examples: port header example to zig
This looks a lot nicer than its c counterpart, in my opinion.
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@ -53,6 +53,7 @@ const Example = struct {
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const examples = [_]Example{
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.{ .name = "request_reply", .file = "examples/request_reply.zig" },
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.{ .name = "headers", .file = "examples/headers.zig" },
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};
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pub fn add_examples(b: *std.build, options: ExampleOptions) void {
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62
examples/headers.zig
Normal file
62
examples/headers.zig
Normal file
@ -0,0 +1,62 @@
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const std = @import("std");
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const nats = @import("nats");
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pub fn main() !void {
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const connection = try nats.Connection.connectTo(nats.default_server_url);
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defer connection.destroy();
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const message = try nats.Message.create("subject", null, "message");
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defer message.destroy();
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try message.setHeaderValue("My-Key1", "value1");
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try message.setHeaderValue("My-Key2", "value2");
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try message.addHeaderValue("My-Key1", "value3");
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try message.setHeaderValue("My-Key3", "value4");
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try message.deleteHeader("My-Key3");
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var iter = try message.headerIterator();
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defer iter.destroy();
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while (try iter.next()) |pair| {
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std.debug.print(
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"Key: '{s}', Value: '{s}'\n",
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.{ pair.key, pair.value orelse "null" },
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);
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}
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const subscription = try connection.subscribeSync("subject");
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defer subscription.destroy();
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try connection.publishMessage(message);
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const received = try subscription.nextMessage(1000);
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defer received.destroy();
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{
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const vals1 = try received.getAllHeaderValues("My-Key1");
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defer std.heap.raw_c_allocator.free(vals1);
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std.debug.print("For key 'My-Key1' got: ", .{});
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for (vals1) |value| {
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const val = std.mem.sliceTo(value, 0);
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std.debug.print("'{s}', ", .{val});
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}
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std.debug.print("\n", .{});
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}
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_ = received.getHeaderValue("key-does-not-exist") catch |err| switch (err) {
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nats.Error.NotFound => {},
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else => {
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std.debug.print("Should not have found that key!", .{});
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return err;
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},
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};
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received.deleteHeader("key-does-not-exist") catch |err| switch (err) {
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nats.Error.NotFound => {},
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else => {
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std.debug.print("Should not have found that key!", .{});
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return err;
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},
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};
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}
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