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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::borrow::ToOwned;
use std::collections::HashMap;
use std::collections::BTreeMap;
use std::sync::mpsc::{channel, Receiver, Sender};
use url::Url;
use util::str::DOMString;
use util::task::spawn_named;
#[derive(Copy)]
pub enum StorageType {
Session,
Local
}
/// 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, StorageType),
/// gets the name of the key at the specified index in the associated storage data
Key(Sender<Option<DOMString>>, Url, StorageType, u32),
/// gets the value associated with the given key in the associated storage data
GetItem(Sender<Option<DOMString>>, Url, StorageType, DOMString),
/// sets the value of the given key in the associated storage data
/// TODO throw QuotaExceededError in case of error
SetItem(Sender<(bool, Option<DOMString>)>, Url, StorageType, DOMString, DOMString),
/// removes the key/value pair for the given key in the associated storage data
RemoveItem(Sender<Option<DOMString>>, Url, StorageType, DOMString),
/// clears the associated storage data by removing all the key/value pairs
Clear(Sender<bool>, Url, StorageType),
/// shut down this task
Exit
}
/// Handle to a storage task
pub type StorageTask = Sender<StorageTaskMsg>;
pub trait StorageTaskFactory {
fn new() -> Self;
}
impl StorageTaskFactory for StorageTask {
/// Create a StorageTask
fn new() -> StorageTask {
let (chan, port) = channel();
spawn_named("StorageManager".to_owned(), move || {
StorageManager::new(port).start();
});
chan
}
}
struct StorageManager {
port: Receiver<StorageTaskMsg>,
session_data: HashMap<String, BTreeMap<DOMString, DOMString>>,
local_data: HashMap<String, BTreeMap<DOMString, DOMString>>,
}
impl StorageManager {
fn new(port: Receiver<StorageTaskMsg>) -> StorageManager {
StorageManager {
port: port,
session_data: HashMap::new(),
local_data: HashMap::new(),
}
}
}
impl StorageManager {
fn start(&mut self) {
loop {
match self.port.recv().unwrap() {
StorageTaskMsg::Length(sender, url, storage_type) => {
self.length(sender, url, storage_type)
}
StorageTaskMsg::Key(sender, url, storage_type, index) => {
self.key(sender, url, storage_type, index)
}
StorageTaskMsg::SetItem(sender, url, storage_type, name, value) => {
self.set_item(sender, url, storage_type, name, value)
}
StorageTaskMsg::GetItem(sender, url, storage_type, name) => {
self.get_item(sender, url, storage_type, name)
}
StorageTaskMsg::RemoveItem(sender, url, storage_type, name) => {
self.remove_item(sender, url, storage_type, name)
}
StorageTaskMsg::Clear(sender, url, storage_type) => {
self.clear(sender, url, storage_type)
}
StorageTaskMsg::Exit => {
break
}
}
}
}
fn select_data(& self, storage_type: StorageType) -> &HashMap<String, BTreeMap<DOMString, DOMString>> {
match storage_type {
StorageType::Session => &self.session_data,
StorageType::Local => &self.local_data
}
}
fn select_data_mut(&mut self, storage_type: StorageType) -> &mut HashMap<String, BTreeMap<DOMString, DOMString>> {
match storage_type {
StorageType::Session => &mut self.session_data,
StorageType::Local => &mut self.local_data
}
}
fn length(&self, sender: Sender<u32>, url: Url, storage_type: StorageType) {
let origin = self.get_origin_as_string(url);
let data = self.select_data(storage_type);
sender.send(data.get(&origin).map_or(0u, |entry| entry.len()) as u32).unwrap();
}
fn key(&self, sender: Sender<Option<DOMString>>, url: Url, storage_type: StorageType, index: u32) {
let origin = self.get_origin_as_string(url);
let data = self.select_data(storage_type);
sender.send(data.get(&origin)
.and_then(|entry| entry.keys().nth(index as uint))
.map(|key| key.clone())).unwrap();
}
/// Sends Some(old_value) in case there was a previous value with the same key name but with different
/// value name, otherwise sends None
fn set_item(&mut self, sender: Sender<(bool, Option<DOMString>)>, url: Url, storage_type: StorageType, name: DOMString, value: DOMString) {
let origin = self.get_origin_as_string(url);
let data = self.select_data_mut(storage_type);
if !data.contains_key(&origin) {
data.insert(origin.clone(), BTreeMap::new());
}
let (changed, old_value) = data.get_mut(&origin).map(|entry| {
entry.insert(name, value.clone()).map_or(
(true, None),
|old| if old == value {
(false, None)
} else {
(true, Some(old))
})
}).unwrap();
sender.send((changed, old_value)).unwrap();
}
fn get_item(&self, sender: Sender<Option<DOMString>>, url: Url, storage_type: StorageType, name: DOMString) {
let origin = self.get_origin_as_string(url);
let data = self.select_data(storage_type);
sender.send(data.get(&origin)
.and_then(|entry| entry.get(&name))
.map(|value| value.to_string())).unwrap();
}
/// Sends Some(old_value) in case there was a previous value with the key name, otherwise sends None
fn remove_item(&mut self, sender: Sender<Option<DOMString>>, url: Url, storage_type: StorageType, name: DOMString) {
let origin = self.get_origin_as_string(url);
let data = self.select_data_mut(storage_type);
let old_value = data.get_mut(&origin).map(|entry| {
entry.remove(&name)
}).unwrap();
sender.send(old_value).unwrap();
}
fn clear(&mut self, sender: Sender<bool>, url: Url, storage_type: StorageType) {
let origin = self.get_origin_as_string(url);
let data = self.select_data_mut(storage_type);
sender.send(data.get_mut(&origin)
.map_or(false, |entry| {
if !entry.is_empty() {
entry.clear();
true
} else {
false
}})).unwrap();
}
fn get_origin_as_string(&self, url: Url) -> String {
let mut origin = "".to_string();
origin.push_str(&url.scheme);
origin.push_str("://");
url.domain().map(|domain| origin.push_str(&domain));
url.port().map(|port| {
origin.push_str(":");
origin.push_str(&port.to_string());
});
origin.push_str("/");
origin
}
}
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