137 lines
3.7 KiB
Rust
137 lines
3.7 KiB
Rust
// Key-value store using sled.
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use std::{
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fmt,
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fmt::{Display, Formatter},
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path::Path,
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};
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use log::{debug, info};
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use serde::{Deserialize, Serialize};
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use sled::{Batch, Db, IVec, Result, Tree};
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// The text and metadata of a Scuttlebutt root post.
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#[derive(Debug, Deserialize, Serialize)]
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pub struct Post {
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pub key: String,
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pub text: String,
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pub date: String,
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pub sequence: u64,
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pub read: bool,
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}
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#[derive(Debug, Clone, PartialEq, Eq)]
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struct IVecString {
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pub bytes: IVec,
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pub string: String,
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}
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impl Display for IVecString {
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fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
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write!(f, "{}", self.string)
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}
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}
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impl From<IVec> for IVecString {
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fn from(bytes: IVec) -> Self {
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Self {
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string: String::from_utf8_lossy(&bytes).into_owned(),
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bytes,
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}
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}
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}
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#[derive(Clone)]
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pub struct Database {
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/// Stores the sled database instance.
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db: Db,
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/// Stores the public keys of all the peers we are subscribed to.
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peer_tree: Tree,
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/// Stores the posts (content and metadata) for all the feeds we are subscribed to.
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pub post_tree: Tree,
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}
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impl Database {
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pub fn init(path: &Path) -> Self {
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// Open the database at the given path.
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// The database will be created if it does not yet exist.
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// This code will panic if an IO error is encountered.
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info!("initialising the sled database");
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let db = sled::open(path).expect("failed to open database");
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debug!("opening the 'peers' database tree");
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let peer_tree = db
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.open_tree("peers")
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.expect("failed to open database peers tree");
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debug!("opening the 'posts' database tree");
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let post_tree = db
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.open_tree("posts")
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.expect("failed to open database posts tree");
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Database {
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db,
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peer_tree,
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post_tree,
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}
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}
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pub fn add_peer(&self, public_key: &str) -> Result<Option<IVec>> {
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self.peer_tree.insert(&public_key, vec![0])
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}
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pub fn remove_peer(&self, public_key: &str) -> Result<Option<IVec>> {
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self.peer_tree.remove(&public_key)
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}
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pub fn get_peers(&self) -> Vec<String> {
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self.peer_tree
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.iter()
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.keys()
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.map(|bytes| IVecString::from(bytes.unwrap()))
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.map(|ivec_string| ivec_string.string)
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.collect()
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}
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pub fn insert_post(&self, public_key: &str, post: Post) -> Result<Option<IVec>> {
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let post_key = format!("{}_{}", public_key, post.key);
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let post_bytes = bincode::serialize(&post).unwrap();
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self.post_tree.insert(post_key.as_bytes(), post_bytes)
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}
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pub fn insert_post_batch(&self, public_key: &str, posts: Vec<Post>) -> Result<()> {
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let mut post_batch = Batch::default();
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for post in posts {
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let post_key = format!("{}_{}", public_key, post.key);
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let post_bytes = bincode::serialize(&post).unwrap();
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post_batch.insert(post_key.as_bytes(), post_bytes)
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}
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self.post_tree.apply_batch(post_batch)
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}
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pub fn get_posts(&self, public_key: &str) -> Result<Vec<Post>> {
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let mut posts = Vec::new();
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self.post_tree
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.scan_prefix(public_key.as_bytes())
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.map(|post| post.unwrap())
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.for_each(|post| posts.push(bincode::deserialize(&post.1).unwrap()));
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Ok(posts)
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}
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pub fn get_post(&self, public_key: &str, msg_id: &str) -> Result<Option<Post>> {
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let post_key = format!("{}_{}", public_key, msg_id);
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let post = self
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.post_tree
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.get(post_key.as_bytes())
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.unwrap()
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.map(|post| bincode::deserialize(&post).unwrap());
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Ok(post)
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}
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}
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