deserialize program data in log notification

External question — Solana Stack Exchange Author: Michael Dee Original post: https://solana.stackexchange.com/questions/18378 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. I am trying to decode program data in a log notification with the following code: import { deserialize } from "borsh"; const LOG_PROGRAMDATA_SCHEMA = { struct: { name: "string" ,symbol: "string", uri: "string" } //from solnafm }; const program_data = 'G3KpTd7rY3YNAAAAQlVORExFRCBQRU5HVQYAAABCVU5ETEVDAAAAaHR0cHM6Ly9pcGZzLmlvL2lwZnMvUW1ZdzY1WkxQMUhUdXFOdzNrQllpdXhkRGNQOW5xWTJlSmpZdGpTd1lZS05ZQwQRBm8MluSSPn07JLVylyl9fEhruZBBGubiqpRNzNif9xQ6WBKoNWbAilWVgC2UlsFyeY5hOr4G4Yj5QaW+bQZtjdsv57C0K2nWYY2eQ5dY4P5I0CDudhEcxFNJN62RZw==' const buffer = Buffer.from(program_data, "base64"); const len = buffer.length; // console.log("Buffer:", buffer.toString()); try { const decoded = deserialize(LOG_PROGRAMDATA_SCHEMA, buffer, false); console.log("Decoded:", decoded); } catch (e) { console.log("Error:", e); } but got this error: Error: Error: Error in schema, the buffer is smaller than expected at DecodeBuffer.assert_enough_buffer (file:///mnt/4T/yolo/data/helius/node_modules/.pnpm/borsh@2.0.0/node_modules/borsh/lib/esm/buffer.js:46:19) at DecodeBuffer.consume_bytes (file:///mnt/4T/yolo/data/helius/node_modules/.pnpm/borsh@2.0.0/node_modules/borsh/lib/esm/buffer.js:59:14) at BorshDeserializer.decode_string (file:///mnt/4T/yolo/data/helius/node_modules/.pnpm/borsh@2.0.0/node_modules/borsh/lib/esm/deserialize.js:54:49) at BorshDeserializer.decode_value (file:///mnt/4T/yolo/data/helius/node_modules/.pnpm/borsh@2.0.0/node_modules/borsh/lib/esm/deserialize.js:15:29) at BorshDeserializer.decode_struct (file:///mnt/4T/yolo/data/helius/node_modules/.pnpm/borsh@2.0.0/node_modules/borsh/lib/esm/deserialize.js:129:32) at BorshDeserializer.decode_value (file:///mnt/4T/yolo/data/helius/node_modules/.pnpm/borsh@2.0.0/node_modules/borsh/lib/esm/deserialize.js:31:29) at BorshDeserializer.decode (file:///mnt/4T/yolo/data/helius/node_modules/.pnpm/borsh@2.0.0/node_modules/borsh/lib/esm/deserialize.js:8:21) at deserialize (file:///mnt/4T/yolo/data/helius/node_modules/.pnpm/borsh@2.0.0/node_modules/borsh/lib/esm/index.js:16:25) at <anonymous> (/mnt/4T/yolo/data/helius/testDeserialize.ts:12:19) I can the original buffer is string is large enough, and print out the buffer, I can see the name and symbols and uri. Why did I get this error?

External answer — Solana Stack Exchange Author: mumutik Original post: https://solana.stackexchange.com/a/18379 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. The error you're encountering with the borsh library in your deserialization code is due to an improperly defined schema. The LOG_PROGRAMDATA_SCHEMA does not match the expected structure needed for deserialization with Borsh. Here's what you need to fix: Define a proper schema: Ensure that the schema correctly defines the structure of your serialized data. Deserialization function : Utilize the correct functionality of Borsh's deserialize method. Updated Code Example First, correct the schema definition. It should follow the structure expected by Borsh. import { deserialize, Schema, BinaryReader, BinaryWriter } from 'borsh'; import base58 from 'bs58'; class LogProgramData { constructor(properties) { Object.keys(properties).forEach((key) => { this[key] = properties[key]; }); } } const schema = new Map([ [LogProgramData, { kind: 'struct', fields: [ ['name', 'string'], ['symbol', 'string'], ['uri', 'string'], ] }] ]); const program_data_base64 = 'G3KpTd7rY3YNAAAAQlVORExFRCBQRU5HVQYAAABCVU5ETEVDAAAAaHR0cHM6Ly9pcGZzLmlvL2lwZnMvUW1ZdzY1WkxQMUhUdXFOdzNrQllpdXhkRGNQOW5xWTJlSmpZdGpTd1lZS05ZQwQRBm8MluSSPn07JLVylyl9fEhruZBBGubiqpRNzNif9xQ6WBKoNWbAilWVgC2UlsFyeY5hOr4G4Yj5QaW+bQZtjdsv57C0K2nWYY2eQ5dY4P5I0CDudhEcxFNJN62RZw=='; const buffer = Buffer.from(program_data_base64, 'base64'); try { const decoded = deserialize(schema, LogProgramData, buffer); console.log('Decoded:', decoded); } catch (e) { console.error('Error:', e); } Explanation : Define the Class: Create a class LogProgramData that matches the structure of your data. Create Schema: Use borsh to create a schema describing the structure of your data. Deserialize: Pass the schema, the class, and the buffer into the deserialize method. This should resolve the Error in schema, the buffer is smaller than expected issue and let you successfully deserialize the program data.

deserialize program data in log notification

deserialize program data in log notification

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