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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 ParameterStatus = @This();
pub const Tag: u8 = 'S';
buf: ?[]const u8 = null, // owned
name: []const u8,
value: []const u8,
pub fn read(allocator: std.mem.Allocator, b: []const u8) !ParameterStatus {
var res: ParameterStatus = undefined;
res.buf = try allocator.dupe(u8, b);
var it = std.mem.splitScalar(u8, res.buf.?, 0);
res.name = it.first();
res.value = it.next() orelse return ProtocolError.MissingField;
return res;
}
pub fn write(self: ParameterStatus, a: std.mem.Allocator, stream_writer: anytype) !void {
try stream_writer.writeByte(Tag);
var al = ByteArrayList.init(a);
defer al.deinit();
var cw = std.io.countingWriter(al.writer());
var writer = cw.writer();
try writer.writeIntBig(u32, 0); // length placeholder
try writer.writeAll(self.name);
try writer.writeByte(0);
try writer.writeAll(self.value);
try writer.writeByte(0);
std.mem.writeIntBig(u32, al.items[0..4], @as(u32,@intCast(cw.bytes_written))); // Fix length
try stream_writer.writeAll(al.items);
}
pub fn deinit(self: *ParameterStatus, allocator: std.mem.Allocator) void {
if (self.buf != null) allocator.free(self.buf.?);
}
test "round trip" {
const allocator = std.testing.allocator;
var sm = ParameterStatus{
.name = "Hello",
.value = "world",
};
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 ParameterStatus.read(allocator, buf);
defer sm2.deinit(allocator);
try std.testing.expectEqualStrings("Hello", sm2.name);
try std.testing.expectEqualStrings("world", sm2.value);
}
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