezos-client rpc get /chains/main/blocks/head/context/raw/json/rolls/owner/snapshot
[ 7, 6, 5, 4, 3, 2, 1, 0 ]

Then I can query a specific (the current) cycle:

$ ./tezos-client rpc get /chains/main/blocks/head | jq -r '.metadata.level.cycle'
2
$ ./tezos-client rpc get /chains/main/blocks/head/context/raw/json/rolls/owner/snapshot/2/
[ 0 ]

What does that 0 mean here?
If I look at mainnet, current cycle 51:

https://rpc.tezrpc.me/chains/main/blocks/head/context/raw/json/rolls/owner/snapshot/51/
"[1]"

Fetching that:

$ ./tezos-client rpc get /chains/main/blocks/head/context/raw/json/rolls/owner/snapshot/2/0/
[ 2403, 2147, 1891, 1635, 1379, 1123, 867, 611, 2659, 355, 99, 2402, 2146,
  1890, 1634, 1378, 1122, 866, 610, 2658, 354, 98, 2401, 2145, 1889, 1633,
...

Fetching one of these:

$ ./tezos-client rpc get /chains/main/blocks/head/context/raw/json/rolls/owner/snapshot/2/0/596/
"p2pk66EmFoQS6b2mYLvCrwjXs7XT1A2znX26HcT9YMiGsyCHyDvsLaF"

And that is?

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How long does

./tezos-client rpc get /chains/main/blocks/head/context/raw/json/rolls/owner/snapshot/2/

take on your mainnet node?

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https://rpc.tezrpc.me/chains/main/blocks/head/context/raw/json/rolls/owner/snapshot/55/
Takes about 10 seconds

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The block-snapshot calculation is different on alphanet (-1) vs mainnet (-2)

PRESERVED_CYCLES=3
BLOCKS_IN_CYCLE=2048
(cycle - PRESERVED_CYCLES - 1) * BLOCKS_IN_CYCLE) + (snapShotQuery.RollSnapShot + 1) * 256

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Any idea why it is different? Reserved cycles parameter is already different in alpha and mainnet e.g. 2 vs 5.

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+1 add dependance on the node

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@amzid implemented this feature.

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Work of @amzid is merged. Now RPC based calculations are supported.

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