Version: Next

Rest API

1. Start REST Service

The RestAPI service can be started in the following ways:

python3 -m pip install kclvm -U
python3 -m gunicorn "kclvm.program.rpc-server.__main__:create_app()" -t 120 -w 4 -k uvicorn.workers.UvicornWorker -b :2021

go install kcl-lang.io/kcl-go/cmds/kcl-go@main
kcl-go rest-server

The service can then be requested via the POST protocol:

$ curl -X POST http://127.0.0.1:2021/api:protorpc/BuiltinService.Ping --data '{}'
{
    "error": "",
    "result": {}
}

The POST request and the returned JSON data are consistent with the structure defined by Protobuf.

2. `BuiltinService`

Where the /api:protorpc/BuiltinService.Ping path represents the Ping method of the BuiltinService service.

The complete BuiltinService is defined by Protobuf:

service BuiltinService {
    rpc Ping(Ping_Args) returns(Ping_Result);
    rpc ListMethod(ListMethod_Args) returns(ListMethod_Result);
}

message Ping_Args {
    string value = 1;
}
message Ping_Result {
    string value = 1;
}

message ListMethod_Args {
    // empty
}
message ListMethod_Result {
    repeated string method_name_list = 1;
}

The Ping method can verify whether the service is normal, and the ListMethod method can query the list of all services and functions provided.

3. `KclvmService`

The KclvmService service is a service related to KCL functionality. The usage is the same as the BuiltinService service.

For example, there is the following Person structure definition:

schema Person:
    key: str

    check:
        "value" in key  # 'key' is required and 'key' must contain "value"

Then we want to use Person to verify the following JSON data:

{"key": "value"}

This can be done through the ValidateCode method of the KclvmService service. Refer to the ValidateCode_Args structure of the ValidateCode method:

message ValidateCode_Args {
    string data = 1;
    string code = 2;
    string schema = 3;
    string attribute_name = 4;
    string format = 5;
}

Construct the JSON data required by the POST request according to the ValidateCode_Args structure, which contains the Person definition and the JSON data to be verified:

{
    "code": "\nschema Person:\n    key: str\n\n    check:\n        \"value\" in key  # 'key' is required and 'key' must contain \"value\"\n",
    "data": "{\"key\": \"value\"}"
}

Save this JSON data to the vet-hello.json file and verify it with the following command:

$ curl -X POST \
    http://127.0.0.1:2021/api:protorpc/KclvmService.ValidateCode \
    -H  "accept: application/json" \
    --data @./vet-hello.json
{
    "error": "",
    "result": {
        "success": true
    }
}

4. Complete Protobuf Service Definition

Cross-language APIs defined via Protobuf(https://github.com/kcl-lang/kcl-go/blob/main/pkg/spec/gpyrpc/gpyrpc.proto):

// Copyright 2023 The KCL Authors. All rights reserved.
//
// This file defines the request parameters and return structure of the KCL RPC server.
// We can use the following command to start a KCL RPC server.

syntax = "proto3";

package gpyrpc;

import "google/protobuf/any.proto";
import "google/protobuf/descriptor.proto";

// ----------------------------------------------------------------------------

// kcl main.k -D name=value
message CmdArgSpec {
    string name = 1;
    string value = 2;
}

// kcl main.k -O pkgpath:path.to.field=field_value
message CmdOverrideSpec {
    string pkgpath = 1;
    string field_path = 2;
    string field_value = 3;
    string action = 4;
}

// ----------------------------------------------------------------------------
// gpyrpc request/response/error types
// ----------------------------------------------------------------------------

message RestResponse {
    google.protobuf.Any result = 1;
    string error = 2;
    KclError kcl_err = 3;
}

message KclError {
    string ewcode = 1; // See kclvm/kcl/error/kcl_err_msg.py
    string name = 2;
    string msg = 3;
    repeated KclErrorInfo error_infos = 4;
}

message KclErrorInfo {
    string err_level = 1;
    string arg_msg = 2;
    string filename = 3;
    string src_code = 4;
    string line_no = 5;
    string col_no = 6;
}

// ----------------------------------------------------------------------------
// service request/response
// ----------------------------------------------------------------------------

// gpyrpc.BuiltinService
service BuiltinService {
    rpc Ping(Ping_Args) returns(Ping_Result);
    rpc ListMethod(ListMethod_Args) returns(ListMethod_Result);
}

// gpyrpc.KclvmService
service KclvmService {
    rpc Ping(Ping_Args) returns(Ping_Result);

    rpc ExecProgram(ExecProgram_Args) returns(ExecProgram_Result);

    rpc FormatCode(FormatCode_Args) returns(FormatCode_Result);
    rpc FormatPath(FormatPath_Args) returns(FormatPath_Result);
    rpc LintPath(LintPath_Args) returns(LintPath_Result);
    rpc OverrideFile(OverrideFile_Args) returns (OverrideFile_Result);
    
    rpc GetSchemaType(GetSchemaType_Args) returns(GetSchemaType_Result);
    rpc GetSchemaTypeMapping(GetSchemaTypeMapping_Args) returns(GetSchemaTypeMapping_Result);
    rpc ValidateCode(ValidateCode_Args) returns(ValidateCode_Result);

    rpc ListDepFiles(ListDepFiles_Args) returns(ListDepFiles_Result);
    rpc LoadSettingsFiles(LoadSettingsFiles_Args) returns(LoadSettingsFiles_Result);
}

message Ping_Args {
    string value = 1;
}
message Ping_Result {
    string value = 1;
}

message ListMethod_Args {
    // empty
}
message ListMethod_Result {
    repeated string method_name_list = 1;
}

message ParseFile_AST_Args {
    string filename = 1;
    string source_code = 2;
}
message ParseFile_AST_Result {
    string ast_json = 1; // json value
    KclError kcl_err = 2;
}

message ParseProgram_AST_Args {
    repeated string k_filename_list = 1;
}
message ParseProgram_AST_Result {
    string ast_json = 1; // json value
    KclError kcl_err = 2;
}

message ExecProgram_Args {
    string work_dir = 1;

    repeated string k_filename_list = 2;
    repeated string k_code_list = 3;
    
    repeated CmdArgSpec args = 4;
    repeated CmdOverrideSpec overrides = 5;

    bool disable_yaml_result = 6;

    bool print_override_ast = 7;

    // -r --strict-range-check
    bool strict_range_check = 8;

    // -n --disable-none
    bool disable_none = 9;
    // -v --verbose
    int32 verbose = 10;

    // -d --debug
    int32 debug = 11;

    // yaml/json: sort keys
    bool sort_keys = 12;
    // include schema type path in JSON/YAML result
    bool include_schema_type_path = 13;
}
message ExecProgram_Result {
    string json_result = 1;
    string yaml_result = 2;

    string escaped_time = 101;
}

message ResetPlugin_Args {
    string plugin_root = 1;
}
message ResetPlugin_Result {
    // empty
}

message FormatCode_Args {
    string source = 1;
}

message FormatCode_Result {
    bytes formatted = 1;
}

message FormatPath_Args {
    string path = 1;
}

message FormatPath_Result {
    repeated string changed_paths = 1;
}

message LintPath_Args {
    repeated string paths = 1;
}

message LintPath_Result {
    repeated string results = 1;
}

message OverrideFile_Args {
    string file = 1;
    repeated string specs = 2;
    repeated string import_paths = 3;
}

message OverrideFile_Result {
    bool result = 1;
}

message EvalCode_Args {
    string code = 1;
}
message EvalCode_Result {
    string json_result = 2;
}

message ResolveCode_Args {
    string code = 1;
}

message ResolveCode_Result {
    bool success = 1;
}

message GetSchemaType_Args {
    string file = 1;
    string code = 2;
    string schema_name = 3;
}
message GetSchemaType_Result {
    repeated KclType schema_type_list = 1;
}

message GetSchemaTypeMapping_Args {
    string file = 1;
    string code = 2;
    string schema_name = 3;
}
message GetSchemaTypeMapping_Result {
    map<string, KclType> schema_type_mapping = 1;
}

message ValidateCode_Args {
    string data = 1;
    string code = 2;
    string schema = 3;
    string attribute_name = 4;
    string format = 5;
}

message ValidateCode_Result {
    bool success = 1;
    string err_message = 2;
}

message Position {
    int64 line = 1;
    int64 column = 2;
    string filename = 3;
}

message ListDepFiles_Args {
    string work_dir = 1;
    bool use_abs_path = 2;
    bool include_all = 3;
    bool use_fast_parser = 4;
}

message ListDepFiles_Result {
    string pkgroot = 1;
    string pkgpath = 2;
    repeated string files = 3;
}

// ---------------------------------------------------------------------------------
// LoadSettingsFiles API
//    Input work dir and setting files and return the merged kcl singleton config.
// ---------------------------------------------------------------------------------

message LoadSettingsFiles_Args {
    string work_dir = 1;
    repeated string files = 2;
}

message LoadSettingsFiles_Result {
    CliConfig kcl_cli_configs = 1;
    repeated KeyValuePair kcl_options = 2;
}

message CliConfig {
    repeated string files = 1;
    string output = 2;
    repeated string overrides = 3;
    repeated string path_selector = 4;
    bool strict_range_check = 5;
    bool disable_none = 6;
    int64 verbose = 7;
    bool debug = 8;
}

message KeyValuePair {
    string key = 1;
    string value = 2;
}

// ----------------------------------------------------------------------------
// JSON Schema Lit
// ----------------------------------------------------------------------------

message KclType {
    string type = 1;                     // schema, dict, list, str, int, float, bool, any, union, number_multiplier
    repeated KclType union_types = 2 ;   // union types
    string default = 3;                  // default value

    string schema_name = 4;              // schema name
    string schema_doc = 5;               // schema doc
    map<string, KclType> properties = 6; // schema properties
    repeated string required = 7;        // required schema properties, [property_name1, property_name2]

    KclType key = 8;                     // dict key type
    KclType item = 9;                    // dict/list item type

    int32 line = 10;

    repeated Decorator decorators = 11;  // schema decorators
}

message Decorator {
    string name = 1;
    repeated string arguments = 2;
    map<string, string> keywords = 3;
}

// ----------------------------------------------------------------------------
// END
// ----------------------------------------------------------------------------

Rest API

1. Start REST Service​

2. BuiltinService​

3. KclvmService​

4. Complete Protobuf Service Definition​

1. Start REST Service

2. `BuiltinService`

3. `KclvmService`

4. Complete Protobuf Service Definition