Examples for DD

Add New Tweet Example/index.js

@@ -0,0 +1,151 @@
+// React Format uncomment on React
+//import { Connection, clusterApiUrl } from "@solana/web3.js";
+//import { deserialize } from "borsh";
+//import bs58 from "bs58";
+
+// Comment this on react
+const {
+  Connection,
+  clusterApiUrl,
+  PublicKey,
+  Keypair,
+  Transaction,
+  TransactionInstruction,
+  SYSVAR_RENT_PUBKEY,
+  SystemProgram,
+  sendAndConfirmTransaction,
+} = require("@solana/web3.js");
+const { serialize } = require("borsh");
+const bs58 = require("bs58");
+
+// Constants and Variables
+
+const tweetSchema = {
+  struct: { content: "string", owner: "string", timestamp: "u32" },
+};
+
+const payloadSchema = {
+  struct: {
+    instruction: "u8",
+    bump: "u8",
+    seed: "string",
+    space: "u8",
+    content: "string",
+    owner: "string",
+    timestamp: "u32",
+  },
+};
+
+const ProgramInstruction = {
+  AddTweet: 0,
+  ModifyTweet: 1,
+};
+
+// program id
+const programId = new PublicKey("7GTHRrqPjABFdUPmdPAmiaqdhJ162cAg1mTXTY5z9Y7D");
+
+// connection
+const connection = new Connection(clusterApiUrl("devnet"));
+
+// Example Private Key, this account had 10 solana devnet for testing
+const feePayer = Keypair.fromSecretKey(
+  bs58.decode(
+    "4zspfaFA1MvNdRwmZLDDhMJfmB7r3DQ1Zfd3qNNLPgQPzjrZtCsbyPccuvJKyfdLiY8Rbay3QUKGET9GJnC7fGw1"
+  )
+);
+console.log(feePayer.publicKey.toString());
+
+// Utils
+
+function generateRandomString(n) {
+  const chars = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
+  let result = "";
+  for (let i = 0; i < n; i++) {
+    result += chars.charAt(Math.floor(Math.random() * chars.length));
+  }
+  return result;
+}
+
+function completeStringWithSymbol(inputString, symbol, desiredLength) {
+  const currentLength = inputString.length;
+  if (currentLength >= desiredLength) {
+    return inputString;
+  }
+  const remainingLength = desiredLength - currentLength;
+  const symbolsToAdd = symbol.repeat(remainingLength);
+  return inputString + symbolsToAdd;
+}
+
+// Main code
+
+async function main() {
+  const seed = generateRandomString(32);
+  let [pda, bump] = await PublicKey.findProgramAddressSync(
+    [Buffer.from(seed), feePayer.publicKey.toBuffer()],
+    programId
+  );
+
+  const instruction = ProgramInstruction.AddTweet;
+
+  const seedStruct = {
+    content: completeStringWithSymbol("Hello this is a tweet", "#", 128),
+    owner: feePayer.publicKey.toBase58(),
+    timestamp: Math.floor(Date.now() / 1000), // Timestamp in seconds, not in miliseconds (u32 limits)
+  };
+
+  const space = serialize(tweetSchema, seedStruct).length;
+
+  const transactionData = {
+    instruction,
+    bump,
+    seed,
+    space,
+    ...seedStruct,
+  };
+
+  const encoded = serialize(payloadSchema, transactionData);
+
+  const data = Buffer.from(encoded);
+  let tx = new Transaction().add(
+    new TransactionInstruction({
+      keys: [
+        {
+          pubkey: feePayer.publicKey,
+          isSigner: true,
+          isWritable: true,
+        },
+        {
+          pubkey: pda,
+          isSigner: false,
+          isWritable: true,
+        },
+        {
+          pubkey: SYSVAR_RENT_PUBKEY,
+          isSigner: false,
+          isWritable: false,
+        },
+        {
+          pubkey: SystemProgram.programId,
+          isSigner: false,
+          isWritable: false,
+        },
+      ],
+      data,
+      programId,
+    })
+  );
+
+  // Send Solana Transaction
+  const transactionSignature = await sendAndConfirmTransaction(
+    connection,
+    new Transaction().add(tx),
+    [feePayer]
+  );
+
+  console.log(
+    "Explorer = ",
+    `https://explorer.solana.com/tx/${transactionSignature}?cluster=devnet`
+  );
+}
+
+main();