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<!DOCTYPE html>
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<title>JSDoc: Source: fs.js</title>
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<h1 class="page-title">Source: fs.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>'use strict';
'require rpc';
/**
* @typedef {Object} FileStatEntry
* @memberof LuCI.fs
* @property {string} name - Name of the directory entry
* @property {string} type - Type of the entry, one of `block`, `char`, `directory`, `fifo`, `symlink`, `file`, `socket` or `unknown`
* @property {number} size - Size in bytes
* @property {number} mode - Access permissions
* @property {number} atime - Last access time in seconds since epoch
* @property {number} mtime - Last modification time in seconds since epoch
* @property {number} ctime - Last change time in seconds since epoch
* @property {number} inode - Inode number
* @property {number} uid - Numeric owner id
* @property {number} gid - Numeric group id
*/
/**
* @typedef {Object} FileExecResult
* @memberof LuCI.fs
*
* @property {number} code - The exit code of the invoked command
* @property {string} [stdout] - The stdout produced by the command, if any
* @property {string} [stderr] - The stderr produced by the command, if any
*/
var callFileList, callFileStat, callFileRead, callFileWrite, callFileRemove,
callFileExec, callFileMD5;
callFileList = rpc.declare({
object: 'file',
method: 'list',
params: [ 'path' ]
});
callFileStat = rpc.declare({
object: 'file',
method: 'stat',
params: [ 'path' ]
});
callFileRead = rpc.declare({
object: 'file',
method: 'read',
params: [ 'path' ]
});
callFileWrite = rpc.declare({
object: 'file',
method: 'write',
params: [ 'path', 'data', 'mode' ]
});
callFileRemove = rpc.declare({
object: 'file',
method: 'remove',
params: [ 'path' ]
});
callFileExec = rpc.declare({
object: 'file',
method: 'exec',
params: [ 'command', 'params', 'env' ]
});
callFileMD5 = rpc.declare({
object: 'file',
method: 'md5',
params: [ 'path' ]
});
var rpcErrors = [
null,
'InvalidCommandError',
'InvalidArgumentError',
'MethodNotFoundError',
'NotFoundError',
'NoDataError',
'PermissionError',
'TimeoutError',
'UnsupportedError'
];
function handleRpcReply(expect, rc) {
if (typeof(rc) == 'number' && rc != 0) {
var e = new Error(rpc.getStatusText(rc)); e.name = rpcErrors[rc] || 'Error';
throw e;
}
if (expect) {
var type = Object.prototype.toString;
for (var key in expect) {
if (rc != null && key != '')
rc = rc[key];
if (rc == null || type.call(rc) != type.call(expect[key])) {
var e = new Error(_('Unexpected reply data format')); e.name = 'TypeError';
throw e;
}
break;
}
}
return rc;
}
/**
* @class fs
* @memberof LuCI
* @hideconstructor
* @classdesc
*
* Provides high level utilities to wrap file system related RPC calls.
* To import the class in views, use `'require fs'`, to import it in
* external JavaScript, use `L.require("fs").then(...)`.
*/
var FileSystem = L.Class.extend(/** @lends LuCI.fs.prototype */ {
/**
* Obtains a listing of the specified directory.
*
* @param {string} path
* The directory path to list.
*
* @returns {Promise<LuCI.fs.FileStatEntry[]>}
* Returns a promise resolving to an array of stat detail objects or
* rejecting with an error stating the failure reason.
*/
list: function(path) {
return callFileList(path).then(handleRpcReply.bind(this, { entries: [] }));
},
/**
* Return file stat information on the specified path.
*
* @param {string} path
* The filesystem path to stat.
*
* @returns {Promise<LuCI.fs.FileStatEntry>}
* Returns a promise resolving to a stat detail object or
* rejecting with an error stating the failure reason.
*/
stat: function(path) {
return callFileStat(path).then(handleRpcReply.bind(this, { '': {} }));
},
/**
* Read the contents of the given file and return them.
* Note: this function is unsuitable for obtaining binary data.
*
* @param {string} path
* The file path to read.
*
* @returns {Promise<string>}
* Returns a promise resolving to a string containing the file contents or
* rejecting with an error stating the failure reason.
*/
read: function(path) {
return callFileRead(path).then(handleRpcReply.bind(this, { data: '' }));
},
/**
* Write the given data to the specified file path.
* If the specified file path does not exist, it will be created, given
* sufficient permissions.
*
* Note: `data` will be converted to a string using `String(data)` or to
* `''` when it is `null`.
*
* @param {string} path
* The file path to write to.
*
* @param {*} [data]
* The file data to write. If it is null, it will be set to an empty
* string.
*
* @param {number} [mode]
* The permissions to use on file creation. Default is 420 (0644).
*
* @returns {Promise<number>}
* Returns a promise resolving to `0` or rejecting with an error stating
* the failure reason.
*/
write: function(path, data, mode) {
data = (data != null) ? String(data) : '';
mode = (mode != null) ? mode : 420; // 0644
return callFileWrite(path, data, mode).then(handleRpcReply.bind(this, { '': 0 }));
},
/**
* Unlink the given file.
*
* @param {string}
* The file path to remove.
*
* @returns {Promise<number>}
* Returns a promise resolving to `0` or rejecting with an error stating
* the failure reason.
*/
remove: function(path) {
return callFileRemove(path).then(handleRpcReply.bind(this, { '': 0 }));
},
/**
* Execute the specified command, optionally passing params and
* environment variables.
*
* Note: The `command` must be either the path to an executable,
* or a basename without arguments in which case it will be searched
* in $PATH. If specified, the values given in `params` will be passed
* as arguments to the command.
*
* The key/value pairs in the optional `env` table are translated to
* `setenv()` calls prior to running the command.
*
* @param {string} command
* The command to invoke.
*
* @param {string[]} [params]
* The arguments to pass to the command.
*
* @param {Object.<string, string>} [env]
* Environment variables to set.
*
* @returns {Promise<LuCI.fs.FileExecResult>}
* Returns a promise resolving to an object describing the execution
* results or rejecting with an error stating the failure reason.
*/
exec: function(command, params, env) {
if (!Array.isArray(params))
params = null;
if (!L.isObject(env))
env = null;
return callFileExec(command, params, env).then(handleRpcReply.bind(this, { '': {} }));
},
/**
* Read the contents of the given file, trim leading and trailing white
* space and return the trimmed result. In case of errors, return an empty
* string instead.
*
* Note: this function is useful to read single-value files in `/sys`
* or `/proc`.
*
* This function is guaranteed to not reject its promises, on failure,
* an empty string will be returned.
*
* @param {string} path
* The file path to read.
*
* @returns {Promise<string>}
* Returns a promise resolving to the file contents or the empty string
* on failure.
*/
trimmed: function(path) {
return L.resolveDefault(this.read(path), '').then(function(s) {
return s.trim();
});
},
/**
* Read the contents of the given file, split it into lines, trim
* leading and trailing white space of each line and return the
* resulting array.
*
* This function is guaranteed to not reject its promises, on failure,
* an empty array will be returned.
*
* @param {string} path
* The file path to read.
*
* @returns {Promise<string[]>}
* Returns a promise resolving to an array containing the stripped lines
* of the given file or `[]` on failure.
*/
lines: function(path) {
return L.resolveDefault(this.read(path), '').then(function(s) {
var lines = [];
s = s.trim();
if (s != '') {
var l = s.split(/\n/);
for (var i = 0; i < l.length; i++)
lines.push(l[i].trim());
}
return lines;
});
}
});
return FileSystem;
</code></pre>
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