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* Exports create file system module function.
*
* @module
*/
import type { ReleaseLock } from '@agogpixel/pgmmv-resource-support/src/locks/release-lock.type';
import { createResourceLocksManager } from '@agogpixel/pgmmv-resource-support/src/locks/create-resource-locks-manager.function';
import { getModule } from '@agogpixel/pgmmv-resource-support/src/module/get-module.function';
import { hasModule } from '@agogpixel/pgmmv-resource-support/src/module/has-module.function';
import { setModule } from '@agogpixel/pgmmv-resource-support/src/module/set-module.function';
import { pollWithInterval } from '@agogpixel/pgmmv-resource-support/src/time/poll-with-interval.function';
import type { FileSystemOperationUnion } from './operations';
import {
appendFileOperation,
createDirectoryOperation,
ExclusiveFileSystemOperationType,
readFileOperation,
readFileSizeOperation,
removeDirectoryOperation,
removeFileOperation,
renameFileOperation,
SharedFileSystemOperationType,
writeFileOperation
} from './operations';
import type { FileSystemModule } from './file-system-module.type';
////////////////////////////////////////////////////////////////////////////////
// Public Static Properties
////////////////////////////////////////////////////////////////////////////////
// None.
////////////////////////////////////////////////////////////////////////////////
// Private Static Properties
////////////////////////////////////////////////////////////////////////////////
/**
* File system module key.
*
* @private
* @static
*/
const fsModuleKey = 'fs';
/**
* Number of shared locks per file system resource.
*
* @private
* @static
*/
const numSharedLocks = 2;
////////////////////////////////////////////////////////////////////////////////
// Public Static Methods
////////////////////////////////////////////////////////////////////////////////
/**
* Create file system module.
*
* @returns File system module global singleton.
*/
export function createFileSystemModule() {
// Public API container.
const self = {} as FileSystemModule;
// Singleton.
if (hasModule(fsModuleKey)) {
return getModule(fsModuleKey) as FileSystemModule;
} else Iif (!setModule(fsModuleKey, self)) {
return undefined;
}
//////////////////////////////////////////////////////////////////////////////
// Private Properties
//////////////////////////////////////////////////////////////////////////////
/**
* File system resource operation queues.
*
* @private
*/
const operationQueues: Record<string, FileSystemOperationUnion[]> = {};
/**
* File system resource locks manager.
*
* @private
*/
const locksManager = createResourceLocksManager();
//////////////////////////////////////////////////////////////////////////////
// Private Methods
//////////////////////////////////////////////////////////////////////////////
/**
* Enqueue a file system operation.
*
* @param operation File system operation.
* @private
*/
function enqueueOperation(operation: FileSystemOperationUnion) {
const path =
operation.type === ExclusiveFileSystemOperationType.RenameFile
? `${operation.payload.dirPath}/${operation.payload.oldName}`
: operation.payload.path;
Iif (!locksManager.hasLocks(path)) {
locksManager.createLocks({ key: path, numSharedLocks, exclusiveLock: true });
}
Iif (!operationQueues[path]) {
operationQueues[path] = [];
}
operationQueues[path].push(operation);
}
/**
* Dequeue a file system operation for specified path.
*
* @param path File system path.
* @returns File system operation or `undefined`.
* @private
*/
function dequeueOperation(path: string) {
Iif (!operationQueues[path] || !operationQueues[path].length) {
return;
}
const operation = operationQueues[path].shift();
Iif (!operationQueues[path].length) {
locksManager.destroyLocks(path);
delete operationQueues[path];
}
return operation;
}
/**
* Peek next file system operation type in the queue for specified path.
*
* @param path File system path.
* @returns File system operation type of `undefined`.
* @private
*/
function peekOperationType(path: string) {
Iif (!operationQueues[path] || !operationQueues[path].length) {
return;
}
return operationQueues[path][0].type;
}
/**
* Poll file system operation queues.
*
* @returns False to ensure continuous polling.
* @private
*/
function pollOperationQueues(): false {
const paths = Object.keys(operationQueues);
for (const path of paths) {
Iif (!operationQueues[path] || !operationQueues[path].length) {
continue;
}
const operationType = peekOperationType(path);
let releaseLock: ReleaseLock | undefined;
switch (operationType) {
case ExclusiveFileSystemOperationType.AppendFile:
case ExclusiveFileSystemOperationType.RemoveFile:
case ExclusiveFileSystemOperationType.RenameFile:
case ExclusiveFileSystemOperationType.WriteFile:
case ExclusiveFileSystemOperationType.CreateDirectory:
case ExclusiveFileSystemOperationType.RemoveDirectory:
releaseLock = locksManager.acquireExclusiveLock(path);
break;
case SharedFileSystemOperationType.ReadFile:
case SharedFileSystemOperationType.ReadFileSize:
releaseLock = locksManager.acquireSharedLock(path);
break;
}
Iif (!releaseLock) {
continue;
}
const operation = dequeueOperation(path) as FileSystemOperationUnion;
switch (operation.type) {
case ExclusiveFileSystemOperationType.WriteFile:
writeFileOperation(operation.payload, releaseLock);
break;
case ExclusiveFileSystemOperationType.AppendFile:
appendFileOperation(operation.payload, releaseLock);
break;
case ExclusiveFileSystemOperationType.RenameFile:
renameFileOperation(operation.payload, releaseLock);
break;
case ExclusiveFileSystemOperationType.RemoveFile:
removeFileOperation(operation.payload, releaseLock);
break;
case ExclusiveFileSystemOperationType.CreateDirectory:
createDirectoryOperation(operation.payload, releaseLock);
break;
case ExclusiveFileSystemOperationType.RemoveDirectory:
removeDirectoryOperation(operation.payload, releaseLock);
break;
case SharedFileSystemOperationType.ReadFile:
readFileOperation(operation.payload, releaseLock);
break;
case SharedFileSystemOperationType.ReadFileSize:
readFileSizeOperation(operation.payload, releaseLock);
break;
}
}
return false;
}
//////////////////////////////////////////////////////////////////////////////
// Protected Properties
//////////////////////////////////////////////////////////////////////////////
// None.
//////////////////////////////////////////////////////////////////////////////
// Protected Methods
//////////////////////////////////////////////////////////////////////////////
// None.
//////////////////////////////////////////////////////////////////////////////
// Public Properties
//////////////////////////////////////////////////////////////////////////////
// None.
//////////////////////////////////////////////////////////////////////////////
// Public Methods
//////////////////////////////////////////////////////////////////////////////
self.createDirectory = function (path, callback) {
enqueueOperation({
type: ExclusiveFileSystemOperationType.CreateDirectory,
payload: {
path,
callback
}
});
return self;
};
self.isAbsolutePath = function (path) {
return jsb.fileUtils.isAbsolutePath(path);
};
self.isDirectory = function (path) {
return jsb.fileUtils.isDirectoryExist(path);
};
self.isFile = function (path) {
return jsb.fileUtils.isFileExist(path);
};
self.removeDirectory = function (path, callback) {
enqueueOperation({
type: ExclusiveFileSystemOperationType.RemoveDirectory,
payload: {
path,
callback
}
});
return self;
};
self.removeFile = function (path, callback) {
enqueueOperation({
type: ExclusiveFileSystemOperationType.RemoveFile,
payload: {
path,
callback
}
});
return self;
};
self.renameFile = function (dirPath, oldName, newName, callback) {
enqueueOperation({
type: ExclusiveFileSystemOperationType.RenameFile,
payload: {
dirPath,
oldName,
newName,
callback
}
});
return self;
};
self.readFile = function (path, callback) {
enqueueOperation({
type: SharedFileSystemOperationType.ReadFile,
payload: {
path,
callback
}
});
return self;
};
self.readFileSize = function (path, callback) {
enqueueOperation({
type: SharedFileSystemOperationType.ReadFileSize,
payload: {
path,
callback
}
});
return self;
};
self.writeFile = function (dataStr, path, callback) {
enqueueOperation({
type: ExclusiveFileSystemOperationType.WriteFile,
payload: {
data: dataStr,
path,
callback
}
});
return self;
};
self.appendFile = function (dataStr, path, callback) {
enqueueOperation({
type: ExclusiveFileSystemOperationType.AppendFile,
payload: {
data: dataStr,
path,
callback
}
});
return self;
};
// Poll indefinitely.
pollWithInterval(
pollOperationQueues,
function () {
return;
},
function () {
return;
},
500
);
// Module is ready!
return self;
}
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