Add endpoint for the Snapshot strategy

packages/backend/api/[context]/snapshot/[blocknumber]/strategy-formatted-vote-weights.ts

@@ -0,0 +1,57 @@
+// given a list of addresses, fetch the vote weight for each address from the snapshot in the database
+// will be used by the strategy to calculate the score
+
+import type { VercelRequest, VercelResponse } from "@vercel/node"
+import { createDelegationSnapshot } from "../../../../lib/updateSnapshot"
+import {
+  checkIfSnapshotExists,
+  getDelegationSnapshot,
+  getVoteWeightSnapshot,
+} from "../../../../lib/services/storage/db"
+import * as R from "ramda"
+import { BigNumber } from "ethers"
+
+export default async function getVoteWeightsForSnapshot(
+  request: VercelRequest,
+  response: VercelResponse,
+) {
+  const context = request.query.context as string
+  const mainChainBlockNumber: number | null =
+    request.query.blocknumber === "latest"
+      ? null
+      : Number(request.query.blocknumber)
+
+  const addresses = request.body.addresses as string[]
+
+  console.log({
+    context,
+    mainChainBlockNumber,
+    addresses,
+  })
+
+  if (mainChainBlockNumber != null) {
+    if (!(await checkIfSnapshotExists(context, mainChainBlockNumber))) {
+      await createDelegationSnapshot(context, mainChainBlockNumber)
+    }
+  }
+
+  const voteWeights = await getVoteWeightSnapshot(context, mainChainBlockNumber)
+  console.log({ voteWeights })
+
+  const relevantVoteWeights = R.innerJoin(
+    (record, address) => record.to_address === address,
+    voteWeights,
+    addresses,
+  )
+
+  response
+    .status(200)
+    .json(
+      relevantVoteWeights.map((record) => [
+        record.to_address,
+        BigNumber.from(record.delegated_amount)
+          .add(BigNumber.from(record.to_address_own_amount))
+          .toString(),
+      ]),
+    )
+}

packages/backend/api/[context]/snapshot/[blocknumber]/voteWeights.ts → packages/backend/api/[context]/snapshot/[blocknumber]/vote-weights.ts

@@ -1,5 +1,4 @@
 // given a list of addresses, fetch the vote weight for each address from the snapshot in the database
-// will be used by the strategy to calculate the score
 
 import type { VercelRequest, VercelResponse } from "@vercel/node"
 import { createDelegationSnapshot } from "../../../../lib/updateSnapshot"

packages/backend/example-requests/delegates-scores.http

@@ -1,13 +1,14 @@
 // Get the voting power delegated to each delegate (provided in the request body).
 // Returned in the format required by the "API POST strategy" (https://github.com/snapshot-labs/snapshot-strategies/tree/master/src/strategies/api-post)
 
-POST http://localhost:3000/api/delegates/scores?space=gnosis.eth
+POST http://localhost:3000/api/mydao.eth/snapshot/8979656/strategy-formatted-vote-weights
 content-type: application/json
 
 {
     "addresses": [
 			"0x6cc5b30Cd0A93C1F85C7868f5F2620AB8c458190",
   		"0x7ef021f62E3E7975FBC21d3202C5A1F19D53bB47",
-  		"0x1E1A51E25f2816335cA436D65e9Af7694BE232ad"
+  		"0x1E1A51E25f2816335cA436D65e9Af7694BE232ad",
+			"0xD028d504316FEc029CFa36bdc3A8f053F6E5a6e4"
 		]
 }

packages/backend/example-requests/snapshot-context.http

@@ -1,6 +1,6 @@
 // Recomputes the vote weights for all delegates across all Snapshot Spaces.
 
-GET http://localhost:3000/api/gnosis.eth/snapshot/8979656/create
+GET http://localhost:3000/api/mydao.eth/snapshot/8979656/create
 
 // 8500949 - has one delegation set on goerli in gnosis.eth
 // 8979655 - has more