storage: Move shared functionality to base (#39419)

Part of #39418. See that PR for a full description.

Moves:
- `read_json_from_file`
- `write_json_to_file`
- `IpcSendResult`
- `IpcSend`

Renames:
- `CoreResourceThreadPool` to `ThreadPool` (shorter and more
descriptive, as we use it for more than the core resource thread now)

Signed-off-by: Ashwin Naren <arihant2math@gmail.com>

components/net/resource_thread.rs

@@ -7,8 +7,7 @@
 use std::borrow::ToOwned;
 use std::collections::HashMap;
 use std::fs::File;
-use std::io::prelude::*;
-use std::io::{self, BufReader, BufWriter};
+use std::io::{self, BufReader};
 use std::path::{Path, PathBuf};
 use std::sync::{Arc, Mutex, RwLock, Weak};
 use std::thread;
@@ -22,7 +21,7 @@ use devtools_traits::DevtoolsControlMsg;
 use embedder_traits::EmbedderProxy;
 use hyper_serde::Serde;
 use ipc_channel::ipc::{self, IpcReceiver, IpcReceiverSet, IpcSender};
-use log::{debug, trace, warn};
+use log::{debug, warn};
 use net_traits::blob_url_store::parse_blob_url;
 use net_traits::filemanager_thread::FileTokenCheck;
 use net_traits::indexeddb_thread::IndexedDBThreadMsg;
@@ -198,9 +197,9 @@ fn create_http_states(
     let http_cache = HttpCache::default();
     let mut cookie_jar = CookieStorage::new(150);
     if let Some(config_dir) = config_dir {
-        read_json_from_file(&mut auth_cache, config_dir, "auth_cache.json");
-        read_json_from_file(&mut hsts_list, config_dir, "hsts_list.json");
-        read_json_from_file(&mut cookie_jar, config_dir, "cookie_jar.json");
+        base::read_json_from_file(&mut auth_cache, config_dir, "auth_cache.json");
+        base::read_json_from_file(&mut hsts_list, config_dir, "hsts_list.json");
+        base::read_json_from_file(&mut cookie_jar, config_dir, "cookie_jar.json");
     }
 
     let override_manager = CertificateErrorOverrideManager::new();
@@ -532,16 +531,16 @@ impl ResourceChannelManager {
                 if let Some(ref config_dir) = self.config_dir {
                     match http_state.auth_cache.read() {
                         Ok(auth_cache) => {
-                            write_json_to_file(&*auth_cache, config_dir, "auth_cache.json")
+                            base::write_json_to_file(&*auth_cache, config_dir, "auth_cache.json")
                         },
                         Err(_) => warn!("Error writing auth cache to disk"),
                     }
                     match http_state.cookie_jar.read() {
-                        Ok(jar) => write_json_to_file(&*jar, config_dir, "cookie_jar.json"),
+                        Ok(jar) => base::write_json_to_file(&*jar, config_dir, "cookie_jar.json"),
                         Err(_) => warn!("Error writing cookie jar to disk"),
                     }
                     match http_state.hsts_list.read() {
-                        Ok(hsts) => write_json_to_file(&*hsts, config_dir, "hsts_list.json"),
+                        Ok(hsts) => base::write_json_to_file(&*hsts, config_dir, "hsts_list.json"),
                         Err(_) => warn!("Error writing hsts list to disk"),
                     }
                 }
@@ -554,49 +553,6 @@ impl ResourceChannelManager {
     }
 }
 
-pub fn read_json_from_file<T>(data: &mut T, config_dir: &Path, filename: &str)
-where
-    T: for<'de> Deserialize<'de>,
-{
-    let path = config_dir.join(filename);
-    let display = path.display();
-
-    let mut file = match File::open(&path) {
-        Err(why) => {
-            warn!("couldn't open {}: {}", display, why);
-            return;
-        },
-        Ok(file) => file,
-    };
-
-    let mut string_buffer: String = String::new();
-    match file.read_to_string(&mut string_buffer) {
-        Err(why) => panic!("couldn't read from {}: {}", display, why),
-        Ok(_) => trace!("successfully read from {}", display),
-    }
-
-    match serde_json::from_str(&string_buffer) {
-        Ok(decoded_buffer) => *data = decoded_buffer,
-        Err(why) => warn!("Could not decode buffer{}", why),
-    }
-}
-
-pub fn write_json_to_file<T>(data: &T, config_dir: &Path, filename: &str)
-where
-    T: Serialize,
-{
-    let path = config_dir.join(filename);
-    let display = path.display();
-
-    let mut file = match File::create(&path) {
-        Err(why) => panic!("couldn't create {}: {}", display, why),
-        Ok(file) => file,
-    };
-    let mut writer = BufWriter::new(&mut file);
-    serde_json::to_writer_pretty(&mut writer, data).expect("Could not serialize to file");
-    trace!("successfully wrote to {display}");
-}
-
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct AuthCacheEntry {
     pub user_name: String,