Get file contents

examples/get-file-contents.js

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+/* eslint-disable n/no-extraneous-import */
+import {
+    PrivateKey,
+    FileContentsQuery,
+    Hbar,
+    FileCreateTransaction,
+    FileDeleteTransaction,
+    Client,
+    AccountId,
+} from "@hashgraph/sdk";
+import dotenv from "dotenv";
+
+import pino from "pino";
+import pinoPretty from "pino-pretty";
+
+dotenv.config();
+
+// Set default log level to 'silent' if SDK_LOG_LEVEL is not specified in .env
+const SDK_LOG_LEVEL = process.env.SDK_LOG_LEVEL || "SILENT";
+
+// Logger configuration based on SDK_LOG_LEVEL
+const logger = pino(
+    {
+        level: SDK_LOG_LEVEL.toUpperCase(), 
+    },
+    pinoPretty({
+        colorize: true,
+        translateTime: "SYS:standard",
+        ignore: "pid,hostname",
+    }),
+);
+
+/**
+ * How to get file contents
+ *
+ */
+
+async function main() {
+    /**
+     * Step 0:
+     * Create and configure the SDK Client
+     */
+    if (
+        !process.env.OPERATOR_ID ||
+        !process.env.OPERATOR_KEY ||
+        !process.env.HEDERA_NETWORK
+    ) {
+        logger.error(
+            "Environment variables OPERATOR_ID, OPERATOR_KEY, and HEDERA_NETWORK are required.",
+        );
+        throw new Error("Missing required environment variables.");
+    }
+
+    const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
+    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+
+    //  Create the client based on the HEDERA_NETWORK environment variable
+    let client = Client.forName(process.env.HEDERA_NETWORK);
+
+    client.setOperator(operatorId, operatorKey);
+
+    /**
+     * Step 1: Submit the file create transaction
+     */
+
+    // Content to be stored in the file.
+    const fileContents = Buffer.from("Hedera is great!", "utf-8");
+
+    try {
+        logger.info("Creating new file...");
+
+        // Create the transaction
+        let transaction = new FileCreateTransaction()
+            .setKeys([operatorKey.publicKey])
+            .setContents(fileContents)
+            .setMaxTransactionFee(new Hbar(2))
+            .freezeWith(client);
+
+        transaction = await transaction.sign(operatorKey);
+
+        const response = await transaction.execute(client);
+
+        const receipt = await response.getReceipt(client);
+
+        // Get the file ID
+        const newFileId = receipt.fileId;
+        logger.info(`Created new file with ID: ${newFileId.toString()}`);
+
+        /**
+         * Step 2: Get file contents and print them
+         */
+
+        const fileContentsQuery = await new FileContentsQuery()
+            .setFileId(newFileId)
+            .execute(client);
+
+        logger.info("File contents: " + fileContentsQuery.toString());
+
+        // Clean up: Delete created file
+        const fileDeleteTxResponse = await new FileDeleteTransaction()
+            .setFileId(newFileId)
+            .execute(client);
+
+        await fileDeleteTxResponse.getReceipt(client);
+
+        logger.info("File deleted successfully");
+    } catch (error) {
+        logger.error("Error occurred during file creation:", error);
+    } finally {
+        client.close();
+        logger.info("Get File Contents Example Complete!");
+    }
+}
+
+void main();