WIP
This commit is contained in:
Alan Kligman
parent
2d195ff6d6
commit
19b21e10de
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@ -39,10 +39,36 @@ function create_tmp_file() {
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return fs.open('/tmp/1', 'w+');
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};
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function print_fd(fd) {
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console.log(fd);
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return fd;
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};
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function write_data(fd) {
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var data = new Uint8Array([1, 2, 3, 4]);
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return fs.write(fd, data, 0, 4);
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};
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function close_tmp_file(fd) {
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return fs.close(fd);
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};
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fs.promise.then(make_tmp_directory)
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.then(function() {
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var fd = fs.open('/tmp/1', 'w+');
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function write_data() {
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var data = new Uint8Array([1, 2, 3, 4]);
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return fs.write(fd, data, 0, 4);
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};
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fd.promise.then(write_data);
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})
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.then(create_tmp_file)
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.then(print_fd)
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.then(write_data)
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.then(function() { console.log('done'); })
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.otherwise(function(error) { console.error(error, error.message); });
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.otherwise(function(error) { console.error(error, error.message, error.stack); });
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});
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</script>
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@ -2,6 +2,12 @@ var write_buffer = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
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var read_buffer = new Uint8Array(16);
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var fs = new FileSystem('local');
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fs.mkdir('/tmp');
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fs.open('/tmp/', 'w+', function(error, fd) {
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if(error) return console.error(error);
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fs.write(fd, ...);
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fs.read(fd, ...);
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});
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fs.then(
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function() {
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@ -1,16 +0,0 @@
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define(function(require) {
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function Descriptor(db, id, flags, mode, size) {
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this.db = db;
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this.id = id;
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this.flags = flags;
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this.mode = mode;
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this.size = size || 0;
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this.position = 0;
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};
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return {
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Descriptor: Descriptor
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}
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});
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192
src/directory.js
192
src/directory.js
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@ -1,192 +0,0 @@
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define(function(require) {
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var read_object = require('src/object-store').read_object;
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var write_object = require('src/object-store').write_object;
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var delete_object = require('src/object-store').delete_object;
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var find_node = require('src/object-store').find_node;
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var ENoEntry = require('src/error').ENoEntry;
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var ENotDirectory = require('src/error').ENotDirectory;
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var EExists = require('src/error').EExists;
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var MODE_FILE = require('src/constants').MODE_FILE;
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var MODE_DIRECTORY = require('src/constants').MODE_DIRECTORY;
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var ROOT_DIRECTORY_NAME = require('src/constants').ROOT_DIRECTORY_NAME;
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var ROOT_NODE_ID = require('src/constants').ROOT_NODE_ID;
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var Node = require('src/file').Node;
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var DirectoryEntry = require('src/file').DirectoryEntry;
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var normalize = require('src/path').normalize;
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var dirname = require('src/path').dirname;
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var basename = require('src/path').basename;
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// Note: this should only be invoked when formatting a new file system
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function make_root_directory(objectStore, callback) {
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var directoryNode;
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var directoryData;
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function write_directory_node(error, existingNode) {
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if(!error && existingNode) {
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callback(new EExists());
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} else if(error && !error instanceof ENoEntry) {
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callback(error);
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} else {
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directoryNode = new Node(ROOT_NODE_ID, MODE_DIRECTORY);
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directoryNode.links += 1;
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write_object(objectStore, directoryNode, directoryNode.id, write_directory_data);
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}
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};
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function write_directory_data(error) {
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if(error) {
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callback(error);
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} else {
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directoryData = {};
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write_object(objectStore, directoryData, directoryNode.data, callback);
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}
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};
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find_node(objectStore, ROOT_DIRECTORY_NAME, write_directory_node);
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}
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function make_directory(objectStore, path, callback) {
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path = normalize(path);
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var name = basename(path);
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var parentPath = dirname(path);
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var directoryNode;
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var directoryData;
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var parentDirectoryNode;
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var parentDirectoryData;
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function check_if_directory_exists(error, result) {
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if(!error && result) {
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callback(new EExists());
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} else if(error && !error instanceof ENoEntry) {
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callback(error);
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} else {
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find_node(objectStore, parentPath, read_parent_directory_data);
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}
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}
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function read_parent_directory_data(error, result) {
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if(error) {
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callback(error);
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} else {
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parentDirectoryNode = result;
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read_object(objectStore, parentDirectoryNode.data, write_directory_node);
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}
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};
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function write_directory_node(error, result) {
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if(error) {
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callback(error);
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} else {
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parentDirectoryData = result;
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directoryNode = new Node(undefined, MODE_DIRECTORY);
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directoryNode.links += 1;
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write_object(objectStore, directoryNode, directoryNode.id, write_directory_data);
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}
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};
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function write_directory_data(error) {
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if(error) {
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callback(error);
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} else {
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directoryData = {};
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write_object(objectStore, directoryData, directoryNode.data, update_parent_directory_data);
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}
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};
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function update_parent_directory_data(error) {
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if(error) {
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callback(error);
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} else {
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parentDirectoryData[name] = new DirectoryEntry(directoryNode.id, MODE_DIRECTORY);
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write_object(objectStore, parentDirectoryData, parentDirectoryNode.data, callback);
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}
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}
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find_node(objectStore, path, check_if_directory_exists);
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};
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function remove_directory(objectStore, path, callback) {
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path = normalize(path);
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var name = basename(path);
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var parentPath = dirname(path);
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var directoryNode;
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var directoryData;
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var parentDirectoryNode;
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var parentDirectoryData;
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function check_if_directory_exists(error, result) {
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if(error) {
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callback(error);
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} else if(!result) {
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callback(new ENoEntry());
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} else {
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directoryNode = result;
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read_object(objectStore, directoryNode.data, check_if_directory_is_empty);
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}
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}
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function check_if_directory_is_empty(error, result) {
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if(error) {
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callback(error);
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} else {
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directoryData = result;
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if(_(directoryData).size() > 0) {
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callback(new ENotEmpty());
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} else {
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find_node(objectStore, parentPath, read_parent_directory_data);
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}
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}
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};
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function read_parent_directory_data(error, result) {
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if(error) {
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callback(error);
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} else {
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parentDirectoryNode = result;
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read_object(objectStore, parentDirectoryNode.data, remove_directory_entry_from_parent_directory_node);
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}
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};
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function remove_directory_entry_from_parent_directory_node(error, result) {
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if(error) {
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callback(error);
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} else {
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parentDirectoryData = result;
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delete parentDirectoryData[name];
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write_object(objectStore, parentDirectoryData, parentDirectoryNode.data, remove_directory_node);
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}
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};
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function remove_directory_node(error) {
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if(error) {
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callback(error);
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} else {
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delete_object(objectStore, directoryNode.id, remove_directory_data);
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}
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};
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function remove_directory_data(error) {
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if(error) {
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callback(error);
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} else {
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delete_object(objectStore, directoryNode.data, callback);
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}
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};
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find_node(objectStore, path, check_if_directory_exists);
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};
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return {
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make_directory: make_directory,
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make_root_directory: make_root_directory,
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remove_directory: remove_directory,
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};
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});
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@ -5,6 +5,10 @@ define(function(require) {
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var _ = require('lodash');
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var when = require('when');
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var normalize = require('src/path').normalize;
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var dirname = require('src/path').dirname;
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var basename = require('src/path').basename;
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var guid = require('src/shared').guid;
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var hash = require('src/shared').hash;
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var nop = require('src/shared').nop;
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@ -19,9 +23,13 @@ define(function(require) {
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var ENotImplemented = require('src/error').ENotImplemented;
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var ENotMounted = require('src/error').ENotMounted;
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var EInvalid = require('src/error').EInvalid;
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var EIO = require('src/error').EIO;
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var FS_FORMAT = require('src/constants').FS_FORMAT;
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var MODE_FILE = require('src/constants').MODE_FILE;
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var MODE_DIRECTORY = require('src/constants').MODE_DIRECTORY;
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var ROOT_DIRECTORY_NAME = require('src/constants').ROOT_DIRECTORY_NAME;
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var ROOT_NODE_ID = require('src/constants').ROOT_NODE_ID;
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var IDB_RW = require('src/constants').IDB_RW;
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var IDB_RO = require('src/constants').IDB_RO;
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var FILE_STORE_NAME = require('src/constants').FILE_STORE_NAME;
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@ -29,12 +37,506 @@ define(function(require) {
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var FS_READY = require('src/constants').READY;
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var FS_PENDING = require('src/constants').FS_PENDING;
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var FS_ERROR = require('src/constants').FS_ERROR;
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var O_READ = require('src/constants').O_READ;
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var O_WRITE = require('src/constants').O_WRITE;
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var O_CREATE = require('src/constants').O_CREATE;
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var O_EXCLUSIVE = require('src/constants').O_EXCLUSIVE;
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var O_TRUNCATE = require('src/constants').O_TRUNCATE;
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var O_APPEND = require('src/constants').O_APPEND;
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var O_FLAGS = require('src/constants').O_FLAGS;
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var make_root_directory = require('src/directory').make_root_directory;
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var make_directory = require('src/directory').make_directory;
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var remove_directory = require('src/directory').remove_directory;
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/*
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* DirectoryEntry
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*/
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var open_file = require('src/file').open_file;
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function DirectoryEntry(id, type) {
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this.id = id;
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this.type = type || MODE_FILE;
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};
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/*
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* OpenFileDescription
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*/
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function OpenFileDescription(id, flags, position) {
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this.id = id;
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this.flags = flags;
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this.position = position;
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};
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/*
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* Node
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*/
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function Node(id, mode, size, atime, ctime, mtime, flags, xattrs, nlinks, version) {
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var now = Date.now();
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this.id = id || hash(guid()),
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this.mode = mode || MODE_FILE; // node type (file, directory, etc)
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this.size = size || 0; // size (bytes for files, entries for directories)
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this.atime = atime || now; // access time
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this.ctime = ctime || now; // creation time
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this.mtime = mtime || now; // modified time
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this.flags = flags || []; // file flags
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this.xattrs = xattrs || {}; // extended attributes
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this.nlinks = nlinks || 0; // links count
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this.version = version || 0; // node version
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this.data = hash(guid()) // id for data object
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};
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/*
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* find_node
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*/
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// in: file or directory path
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// out: node structure, or error
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function find_node(objectStore, path, callback) {
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path = normalize(path);
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if(!path) {
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return callback(new ENoEntry('path is an empty string'));
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}
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var name = basename(path);
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if(ROOT_DIRECTORY_NAME == name) {
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function check_root_directory_node(error, rootDirectoryNode) {
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if(error) {
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callback(error);
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} else if(!rootDirectoryNode) {
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callback(new ENoEntry('path does not exist'));
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} else {
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callback(undefined, rootDirectoryNode);
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}
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};
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read_object(objectStore, ROOT_NODE_ID, check_root_directory_node);
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} else {
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// in: parent directory node
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// out: parent directory data
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function read_parent_directory_data(error, parentDirectoryNode) {
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if(error) {
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callback(error);
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} else if(!_(parentDirectoryNode).has('data') || !parentDirectoryNode.type == MODE_DIRECTORY) {
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callback(new ENotDirectory('a component of the path prefix is not a directory'));
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} else {
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read_object(objectStore, parentDirectoryNode.data, get_node_id_from_parent_directory_data);
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}
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};
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// in: parent directory data
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// out: searched node id
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function get_node_id_from_parent_directory_data(error, parentDirectoryData) {
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if(error) {
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callback(error);
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} else {
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if(!_(parentDirectoryData).has(name)) {
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callback(new ENoEntry('path does not exist'));
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} else {
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var nodeId = parentDirectoryData[name].id;
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read_object(objectStore, nodeId, callback);
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}
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}
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};
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var parentPath = dirname(path);
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find_node(objectStore, parentPath, read_parent_directory_data);
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}
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};
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/*
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* read_object
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*/
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function read_object(objectStore, id, callback) {
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var getRequest = objectStore.get(id);
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getRequest.onsuccess = function onsuccess(event) {
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var result = event.target.result;
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callback(undefined, result);
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};
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getRequest.onerror = function onerror(error) {
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callback(error);
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};
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};
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/*
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* write_object
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*/
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function write_object(objectStore, object, id, callback) {
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var putRequest = objectStore.put(object, id);
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putRequest.onsuccess = function onsuccess(event) {
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var result = event.target.result;
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callback(undefined, result);
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};
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putRequest.onerror = function onerror(error) {
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callback(error);
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};
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};
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/*
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* delete_object
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*/
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function delete_object(objectStore, id, callback) {
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var deleteRequest = objectStore.delete(id);
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deleteRequest.onsuccess = function onsuccess(event) {
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var result = event.target.result;
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callback(undefined, result);
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};
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deleteRequest.onerror = function(error) {
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callback(error);
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};
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};
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/*
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* make_root_directory
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*/
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// Note: this should only be invoked when formatting a new file system
|
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function make_root_directory(objectStore, callback) {
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var directoryNode;
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var directoryData;
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function write_directory_node(error, existingNode) {
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if(!error && existingNode) {
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callback(new EExists());
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} else if(error && !error instanceof ENoEntry) {
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callback(error);
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} else {
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directoryNode = new Node(ROOT_NODE_ID, MODE_DIRECTORY);
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directoryNode.nlinks += 1;
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write_object(objectStore, directoryNode, directoryNode.id, write_directory_data);
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}
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};
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function write_directory_data(error) {
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if(error) {
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callback(error);
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} else {
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directoryData = {};
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write_object(objectStore, directoryData, directoryNode.data, callback);
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}
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};
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find_node(objectStore, ROOT_DIRECTORY_NAME, write_directory_node);
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};
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/*
|
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* make_directory
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*/
|
||||
|
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function make_directory(objectStore, path, callback) {
|
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path = normalize(path);
|
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var name = basename(path);
|
||||
var parentPath = dirname(path);
|
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|
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var directoryNode;
|
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var directoryData;
|
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var parentDirectoryNode;
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var parentDirectoryData;
|
||||
|
||||
function check_if_directory_exists(error, result) {
|
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if(!error && result) {
|
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callback(new EExists());
|
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} else if(error && !error instanceof ENoEntry) {
|
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callback(error);
|
||||
} else {
|
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find_node(objectStore, parentPath, read_parent_directory_data);
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}
|
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}
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function read_parent_directory_data(error, result) {
|
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if(error) {
|
||||
callback(error);
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} else {
|
||||
parentDirectoryNode = result;
|
||||
read_object(objectStore, parentDirectoryNode.data, write_directory_node);
|
||||
}
|
||||
};
|
||||
|
||||
function write_directory_node(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
parentDirectoryData = result;
|
||||
directoryNode = new Node(undefined, MODE_DIRECTORY);
|
||||
directoryNode.nlinks += 1;
|
||||
write_object(objectStore, directoryNode, directoryNode.id, write_directory_data);
|
||||
}
|
||||
};
|
||||
|
||||
function write_directory_data(error) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
directoryData = {};
|
||||
write_object(objectStore, directoryData, directoryNode.data, update_parent_directory_data);
|
||||
}
|
||||
};
|
||||
|
||||
function update_parent_directory_data(error) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
parentDirectoryData[name] = new DirectoryEntry(directoryNode.id, MODE_DIRECTORY);
|
||||
write_object(objectStore, parentDirectoryData, parentDirectoryNode.data, callback);
|
||||
}
|
||||
}
|
||||
|
||||
find_node(objectStore, path, check_if_directory_exists);
|
||||
};
|
||||
|
||||
/*
|
||||
* remove_directory
|
||||
*/
|
||||
|
||||
function remove_directory(objectStore, path, callback) {
|
||||
path = normalize(path);
|
||||
var name = basename(path);
|
||||
var parentPath = dirname(path);
|
||||
|
||||
var directoryNode;
|
||||
var directoryData;
|
||||
var parentDirectoryNode;
|
||||
var parentDirectoryData;
|
||||
|
||||
function check_if_directory_exists(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else if(!result) {
|
||||
callback(new ENoEntry());
|
||||
} else {
|
||||
directoryNode = result;
|
||||
read_object(objectStore, directoryNode.data, check_if_directory_is_empty);
|
||||
}
|
||||
}
|
||||
|
||||
function check_if_directory_is_empty(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
directoryData = result;
|
||||
if(_(directoryData).size() > 0) {
|
||||
callback(new ENotEmpty());
|
||||
} else {
|
||||
find_node(objectStore, parentPath, read_parent_directory_data);
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
function read_parent_directory_data(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
parentDirectoryNode = result;
|
||||
read_object(objectStore, parentDirectoryNode.data, remove_directory_entry_from_parent_directory_node);
|
||||
}
|
||||
};
|
||||
|
||||
function remove_directory_entry_from_parent_directory_node(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
parentDirectoryData = result;
|
||||
delete parentDirectoryData[name];
|
||||
write_object(objectStore, parentDirectoryData, parentDirectoryNode.data, remove_directory_node);
|
||||
}
|
||||
};
|
||||
|
||||
function remove_directory_node(error) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
delete_object(objectStore, directoryNode.id, remove_directory_data);
|
||||
}
|
||||
};
|
||||
|
||||
function remove_directory_data(error) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
delete_object(objectStore, directoryNode.data, callback);
|
||||
}
|
||||
};
|
||||
|
||||
find_node(objectStore, path, check_if_directory_exists);
|
||||
};
|
||||
|
||||
function open_file(fs, objectStore, path, flags, callback) {
|
||||
path = normalize(path);
|
||||
var name = basename(path);
|
||||
var parentPath = dirname(path);
|
||||
|
||||
var directoryNode;
|
||||
var directoryData;
|
||||
var directoryEntry;
|
||||
var fileNode;
|
||||
var fileData;
|
||||
|
||||
find_node(objectStore, parentPath, read_directory_data);
|
||||
|
||||
function read_directory_data(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
directoryNode = result;
|
||||
read_object(objectStore, directoryNode.data, check_if_file_exists);
|
||||
}
|
||||
};
|
||||
|
||||
function check_if_file_exists(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
directoryData = result;
|
||||
if(_(directoryData).has(name)) {
|
||||
if(_(flags).contains(O_EXCLUSIVE)) {
|
||||
callback(new ENoEntry('O_CREATE and O_EXCLUSIVE are set, and the named file exists'))
|
||||
} else {
|
||||
directoryEntry = directoryData[name];
|
||||
if(directoryEntry.type == MODE_DIRECTORY) {
|
||||
callback(new EIsDirectory('the named file is a directory and O_WRITE is set'))
|
||||
} else {
|
||||
read_object(objectStore, directoryEntry.id, set_file_node);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
if(!_(flags).contains(O_CREATE)) {
|
||||
callback(new ENoEntry('O_CREATE is not set and the named file does not exist'));
|
||||
} else {
|
||||
write_file_node();
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
function set_file_node(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
fileNode = result;
|
||||
callback(undefined, fileNode);
|
||||
}
|
||||
};
|
||||
|
||||
function write_file_node() {
|
||||
fileNode = new Node(undefined, MODE_FILE);
|
||||
fileNode.nlinks += 1;
|
||||
write_object(objectStore, fileNode, fileNode.id, write_file_data);
|
||||
};
|
||||
|
||||
function write_file_data(error) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
fileData = {};
|
||||
write_object(objectStore, fileData, fileNode.data, update_directory_data);
|
||||
}
|
||||
};
|
||||
|
||||
function update_directory_data(error) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
directoryData[name] = new DirectoryEntry(fileNode.id, MODE_FILE);
|
||||
write_object(objectStore, directoryData, directoryNode.data, handle_update_result);
|
||||
}
|
||||
};
|
||||
|
||||
function handle_update_result(error) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
callback(undefined, fileNode);
|
||||
}
|
||||
};
|
||||
};
|
||||
|
||||
function write_data(objectStore, ofd, buffer, offset, length, position, callback) {
|
||||
var fileNode;
|
||||
var fileData;
|
||||
|
||||
read_object(objectStore, ofd.id, read_file_data);
|
||||
|
||||
function read_file_data(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
fileNode = result;
|
||||
read_object(objectStore, fileNode.data, update_file_data);
|
||||
}
|
||||
};
|
||||
|
||||
function update_file_data(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
fileData = result;
|
||||
var _position = (undefined !== position) ? position : ofd.position;
|
||||
var newSize = Math.max(fileData.length, _position + length);
|
||||
var newData = new Uint8Array(newSize);
|
||||
if(fileData) {
|
||||
newData.set(fileData);
|
||||
}
|
||||
newData.set(buffer, _position);
|
||||
if(undefined === position) {
|
||||
ofd.position += length;
|
||||
}
|
||||
|
||||
fileNode.size = newSize;
|
||||
fileNode.mtime = Date.now();
|
||||
fileNode.version += 1;
|
||||
|
||||
write_object(objectStore, fileNode.data, update_file_node);
|
||||
}
|
||||
};
|
||||
|
||||
function update_file_node(error) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
write_object(objectStore, fileNode.id, return_nbytes);
|
||||
}
|
||||
};
|
||||
|
||||
function return_nbytes(error) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
callback(undefined, nbytes);
|
||||
}
|
||||
};
|
||||
};
|
||||
|
||||
function read_data(objectStore, ofd, buffer, offset, length, position, callback) {
|
||||
var fileNode;
|
||||
var fileData;
|
||||
|
||||
read_object(objectStore, ofd.id, read_file_data);
|
||||
|
||||
function read_file_data(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
fileNode = result;
|
||||
read_object(objectStore, fileNode.data, handle_file_data);
|
||||
}
|
||||
};
|
||||
|
||||
function handle_file_data(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
fileData = result;
|
||||
var _position = (undefined !== position) ? position : ofd.position;
|
||||
length = (_position + length > buffer.length) ? length - _position : length;
|
||||
var dataView = fileData.subarray(_position, _position + length);
|
||||
if(undefined === position) {
|
||||
ofd.position += length;
|
||||
}
|
||||
callback(undefined, length);
|
||||
}
|
||||
};
|
||||
};
|
||||
|
||||
/*
|
||||
* FileSystem
|
||||
|
|
@ -97,29 +599,66 @@ define(function(require) {
|
|||
deferred.reject(error);
|
||||
};
|
||||
|
||||
var nextDescriptor = 1;
|
||||
var openFiles = {};
|
||||
|
||||
this.readyState = FS_PENDING;
|
||||
this.db = null;
|
||||
this.nextDescriptor = nextDescriptor;
|
||||
this.openFiles = openFiles;
|
||||
};
|
||||
FileSystem.prototype._allocate_descriptor = function _allocate_descriptor(openFileDescription) {
|
||||
var fd = this.nextDescriptor ++;
|
||||
this.openFiles[fd] = openFileDescription;
|
||||
return fd;
|
||||
};
|
||||
FileSystem.prototype._release_descriptor = function _release_descriptor(fd) {
|
||||
delete this.openFiles[fd];
|
||||
};
|
||||
FileSystem.prototype.open = function open(path, flags) {
|
||||
var that = this;
|
||||
var deferred = when.defer();
|
||||
var transaction = this.db.transaction([FILE_STORE_NAME], IDB_RW);
|
||||
var files = transaction.objectStore(FILE_STORE_NAME);
|
||||
|
||||
function check_result(error, fd) {
|
||||
function check_result(error, fileNode) {
|
||||
if(error) {
|
||||
// if(transaction.error) transaction.abort();
|
||||
deferred.reject(error);
|
||||
} else {
|
||||
deferred.resolve();
|
||||
var position;
|
||||
if(_(flags).contains(O_APPEND)) {
|
||||
position = fileNode.size;
|
||||
} else {
|
||||
position = 0;
|
||||
}
|
||||
var openFileDescription = new OpenFileDescription(fileNode.id, flags, position);
|
||||
var fd = that._allocate_descriptor(openFileDescription);
|
||||
deferred.resolve(fd);
|
||||
}
|
||||
};
|
||||
|
||||
open_file(files, path, flags, check_result);
|
||||
if(!_(O_FLAGS).has(flags)) {
|
||||
deferred.reject(new EInvalid('flags is not valid'));
|
||||
} else {
|
||||
flags = O_FLAGS[flags];
|
||||
}
|
||||
|
||||
open_file(this, files, path, flags, check_result);
|
||||
|
||||
return deferred.promise;
|
||||
};
|
||||
FileSystem.prototype.opendir = function opendir(path) {
|
||||
FileSystem.prototype.close = function close(fd) {
|
||||
var deferred = when.defer();
|
||||
|
||||
if(!_(this.openFiles).has(fd)) {
|
||||
deferred.reject(new EBadFileDescriptor('invalid file descriptor'));
|
||||
} else {
|
||||
this._release_descriptor(fd);
|
||||
deferred.resolve();
|
||||
}
|
||||
|
||||
return deferred.promise;
|
||||
};
|
||||
FileSystem.prototype.mkdir = function mkdir(path) {
|
||||
var deferred = when.defer();
|
||||
|
|
@ -128,7 +667,7 @@ define(function(require) {
|
|||
|
||||
function check_result(error) {
|
||||
if(error) {
|
||||
if(transaction.error) transaction.abort();
|
||||
// if(transaction.error) transaction.abort();
|
||||
deferred.reject(error);
|
||||
} else {
|
||||
deferred.resolve();
|
||||
|
|
@ -145,7 +684,7 @@ define(function(require) {
|
|||
|
||||
function check_result(error) {
|
||||
if(error) {
|
||||
if(transaction.error) transaction.abort();
|
||||
// if(transaction.error) transaction.abort();
|
||||
deferred.reject(error);
|
||||
} else {
|
||||
deferred.resolve();
|
||||
|
|
@ -157,6 +696,9 @@ define(function(require) {
|
|||
};
|
||||
FileSystem.prototype.stat = function stat(path) {
|
||||
|
||||
};
|
||||
FileSystem.prototype.fstat = function fstat(fd) {
|
||||
|
||||
};
|
||||
FileSystem.prototype.link = function link(oldpath, newpath) {
|
||||
|
||||
|
|
@ -169,6 +711,71 @@ define(function(require) {
|
|||
};
|
||||
FileSystem.prototype.setxattr = function setxattr(path, name, value) {
|
||||
|
||||
};
|
||||
FileSystem.prototype.read = function read(fd, buffer, offset, length, position) {
|
||||
var deferred = when.defer();
|
||||
var transaction = this.db.transaction([FILE_STORE_NAME], IDB_RW);
|
||||
var files = transaction.objectStore(FILE_STORE_NAME);
|
||||
|
||||
offset = (undefined === offset) ? 0 : offset;
|
||||
length = (undefined === length) ? buffer.length - offset : length;
|
||||
|
||||
function check_result(error, nbytes) {
|
||||
if(error) {
|
||||
deferred.reject(error);
|
||||
} else {
|
||||
deferred.resolve(nbytes);
|
||||
}
|
||||
};
|
||||
|
||||
var ofd = this.openFiles[fd];
|
||||
|
||||
if(!ofd) {
|
||||
deferred.reject(new EBadFileDescriptor('invalid file descriptor'));
|
||||
} else if(!_(flags).contains(O_READ)) {
|
||||
deferred.reject(new EBadFileDescriptor('descriptor does not permit reading'));
|
||||
} else {
|
||||
read_data(files, ofd, buffer, offset, length, position, check_result);
|
||||
}
|
||||
|
||||
// TODO: check buffer length
|
||||
|
||||
return deferred.promise;
|
||||
};
|
||||
FileSystem.prototype.write = function write(fd, buffer, offset, length, position) {
|
||||
var deferred = when.defer();
|
||||
var transaction = this.db.transaction([FILE_STORE_NAME], IDB_RW);
|
||||
var files = transaction.objectStore(FILE_STORE_NAME);
|
||||
|
||||
offset = (undefined === offset) ? 0 : offset;
|
||||
length = (undefined === length) ? buffer.length - offset : length;
|
||||
|
||||
function check_result(error, nbytes) {
|
||||
if(error) {
|
||||
deferred.reject(error);
|
||||
} else {
|
||||
deferred.resolve(nbytes);
|
||||
}
|
||||
};
|
||||
|
||||
var ofd = this.openFiles[fd];
|
||||
|
||||
if(!ofd) {
|
||||
deferred.reject(new EBadFileDescriptor('invalid file descriptor'));
|
||||
} else if(!_(flags).contains(O_WRITE)) {
|
||||
deferred.reject(new EBadFileDescriptor('descriptor does not permit writing'));
|
||||
} else if(buffer.length - offset < length) {
|
||||
deferred.reject(new EIO('intput buffer is too small'));
|
||||
} else {
|
||||
write_data(files, ofd, buffer, offset, length, position, check_result);
|
||||
}
|
||||
|
||||
// TODO: check buffer length
|
||||
|
||||
return deferred.promise;
|
||||
};
|
||||
FileSystem.prototype.seek = function seek(fd, offset, origin) {
|
||||
|
||||
};
|
||||
|
||||
return {
|
||||
|
|
|
|||
135
src/file.js
135
src/file.js
|
|
@ -1,135 +0,0 @@
|
|||
define(function(require) {
|
||||
|
||||
var _ = require('lodash');
|
||||
|
||||
var normalize = require('src/path').normalize;
|
||||
var dirname = require('src/path').dirname;
|
||||
var basename = require('src/path').basename;
|
||||
|
||||
var MODE_FILE = require('src/constants').MODE_FILE;
|
||||
|
||||
var guid = require('src/shared').guid;
|
||||
var hash = require('src/shared').hash;
|
||||
|
||||
var read_object = require('src/object-store').read_object;
|
||||
var write_object = require('src/object-store').write_object;
|
||||
var delete_object = require('src/object-store').delete_object;
|
||||
var find_node = require('src/object-store').find_node;
|
||||
|
||||
var O_READ = require('src/constants').O_READ;
|
||||
var O_WRITE = require('src/constants').O_WRITE;
|
||||
var O_CREATE = require('src/constants').O_CREATE;
|
||||
var O_EXCLUSIVE = require('src/constants').O_EXCLUSIVE;
|
||||
var O_TRUNCATE = require('src/constants').O_TRUNCATE;
|
||||
var O_APPEND = require('src/constants').O_APPEND;
|
||||
var O_FLAGS = require('src/constants').O_FLAGS;
|
||||
|
||||
var EInvalid = require('src/error').EInvalid;
|
||||
|
||||
function DirectoryEntry(id, type) {
|
||||
this.id = id;
|
||||
this.type = type || MODE_FILE;
|
||||
};
|
||||
|
||||
function Node(id, mode, size, atime, ctime, mtime, flags, xattrs, links, version) {
|
||||
var now = Date.now();
|
||||
|
||||
this.id = id || hash(guid()),
|
||||
this.mode = mode || MODE_FILE; // node type (file, directory, etc)
|
||||
this.size = size || 0; // size (bytes for files, entries for directories)
|
||||
this.atime = atime || now; // access time
|
||||
this.ctime = ctime || now; // creation time
|
||||
this.mtime = mtime || now; // modified time
|
||||
this.flags = flags || []; // file flags
|
||||
this.xattrs = xattrs || {}; // extended attributes
|
||||
this.links = links || 0; // links count
|
||||
this.version = version || 0; // node version
|
||||
this.data = hash(this.id) // id for data object
|
||||
};
|
||||
|
||||
function open_file(objectStore, path, flags, callback) {
|
||||
path = normalize(path);
|
||||
var name = basename(path);
|
||||
var parentPath = dirname(path);
|
||||
|
||||
var directoryNode;
|
||||
var directoryData;
|
||||
var fileNode;
|
||||
var fileData;
|
||||
|
||||
if(!_(O_FLAGS).has(flags)) {
|
||||
return callback(new EInvalid('flags is not valid'));
|
||||
} else {
|
||||
flags = O_FLAGS[flags];
|
||||
}
|
||||
|
||||
find_node(objectStore, parentPath, read_directory_data);
|
||||
|
||||
function read_directory_data(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
directoryNode = result;
|
||||
read_object(objectStore, directoryNode.data, check_if_file_exists);
|
||||
}
|
||||
};
|
||||
|
||||
function check_if_file_exists(error, result) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
directoryData = result;
|
||||
if(_(directoryData).has(name)) {
|
||||
if(_(flags).contains(O_EXCLUSIVE)) {
|
||||
callback(new ENoEntry('O_CREATE and O_EXCLUSIVE are set, and the named file exists'))
|
||||
}
|
||||
} else {
|
||||
if(!_(flags).contains(O_CREATE)) {
|
||||
callback(new ENoEntry('O_CREATE is not set and the named file does not exist'));
|
||||
} else {
|
||||
write_file_node();
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
function write_file_node() {
|
||||
fileNode = new Node(undefined, MODE_FILE);
|
||||
fileNode.links += 1;
|
||||
write_object(objectStore, fileNode, fileNode.id, write_file_data);
|
||||
};
|
||||
|
||||
function write_file_data(error) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
fileData = {};
|
||||
write_object(objectStore, fileData, fileNode.data, update_directory_data);
|
||||
}
|
||||
};
|
||||
|
||||
function update_directory_data(error) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
directoryData[name] = new DirectoryEntry(fileNode.id, MODE_FILE);
|
||||
write_object(objectStore, directoryData, directoryNode.data, create_file_descriptor);
|
||||
}
|
||||
};
|
||||
|
||||
function create_file_descriptor(error) {
|
||||
if(error) {
|
||||
console.log(error);
|
||||
} else {
|
||||
callback(undefined, '!');
|
||||
}
|
||||
};
|
||||
};
|
||||
|
||||
return {
|
||||
Node: Node,
|
||||
open_file: open_file,
|
||||
DirectoryEntry: DirectoryEntry,
|
||||
};
|
||||
|
||||
});
|
||||
|
|
@ -1,110 +0,0 @@
|
|||
define(function(require) {
|
||||
|
||||
var ENoEntry = require('src/error').ENoEntry;
|
||||
var ENotDirectory = require('src/error').ENotDirectory;
|
||||
var EExists = require('src/error').EExists;
|
||||
|
||||
var normalize = require('src/path').normalize;
|
||||
var dirname = require('src/path').dirname;
|
||||
var basename = require('src/path').basename;
|
||||
|
||||
var ROOT_DIRECTORY_NAME = require('src/constants').ROOT_DIRECTORY_NAME;
|
||||
var ROOT_NODE_ID = require('src/constants').ROOT_NODE_ID;
|
||||
|
||||
var MODE_DIRECTORY = require('src/constants').MODE_DIRECTORY;
|
||||
|
||||
// in: file or directory path
|
||||
// out: node structure, or error
|
||||
function find_node(objectStore, path, callback) {
|
||||
path = normalize(path);
|
||||
if(!path) {
|
||||
return callback(new ENoEntry('path is an empty string'));
|
||||
}
|
||||
var name = basename(path);
|
||||
|
||||
if(ROOT_DIRECTORY_NAME == name) {
|
||||
function check_root_directory_node(error, rootDirectoryNode) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else if(!rootDirectoryNode) {
|
||||
callback(new ENoEntry('path does not exist'));
|
||||
} else {
|
||||
callback(undefined, rootDirectoryNode);
|
||||
}
|
||||
};
|
||||
|
||||
read_object(objectStore, ROOT_NODE_ID, check_root_directory_node);
|
||||
} else {
|
||||
// in: parent directory node
|
||||
// out: parent directory data
|
||||
function read_parent_directory_data(error, parentDirectoryNode) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else if(!_(parentDirectoryNode).has('data') || !parentDirectoryNode.type == MODE_DIRECTORY) {
|
||||
callback(new ENotDirectory('a component of the path prefix is not a directory'));
|
||||
} else {
|
||||
read_object(objectStore, parentDirectoryNode.data, get_node_id_from_parent_directory_data);
|
||||
}
|
||||
};
|
||||
|
||||
// in: parent directory data
|
||||
// out: searched node id
|
||||
function get_node_id_from_parent_directory_data(error, parentDirectoryData) {
|
||||
if(error) {
|
||||
callback(error);
|
||||
} else {
|
||||
if(!_(parentDirectoryData).has(name)) {
|
||||
callback(new ENoEntry('path does not exist'));
|
||||
} else {
|
||||
var nodeId = parentDirectoryData[name].id;
|
||||
read_object(objectStore, nodeId, callback);
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
var parentPath = dirname(path);
|
||||
find_node(objectStore, parentPath, read_parent_directory_data);
|
||||
}
|
||||
};
|
||||
|
||||
function read_object(objectStore, id, callback) {
|
||||
var getRequest = objectStore.get(id);
|
||||
getRequest.onsuccess = function onsuccess(event) {
|
||||
var result = event.target.result;
|
||||
callback(undefined, result);
|
||||
};
|
||||
getRequest.onerror = function onerror(error) {
|
||||
callback(error);
|
||||
};
|
||||
};
|
||||
|
||||
function write_object(objectStore, object, id, callback) {
|
||||
var putRequest = objectStore.put(object, id);
|
||||
putRequest.onsuccess = function onsuccess(event) {
|
||||
var result = event.target.result;
|
||||
callback(undefined, result);
|
||||
};
|
||||
putRequest.onerror = function onerror(error) {
|
||||
callback(error);
|
||||
};
|
||||
};
|
||||
|
||||
function delete_object(objectStore, id, callback) {
|
||||
var deleteRequest = objectStore.delete(id);
|
||||
deleteRequest.onsuccess = function onsuccess(event) {
|
||||
var result = event.target.result;
|
||||
callback(undefined, result);
|
||||
};
|
||||
deleteRequest.onerror = function(error) {
|
||||
callback(error);
|
||||
};
|
||||
};
|
||||
|
||||
return {
|
||||
read_object: read_object,
|
||||
write_object: write_object,
|
||||
delete_object: delete_object,
|
||||
find_node: find_node
|
||||
};
|
||||
|
||||
});
|
||||
Loading…
Reference in New Issue