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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 ipc_channel::ipc::{self, IpcReceiver, IpcSender};
use net_traits::storage_thread::{StorageThread, StorageThreadMsg, StorageType};
use resource_thread;
use std::borrow::ToOwned;
use std::collections::BTreeMap;
use std::collections::HashMap;
use url::Url;
use util::opts;
use util::thread::spawn_named;
const QUOTA_SIZE_LIMIT: usize = 5 * 1024 * 1024;
pub trait StorageThreadFactory {
fn new() -> Self;
}
impl StorageThreadFactory for StorageThread {
/// Create a StorageThread
fn new() -> StorageThread {
let (chan, port) = ipc::channel().unwrap();
spawn_named("StorageManager".to_owned(), move || {
StorageManager::new(port).start();
});
chan
}
}
struct StorageManager {
port: IpcReceiver<StorageThreadMsg>,
session_data: HashMap<String, (usize, BTreeMap<String, String>)>,
local_data: HashMap<String, (usize, BTreeMap<String, String>)>,
}
impl StorageManager {
fn new(port: IpcReceiver<StorageThreadMsg>) -> StorageManager {
StorageManager {
port: port,
session_data: HashMap::new(),
local_data: HashMap::new(),
}
}
}
impl StorageManager {
fn start(&mut self) {
loop {
match self.port.recv().unwrap() {
StorageThreadMsg::Length(sender, url, storage_type) => {
self.length(sender, url, storage_type)
}
StorageThreadMsg::Key(sender, url, storage_type, index) => {
self.key(sender, url, storage_type, index)
}
StorageThreadMsg::Keys(sender, url, storage_type) => {
self.keys(sender, url, storage_type)
}
StorageThreadMsg::SetItem(sender, url, storage_type, name, value) => {
self.set_item(sender, url, storage_type, name, value)
}
StorageThreadMsg::GetItem(sender, url, storage_type, name) => {
self.request_item(sender, url, storage_type, name)
}
StorageThreadMsg::RemoveItem(sender, url, storage_type, name) => {
self.remove_item(sender, url, storage_type, name)
}
StorageThreadMsg::Clear(sender, url, storage_type) => {
self.clear(sender, url, storage_type)
}
StorageThreadMsg::Exit => {
if let Some(ref profile_dir) = opts::get().profile_dir {
resource_thread::write_json_to_file(&self.local_data, profile_dir, "local_data.json");
}
break
}
}
}
}
fn select_data(&self, storage_type: StorageType)
-> &HashMap<String, (usize, BTreeMap<String, String>)> {
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, (usize, BTreeMap<String, String>)> {
match storage_type {
StorageType::Session => &mut self.session_data,
StorageType::Local => &mut self.local_data
}
}
fn length(&self, sender: IpcSender<usize>, url: Url, storage_type: StorageType) {
let origin = self.origin_as_string(url);
let data = self.select_data(storage_type);
sender.send(data.get(&origin).map_or(0, |&(_, ref entry)| entry.len())).unwrap();
}
fn key(&self,
sender: IpcSender<Option<String>>,
url: Url,
storage_type: StorageType,
index: u32) {
let origin = self.origin_as_string(url);
let data = self.select_data(storage_type);
let key = data.get(&origin)
.and_then(|&(_, ref entry)| entry.keys().nth(index as usize))
.cloned();
sender.send(key).unwrap();
}
fn keys(&self,
sender: IpcSender<Vec<String>>,
url: Url,
storage_type: StorageType) {
let origin = self.origin_as_string(url);
let data = self.select_data(storage_type);
let keys = data.get(&origin)
.map_or(vec![], |&(_, ref entry)| entry.keys().cloned().collect());
sender.send(keys).unwrap();
}
/// Sends Ok(changed, Some(old_value)) in case there was a previous
/// value with the same key name but with different value name
/// otherwise sends Err(()) to indicate that the operation would result in
/// exceeding the quota limit
fn set_item(&mut self,
sender: IpcSender<Result<(bool, Option<String>), ()>>,
url: Url,
storage_type: StorageType,
name: String,
value: String) {
let origin = self.origin_as_string(url);
let current_total_size = {
let local_data = self.select_data(StorageType::Local);
let session_data = self.select_data(StorageType::Session);
let local_data_size = local_data.get(&origin).map_or(0, |&(total, _)| total);
let session_data_size = session_data.get(&origin).map_or(0, |&(total, _)| total);
local_data_size + session_data_size
};
let data = self.select_data_mut(storage_type);
if !data.contains_key(&origin) {
data.insert(origin.clone(), (0, BTreeMap::new()));
}
let message = data.get_mut(&origin).map(|&mut (ref mut total, ref mut entry)| {
let mut new_total_size = current_total_size + value.as_bytes().len();
if let Some(old_value) = entry.get(&name) {
new_total_size -= old_value.as_bytes().len();
} else {
new_total_size += name.as_bytes().len();
}
if new_total_size > QUOTA_SIZE_LIMIT {
return Err(());
}
let message = entry.insert(name.clone(), value.clone()).map_or(
Ok((true, None)),
|old| if old == value {
Ok((false, None))
} else {
Ok((true, Some(old)))
});
*total = new_total_size;
message
}).unwrap();
sender.send(message).unwrap();
}
fn request_item(&self,
sender: IpcSender<Option<String>>,
url: Url,
storage_type: StorageType,
name: String) {
let origin = self.origin_as_string(url);
let data = self.select_data(storage_type);
sender.send(data.get(&origin)
.and_then(|&(_, ref entry)| entry.get(&name))
.map(String::clone)).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: IpcSender<Option<String>>,
url: Url,
storage_type: StorageType,
name: String) {
let origin = self.origin_as_string(url);
let data = self.select_data_mut(storage_type);
let old_value = data.get_mut(&origin).and_then(|&mut (ref mut total, ref mut entry)| {
entry.remove(&name).and_then(|old| {
*total -= name.as_bytes().len() + old.as_bytes().len();
Some(old)
})
});
sender.send(old_value).unwrap();
}
fn clear(&mut self, sender: IpcSender<bool>, url: Url, storage_type: StorageType) {
let origin = self.origin_as_string(url);
let data = self.select_data_mut(storage_type);
sender.send(data.get_mut(&origin)
.map_or(false, |&mut (ref mut total, ref mut entry)| {
if !entry.is_empty() {
entry.clear();
*total = 0;
true
} else {
false
}})).unwrap();
}
fn origin_as_string(&self, url: Url) -> String {
url.origin().ascii_serialization()
}
}
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