[GitHub] [pulsar-client-node] freeart opened a new pull request #37: added serialize/deserialize methods to set custom startMessageId in createReader

[GitBox]

freeart opened a new pull request #37: added serialize/deserialize methods to 
set custom startMessageId in createReader 
URL: https://github.com/apache/pulsar-client-node/pull/37
 
 
   To restore Reader from the custom message needs to provide startMessageId
   ```js
   const msg = await reader.readNext();
   const msgId = msg.getMessageId().serialize() // native Buffer
   msgId.toString("hex") // returns "085a10002000" as binary string
   ```
   The cursor can be restored from binary string
   ```js
   const msgId = Buffer.from("085a10002000", "hex")
   const reader = await client.createReader({
        topic: 'persistent://public/default/my-topic',
        startMessageId: Pulsar.MessageId.deserialize(msgId)
   });
   ```

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