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const std = @import("std");
const HMByteString = std.AutoHashMap(u8, []const u8);
const ByteArrayList = std.ArrayList(u8);
const ProtocolError = @import("main.zig").ProtocolError;
const ErrorResponse = @This();
const Tag: u8 = 'E';
buf: ?[]const u8 = null, // owned
severity: []const u8,
severity_unlocalized: ?[]const u8 = null,
code: []const u8,
message: []const u8,
detail: ?[]const u8 = null,
hint: ?[]const u8 = null,
position: ?u32 = null,
internal_position: ?u32 = null,
internal_query: ?[]const u8 = null,
where: ?[]const u8 = null,
schema_name: ?[]const u8 = null,
table_name: ?[]const u8 = null,
column_name: ?[]const u8 = null,
data_type_name: ?[]const u8 = null,
constraint_name: ?[]const u8 = null,
file_name: ?[]const u8 = null,
line: ?u32 = null,
routine: ?[]const u8 = null,
unknown_fields: HMByteString,
pub fn read(allocator: std.mem.Allocator, b: []const u8) !ErrorResponse {
var res: ErrorResponse = undefined;
res.unknown_fields = HMByteString.init(allocator);
res.buf = try allocator.dupe(u8, b);
errdefer allocator.free(res.buf.?);
var it = std.mem.splitScalar(u8, res.buf.?, 0);
var setSev = false; var setCode = false; var setMsg = false;
while (it.next()) |next| {
if (next.len < 1) break;
switch (next[0]) {
0 => break,
'S' => {
res.severity = next[1..];
setSev = true;
},
'V' => {
res.severity_unlocalized = next[1..];
},
'C' => {
res.code = next[1..];
setCode = true;
},
'M' => {
res.message = next[1..];
setMsg = true;
},
'D' => {
res.detail = next[1..];
},
'H' => {
res.hint = next[1..];
},
'P' => {
res.position = try std.fmt.parseInt(u32, next[1..], 10);
},
'p' => {
res.internal_position = try std.fmt.parseInt(u32, next[1..], 10);
},
'q' => {
res.internal_query = next[1..];
},
'W' => {
res.where = next[1..];
},
's' => {
res.schema_name = next[1..];
},
't' => {
res.table_name = next[1..];
},
'c' => {
res.column_name = next[1..];
},
'd' => {
res.data_type_name = next[1..];
},
'n' => {
res.constraint_name = next[1..];
},
'F' => {
res.file_name = next[1..];
},
'L' => {
res.line = try std.fmt.parseInt(u32, next[1..], 10);
},
'R' => {
res.routine = next[1..];
},
else => {
try res.unknown_fields.put(next[0], next[1..]);
}
}
}
if (!(setSev and setCode and setMsg)) return ProtocolError.MissingField;
return res;
}
pub fn write(self: ErrorResponse, allocator: std.mem.Allocator, stream_writer: anytype) !void {
try stream_writer.writeByte(Tag);
var al = ByteArrayList.init(allocator);
defer al.deinit();
var cw = std.io.countingWriter(al.writer());
var writer = cw.writer();
try writer.writeIntBig(u32, 0); // Length placeholder.
try write_field_nt('S', self, "severity", writer);
if (self.severity_unlocalized) |severity_unlocalized| {
try write_nt('V', severity_unlocalized, writer);
}
try write_field_nt('C', self, "code", writer);
try write_field_nt('M', self, "message", writer);
// TODO rest of the fields
// replace the length and write it to the actual stream
std.mem.writeIntBig(u32, al.items[0..4], @as(u32, @intCast(cw.bytes_written)));
try stream_writer.writeAll(al.items);
}
fn write_field_nt(comptime tag: u8, self: ErrorResponse, comptime field: []const u8, writer: anytype) !void {
try write_nt(tag, @field(self, field), writer);
}
fn write_nt(comptime tag: u8, value: []const u8, writer: anytype) !void {
try writer.writeByte(tag);
try writer.writeAll(value);
try writer.writeByte(0);
}
pub fn deinit(self: *ErrorResponse, allocator: std.mem.Allocator) void {
self.unknown_fields.deinit();
if (self.buf != null) allocator.free(self.buf.?);
}
test "round trip" {
const allocator = std.testing.allocator;
var sm = ErrorResponse{
.severity = "foo",
.severity_unlocalized = "foo_unlocal",
.code = "bar",
.message = "baz",
.unknown_fields = HMByteString.init(allocator),
};
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 ErrorResponse.read(allocator, buf);
defer sm2.deinit(allocator);
try std.testing.expectEqualStrings("foo", sm2.severity);
try std.testing.expectEqualStrings("foo_unlocal", sm2.severity_unlocalized.?);
try std.testing.expectEqualStrings("bar", sm2.code);
try std.testing.expectEqualStrings("baz", sm2.message);
}
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