feat(qf-funding-score): to calculate score for each project from past…

… donations

for thematters/developer-resource#350 & #103

bin/qf-calculate.ts

@@ -0,0 +1,16 @@
+#!/usr/bin/env -S node --trace-warnings --loader ts-node/esm
+
+import { calculateQFScore } from "../lib/qf-calculate.js";
+
+async function main() {
+  const args = process.argv.slice(2);
+  const amount = BigInt(+(args?.[0] || 500) * 1e6);
+
+  await calculateQFScore({
+    fromTime: "2023-12-31",
+    toTime: "2024-12-31T23:59:59.999Z",
+    amount,
+  });
+}
+
+main().catch((err) => console.error(new Date(), "ERROR:", err));

handlers/qf-calculate.ts

@@ -0,0 +1,52 @@
+import { Context, APIGatewayProxyResult, APIGatewayEvent } from "aws-lambda";
+import { calculateQFScore } from "../lib/qf-calculate.js";
+
+export const handler = async (
+  event: APIGatewayEvent & {
+    fromTime?: string;
+    toTime?: string;
+    amount?: string;
+    forceRun?: boolean;
+  },
+  context: Context
+): Promise<APIGatewayProxyResult> => {
+  console.log(`Event: ${JSON.stringify(event, null, 2)}`);
+  console.log(`Context: ${JSON.stringify(context, null, 2)}`);
+
+  const { method, path } = ((event?.requestContext as any)?.http as any) || {};
+  const forceRun = !!("forceRun" in (event?.queryStringParameters as any));
+  const { accept, origin }: { accept?: string; origin?: string } =
+    event?.headers || {};
+  if (
+    !(
+      event?.forceRun ||
+      (path === "/qf-calculator" && accept?.includes("application/json"))
+    )
+  ) {
+    return {
+      statusCode: 400,
+      body: JSON.stringify({
+        error:
+          "input error, call with POST /qf-calculator with accept: application/json",
+      }),
+    };
+  }
+
+  const { fromTime, toTime, amount } = event?.forceRun
+    ? event
+    : event?.queryStringParameters || {};
+
+  const { root, tree } = await calculateQFScore({
+    fromTime,
+    toTime,
+    amount: BigInt(+(amount || 500) * 1e6),
+  });
+
+  return {
+    statusCode: 200,
+    body: JSON.stringify({
+      message: "done.",
+      root, // tree
+    }),
+  };
+};

lib/bigint-math.ts

@@ -0,0 +1,77 @@
+// https://golb.hplar.ch/2018/09/javascript-bigint.html
+export class BigIntMath {
+  static max(...values: Array<bigint | number>) {
+    if (values.length === 0) {
+      return null;
+    }
+
+    if (values.length === 1) {
+      return values[0];
+    }
+
+    let max = values[0];
+    for (let i = 1; i < values.length; i++) {
+      if (values[i] > max) {
+        max = values[i];
+      }
+    }
+    return max;
+  }
+
+  static min(...values: Array<bigint | number>) {
+    if (values.length === 0) {
+      return null;
+    }
+
+    if (values.length === 1) {
+      return values[0];
+    }
+
+    let min = values[0];
+    for (let i = 1; i < values.length; i++) {
+      if (values[i] < min) {
+        min = values[i];
+      }
+    }
+    return min;
+  }
+
+  static sign(value: bigint | number) {
+    if (value > 0n) {
+      return 1n;
+    }
+    if (value < 0n) {
+      return -1n;
+    }
+    return 0n;
+  }
+
+  static abs(value: bigint | number) {
+    if (this.sign(value) === -1n) {
+      return -value;
+    }
+    return value;
+  }
+
+  // https://stackoverflow.com/questions/53683995/javascript-big-integer-square-root/58863398#58863398
+  static rootNth(value: bigint, k: bigint = 2n) {
+    if (value < 0n) {
+      throw "negative number is not supported";
+    }
+
+    let o = 0n;
+    let x = value;
+    let limit = 100;
+
+    while (x ** k !== k && x !== o && --limit) {
+      o = x;
+      x = ((k - 1n) * x + value / x ** (k - 1n)) / k;
+    }
+
+    return x;
+  }
+
+  static sqrt(value: bigint) {
+    return BigIntMath.rootNth(value);
+  }
+}

lib/polygonscan.ts

@@ -0,0 +1,30 @@
+const PolygonScanAPIKEY = process.env.MATTERS_POLYGONSCANAPIKEY || "";
+// https://api.polygonscan.com/api?module=block&action=getblocknobytime&timestamp=1704184772&closest=before&apikey={key}
+
+export class PolygonScanAPI {
+  static async getBlockFromTimestamp({
+    timestamp,
+    closest,
+  }: {
+    timestamp: number; // Date | string | number;
+    closest: "before" | "after";
+  }) {
+    const nowTs = Math.floor(+Date.now() / 1e3);
+    const params = new URLSearchParams({
+      module: "block",
+      action: "getblocknobytime",
+      timestamp: Math.min(nowTs, timestamp).toString(),
+      closest: timestamp >= nowTs ? "before" : closest, // override to before if pass now or future timestamp
+      apikey: PolygonScanAPIKEY,
+    });
+    const u = new URL(`https://api.polygonscan.com/api?${params}`);
+    console.log(new Date(), `get with:`, { params, u });
+    const res = await fetch(u).then((res) => res.json());
+
+    // {"status":"1","message":"OK","result":"51846093"}
+    if (!(res?.status === "1" && res?.message === "OK"))
+      console.error(new Date(), `non-ok result:`, res);
+
+    return BigInt(res?.result);
+  }
+}