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const std = @import("std");
const log = std.log.scoped(.pgz);
const ByteArrayList = std.ArrayList(u8);
const ProtocolError = @import("main.zig").ProtocolError;
const ClientError = @import("main.zig").ClientError;
const BackendKeyData = @This();
pub const Tag: u8 = 'K';
process_id: u32,
secret_key: u32,
pub fn read(_: std.mem.Allocator, b: []const u8) !BackendKeyData {
if (b.len != 8) return ProtocolError.InvalidMessageLength;
return .{
.process_id = std.mem.readIntBig(u32, b[0..4]),
.secret_key = std.mem.readIntBig(u32, b[4..8]),
};
}
pub fn write(self: BackendKeyData, _: std.mem.Allocator, stream_writer: anytype) !void {
try stream_writer.writeByte(Tag);
try stream_writer.writeIntBig(u32, 12); // length
try stream_writer.writeIntBig(u32, self.process_id);
try stream_writer.writeIntBig(u32, self.secret_key);
}
pub fn deinit(_: *BackendKeyData, _: std.mem.Allocator) void {}
test "round trip" {
const allocator = std.testing.allocator;
var sm = BackendKeyData{
.process_id = 123,
.secret_key = 345,
};
defer sm.deinit(allocator);
var bal = ByteArrayList.init(allocator);
defer bal.deinit();
try sm.write(allocator, bal.writer());
var fbs = std.io.fixedBufferStream(bal.items);
var reader = fbs.reader();
const tag = try reader.readByte();
try std.testing.expectEqual(Tag, tag);
const len = try reader.readIntBig(u32);
const buf = try allocator.alloc(u8, len - 4);
defer allocator.free(buf);
try reader.readNoEof(buf);
var sm2 = try BackendKeyData.read(allocator, buf);
defer sm2.deinit(allocator);
try std.testing.expectEqual(@as(u32, 123), sm2.process_id);
try std.testing.expectEqual(@as(u32, 345), sm2.secret_key);
}
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