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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 enum_from_int = @import("main.zig").enum_from_int;
pub const Tag: u8 = 'Q';
const Query = @This();
string: []const u8,
owned: bool = false,
pub fn read(a: std.mem.Allocator, b: []const u8) !Query {
return .{
.string = try a.dupe(u8, b[0..(b.len-1)]), // Drop the null terminator
.owned = true,
};
}
pub fn write(self: Query, _: std.mem.Allocator, stream_writer: anytype) !void {
try stream_writer.writeByte(Tag);
try stream_writer.writeIntBig(u32, @as(u32, @intCast(self.string.len+5)));
try stream_writer.writeAll(self.string);
try stream_writer.writeByte(0);
}
pub fn deinit(self: *Query, a: std.mem.Allocator) void {
if (self.owned) a.free(self.string);
}
test "round trip" {
const allocator = std.testing.allocator;
var sm = Query{
.string = "Hello",
};
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 Query.read(allocator, buf);
defer sm2.deinit(allocator);
try std.testing.expectEqualStrings("Hello", sm2.string);
}
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