nats.zig/examples/headers.zig

72 lines
2.2 KiB
Zig

// This file is licensed under the CC0 1.0 license.
// See: https://creativecommons.org/publicdomain/zero/1.0/legalcode
const std = @import("std");
const nats = @import("nats");
pub fn main() !void {
const connection = try nats.Connection.connectTo(nats.default_server_url);
defer connection.destroy();
const message = try nats.Message.create("subject", null, "message");
defer message.destroy();
try message.setHeaderValue("foo", "foo-value");
try message.setHeaderValue("bar", "bar-value");
try message.addHeaderValue("foo", "bar-value");
try message.setHeaderValue("baz", "baz-value");
try message.addHeaderValue("qux", "qux-value");
try message.deleteHeader("baz");
{
var iter = try message.getHeaderIterator();
defer iter.destroy();
while (iter.next()) |header| {
var val_iter = try header.valueIterator();
defer val_iter.destroy();
std.debug.print("key '{s}' got: ", .{header.key});
while (val_iter.next()) |value| {
std.debug.print("'{s}'{s}", .{ value, if (val_iter.peek()) |_| ", " else "" });
}
std.debug.print("\n", .{});
}
}
const subscription = try connection.subscribeSync("subject");
defer subscription.destroy();
try connection.publishMessage(message);
const received = try subscription.nextMessage(1000);
defer received.destroy();
{
var iter = try received.getHeaderValueIterator("foo");
defer iter.destroy();
std.debug.print("For key 'foo' got: ", .{});
while (iter.next()) |value| {
std.debug.print("'{s}'{s}", .{ value, if (iter.peek()) |_| ", " else "" });
}
std.debug.print("\n", .{});
}
_ = received.getHeaderValue("key-does-not-exist") catch |err| switch (err) {
nats.Error.NotFound => {},
else => {
std.debug.print("Should not have found that key!", .{});
return err;
},
};
received.deleteHeader("key-does-not-exist") catch |err| switch (err) {
nats.Error.NotFound => {},
else => {
std.debug.print("Should not have found that key!", .{});
return err;
},
};
}