initial database migration, watcher.js

blockchain.js

@@ -3,7 +3,7 @@ import {ethers} from "ethers";
 const providers = {} // indexed by chain id
 
 
-export function provider(chainId) {
+export function getProvider(chainId) {
     let result = providers[chainId]
     if( result === undefined ) {
         const rpc_url = process.env['DEXORDER_RPC_URL_'+chainId]
@@ -19,3 +19,24 @@ export function provider(chainId) {
     return result
 }
 
+const signers = {} // indexed by chain id, value is an array to be used in round-robin fashion
+const signerIndexes = {}
+
+
+export function signer(chainId) {
+    let chainSigners = signers[chainId]
+    if (chainSigners === undefined) {
+        chainSigners = []
+        const private_keys = process.env['DEXORDER_ACCOUNTS_' + chainId]
+        for (const match of private_keys.matchAll(/([^,]+),?/g))
+            chainSigners.push(new ethers.Wallet(match[1]))
+        signers[chainId] = chainSigners
+        signerIndexes[chainId] = 0
+    }
+    const result = chainSigners[signerIndexes[chainId]]
+    signerIndexes[chainId]++
+    if( signerIndexes[chainId] >= chainSigners.length )
+        signerIndexes[chainId] = 0
+    return result
+}
+