1 /*
2 * Copyright (c) 2021 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "create_stream.h"
17
18 #include <memory>
19 #include <tuple>
20
21 #include "../../common/napi/n_async/n_async_work_callback.h"
22 #include "../../common/napi/n_async/n_async_work_promise.h"
23 #include "../../common/napi/n_class.h"
24 #include "../../common/napi/n_func_arg.h"
25 #include "../../common/napi/n_val.h"
26 #include "../../common/uni_error.h"
27
28 #include "../class_stream/stream_entity.h"
29 #include "../class_stream/stream_n_exporter.h"
30
31 namespace OHOS {
32 namespace DistributedFS {
33 namespace ModuleFileIO {
34 using namespace std;
35
InstantiateStream(napi_env env,unique_ptr<FILE,decltype (& fclose)> fp)36 static NVal InstantiateStream(napi_env env, unique_ptr<FILE, decltype(&fclose)> fp)
37 {
38 napi_value objStream = NClass::InstantiateClass(env, StreamNExporter::className_, {});
39 if (!objStream) {
40 UniError(EIO).ThrowErr(env, "INNER BUG. Cannot instantiate stream");
41 return NVal();
42 }
43
44 auto streamEntity = NClass::GetEntityOf<StreamEntity>(env, objStream);
45 if (!streamEntity) {
46 UniError(EIO).ThrowErr(env, "Cannot instantiate stream because of void entity");
47 return NVal();
48 }
49
50 streamEntity->fp.swap(fp);
51 return { env, objStream };
52 }
53
GetCreateStreamArgs(napi_env env,const NFuncArg & funcArg)54 static tuple<bool, string, string> GetCreateStreamArgs(napi_env env, const NFuncArg &funcArg)
55 {
56 auto [resGetFirstArg, path, unused] = NVal(env, funcArg[NARG_POS::FIRST]).ToUTF8StringPath();
57 if (!resGetFirstArg) {
58 UniError(EINVAL).ThrowErr(env, "Invalid path");
59 return { false, "", "" };
60 }
61
62 auto [resGetSecondArg, mode, useless] = NVal(env, funcArg[NARG_POS::SECOND]).ToUTF8String();
63 if (!resGetSecondArg) {
64 UniError(EINVAL).ThrowErr(env, "Invalid mode");
65 return { false, "", "" };
66 }
67
68 return { true, path.get(), mode.get() };
69 }
70
Sync(napi_env env,napi_callback_info info)71 napi_value CreateStream::Sync(napi_env env, napi_callback_info info)
72 {
73 NFuncArg funcArg(env, info);
74 if (!funcArg.InitArgs(NARG_CNT::TWO)) {
75 UniError(EINVAL).ThrowErr(env, "Number of arguments unmatched");
76 return nullptr;
77 }
78
79 auto [resGetCreateStreamArgs, argPath, argMode] = GetCreateStreamArgs(env, funcArg);
80 if (!resGetCreateStreamArgs) {
81 return nullptr;
82 }
83
84 unique_ptr<FILE, decltype(&fclose)> fp = { fopen(argPath.c_str(), argMode.c_str()), fclose };
85 if (!fp) {
86 UniError(errno).ThrowErr(env);
87 return nullptr;
88 }
89
90 return InstantiateStream(env, move(fp)).val_;
91 }
92
93 struct AsyncCreateStreamArg {
94 unique_ptr<FILE, decltype(&fclose)> fp = { nullptr, fclose };
95 };
96
Async(napi_env env,napi_callback_info info)97 napi_value CreateStream::Async(napi_env env, napi_callback_info info)
98 {
99 NFuncArg funcArg(env, info);
100 if (!funcArg.InitArgs(NARG_CNT::TWO, NARG_CNT::THREE)) {
101 UniError(EINVAL).ThrowErr(env, "Number of arguments unmatched");
102 return nullptr;
103 }
104
105 auto [resGetCreateStreamArgs, argPath, argMode] = GetCreateStreamArgs(env, funcArg);
106 if (!resGetCreateStreamArgs) {
107 return nullptr;
108 }
109
110 auto arg = make_shared<AsyncCreateStreamArg>();
111 auto cbExec = [arg, argPath = move(argPath), argMode = move(argMode)](napi_env env) -> UniError {
112 arg->fp = { fopen(argPath.c_str(), argMode.c_str()), fclose };
113 if (!arg->fp) {
114 return UniError(errno);
115 } else {
116 return UniError(ERRNO_NOERR);
117 }
118 };
119
120 auto cbCompl = [arg](napi_env env, UniError err) -> NVal {
121 if (err) {
122 return { env, err.GetNapiErr(env) };
123 }
124 return InstantiateStream(env, move(arg->fp));
125 };
126
127 const string procedureName = "FileIOCreateStream";
128 NVal thisVar(env, funcArg.GetThisVar());
129 if (funcArg.GetArgc() == NARG_CNT::TWO) {
130 return NAsyncWorkPromise(env, thisVar).Schedule(procedureName, cbExec, cbCompl).val_;
131 } else {
132 NVal cb(env, funcArg[NARG_POS::THIRD]);
133 return NAsyncWorkCallback(env, thisVar, cb).Schedule(procedureName, cbExec, cbCompl).val_;
134 }
135 }
136 } // namespace ModuleFileIO
137 } // namespace DistributedFS
138 } // namespace OHOS