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const std = @import("std");
const ProtocolError = @import("main.zig").ProtocolError;
const enum_from_int = @import("main.zig").enum_from_int;
const ByteArrayList = std.ArrayList(u8);
const ReadyForQuery = @This();
pub const Tag: u8 = 'Z';
const TransactionStatus = enum(u8) {
idle = 'I',
transaction = 'T',
err = 'E',
};
transaction_status: TransactionStatus,
pub fn read(allocator: std.mem.Allocator, b: []const u8) !ReadyForQuery {
_ = allocator;
if (b.len != 1) return ProtocolError.InvalidMessageLength;
return .{
.transaction_status = enum_from_int(TransactionStatus,b[0]) orelse return ProtocolError.InvalidTransactionStatus
};
}
pub fn write(self: ReadyForQuery, allocator: std.mem.Allocator, stream_writer: anytype) !void {
_ = allocator;
try stream_writer.writeByte(Tag);
try stream_writer.writeIntBig(u32, 5);
try stream_writer.writeByte(@intFromEnum(self.transaction_status));
}
pub fn deinit(_: *ReadyForQuery, _: std.mem.Allocator) void {}
test "round trip" {
const allocator = std.testing.allocator;
var sm = ReadyForQuery{
.transaction_status = TransactionStatus.idle,
};
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 ReadyForQuery.read(allocator, buf);
defer sm2.deinit(allocator);
try std.testing.expectEqual(TransactionStatus.idle, sm2.transaction_status);
}
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