fix(cli): correct data conversion for publishing messages with format

cli/src/lib/pub.ts

@@ -1,38 +1,57 @@
+import concat from 'concat-stream'
+import * as Debug from 'debug'
+import _ from 'lodash'
 import * as mqtt from 'mqtt'
+import { IClientOptions, IClientPublishOptions } from 'mqtt'
 import pump from 'pump'
-import concat from 'concat-stream'
 import { Writable } from 'readable-stream'
 import split2 from 'split2'
-import { IClientOptions, IClientPublishOptions } from 'mqtt'
-import logWrapper, { Signale, basicLog, benchLog, simulateLog, singaleConfig, signale } from '../utils/logWrapper'
-import { parseConnectOptions, parsePublishOptions, checkTopicExists, checkScenarioExists } from '../utils/parse'
+import convertPayload from '../utils/convertPayload'
 import delay from '../utils/delay'
-import { handleSaveOptions, handleLoadOptions } from '../utils/options'
-import { loadSimulator } from '../utils/simulate'
+import { fileDataSplitter, processPath, readFile } from '../utils/fileUtils'
+import logWrapper, { basicLog, benchLog, Signale, signale, simulateLog, singaleConfig } from '../utils/logWrapper'
+import { handleLoadOptions, handleSaveOptions } from '../utils/options'
+import { checkScenarioExists, checkTopicExists, parseConnectOptions, parsePublishOptions } from '../utils/parse'
 import { serializeProtobufToBuffer } from '../utils/protobuf'
-import { readFile, processPath, fileDataSplitter } from '../utils/fileUtils'
-import convertPayload from '../utils/convertPayload'
-import * as Debug from 'debug'
-import _ from 'lodash'
+import { loadSimulator } from '../utils/simulate'
 
+/**
+ * Processes the outgoing message through two potential stages:
+ * 1. Format Conversion: If a format is specified, transform the message into that format.
+ *    If no format is specified, the message retains its initial state.
+ * 2. Protobuf Serialization: If both protobuf path and message name are present,
+ *    encapsulate the message into a protobuf format. If these settings are absent,
+ *    the message remains unchanged.
+ * Flow:
+ *   Input Message -> [Format Conversion] -> [Protobuf Serialization] -> Output Message
+ * @param {string | Buffer} message - The message to be processed.
+ * @param {string} [protobufPath] - The path to the protobuf definition.
+ * @param {string} [protobufMessageName] - The name of the protobuf message.
+ * @param {FormatType} [format] - The format to convert the message to.
+ * @returns {Buffer | string} - The processed message.
+ */
 const processPublishMessage = (
   message: string | Buffer,
   protobufPath?: string,
   protobufMessageName?: string,
   format?: FormatType,
 ): Buffer | string => {
-  /*
-   * Pipeline for processing outgoing messages in two potential stages:
-   * 1. Format Conversion --> Applied if a format is specified, transforming the message into that format; if absent, the message retains its initial state.
-   * 2. Protobuf Serialization --> Engaged if both protobuf path and message name are present, encapsulating the message into a protobuf format; without these settings, the message circulates unchanged.
-   */
-  const pipeline = [
-    (msg: string | Buffer) => (format ? convertPayload(Buffer.from(msg.toString()), format, 'encode') : msg),
-    (msg: string | Buffer) =>
-      protobufPath && protobufMessageName
-        ? serializeProtobufToBuffer(msg.toString(), protobufPath, protobufMessageName)
-        : msg,
-  ]
+  const convertMessageFormat = (msg: string | Buffer): Buffer | string => {
+    if (!format) {
+      return msg
+    }
+    const bufferMsg = Buffer.isBuffer(msg) ? msg : Buffer.from(msg.toString())
+    return convertPayload(bufferMsg, format, 'encode')
+  }
+
+  const serializeProtobufMessage = (msg: string | Buffer): Buffer | string => {
+    if (protobufPath && protobufMessageName) {
+      return serializeProtobufToBuffer(msg.toString(), protobufPath, protobufMessageName)
+    }
+    return msg
+  }
+
+  const pipeline = [convertMessageFormat, serializeProtobufMessage]
 
   return pipeline.reduce((msg, transformer) => transformer(msg), message) as Buffer
 }