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-rw-r--r--src/proto/copy_in_response.zig83
1 files changed, 83 insertions, 0 deletions
diff --git a/src/proto/copy_in_response.zig b/src/proto/copy_in_response.zig
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+++ b/src/proto/copy_in_response.zig
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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;
+const FormatCode = @import("../main.zig").FormatCode;
+
+pub const Tag: u8 = 'G';
+// TODO generics it's the same as CopyOutResponse and CopyBothResponse.
+const CopyInResponse = @This();
+
+overall_format_code: u8,
+format_codes: []const FormatCode, // owned
+
+pub fn read(a: std.mem.Allocator, b: []const u8) !CopyInResponse {
+ var fbs = std.io.fixedBufferStream(b);
+ var reader = fbs.reader();
+ const overall_format_code = try reader.readIntBig(u8);
+ const n_columns = try reader.readIntBig(u16);
+ var format_codes = try a.alloc(FormatCode, n_columns);
+ errdefer a.free(format_codes);
+ for (0..n_columns) |i| {
+ const int_format_code = try reader.readIntBig(u16);
+ format_codes[i] = enum_from_int(FormatCode, int_format_code) orelse return ProtocolError.InvalidFormatCode;
+ }
+ return .{
+ .overall_format_code = overall_format_code,
+ .format_codes = format_codes,
+ };
+}
+
+pub fn write(self: CopyInResponse, a: std.mem.Allocator, stream_writer: anytype) !void {
+ try stream_writer.writeIntBig(u8, 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.writeIntBig(u8, self.overall_format_code);
+ try writer.writeIntBig(u16, @intCast(self.format_codes.len));
+ for (self.format_codes) |format_code| {
+ try writer.writeIntBig(u16, @intFromEnum(format_code));
+ }
+ std.mem.writeIntBig(u32, al.items[0..4], @as(u32, @intCast(cw.bytes_written))); // Update length
+ try stream_writer.writeAll(al.items);
+}
+
+pub fn deinit(self: *CopyInResponse, a: std.mem.Allocator) void {
+ a.free(self.format_codes);
+}
+
+test "round trip" {
+ const allocator = std.testing.allocator;
+ var format_codes = try allocator.alloc(FormatCode, 3);
+ format_codes[0] = .Binary;
+ format_codes[1] = .Binary;
+ format_codes[2] = .Text;
+ var sm = CopyInResponse{
+ .overall_format_code = 1,
+ .format_codes = format_codes,
+ };
+ 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 CopyInResponse.read(allocator, buf);
+ defer sm2.deinit(allocator);
+
+ try std.testing.expectEqual(FormatCode.Binary, sm2.format_codes[0]);
+ try std.testing.expectEqual(FormatCode.Binary, sm2.format_codes[1]);
+ try std.testing.expectEqual(FormatCode.Text, sm2.format_codes[2]);
+}