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add metadata function

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This blows up the number of parameters on generateComplexTypeFor
at least this is a private function, but still kinda messay
This commit is contained in:
Emil Lerch 2021-06-09 16:14:09 -07:00
parent 03ef89a362
commit 4a10450e0e
Signed by: lobo
GPG Key ID: A7B62D657EF764F8
1 changed files with 60 additions and 22 deletions
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82
src/codegen/src/main.zig
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@ -126,7 +126,7 @@ fn generateServices(allocator: *std.mem.Allocator, comptime terminator: []const
// Operations
for (service.shape.service.operations) |op|
try generateOperation(allocator, shapes.get(op).?, shapes, writer);
try generateOperation(allocator, shapes.get(op).?, shapes, writer, constant_name);
// End service
_ = try writer.write("} = .{}" ++ terminator ++ " // end of service: ");
@ -134,24 +134,31 @@ fn generateServices(allocator: *std.mem.Allocator, comptime terminator: []const
}
return constant_names.toOwnedSlice();
}
fn generateOperation(allocator: *std.mem.Allocator, operation: smithy.ShapeInfo, shapes: anytype, writer: anytype) !void {
fn generateOperation(allocator: *std.mem.Allocator, operation: smithy.ShapeInfo, shapes: anytype, writer: anytype, service: []const u8) !void {
const snake_case_name = try snake.fromPascalCase(allocator, operation.name);
defer allocator.free(snake_case_name);
comptime const prefix = " ";
var type_stack = std.ArrayList(*const smithy.ShapeInfo).init(allocator);
defer type_stack.deinit();
// indent should start at 4 spaces here
try writer.print(" {s}: struct ", .{snake_case_name});
const operation_name = avoidReserved(snake_case_name);
try writer.print(" {s}: struct ", .{operation_name});
_ = try writer.write("{\n");
try writer.print(" action_name: []const u8 = \"{s}\",\n", .{operation.name});
_ = try writer.write(" Request: type = ");
if (operation.shape.operation.input) |member| {
try generateTypeFor(allocator, member, shapes, writer, " ", false, &type_stack);
} else _ = try writer.write("struct {}"); // we want to maintain consistency with other ops
try generateTypeFor(allocator, member, shapes, writer, prefix, false, &type_stack, false);
_ = try writer.write("\n");
try generateMetadataFunction(service, operation_name, prefix, writer);
} else {
_ = try writer.write("struct {\n");
try generateMetadataFunction(service, operation_name, prefix, writer);
}
_ = try writer.write(",\n");
_ = try writer.write(" Response: type = ");
if (operation.shape.operation.output) |member| {
try generateTypeFor(allocator, member, shapes, writer, " ", true, &type_stack);
try generateTypeFor(allocator, member, shapes, writer, " ", true, &type_stack, true);
} else _ = try writer.write("struct {}"); // we want to maintain consistency with other ops
_ = try writer.write(",\n");
@ -166,6 +173,19 @@ fn generateOperation(allocator: *std.mem.Allocator, operation: smithy.ShapeInfo,
_ = try writer.write(" } = .{},\n");
}
fn generateMetadataFunction(service: []const u8, operation_name: []const u8, comptime prefix: []const u8, writer: anytype) !void {
// TODO: Shove these lines in here, and also the else portion
// pub fn metaInfo(self: @This()) struct { service: @TypeOf(sts), action: @TypeOf(sts.get_caller_identity) } {
// return .{ .service = sts, .action = sts.get_caller_identity };
// }
// We want to add a short "get my parents" function into the response
try writer.print("{s} ", .{prefix});
_ = try writer.write("pub fn metaInfo(self: @This()) struct { ");
try writer.print("service: @TypeOf({s}), action: @TypeOf({s}.{s})", .{ service, service, operation_name });
_ = try writer.write(" } {\n" ++ prefix ++ " return .{ ");
try writer.print(".service = {s}, .action = {s}.{s}", .{ service, service, operation_name });
_ = try writer.write(" };\n" ++ prefix ++ " }\n" ++ prefix ++ "}");
}
fn getErrorName(err_name: []const u8) []const u8 {
if (endsWith("Exception", err_name))
return err_name[0 .. err_name.len - "Exception".len];
@ -180,7 +200,7 @@ fn endsWith(item: []const u8, str: []const u8) bool {
return std.mem.eql(u8, item, str[str.len - item.len ..]);
}
/// return type is anyerror!void as this is a recursive function, so the compiler cannot properly infer error types
fn generateTypeFor(allocator: *std.mem.Allocator, shape_id: []const u8, shapes: anytype, writer: anytype, prefix: []const u8, all_required: bool, type_stack: anytype) anyerror!void {
fn generateTypeFor(allocator: *std.mem.Allocator, shape_id: []const u8, shapes: anytype, writer: anytype, prefix: []const u8, all_required: bool, type_stack: anytype, end_structure: bool) anyerror!void {
if (shapes.get(shape_id) == null) {
std.debug.print("Shape ID not found. This is most likely a bug. Shape ID: {s}\n", .{shape_id});
return error.InvalidType;
@ -213,6 +233,7 @@ fn generateTypeFor(allocator: *std.mem.Allocator, shape_id: []const u8, shapes:
// type to properly reference. Realistically, AWS or the service
// must be blocking deep recursion somewhere or this would be a great
// DOS attack
try generateSimpleTypeFor("nothing", "[]const u8", writer, all_required);
std.log.warn("Type cycle detected, limiting depth. Type: {s}", .{shape_id});
// std.log.info(" Type stack:\n", .{});
// for (type_stack.items) |i|
@ -221,17 +242,29 @@ fn generateTypeFor(allocator: *std.mem.Allocator, shape_id: []const u8, shapes:
}
try type_stack.append(&shape_info);
switch (shape) {
.structure => |s| try generateComplexTypeFor(allocator, shape.structure.members, "struct", shapes, writer, prefix, all_required, type_stack),
.uniontype => |s| try generateComplexTypeFor(allocator, shape.uniontype.members, "union", shapes, writer, prefix, all_required, type_stack),
.structure => |s| {
try generateComplexTypeFor(allocator, shape.structure.members, "struct", shapes, writer, prefix, all_required, type_stack);
if (end_structure) {
// epilog
try writer.print("{s}", .{prefix});
_ = try writer.write("}");
}
},
.uniontype => |s| {
try generateComplexTypeFor(allocator, shape.uniontype.members, "union", shapes, writer, prefix, all_required, type_stack);
// epilog
try writer.print("{s}", .{prefix});
_ = try writer.write("}");
},
.string => |s| try generateSimpleTypeFor(s, "[]const u8", writer, all_required),
.integer => |s| try generateSimpleTypeFor(s, "i64", writer, all_required),
.list => |s| {
_ = try writer.write("[]");
try generateTypeFor(allocator, shape.list.member_target, shapes, writer, prefix, all_required, type_stack);
try generateTypeFor(allocator, shape.list.member_target, shapes, writer, prefix, all_required, type_stack, true);
},
.set => |s| {
_ = try writer.write("[]");
try generateTypeFor(allocator, shape.set.member_target, shapes, writer, prefix, all_required, type_stack);
try generateTypeFor(allocator, shape.set.member_target, shapes, writer, prefix, all_required, type_stack, true);
},
.timestamp => |s| try generateSimpleTypeFor(s, "i64", writer, all_required),
.blob => |s| try generateSimpleTypeFor(s, "[]const u8", writer, all_required),
@ -245,12 +278,12 @@ fn generateTypeFor(allocator: *std.mem.Allocator, shape_id: []const u8, shapes:
defer allocator.free(new_prefix);
try writer.print("{s} key: ", .{prefix});
if (!all_required) try writeOptional(shape.map.traits, writer, null);
try generateTypeFor(allocator, shape.map.key, shapes, writer, prefix, all_required, type_stack);
try generateTypeFor(allocator, shape.map.key, shapes, writer, prefix, all_required, type_stack, true);
if (!all_required) try writeOptional(shape.map.traits, writer, " = null");
_ = try writer.write(",\n");
try writer.print("{s} value: ", .{prefix});
if (!all_required) try writeOptional(shape.map.traits, writer, null);
try generateTypeFor(allocator, shape.map.key, shapes, writer, prefix, all_required, type_stack);
try generateTypeFor(allocator, shape.map.key, shapes, writer, prefix, all_required, type_stack, true);
if (!all_required) try writeOptional(shape.map.traits, writer, " = null");
_ = try writer.write(",\n");
_ = try writer.write(prefix);
@ -278,16 +311,13 @@ fn generateComplexTypeFor(allocator: *std.mem.Allocator, members: []smithy.TypeM
defer allocator.free(new_prefix);
const snake_case_member = try snake.fromPascalCase(allocator, member.name);
defer allocator.free(snake_case_member);
try writer.print("{s} {s}: ", .{ prefix, snake_case_member });
try writer.print("{s} {s}: ", .{ prefix, avoidReserved(snake_case_member) });
if (!all_required) try writeOptional(member.traits, writer, null);
try generateTypeFor(allocator, member.target, shapes, writer, new_prefix, all_required, type_stack);
if (!all_required) try writeOptional(member.traits, writer, " = null");
try generateTypeFor(allocator, member.target, shapes, writer, new_prefix, all_required, type_stack, true);
if (!all_required and !std.mem.eql(u8, "union", type_type_name))
try writeOptional(member.traits, writer, " = null");
_ = try writer.write(",\n");
}
// epilog
try writer.print("{s}", .{prefix});
_ = try writer.write("}");
}
fn writeOptional(traits: ?[]smithy.Trait, writer: anytype, value: ?[]const u8) !void {
@ -299,11 +329,19 @@ fn writeOptional(traits: ?[]smithy.Trait, writer: anytype, value: ?[]const u8) !
// not required
if (value) |v| {
_ = try writer.write(v);
} else
_ = try writer.write("?");
} else _ = try writer.write("?");
}
fn camelCase(allocator: *std.mem.Allocator, name: []const u8) ![]const u8 {
const first_letter = name[0] + ('a' - 'A');
return try std.fmt.allocPrint(allocator, "{c}{s}", .{ first_letter, name[1..] });
}
fn avoidReserved(snake_name: []const u8) []const u8 {
if (std.mem.eql(u8, snake_name, "error")) return "@\"error\"";
if (std.mem.eql(u8, snake_name, "return")) return "@\"return\"";
if (std.mem.eql(u8, snake_name, "not")) return "@\"not\"";
if (std.mem.eql(u8, snake_name, "and")) return "@\"and\"";
if (std.mem.eql(u8, snake_name, "or")) return "@\"or\"";
if (std.mem.eql(u8, snake_name, "test")) return "@\"test\"";
if (std.mem.eql(u8, snake_name, "null")) return "@\"null\"";
return snake_name;
}