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endpoint type check with meaningful error messages

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renerocksai 2025-03-16 13:39:01 +01:00
parent 8e80eecc3e
commit 0123e60059
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1 changed files with 30 additions and 0 deletions
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30
src/endpoint.zig
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@ -9,6 +9,34 @@ const Request = zap.Request;
const ListenerSettings = zap.HttpListenerSettings; const ListenerSettings = zap.HttpListenerSettings;
const HttpListener = zap.HttpListener; const HttpListener = zap.HttpListener;
pub fn checkEndpointType(T: type) void {
if (@hasField(T, "path")) {
if (@FieldType(T, "path") != []const u8) {
@compileError(@typeName(@FieldType(T, "path")) ++ " has wrong type, expected: []const u8");
}
} else {
@compileError(@typeName(T) ++ " has no path field");
}
const methods_to_check = [_][]const u8{
"get",
"post",
"put",
"delete",
"patch",
"options",
};
inline for (methods_to_check) |method| {
if (@hasDecl(T, method)) {
if (@TypeOf(@field(T, method)) != fn (_: *T, _: Request) void) {
@compileError(method ++ " method of " ++ @typeName(T) ++ " has wrong type:\n" ++ @typeName(@TypeOf(T.get)) ++ "\nexpected:\n" ++ @typeName(fn (_: *T, _: Request) void));
}
} else {
@compileError(@typeName(T) ++ " has no method named `" ++ method ++ "`");
}
}
}
const EndpointWrapper = struct { const EndpointWrapper = struct {
pub const Wrapper = struct { pub const Wrapper = struct {
call: *const fn (*Wrapper, zap.Request) void = undefined, call: *const fn (*Wrapper, zap.Request) void = undefined,
@ -53,6 +81,7 @@ const EndpointWrapper = struct {
} }
pub fn init(T: type, value: *T) EndpointWrapper.Wrap(T) { pub fn init(T: type, value: *T) EndpointWrapper.Wrap(T) {
checkEndpointType(T);
var ret: EndpointWrapper.Wrap(T) = .{ var ret: EndpointWrapper.Wrap(T) = .{
.wrapped = value, .wrapped = value,
.wrapper = .{ .path = value.path }, .wrapper = .{ .path = value.path },
@ -218,6 +247,7 @@ pub const Listener = struct {
} }
} }
const EndpointType = @typeInfo(@TypeOf(e)).pointer.child; const EndpointType = @typeInfo(@TypeOf(e)).pointer.child;
checkEndpointType(EndpointType);
const wrapper = try self.allocator.create(EndpointWrapper.Wrap(EndpointType)); const wrapper = try self.allocator.create(EndpointWrapper.Wrap(EndpointType));
wrapper.* = EndpointWrapper.init(EndpointType, e); wrapper.* = EndpointWrapper.init(EndpointType, e);
try endpoints.append(self.allocator, &wrapper.wrapper); try endpoints.append(self.allocator, &wrapper.wrapper);