luci-base: add uci.js and rpc.js classes

Add a new rpc.js class which provides low level facilities to exchanges
messages with the ubus rpc endpoint.

Also introduce a new uci.js class which provides client side uci
manipulation routines.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

2 files changed, 696 insertions, 0 deletions

diff --git a/modules/luci-base/htdocs/luci-static/resources/rpc.js b/modules/luci-base/htdocs/luci-static/resources/rpc.js
new file mode 100644
index 000000000..cc22d0aeb
--- /dev/null
+++ b/modules/luci-base/htdocs/luci-static/resources/rpc.js
@@ -0,0 +1,196 @@
+'use strict';
+
+var rpcRequestRegistry = {},
+    rpcRequestBatch = null,
+    rpcRequestID = 1,
+    rpcSessionID = L.env.sessionid || '00000000000000000000000000000000';
+
+return L.Class.extend({
+	call: function(req, cbFn) {
+		var cb = cbFn.bind(this, req),
+		    q = '';
+
+		if (Array.isArray(req)) {
+			if (req.length == 0)
+				return Promise.resolve([]);
+
+			for (var i = 0; i < req.length; i++)
+				q += '%s%s.%s'.format(
+					q ? ';' : '/',
+					req[i].params[1],
+					req[i].params[2]
+				);
+		}
+		else {
+			q += '/%s.%s'.format(req.params[1], req.params[2]);
+		}
+
+		return L.Request.post(L.url('admin/ubus') + q, req, {
+			timeout: (L.env.rpctimeout || 5) * 1000,
+			credentials: true
+		}).then(cb);
+	},
+
+	handleListReply: function(req, msg) {
+		var list = msg.result;
+
+		/* verify message frame */
+		if (typeof(msg) != 'object' || msg.jsonrpc != '2.0' || !msg.id || !Array.isArray(list))
+			list = [ ];
+
+		req.resolve(list);
+	},
+
+	handleCallReply: function(reqs, res) {
+		var type = Object.prototype.toString,
+		    data = [],
+		    msg = null;
+
+		if (!res.ok)
+			L.error('RPCError', 'RPC call failed with HTTP error %d: %s',
+				res.status, res.statusText || '?');
+
+		msg = res.json();
+
+		if (!Array.isArray(reqs)) {
+			msg = [ msg ];
+			reqs = [ reqs ];
+		}
+
+		for (var i = 0; i < msg.length; i++) {
+			/* fetch related request info */
+			var req = rpcRequestRegistry[reqs[i].id];
+			if (typeof(req) != 'object')
+				throw 'No related request for JSON response';
+
+			/* fetch response attribute and verify returned type */
+			var ret = undefined;
+
+			/* verify message frame */
+			if (typeof(msg[i]) == 'object' && msg[i].jsonrpc == '2.0') {
+				if (typeof(msg[i].error) == 'object' && msg[i].error.code && msg[i].error.message)
+					req.reject(new Error('RPC call failed with error %d: %s'
+						.format(msg[i].error.code, msg[i].error.message || '?')));
+				else if (Array.isArray(msg[i].result) && msg[i].result[0] == 0)
+					ret = (msg[i].result.length > 1) ? msg[i].result[1] : msg[i].result[0];
+			}
+			else {
+				req.reject(new Error('Invalid message frame received'));
+			}
+
+			if (req.expect) {
+				for (var key in req.expect) {
+					if (ret != null && key != '')
+						ret = ret[key];
+
+					if (ret == null || type.call(ret) != type.call(req.expect[key]))
+						ret = req.expect[key];
+
+					break;
+				}
+			}
+
+			/* apply filter */
+			if (typeof(req.filter) == 'function') {
+				req.priv[0] = ret;
+				req.priv[1] = req.params;
+				ret = req.filter.apply(this, req.priv);
+			}
+
+			req.resolve(ret);
+
+			/* store response data */
+			if (typeof(req.index) == 'number')
+				data[req.index] = ret;
+			else
+				data = ret;
+
+			/* delete request object */
+			delete rpcRequestRegistry[reqs[i].id];
+		}
+
+		return Promise.resolve(data);
+	},
+
+	list: function() {
+		var msg = {
+			jsonrpc: '2.0',
+			id:      rpcRequestID++,
+			method:  'list',
+			params:  arguments.length ? this.varargs(arguments) : undefined
+		};
+
+		return this.call(msg, this.handleListReply);
+	},
+
+	batch: function() {
+		if (!Array.isArray(rpcRequestBatch))
+			rpcRequestBatch = [ ];
+	},
+
+	flush: function() {
+		if (!Array.isArray(rpcRequestBatch))
+			return Promise.resolve([]);
+
+		var req = rpcRequestBatch;
+		rpcRequestBatch = null;
+
+		/* call rpc */
+		return this.call(req, this.handleCallReply);
+	},
+
+	declare: function(options) {
+		return Function.prototype.bind.call(function(rpc, options) {
+			var args = this.varargs(arguments, 2);
+			return new Promise(function(resolveFn, rejectFn) {
+				/* build parameter object */
+				var p_off = 0;
+				var params = { };
+				if (Array.isArray(options.params))
+					for (p_off = 0; p_off < options.params.length; p_off++)
+						params[options.params[p_off]] = args[p_off];
+
+				/* all remaining arguments are private args */
+				var priv = [ undefined, undefined ];
+				for (; p_off < args.length; p_off++)
+					priv.push(args[p_off]);
+
+				/* store request info */
+				var req = rpcRequestRegistry[rpcRequestID] = {
+					expect:  options.expect,
+					filter:  options.filter,
+					resolve: resolveFn,
+					reject:  rejectFn,
+					params:  params,
+					priv:    priv
+				};
+
+				/* build message object */
+				var msg = {
+					jsonrpc: '2.0',
+					id:      rpcRequestID++,
+					method:  'call',
+					params:  [
+						rpcSessionID,
+						options.object,
+						options.method,
+						params
+					]
+				};
+
+				/* when a batch is in progress then store index in request data
+				 * and push message object onto the stack */
+				if (Array.isArray(rpcRequestBatch))
+					req.index = rpcRequestBatch.push(msg) - 1;
+
+				/* call rpc */
+				else
+					rpc.call(msg, rpc.handleCallReply);
+			});
+		}, this, this, options);
+	},
+
+	setSessionID: function(sid) {
+		rpcSessionID = sid;
+	}
+});
diff --git a/modules/luci-base/htdocs/luci-static/resources/uci.js b/modules/luci-base/htdocs/luci-static/resources/uci.js
new file mode 100644
index 000000000..fdb8c6ab4
--- /dev/null
+++ b/modules/luci-base/htdocs/luci-static/resources/uci.js
@@ -0,0 +1,500 @@
+'use strict';
+'require rpc';
+
+return L.Class.extend({
+	__init__: function() {
+		this.state = {
+			newidx:  0,
+			values:  { },
+			creates: { },
+			changes: { },
+			deletes: { },
+			reorder: { }
+		};
+	},
+
+	callLoad: rpc.declare({
+		object: 'uci',
+		method: 'get',
+		params: [ 'config' ],
+		expect: { values: { } }
+	}),
+
+	callOrder: rpc.declare({
+		object: 'uci',
+		method: 'order',
+		params: [ 'config', 'sections' ]
+	}),
+
+	callAdd: rpc.declare({
+		object: 'uci',
+		method: 'add',
+		params: [ 'config', 'type', 'name', 'values' ],
+		expect: { section: '' }
+	}),
+
+	callSet: rpc.declare({
+		object: 'uci',
+		method: 'set',
+		params: [ 'config', 'section', 'values' ]
+	}),
+
+	callDelete: rpc.declare({
+		object: 'uci',
+		method: 'delete',
+		params: [ 'config', 'section', 'options' ]
+	}),
+
+	callApply: rpc.declare({
+		object: 'uci',
+		method: 'apply',
+		params: [ 'timeout', 'rollback' ]
+	}),
+
+	callConfirm: rpc.declare({
+		object: 'uci',
+		method: 'confirm'
+	}),
+
+	createSID: function(conf) {
+		var v = this.state.values,
+		    n = this.state.creates,
+		    sid;
+
+		do {
+			sid = "new%06x".format(Math.random() * 0xFFFFFF);
+		} while ((n[conf] && n[conf][sid]) || (v[conf] && v[conf][sid]));
+
+		return sid;
+	},
+
+	reorderSections: function() {
+		var v = this.state.values,
+		    n = this.state.creates,
+		    r = this.state.reorder,
+		    tasks = [];
+
+		if (Object.keys(r).length === 0)
+			return Promise.resolve();
+
+		/*
+		 gather all created and existing sections, sort them according
+		 to their index value and issue an uci order call
+		*/
+		for (var c in r) {
+			var o = [ ];
+
+			if (n[c])
+				for (var s in n[c])
+					o.push(n[c][s]);
+
+			for (var s in v[c])
+				o.push(v[c][s]);
+
+			if (o.length > 0) {
+				o.sort(function(a, b) {
+					return (a['.index'] - b['.index']);
+				});
+
+				var sids = [ ];
+
+				for (var i = 0; i < o.length; i++)
+					sids.push(o[i]['.name']);
+
+				tasks.push(this.callOrder(c, sids));
+			}
+		}
+
+		this.state.reorder = { };
+		return Promise.all(tasks);
+	},
+
+	load: function(packages) {
+		var self = this,
+		    seen = { },
+		    pkgs = [ ],
+		    tasks = [];
+
+		if (!Array.isArray(packages))
+			packages = [ packages ];
+
+		for (var i = 0; i < packages.length; i++)
+			if (!seen[packages[i]] && !self.state.values[packages[i]]) {
+				pkgs.push(packages[i]);
+				seen[packages[i]] = true;
+				tasks.push(self.callLoad(packages[i]));
+			}
+
+		return Promise.all(tasks).then(function(responses) {
+			for (var i = 0; i < responses.length; i++)
+				self.state.values[pkgs[i]] = responses[i];
+
+			document.dispatchEvent(new CustomEvent('uci-loaded'));
+
+			return pkgs;
+		});
+	},
+
+	unload: function(packages) {
+		if (!Array.isArray(packages))
+			packages = [ packages ];
+
+		for (var i = 0; i < packages.length; i++) {
+			delete this.state.values[packages[i]];
+			delete this.state.creates[packages[i]];
+			delete this.state.changes[packages[i]];
+			delete this.state.deletes[packages[i]];
+		}
+	},
+
+	add: function(conf, type, name) {
+		var n = this.state.creates,
+		    sid = name || this.createSID(conf);
+
+		if (!n[conf])
+			n[conf] = { };
+
+		n[conf][sid] = {
+			'.type':      type,
+			'.name':      sid,
+			'.create':    name,
+			'.anonymous': !name,
+			'.index':     1000 + this.state.newidx++
+		};
+
+		return sid;
+	},
+
+	remove: function(conf, sid) {
+		var n = this.state.creates,
+		    c = this.state.changes,
+		    d = this.state.deletes;
+
+		/* requested deletion of a just created section */
+		if (n[conf] && n[conf][sid]) {
+			delete n[conf][sid];
+		}
+		else {
+			if (c[conf])
+				delete c[conf][sid];
+
+			if (!d[conf])
+				d[conf] = { };
+
+			d[conf][sid] = true;
+		}
+	},
+
+	sections: function(conf, type, cb) {
+		var sa = [ ],
+		    v = this.state.values[conf],
+		    n = this.state.creates[conf],
+		    c = this.state.changes[conf],
+		    d = this.state.deletes[conf];
+
+		if (!v)
+			return sa;
+
+		for (var s in v)
+			if (!d || d[s] !== true)
+				if (!type || v[s]['.type'] == type)
+					sa.push(Object.assign({ }, v[s], c ? c[s] : undefined));
+
+		if (n)
+			for (var s in n)
+				if (!type || n[s]['.type'] == type)
+					sa.push(Object.assign({ }, n[s]));
+
+		sa.sort(function(a, b) {
+			return a['.index'] - b['.index'];
+		});
+
+		for (var i = 0; i < sa.length; i++)
+			sa[i]['.index'] = i;
+
+		if (typeof(cb) == 'function')
+			for (var i = 0; i < sa.length; i++)
+				cb.call(this, sa[i], sa[i]['.name']);
+
+		return sa;
+	},
+
+	get: function(conf, sid, opt) {
+		var v = this.state.values,
+		    n = this.state.creates,
+		    c = this.state.changes,
+		    d = this.state.deletes;
+
+		if (typeof(sid) == 'undefined')
+			return undefined;
+
+		/* requested option in a just created section */
+		if (n[conf] && n[conf][sid]) {
+			if (!n[conf])
+				return undefined;
+
+			if (typeof(opt) == 'undefined')
+				return n[conf][sid];
+
+			return n[conf][sid][opt];
+		}
+
+		/* requested an option value */
+		if (typeof(opt) != 'undefined') {
+			/* check whether option was deleted */
+			if (d[conf] && d[conf][sid]) {
+				if (d[conf][sid] === true)
+					return undefined;
+
+				for (var i = 0; i < d[conf][sid].length; i++)
+					if (d[conf][sid][i] == opt)
+						return undefined;
+			}
+
+			/* check whether option was changed */
+			if (c[conf] && c[conf][sid] && typeof(c[conf][sid][opt]) != 'undefined')
+				return c[conf][sid][opt];
+
+			/* return base value */
+			if (v[conf] && v[conf][sid])
+				return v[conf][sid][opt];
+
+			return undefined;
+		}
+
+		/* requested an entire section */
+		if (v[conf])
+			return v[conf][sid];
+
+		return undefined;
+	},
+
+	set: function(conf, sid, opt, val) {
+		var v = this.state.values,
+		    n = this.state.creates,
+		    c = this.state.changes,
+		    d = this.state.deletes;
+
+		if (sid == null || opt == null || opt.charAt(0) == '.')
+			return;
+
+		if (n[conf] && n[conf][sid]) {
+			if (val != null)
+				n[conf][sid][opt] = val;
+			else
+				delete n[conf][sid][opt];
+		}
+		else if (val != null && val !== '') {
+			/* do not set within deleted section */
+			if (d[conf] && d[conf][sid] === true)
+				return;
+
+			/* only set in existing sections */
+			if (!v[conf] || !v[conf][sid])
+				return;
+
+			if (!c[conf])
+				c[conf] = {};
+
+			if (!c[conf][sid])
+				c[conf][sid] = {};
+
+			/* undelete option */
+			if (d[conf] && d[conf][sid])
+				d[conf][sid] = d[conf][sid].filter(function(o) { return o !== opt });
+
+			c[conf][sid][opt] = val;
+		}
+		else {
+			/* only delete in existing sections */
+			if (!(v[conf] && v[conf][sid] && v[conf][sid].hasOwnProperty(opt)) &&
+			    !(c[conf] && c[conf][sid] && c[conf][sid].hasOwnProperty(opt)))
+			    return;
+
+			if (!d[conf])
+				d[conf] = { };
+
+			if (!d[conf][sid])
+				d[conf][sid] = [ ];
+
+			if (d[conf][sid] !== true)
+				d[conf][sid].push(opt);
+		}
+	},
+
+	unset: function(conf, sid, opt) {
+		return this.set(conf, sid, opt, null);
+	},
+
+	get_first: function(conf, type, opt) {
+		var sid = null;
+
+		this.sections(conf, type, function(s) {
+			if (sid == null)
+				sid = s['.name'];
+		});
+
+		return this.get(conf, sid, opt);
+	},
+
+	set_first: function(conf, type, opt, val) {
+		var sid = null;
+
+		this.sections(conf, type, function(s) {
+			if (sid == null)
+				sid = s['.name'];
+		});
+
+		return this.set(conf, sid, opt, val);
+	},
+
+	unset_first: function(conf, type, opt) {
+		return this.set_first(conf, type, opt, null);
+	},
+
+	move: function(conf, sid1, sid2, after) {
+		var sa = this.sections(conf),
+		    s1 = null, s2 = null;
+
+		for (var i = 0; i < sa.length; i++) {
+			if (sa[i]['.name'] != sid1)
+				continue;
+
+			s1 = sa[i];
+			sa.splice(i, 1);
+			break;
+		}
+
+		if (s1 == null)
+			return false;
+
+		if (sid2 == null) {
+			sa.push(s1);
+		}
+		else {
+			for (var i = 0; i < sa.length; i++) {
+				if (sa[i]['.name'] != sid2)
+					continue;
+
+				s2 = sa[i];
+				sa.splice(i + !!after, 0, s1);
+				break;
+			}
+
+			if (s2 == null)
+				return false;
+		}
+
+		for (var i = 0; i < sa.length; i++)
+			this.get(conf, sa[i]['.name'])['.index'] = i;
+
+		this.state.reorder[conf] = true;
+
+		return true;
+	},
+
+	save: function() {
+		var v = this.state.values,
+		    n = this.state.creates,
+		    c = this.state.changes,
+		    d = this.state.deletes,
+		    self = this,
+		    snew = [ ],
+		    pkgs = { },
+		    tasks = [];
+
+		if (n)
+			for (var conf in n) {
+				for (var sid in n[conf]) {
+					var r = {
+						config: conf,
+						values: { }
+					};
+
+					for (var k in n[conf][sid]) {
+						if (k == '.type')
+							r.type = n[conf][sid][k];
+						else if (k == '.create')
+							r.name = n[conf][sid][k];
+						else if (k.charAt(0) != '.')
+							r.values[k] = n[conf][sid][k];
+					}
+
+					snew.push(n[conf][sid]);
+					tasks.push(self.callAdd(r.config, r.type, r.name, r.values));
+				}
+
+				pkgs[conf] = true;
+			}
+
+		if (c)
+			for (var conf in c) {
+				for (var sid in c[conf])
+					tasks.push(self.callSet(conf, sid, c[conf][sid]));
+
+				pkgs[conf] = true;
+			}
+
+		if (d)
+			for (var conf in d) {
+				for (var sid in d[conf]) {
+					var o = d[conf][sid];
+					tasks.push(self.callDelete(conf, sid, (o === true) ? null : o));
+				}
+
+				pkgs[conf] = true;
+			}
+
+		return Promise.all(tasks).then(function(responses) {
+			/*
+			 array "snew" holds references to the created uci sections,
+			 use it to assign the returned names of the new sections
+			*/
+			for (var i = 0; i < snew.length; i++)
+				snew[i]['.name'] = responses[i];
+
+			return self.reorderSections();
+		}).then(function() {
+			pkgs = Object.keys(pkgs);
+
+			self.unload(pkgs);
+
+			return self.load(pkgs);
+		});
+	},
+
+	apply: function(timeout) {
+		var self = this,
+		    date = new Date();
+
+		if (typeof(timeout) != 'number' || timeout < 1)
+			timeout = 10;
+
+		return self.callApply(timeout, true).then(function(rv) {
+			if (rv != 0)
+				return Promise.reject(rv);
+
+			var try_deadline = date.getTime() + 1000 * timeout;
+			var try_confirm = function() {
+				return self.callConfirm().then(function(rv) {
+					if (rv != 0) {
+						if (date.getTime() < try_deadline)
+							window.setTimeout(try_confirm, 250);
+						else
+							return Promise.reject(rv);
+					}
+
+					return rv;
+				});
+			};
+
+			window.setTimeout(try_confirm, 1000);
+		});
+	},
+
+	changes: rpc.declare({
+		object: 'uci',
+		method: 'changes',
+		expect: { changes: { } }
+	})
+});