React Native

Azure Service Bus - Read Queued Message

See more Azure Service Bus Examples

Demonstrates read a message from an Azure Service Bus Queue. The message is received and removed from the queue. React Native

import { Rest, StringBuilder } from '@chilkat/react-native'

async function chilkatExample() {
  // Note: Requires Chilkat v9.5.0.65 or greater.

  // This requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  // Make the initial connection.
  // A single REST object, once connected, can be used for many Azure Service Bus REST API calls.
  // The auto-reconnect indicates that if the already-established HTTPS connection is closed,
  // then it will be automatically re-established as needed.
  const rest = new Rest();
  const bAutoReconnect = true;
  try {
    await rest.connectAsync('<yournamespace>.servicebus.windows.net', 443, true, bAutoReconnect);
  } catch {
    console.log(rest.lastErrorText);
    return;
  }

  // ----------------------------------------------------------------------------------------------
  // The code above this comment could be placed inside a function/subroutine within the application
  // because the connection does not need to be made for every request.  Once the connection is made
  // the app may send many requests..
  // ----------------------------------------------------------------------------------------------

  // Receive and delete a message from a queue named "gila";
  const queueName = 'gila';

  // Let's load a previously computed SAS token and use it.
  // See Azure Shared Access Signature for an example to genenerate an Azure SAS token.
  const sbToken = new StringBuilder();
  sbToken.loadFile('qa_data/tokens/serviceBusSas.txt', 'utf-8');

  // Tell the REST object to use the Azure Shared Access Signature for authorization.
  sbToken.prepend('SharedAccessSignature ');
  rest.addHeader('Authorization', sbToken.getAsString());

  // Build the path..
  const sbPath = new StringBuilder();
  sbPath.append('/');
  sbPath.append(queueName);
  sbPath.append('/messages/head');

  // Add timeout and api-version query parameters.
  rest.addQueryParam('timeout', '20');
  rest.addQueryParam('api-version', '2013-08');

  // Use the DELETE HTTP verb to read the message at the head of the queue and remove it.
  const sbResponseBody = new StringBuilder();
  try {
    await rest.fullRequestNoBodySbAsync('DELETE', sbPath.getAsString(), sbResponseBody);
  } catch {
    console.log(rest.lastErrorText);
    return;
  }

  console.log(`Response Status Code = ${rest.responseStatusCode}`);

  // Check for a success response.
  if (rest.responseStatusCode !== 200) {
    console.log(rest.lastRequestStartLine);
    console.log(rest.lastRequestHeader);
    console.log(sbResponseBody.getAsString());
    console.log('Failed.');
    return;
  }

  // If successful, the message is the contents of the response body.
  const message = sbResponseBody.getAsString();
  console.log(`Dequeued message: ${message}`);

  console.log('Success.');
}