Adding pricing functions

Author: andreespirela

README.md

@@ -548,6 +548,40 @@ fetchPaginated<PaginatedToken>("tokens").then(async (result) => {
 });
 ```
 
+### Fetching price history
+**Signature**
+`fetchPriceHistory = async (pair: [string, string], desc?: boolean): Promise<Array<VwapModel>>`
+
+**Usage**
+
+```typescript
+import { fetchPriceHistory } from "verto-cache-interface"
+
+fetchPriceHistory(["A", "B"]).then((result) => {
+    result.forEach((vwap) => {
+        console.log(vwap.block);
+        console.log(vwap.vwap);
+        console.log(vwap.dominantToken);
+    });
+})
+```
+
+### Fetching latest price
+**Signature**
+`fetchLatestPrice = async (pair: [string, string]): Promise<VwapModel | undefined>`
+
+**Usage**
+
+```typescript
+import { fetchLatestPrice } from "verto-cache-interface"
+
+fetchLatestPrice(["A", "B"]).then((result) => {
+    console.log(vwap.block);
+    console.log(vwap.vwap);
+    console.log(vwap.dominantToken);
+})
+```
+
 ## Hooks
 
 Hooks are a way to invoke functions and then invoke certain behaviors inside the cache system.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "verto-cache-interface",
-  "version": "1.2.4",
+  "version": "1.2.5",
   "description": "A communication package with Verto Cache System",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

src/calls/fetch-latest-price.ts

@@ -0,0 +1,6 @@
+import {VwapModel} from "./types/vwap-model";
+import {cacheApiBaseRequest} from "./cache-api-base-request";
+
+export const fetchLatestPrice = async (pair: [string, string]): Promise<VwapModel | undefined> => {
+    return (await cacheApiBaseRequest<VwapModel>(`token/price/${pair.join(",")}`))?.data || undefined;
+}

src/calls/fetch-price-history.ts

@@ -0,0 +1,18 @@
+import axios from "axios";
+import {CommonUtils} from "../utils";
+import {VwapModel} from "./types/vwap-model";
+
+export const fetchPriceHistory = async (pair: [string, string], desc?: boolean): Promise<Array<VwapModel>> => {
+    try {
+        let vwaps: Array<VwapModel> | undefined = ((await axios.get(CommonUtils.buildVwapCdn(pair))).data) as any;
+        if((vwaps || []).length > 0) {
+            if(desc) {
+                vwaps = vwaps?.sort((a,b) => b.block - a.block);
+            }
+            return vwaps!;
+        }
+    } catch(e) {
+        console.error(e);
+    }
+    return [];
+}

src/calls/types/vwap-model.ts

@@ -0,0 +1,5 @@
+export interface VwapModel {
+    block: number;
+    vwap: number;
+    dominantToken: string;
+}

src/index.ts

@@ -30,5 +30,7 @@ export * from './calls/fetch-communities-metadata';
 export * from './calls/fetch-artwork-metadata';
 export * from './calls/fetch-token-by-id';
 export * from './calls/fetch-paginated';
+export * from './calls/fetch-price-history';
+export * from './calls/fetch-latest-price';
 export * from './hooks/cache-contract-hook';
 export * from './constants';

src/utils/common-utils.ts

@@ -9,4 +9,8 @@ export class CommonUtils {
     static buildValidityCdn(contractId: string): string {
         return `${CacheInterfaceConstants.CONTRACT_CDN}/${contractId}/${contractId}_validity.json`;
     }
+
+    static buildVwapCdn(pair: [string, string]): string {
+        return `${CacheInterfaceConstants.CONTRACT_CDN}/vwaps/${pair[0]}_${pair[1]}.json`;
+    }
 }