Add async read and write files

.gitignore

@@ -1 +1,2 @@
 test/test
+test/*.txt

.vscode/settings.json

@@ -27,6 +27,7 @@
         "bitset": "cpp",
         "algorithm": "cpp",
         "string": "cpp",
-        "string_view": "cpp"
+        "string_view": "cpp",
+        "fstream": "cpp"
     }
 }

README.md

@@ -14,6 +14,7 @@ A C++ library for event-driven asynchronous multi-threaded programming.
 - Typed events (on, emit, off)
 - Event loops
 - Multiple parallel execution loops
+- Asynchronous file IO
 ## Installation
 
 Just download the latest release and unzip it into your project. 
@@ -25,6 +26,8 @@ Just download the latest release and unzip it into your project.
 #include "asynco/lib/event.hpp"     // event
 #include "asynco/lib/rotor.hpp"     // interval, timeout
 #include "asynco/lib/runner.hpp"    // for own loop
+#include "asynco/lib/filesystem.hpp"// for async read and write files
+
 using namespace marcelb;
 
 ```
@@ -224,6 +227,31 @@ myclass.on("constructed", [] (int i) {
 });
 
 ```
+
+Asynchronous file IO
+
+```c++
+string data_;
+
+asynco_read("test.txt", [&data_] (string data, exception* error) {
+    if (error) {
+        cout << "Error " << error->what() << endl;
+    } else {
+        cout << "Data " << endl << data << endl;
+        data_ = data;
+        cout << "Data_" << data_ << endl;
+    }
+});
+
+asynco_write("test1.txt", "Hello night", [] (exception* error) {
+    if (error) {
+        cout << "Error " << error->what() << endl;
+    } else {
+        cout << "Write successfuly" << endl;
+    }
+});
+```
+
 ## License
 
 [APACHE 2.0](http://www.apache.org/licenses/LICENSE-2.0/)

lib/filesystem.hpp

@@ -0,0 +1,68 @@
+#ifndef _ASYNCO_FS_
+#define _ASYNCO_FS_
+
+#include "asynco.hpp"
+
+
+#include <fstream>
+#include <iostream>
+
+using namespace std;
+
+namespace marcelb {
+
+/**
+ * Asynchronous file reading
+*/
+template<typename Callback>
+void asynco_read(string path, Callback&& callback) {
+    asynco( [&path, callback] () {
+        string content;
+        try {
+            string line;
+            ifstream file (path);
+            if (file.is_open()) {
+                line.clear();
+                while ( getline (file,line) ) {
+                    content += line + "\n";
+                }
+                file.close();
+            }
+
+            else {
+                throw runtime_error("Unable to open file"); 
+            }
+
+            callback(content, nullptr);
+        } catch(exception& error) {
+            callback(content, &error);
+        }
+    });
+}
+
+/**
+ * Asynchronous file writing
+*/
+template<typename Callback>
+void asynco_write(string path, string content, Callback&& callback) {
+    asynco( [&path, &content, callback] () {
+        try {
+            ofstream file (path);
+            if (file.is_open()) {
+                file << content;
+                file.close();
+            }
+            else {
+                throw runtime_error("Unable to open file"); 
+            }
+
+            callback(nullptr);
+        } catch(exception& error) {
+            callback(&error);
+        }
+    });
+}
+
+}
+
+#endif

test/test.cpp

@@ -1,8 +1,9 @@
 #define NUM_OF_RUNNERS 2
 
-#include "../lib/asynco.hpp"
+// #include "../lib/asynco.hpp"
-#include "../lib/event.hpp"
+// #include "../lib/event.hpp"
-#include "../lib/rotor.hpp"
+// #include "../lib/rotor.hpp"
+#include "../lib/filesystem.hpp"
 
 #include <iostream>
 #include <unistd.h>
@@ -11,29 +12,29 @@ using namespace std;
 using namespace marcelb;
 using namespace this_thread;
 
-void sleep_to (int _time) {
+// void sleep_to (int _time) {
-    promise<void> _promise;
+//     promise<void> _promise;
-    timeout t( [&]() {
+//     timeout t( [&]() {
-        _promise.set_value();
+//         _promise.set_value();
-    }, _time);
+//     }, _time);
 
-    return _promise.get_future().get();
+//     return _promise.get_future().get();
-}
+// }
 
-void promise_reject (int _time) {
+// void promise_reject (int _time) {
-    promise<void> _promise;
+//     promise<void> _promise;
-    timeout t( [&]() {
+//     timeout t( [&]() {
-        try {
+//         try {
-            // simulate except
+//             // simulate except
-            throw runtime_error("Error simulation");
+//             throw runtime_error("Error simulation");
-            _promise.set_value();
+//             _promise.set_value();
-        } catch (...) {
+//         } catch (...) {
-            _promise.set_exception(current_exception());
+//             _promise.set_exception(current_exception());
-        }
+//         }
-    }, _time);
+//     }, _time);
 
-    return _promise.get_future().get();
+//     return _promise.get_future().get();
-}
+// }
 
 void notLambdaFunction() {
     cout << "Call to not lambda function" << endl;
@@ -48,15 +49,15 @@ class clm {
 
 // ------------------ EXTEND OWN CLASS WITH EVENTS -------------------
 
-class myOwnClass : public event<int> {
+// class myOwnClass : public event<int> {
-    public:
+//     public:
-    myOwnClass() : event() {};
+//     myOwnClass() : event() {};
-};
+// };
 
 
 int main () {
 
-    auto start = rtime_ms();
+    // auto start = rtime_ms();
 
     // --------------- TIME ASYNCHRONOUS FUNCTIONS --------------
 
@@ -64,22 +65,22 @@ int main () {
      * Init interval and timeout; clear interval and timeout
     */
 
-    interval( [&] () {
+    // interval( [&] () {
-        cout << "interval "  << rtime_ms() - start << endl;
+    //     cout << "interval "  << rtime_ms() - start << endl;
-    }, 200);
+    // }, 200);
 
-    interval( [&] () {
+    // interval( [&] () {
-        cout << "interval " << rtime_ms() - start << endl;
+    //     cout << "interval " << rtime_ms() - start << endl;
-    }, 200);
+    // }, 200);
 
-    interval( [&] () {
+    // interval( [&] () {
-        cout << "interval " << rtime_ms() - start << endl;
+    //     cout << "interval " << rtime_ms() - start << endl;
-    }, 200);
+    // }, 200);
 
 
-    interval( [&] () {
+    // interval( [&] () {
-        cout << "interval "  << rtime_ms() - start << endl;
+    //     cout << "interval "  << rtime_ms() - start << endl;
-    }, 200);
+    // }, 200);
 
     // interval inter1 ([&]() {
     //     cout << "interval prvi " << rtime_ms() - start << endl;
@@ -274,6 +275,28 @@ int main () {
     //     cout << "Constructed " << i  << endl;
     // });
 
+    // string data_;
+
+    // asynco_read("test.txt", [&data_] (string data, exception* error) {
+    //     if (error) {
+    //         cout << "Error " << error->what() << endl;
+    //     } else {
+    //         cout << "Data " << endl << data << endl;
+    //         data_ = data;
+    //         cout << "Data_" << data_ << endl;
+    //     }
+    // });
+
+    // asynco_write("test1.txt", "Hello night", [] (exception* error) {
+    //     if (error) {
+    //         cout << "Error " << error->what() << endl;
+    //     } else {
+    //         cout << "Write successfuly" << endl;
+    //     }
+    // });
+
+
+    cout << "Sleep" << endl;
     sleep(100000); // only for testing
 
     return 0;