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Check for IMAP IDLE Mailbox Updates

Demonstrates the Chilkat Imap.IdleCheck method, which waits for mailbox updates after IdleStart has entered IDLE mode. The only argument is a timeout in milliseconds; 0 performs a non-blocking poll of notifications already received. This example waits up to 30 seconds.

Background: IdleCheck consumes the notifications already waiting on the connection rather than sending a new polling command. A typical monitoring loop repeatedly calls IdleCheck with a timeout and reacts when updates arrive. Because servers usually drop an idle connection after about 29 minutes, long-lived monitors periodically call IdleDone and then IdleStart again to refresh it.

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

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

    // Demonstrates the Imap.IdleCheck method, which waits for IMAP IDLE mailbox updates and returns
    // them.  The only argument is a timeout in milliseconds.  Use 0 for a non-blocking poll.

    const imap = try chilkat.Imap.init();
    defer imap.deinit();

    imap.setSsl(true);
    imap.setPort(993);

    imap.connect("imap.example.com") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.login("user@example.com", "myPassword") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.selectMailbox("Inbox") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.idleStart() catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    // Wait up to 30 seconds for mailbox updates.  IdleCheck returns a string, so assign it to a
    // string variable and check for success.
    const timeout_ms = 30000;
    const updates = imap.idleCheck(alloc, timeout_ms) catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

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

    imap.idleDone() catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.disconnect() catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };
}