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// Jsonrpc (client) implementation header
// Copyright (C) 2022 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
// See: https://www.jsonrpc.org/specification
#ifndef JSONRPC_H
#define JSONRPC_H
#include <string>
#include <iostream>
#include <unistd.h>
#include "config.h"
#include "stdint.h"
#if HAVE_JSON_C
#include <json-c/json.h>
#else
struct json_object;
enum json_type {json_type_null, json_type_string};
#define JSON_C_TO_STRING_SPACED 1
json_object* json_tokener_parse(const char*);
json_object* json_object_new_object();
json_object* json_object_new_string(const char*);
json_object* json_object_new_int(int32_t);
json_object* json_object_new_boolean(bool);
json_object* json_object_new_double(double);
const char* json_object_get_string(json_object*);
int32_t json_object_get_int(json_object*);
bool json_object_get_boolean(json_object*);
uint64_t json_object_get_uint64(json_object*);
double json_object_get_double(json_object*);
bool json_object_object_get_ex (json_object*,const char*, json_object**);
json_type json_object_get_type (json_object*);
int json_object_object_add(json_object*, const char*, json_object*);
size_t json_object_array_length(json_object*);
json_object* json_object_array_get_idx(json_object*, size_t);
const char* json_object_to_json_string_length(json_object*, int, size_t*);
const char* json_object_to_json_string(json_object*);
json_object* json_object_new_array();
void json_object_array_add(json_object*, json_object*);
#endif
using namespace std;
static struct
{
int ParseError = -32700;
int InvalidRequest = -32600;
int MethodNotFound = -32601;
int InvalidParams = -32602;
int InternalError = -32603;
int ServerNotInitialized = -32002;
int UnknownErrorCode = -32001;
} LSPErrCode;
struct jsonrpc_error : public runtime_error
{
private:
json_object *error;
public:
jsonrpc_error(int code, string message, json_object *data = NULL) : runtime_error(to_string(code) + "-" + message)
{
error = json_object_new_object();
json_object_object_add(error, "code", json_object_new_int(code));
json_object_object_add(error, "message", json_object_new_string(message.c_str()));
if (data)
json_object_object_add(error, "data", data);
}
json_object *get_json() { return error; }
};
struct jsonrpc_header
{
size_t content_length;
string content_type;
jsonrpc_header() : content_length{0}, content_type{"application/vscode-jsonrpc; charset=utf-8"}
{}
};
struct jsonrpc_request
{
string jsonrpc;
string method;
json_object *params;
int id;
bool id_is_string; // true iff the original id was sent as "id"
bool is_notification()
{
return id == -1;
}
jsonrpc_request(char *request_string)
{
json_object *request = json_tokener_parse(request_string);
json_object* value;
if (request)
{
if(json_object_object_get_ex(request, "jsonrpc", &value))
jsonrpc = json_object_get_string(value);
if(json_object_object_get_ex(request, "method", &value))
method = json_object_get_string(value);
if(json_object_object_get_ex(request, "params", &value))
params = value;
json_object *jid;
bool has_jid = json_object_object_get_ex(request, "id", &jid);
if (!has_jid || json_object_get_type(jid) == json_type_null)
id = -1;
else if (json_object_get_type(jid) == json_type_string){
id = atoi(json_object_get_string(jid));
id_is_string = true;
}
else{
id = json_object_get_int(jid);
id_is_string = false;
}
}
if (!request || jsonrpc != "2.0")
throw jsonrpc_error(LSPErrCode.InvalidRequest, "");
}
};
struct jsonrpc_response
{
private:
json_object *payload;
public:
bool result_or_error_set;
jsonrpc_response()
{
payload = json_object_new_object();
json_object_object_add(payload, "jsonrpc", json_object_new_string("2.0"));
result_or_error_set = false;
}
bool set_error(json_object *e)
{
if (result_or_error_set)
return false;
json_object_object_add(payload, "error", e);
result_or_error_set = true;
return true;
}
bool set_result(json_object *r)
{
if (result_or_error_set)
return false;
json_object_object_add(payload, "result", r);
result_or_error_set = true;
return true;
}
json_object *to_json(jsonrpc_request *req)
{
if (!result_or_error_set)
throw jsonrpc_error(LSPErrCode.InternalError, "Either result or error must be set on a json response");
// If there was an error in detecting the id in the Request object (e.g. Parse error/Invalid Request), it MUST be Null.
if (req->id_is_string)
{
string id = to_string(req->id);
json_object_object_add(payload, "id", req->id >= 0 ? json_object_new_string(id.c_str()) : NULL);
}else{
int id = req->id;
json_object_object_add(payload, "id", req->id >= 0 ? json_object_new_int(id) : NULL);
}
return payload;
}
};
class jsonrpc_connection
{
private:
int IN_FILNO;
int OUT_FILENO;
int verbose;
bool _read_header_line(string &line);
void _read_header(jsonrpc_header &h);
void _write_header_line(string field, string value, bool final_line = false);
public:
jsonrpc_connection(int in_fd, int out_fd, int verbose) : IN_FILNO{in_fd}, OUT_FILENO{out_fd}, verbose{verbose}
{
// The in file-descriptor is a terminal
if(1 == isatty(IN_FILNO)){
cerr << "Warning: The language server should not be started in a terminal.\n" \
<< "It should be run as the child of a LSP client" << endl;
exit(1);
}
}
// Client functions
void wait_for_request();
jsonrpc_request *get_request();
void send_response(jsonrpc_request *request, jsonrpc_response *response);
// TODO: Server functions send request/notification (needed only for completeness, not required)
};
#endif
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