Add support for begin..commit group transactions

lib/pricecaster.js

@@ -1,4 +1,3 @@
-const { encodeAddress } = require('algosdk')
 const algosdk = require('algosdk')
 const fs = require('fs')
 // eslint-disable-next-line camelcase
@@ -16,6 +15,7 @@ class PricecasterLib {
     this.algodClient = algodClient
     this.ownerAddr = ownerAddr
     this.minFee = 1000
+    this.groupTx = []
 
     /** Overrides the default VAA processor approval program filename
      * @param {string} filename New file name to use.
@@ -496,14 +496,56 @@ class PricecasterLib {
       if (!algosdk.isValidAddress(sender)) {
         throw new Error('Invalid sender address: ' + sender)
       }
-      if (!algosdk.isValidAddress(hash)) {
-        throw new Error('Invalid program hash: ' + hash)
-      }
       const appArgs = []
       appArgs.push(new Uint8Array(Buffer.from('setvphash')),
         algosdk.decodeAddress(hash).publicKey)
       return await this.callApp(sender, appArgs, [], signCallback)
     }
+
+    /**
+     * Starts a begin...commit section for commiting grouped transactions.
+     */
+    this.beginVerifyTxGroup = async function () {
+      this.groupTx = []
+    }
+
+    /**
+     * @param {*} sender The sender account (typically the VAA verification stateless program)
+     * @param {function} signCallback The sign callback routine.
+     * @returns Transaction id.
+     */
+    this.commitVerifyTxGroup = async function (sender, signCallback) {
+      algosdk.assignGroupID(this.groupTx)
+
+      // Sign the transactions
+      const signedTxns = []
+      for (const tx of this.groupTx) {
+        signedTxns.push(signCallback(sender, tx))
+      }
+
+      // Submit the transaction
+      const tx = await this.algodClient.sendRawTransaction(signedTxns).do()
+      this.groupTx = []
+      return tx.txId
+    }
+
+    /**
+     * VAA Processor: Add a verification step to a transaction group.
+     * @param {*} sender The sender account (typically the VAA verification stateless program)
+     * @param {*} payload The VAA payload as Uint8Array.
+     * @param {*} gksubset An hex string containing the keys for the guardian subset in this step.
+     * @param {*} totalguardians The total number of known guardians.
+     */
+    this.addVerifyTx = async function (sender, payload, gksubset, totalguardians) {
+      const appArgs = []
+      appArgs.push(new Uint8Array(Buffer.from(gksubset, 'hex')), algosdk.encodeUint64(parseInt(totalguardians)))
+      this.groupTx.push(algosdk.makeApplicationNoOpTxn(sender,
+        appArgs,
+        this.appId,
+        undefined, undefined, undefined, undefined,
+        payload))
+      this.groupTx.push()
+    }
   }
 }