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use std::path::{PathBuf, Path};
use std::fs;
use std::env;
use serde_json;
use serde_json::{Value, json};
use crate::{
PlayerId,
RoomId,
savestate::SaveState,
playerstate::PlayerState,
Timestamp,
Result,
aerr
};
pub trait PersistentStorage {
fn load_room(&self, id: RoomId) -> Result<SaveState>;
fn load_player(&self, id: PlayerId) -> Result<PlayerState>;
fn load_world_meta(&self) -> Result<Timestamp>;
fn save_room(&self, id: RoomId, state: SaveState) -> Result<()>;
fn save_player(&self, id: PlayerId, sate: PlayerState) -> Result<()>;
fn save_world_meta(&self, time: Timestamp) -> Result<()>;
}
pub struct FileStorage {
directory: PathBuf
}
impl FileStorage {
pub fn new(path: PathBuf) -> Self {
Self {
directory: path
}
}
pub fn savedir() -> Option<PathBuf> {
if let Some(pathname) = env::var_os("ASCIIFARM_SAVE_DIR") {
Some(PathBuf::from(pathname))
} else if let Some(pathname) = env::var_os("XDG_DATA_HOME") {
let mut path = PathBuf::from(pathname);
path.push("asciifarm");
path.push("saves");
Some(path)
} else if let Some(pathname) = env::var_os("HOME") {
let mut path = PathBuf::from(pathname);
path.push(".asciifarm");
path.push("saves");
Some(path)
} else {
None
}
}
}
impl PersistentStorage for FileStorage {
fn load_room(&self, id: RoomId) -> Result<SaveState> {
let mut path = self.directory.clone();
path.push("rooms");
let fname = id.to_string() + ".save.json";
path.push(fname);
let text = fs::read_to_string(path)?;
let json: Value = serde_json::from_str(&text)?;
SaveState::from_json(&json)
}
fn load_player(&self, id: PlayerId) -> Result<PlayerState> {
let mut path = self.directory.clone();
path.push("players");
let fname = id.to_string() + ".save.json";
path.push(fname);
let text = fs::read_to_string(path)?;
let json: Value = serde_json::from_str(&text)?;
PlayerState::from_json(&json)
}
fn load_world_meta(&self) -> Result<Timestamp> {
let mut path = self.directory.clone();
path.push("world.save.json");
let text = fs::read_to_string(path)?;
let json: Value = serde_json::from_str(&text)?;
Ok(
Timestamp(
json
.get("steps").ok_or(aerr!("world data does not have steps"))?
.as_i64().ok_or(aerr!("timestamp not an int"))?
)
)
}
fn save_room(&self, id: RoomId, state: SaveState) -> Result<()> {
let mut path = self.directory.clone();
path.push("rooms");
fs::create_dir_all(&path)?;
let fname = id.to_string() + ".save.json";
path.push(fname);
let text = state.to_json().to_string();
write_file_safe(path, text)?;
Ok(())
}
fn save_player(&self, id: PlayerId, state: PlayerState) -> Result<()> {
let mut path = self.directory.clone();
path.push("players");
fs::create_dir_all(&path)?;
let fname = id.to_string() + ".save.json";
path.push(fname);
let text = state.to_json().to_string();
write_file_safe(path, text)?;
Ok(())
}
fn save_world_meta(&self, time: Timestamp) -> Result<()> {
let mut path = self.directory.clone();
fs::create_dir_all(&path)?;
path.push("world.save.json");
write_file_safe(path, json!({"steps": time.0}).to_string())?;
Ok(())
}
}
fn write_file_safe<P: AsRef<Path>, C: AsRef<[u8]>>(path: P, contents: C) -> Result<()> {
let temppath = path
.as_ref()
.with_file_name(
format!(
"tempfile_{}_{}.tmp",
path.as_ref().file_name().ok_or(aerr!("writing to directory"))?.to_str().unwrap_or("invalid"),
rand::random::<u64>()
)
);
fs::write(&temppath, contents)?;
fs::rename(&temppath, path)?;
Ok(())
}
|
