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62 lines
2.6 KiB
Objective-C
62 lines
2.6 KiB
Objective-C
/*
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* Copyright (C) 2022 by Claudio Cambra <claudio.cambra@nextcloud.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#import "LineProcessor.h"
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#ifndef LocalSocketClient_h
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#define LocalSocketClient_h
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#define BUF_SIZE 4096
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/// Class handling asynchronous communication with a server over a local UNIX socket.
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///
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/// The implementation uses a `DispatchQueue` and `DispatchSource`s to handle asynchronous communication and thread
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/// safety. The delegate that handles the line-decoding is **not invoked on the UI thread**, but the (random) thread associated
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/// with the `DispatchQueue`.
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///
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/// If any UI work needs to be done, the `LineProcessor` class dispatches this work on the main queue (so the UI thread) itself.
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///
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/// Other than the `init(withSocketPath:, lineProcessor)` and the `start()` method, all work is done "on the dispatch
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/// queue". The `localSocketQueue` is a serial dispatch queue (so a maximum of 1, and only 1, task is run at any
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/// moment), which guarantees safe access to instance variables. Both `askOnSocket(_:, query:)` and
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/// `askForIcon(_:, isDirectory:)` will internally dispatch the work on the `DispatchQueue`.
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///
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/// Sending and receiving data to and from the socket, is handled by two `DispatchSource`s. These will run an event
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/// handler when data can be read from resp. written to the socket. These handlers will also be run on the
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/// `DispatchQueue`.
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@interface LocalSocketClient : NSObject
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@property NSString* socketPath;
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@property LineProcessor* lineProcessor;
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@property int sock;
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@property dispatch_queue_t localSocketQueue;
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@property dispatch_source_t readSource;
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@property dispatch_source_t writeSource;
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@property NSMutableData* inBuffer;
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@property NSMutableData* outBuffer;
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- (instancetype)init:(NSString*)socketPath lineProcessor:(LineProcessor*)lineProcessor;
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- (BOOL)isConnected;
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- (void)start;
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- (void)restart;
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- (void)closeConnection;
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- (NSString*)strErr;
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- (void)askOnSocket:(NSString*)path query:(NSString*)verb;
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- (void)askForIcon:(NSString*)path isDirectory:(BOOL)isDirectory;
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- (void)readFromSocket;
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- (void)writeToSocket;
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- (void)processInBuffer;
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@end
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#endif /* LocalSocketClient_h */
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