feat: add drpc to list of rpc cheat codes (#706)

src/providers/alchemy.ts

@@ -3,7 +3,7 @@ import { RPCTransport } from "./types";
 
 const MAINNET_CHAIN_IDs = Object.values(_MAINNET_CHAIN_IDs);
 
-// Chain-specific overrides for when the Alchemy endpoint does not match the canonical chain name.
+// Chain-specific overrides for when the endpoint name does not match the canonical chain name.
 const endpoints: { [chainId: string]: string } = {
   [CHAIN_IDs.ARBITRUM]: "arb",
   [CHAIN_IDs.ARBITRUM_SEPOLIA]: "arb-sepolia",
@@ -14,15 +14,15 @@ const endpoints: { [chainId: string]: string } = {
 };
 
 export function getURL(chainId: number, apiKey: string, transport: RPCTransport): string {
-  let host = endpoints[chainId] ?? PUBLIC_NETWORKS[chainId]?.name;
-  if (!host) {
+  let chain = endpoints[chainId] ?? PUBLIC_NETWORKS[chainId]?.name;
+  if (!chain) {
     throw new Error(`No known Alchemy provider for chainId ${chainId}`);
   }
 
   if (MAINNET_CHAIN_IDs.includes(chainId)) {
-    host = `${host}-mainnet`;
+    chain = `${chain}-mainnet`;
   }
-  host = host.toLowerCase().replace(" ", "-");
+  chain = chain.toLowerCase().replace(" ", "-");
 
-  return `${transport}://${host}.g.alchemy.com/v2/${apiKey}`;
+  return `${transport}://${chain}.g.alchemy.com/v2/${apiKey}`;
 }

src/providers/drpc.ts

@@ -0,0 +1,19 @@
+import { CHAIN_IDs, PUBLIC_NETWORKS } from "../constants";
+import { RPCTransport } from "./types";
+
+// Chain-specific overrides for when the endpoint name does not match the canonical chain name.
+const endpoints: { [chainId: string]: string } = {
+  [CHAIN_IDs.ARBITRUM]: "arbitrum",
+  [CHAIN_IDs.MAINNET]: "ethereum",
+};
+
+export function getURL(chainId: number, apiKey: string, transport: RPCTransport): string {
+  let chain = endpoints[chainId] ?? PUBLIC_NETWORKS[chainId]?.name;
+  if (!chain) {
+    throw new Error(`No known DRPC provider for chainId ${chainId}`);
+  }
+  chain = chain.toLowerCase().replace(" ", "-");
+  const rpcType = transport === "https" ? "rpc" : "ws";
+
+  return `${transport}://lb.drpc.org/og${rpcType}?network=${chain}&dkey=${apiKey}`;
+}

src/providers/infura.ts

@@ -3,21 +3,21 @@ import { RPCTransport } from "./types";
 
 const MAINNET_CHAIN_IDs = Object.values(_MAINNET_CHAIN_IDs);
 
-// Chain-specific overrides for when the Infura endpoint does not match the canonical chain name.
+// Chain-specific overrides for when the endpoint name does not match the canonical chain name.
 const endpoints: { [chainId: string]: string } = {
   [CHAIN_IDs.ARBITRUM]: "arbitrum",
 };
 
 export function getURL(chainId: number, apiKey: string, transport: RPCTransport): string {
-  let host = endpoints[chainId] ?? PUBLIC_NETWORKS[chainId]?.name;
-  if (!host) {
+  let chain = endpoints[chainId] ?? PUBLIC_NETWORKS[chainId]?.name;
+  if (!chain) {
     throw new Error(`No known Infura provider for chainId ${chainId}`);
   }
 
   if (chainId !== CHAIN_IDs.MAINNET && MAINNET_CHAIN_IDs.includes(chainId)) {
-    host = `${host}-mainnet`;
+    chain = `${chain}-mainnet`;
   }
-  host = host.toLowerCase().replace(" ", "-");
+  chain = chain.toLowerCase().replace(" ", "-");
 
-  return transport === "https" ? `https://${host}.infura.io/v3/${apiKey}` : `wss://${host}.infura.io/ws/v3/${apiKey}`;
+  return transport === "https" ? `https://${chain}.infura.io/v3/${apiKey}` : `wss://${chain}.infura.io/ws/v3/${apiKey}`;
 }

src/providers/types.ts

@@ -1,2 +1,2 @@
-export type RPCProvider = "INFURA" | "ALCHEMY";
+export type RPCProvider = "ALCHEMY" | "DRPC" | "INFURA" | "INFURA_DIN";
 export type RPCTransport = "https" | "wss";

src/providers/utils.ts

@@ -6,6 +6,7 @@ import { isDefined } from "../utils";
 import { RPCProvider, RPCTransport } from "./types";
 import * as alchemy from "./alchemy";
 import * as infura from "./infura";
+import * as drpc from "./drpc";
 
 /**
  * Infura DIN is identified separately to allow it to be configured explicitly.
@@ -14,6 +15,7 @@ const PROVIDERS = {
   ALCHEMY: alchemy.getURL,
   INFURA: infura.getURL,
   INFURA_DIN: infura.getURL,
+  DRPC: drpc.getURL,
 };
 
 /**
@@ -22,7 +24,7 @@ const PROVIDERS = {
  * @returns True if the provider string is a supported provider.
  */
 export function isSupportedProvider(provider: string): provider is RPCProvider {
-  return ["ALCHEMY", "INFURA", "INFURA_DIN"].includes(provider);
+  return ["ALCHEMY", "INFURA", "INFURA_DIN", "DRPC"].includes(provider);
 }
 
 /**