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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use std::comm::{channel, Receiver, Sender};
use std::collections::HashMap;
use std::collections::TreeMap;
use url::Url;
use servo_util::str::DOMString;
use servo_util::task::spawn_named;
/// Request operations on the storage data associated with a particular url
pub enum StorageTaskMsg {
/// gets the number of key/value pairs present in the associated storage data
Length(Sender<u32>, Url),
/// gets the name of the key at the specified index in the associated storage data
Key(Sender<Option<DOMString>>, Url, u32),
/// gets the value associated with the given key in the associated storage data
GetItem(Sender<Option<DOMString>>, Url, DOMString),
/// sets the value of the given key in the associated storage data
/// TODO throw QuotaExceededError in case of error
SetItem(Sender<bool>, Url, DOMString, DOMString),
/// removes the key/value pair for the given key in the associated storage data
RemoveItem(Sender<bool>, Url, DOMString),
/// clears the associated storage data by removing all the key/value pairs
Clear(Sender<bool>, Url),
/// shut down this task
Exit
}
/// Handle to a storage task
pub type StorageTask = Sender<StorageTaskMsg>;
pub trait StorageTaskFactory {
fn new() -> StorageTask;
}
impl StorageTaskFactory for StorageTask {
/// Create a StorageTask
fn new() -> StorageTask {
let (chan, port) = channel();
spawn_named("StorageManager", proc() {
StorageManager::new(port).start();
});
chan
}
}
struct StorageManager {
port: Receiver<StorageTaskMsg>,
data: HashMap<String, TreeMap<DOMString, DOMString>>,
}
impl StorageManager {
fn new(port: Receiver<StorageTaskMsg>) -> StorageManager {
StorageManager {
port: port,
data: HashMap::new(),
}
}
}
impl StorageManager {
fn start(&mut self) {
loop {
match self.port.recv() {
StorageTaskMsg::Length(sender, url) => {
self.length(sender, url)
}
StorageTaskMsg::Key(sender, url, index) => {
self.key(sender, url, index)
}
StorageTaskMsg::SetItem(sender, url, name, value) => {
self.set_item(sender, url, name, value)
}
StorageTaskMsg::GetItem(sender, url, name) => {
self.get_item(sender, url, name)
}
StorageTaskMsg::RemoveItem(sender, url, name) => {
self.remove_item(sender, url, name)
}
StorageTaskMsg::Clear(sender, url) => {
self.clear(sender, url)
}
StorageTaskMsg::Exit => {
break
}
}
}
}
fn length(&self, sender: Sender<u32>, url: Url) {
let origin = self.get_origin_as_string(url);
sender.send(self.data.get(&origin).map_or(0u, |entry| entry.len()) as u32);
}
fn key(&self, sender: Sender<Option<DOMString>>, url: Url, index: u32) {
let origin = self.get_origin_as_string(url);
sender.send(self.data.get(&origin)
.and_then(|entry| entry.keys().nth(index as uint))
.map(|key| key.clone()));
}
fn set_item(&mut self, sender: Sender<bool>, url: Url, name: DOMString, value: DOMString) {
let origin = self.get_origin_as_string(url);
if !self.data.contains_key(&origin) {
self.data.insert(origin.clone(), TreeMap::new());
}
let updated = self.data.get_mut(&origin).map(|entry| {
if entry.get(&origin).map_or(true, |item| item.as_slice() != value.as_slice()) {
entry.insert(name.clone(), value.clone());
true
} else {
false
}
}).unwrap();
sender.send(updated);
}
fn get_item(&self, sender: Sender<Option<DOMString>>, url: Url, name: DOMString) {
let origin = self.get_origin_as_string(url);
sender.send(self.data.get(&origin)
.and_then(|entry| entry.get(&name))
.map(|value| value.to_string()));
}
fn remove_item(&mut self, sender: Sender<bool>, url: Url, name: DOMString) {
let origin = self.get_origin_as_string(url);
sender.send(self.data.get_mut(&origin)
.map_or(false, |entry| entry.remove(&name).is_some()));
}
fn clear(&mut self, sender: Sender<bool>, url: Url) {
let origin = self.get_origin_as_string(url);
sender.send(self.data.get_mut(&origin)
.map_or(false, |entry| {
if !entry.is_empty() {
entry.clear();
true
} else {
false
}}));
}
fn get_origin_as_string(&self, url: Url) -> String {
let mut origin = "".to_string();
origin.push_str(url.scheme.as_slice());
origin.push_str("://");
url.domain().map(|domain| origin.push_str(domain.as_slice()));
url.port().map(|port| {
origin.push_str(":");
origin.push_str(port.to_string().as_slice());
});
origin.push_str("/");
origin
}
}
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