Zig

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. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // 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 = try chilkat.Rest.init();
    defer rest.deinit();
    const b_auto_reconnect = true;
    rest.connect("<yournamespace>.servicebus.windows.net", 443, true, b_auto_reconnect) catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        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 queue_name = "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 sb_token = try chilkat.StringBuilder.init();
    defer sb_token.deinit();
    sb_token.loadFile("qa_data/tokens/serviceBusSas.txt", "utf-8") catch {};

    // Tell the REST object to use the Azure Shared Access Signature for authorization.
    sb_token.prepend("SharedAccessSignature ") catch {};
    rest.addHeader("Authorization", try sb_token.getAsString(alloc)) catch {};

    // Build the path..
    const sb_path = try chilkat.StringBuilder.init();
    defer sb_path.deinit();
    sb_path.append("/") catch {};
    sb_path.append(queue_name) catch {};
    sb_path.append("/messages/head") catch {};

    // Add timeout and api-version query parameters.
    rest.addQueryParam("timeout", "20") catch {};
    rest.addQueryParam("api-version", "2013-08") catch {};

    // Use the DELETE HTTP verb to read the message at the head of the queue and remove it.
    const sb_response_body = try chilkat.StringBuilder.init();
    defer sb_response_body.deinit();
    rest.fullRequestNoBodySb("DELETE", try sb_path.getAsString(alloc), sb_response_body) catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Response Status Code = {d}\n", .{rest.getResponseStatusCode()});

    // Check for a success response.
    if (rest.getResponseStatusCode() != 200) {
        std.debug.print("{s}\n", .{try rest.getLastRequestStartLine(alloc)});
        std.debug.print("{s}\n", .{try rest.getLastRequestHeader(alloc)});
        std.debug.print("{s}\n", .{try sb_response_body.getAsString(alloc)});
        std.debug.print("Failed.\n", .{});
        return;
    }

    // If successful, the message is the contents of the response body.
    const message = try sb_response_body.getAsString(alloc);
    std.debug.print("Dequeued message: {s}\n", .{message});

    std.debug.print("Success.\n", .{});
}