From d836e7c26fcf4fc8b22a81299e3059f248faa258 Mon Sep 17 00:00:00 2001
From: NunoSempere <nuno.sempere@gmail.com>
Date: Tue, 31 Aug 2021 21:14:55 +0200
Subject: [PATCH] feat: Added the correct urls to Kalshi markets.

---
 src/platforms/kalshi-fetch.js | 79 +++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 src/platforms/kalshi-fetch.js

diff --git a/src/platforms/kalshi-fetch.js b/src/platforms/kalshi-fetch.js
new file mode 100644
index 0000000..3784234
--- /dev/null
+++ b/src/platforms/kalshi-fetch.js
@@ -0,0 +1,79 @@
+/* Imports */
+import fs from 'fs'
+import axios from "axios"
+import { calculateStars } from "../utils/stars.js"
+import {upsert} from "../utils/mongo-wrapper.js"
+
+/* Definitions */
+let jsonEndpoint = "https://trading-api.kalshi.com/v1/cached/markets/"//"https://subgraph-matic.poly.market/subgraphs/name/TokenUnion/polymarket"//"https://subgraph-backup.poly.market/subgraphs/name/TokenUnion/polymarket"//'https://subgraph-matic.poly.market/subgraphs/name/TokenUnion/polymarket3'
+
+/* Support functions
+async function fetchAllContractInfo(){ // for info which the polymarket graphql API
+  let data = fs.readFileSync("./data/polymarket-contract-list.json")
+  let response = JSON.parse(data)
+  return response
+}
+ */
+async function fetchAllMarkets() { // for info which the polymarket graphql API
+  let response = await axios.get(jsonEndpoint).then(response => response.data.markets)
+  // console.log(response)
+  return response
+}
+
+
+async function processMarkets(markets) {
+  let dateNow = new Date().toISOString()
+  // console.log(markets)
+  markets = markets.filter(market => market.close_date > dateNow)
+  let results = await markets.map(market => {
+    let probability = market.last_price/100
+    let options = [
+      {
+        "name": "Yes",
+        "probability": probability,
+        "type": "PROBABILITY"
+      },
+      {
+        "name": "No",
+        "probability": 1 - probability,
+        "type": "PROBABILITY"
+      }
+    ]
+    let result = ({
+      "title": market.title,
+      "url": `https://kalshi.com/markets/${market.ticker_name}`,
+      "platform": "Kalshi",
+      "description": `${market.settle_details}. The resolution source is: ${market.ranged_group_name} (${market.settle_source_url})`,
+      "options": options,
+      "timestamp": new Date().toISOString(),
+      "qualityindicators": {
+          "stars": calculateStars("Kalshi", ({volume: market.volume, interest: market.open_interest})),
+          "yes_bid": market.yes_bid,
+          "yes_ask": market.yes_ask,
+          "spread": Math.abs(market.yes_bid-market.yes_ask),
+          "volume": market.volume,
+          "open_interest": market.open_interest
+      }
+    })
+    return result
+  })
+  //console.log(results.length)
+  // console.log(results.map(result => result.title))
+  // console.log(results.map(result => result.title).length)
+  console.log([...new Set(results.map(result => result.title))])
+  console.log("Number of unique questions: ", [...new Set(results.map(result => result.title))].length)
+  // console.log([...new Set(results.map(result => result.title))].length)
+  return results //resultsProcessed
+}
+
+/* Body */
+export async function kalshi() {
+  let markets = await fetchAllMarkets()
+  let results = await processMarkets(markets) // somehow needed
+  // console.log(results)
+  // let string = JSON.stringify(results, null, 2)
+  // fs.writeFileSync('polymarket-questions.json', string);
+  await upsert(results, "kalshi-questions")
+  console.log("Done")
+}
+// kalshi()