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use bson::{decode_document, encode_document, Bson, Document};
use std::collections::HashMap;
use std::fs::{self, DirBuilder, File};
use std::io::prelude::*;
use std::io::Cursor;
use std::path::{Path, PathBuf};
pub mod config;
pub mod errors;
use config::*;
use errors::*;
const DEFAULT_CONFIG: &'static str = r#"project = ".default."
[core]
collection = ".default."
primary_key = "id"
data_path = ".default."
"#;
#[derive(Clone, Debug)]
pub struct Entry {
pub key: String,
pub content: String,
}
impl Entry {
pub fn as_bytes(&self) -> &[u8] {
self.content.as_bytes()
}
pub fn inner(&self) -> &str {
&self.content
}
pub fn _inner_mut(&mut self) -> &mut str {
&mut self.content
}
}
#[derive(Clone, Debug)]
pub struct Collection {
main_path: String,
config: Config,
cached_docs: HashMap<String, Entry>,
}
impl Collection {
fn _gen_key(&self, pk: &str) -> String {
let digest = md5::compute(pk);
format!("{}{:x}", self.config.coll_prefix(), digest)
}
pub fn get(&mut self, k: &str) -> Option<&Entry> {
let key = self._gen_key(k);
self._find(&key)
}
fn _find(&mut self, pk: &str) -> Option<&Entry> {
self.cache_entries();
self.cached_docs.get(pk)
}
fn _write_record(&self, entry: &str, key: &str) {
let mut doc = Document::new();
doc.insert("data".to_owned(), Bson::String(entry.to_owned()));
let mut buf = Vec::new();
encode_document(&mut buf, &doc).unwrap();
let mut file =
File::create(format!("{}/{}.bson", self.config.data_path(), key)).unwrap();
file.write_all(&buf).unwrap();
}
pub fn insert(&mut self, key: &str, entry: &str) -> Result<(), Errors> {
let k = self._gen_key(key);
match self._find(&k) {
Some(_) => Err(Errors::AlreadyExists),
None => {
self._write_record(entry, &k);
Ok(())
}
}
}
pub fn delete(&mut self, query: &str) -> Result<(), Errors>{
let k = self._gen_key(query);
return self._remove_entry(&k)
}
pub fn modify(&mut self, key: &str, new_entry: &str) -> Result<(), Errors> {
let k = self._gen_key(key);
match self._find(&k) {
None => Err(Errors::EntryNotFound),
Some(x) => {
self.delete(key).unwrap();
self.insert(key, new_entry).unwrap();
Ok(())
}
}
}
pub fn new(self, truncate: bool) -> Result<Collection, Errors> {
if truncate {
let path = generate_default_config_structure();
let config = Config::new_from_path(&path);
let main_path = String::from(path.parent().unwrap().to_str().unwrap());
DirBuilder::new()
.recursive(true)
.create(config.data_path())
.unwrap();
return Ok(Collection {
main_path,
config,
cached_docs: HashMap::new(),
})
} else {
let path = Path::new("db/keratin.toml");
let config = Config::new_from_path(&path);
let main_path = String::from(path.parent().unwrap().to_str().unwrap());
return Ok(Collection {
main_path,
config,
cached_docs: HashMap::new(),
})
}
Err(Errors::DbConfigurationError)
}
pub fn configure(path: Option<&str>) -> Collection {
let path = match path {
Some(x) => PathBuf::from(x),
None => {
generate_default_config_structure()
}
};
let config = Config::new_from_path(&path);
let main_path = String::from(path.parent().unwrap().to_str().unwrap());
DirBuilder::new()
.recursive(true)
.create(config.data_path())
.unwrap();
Collection {
main_path,
config,
cached_docs: HashMap::new(),
}
}
fn _remove_entry(&mut self, given_key: &str) -> Result<(), Errors>{
for entry in fs::read_dir(self.config.data_path()).unwrap() {
let fp = entry.unwrap().path();
let key = Path::new(&fp).file_stem().unwrap().to_str().unwrap().to_string();
if key == given_key {
fs::remove_file(fp).unwrap();
self.cached_docs.remove(given_key);
return Ok(())
}
}
Err(Errors::EntryNotFound)
}
pub fn cache_entries(&mut self) {
for entry in fs::read_dir(self.config.data_path()).unwrap() {
let fp = entry.unwrap().path();
let mut f = File::open(fp.clone()).unwrap();
let mut s = String::new();
f.read_to_string(&mut s).unwrap();
let key = Path::new(&fp).file_stem().unwrap().to_str().unwrap().to_string();
let doc = decode_document(&mut Cursor::new(&s)).expect("Could Not Decode");
let upd = doc.get("data").unwrap().as_str().unwrap().to_string();
let e = Entry {
key: key.clone(),
content: upd.clone()
};
self.cached_docs.insert(key, e);
}
}
}
fn generate_default_config_structure() -> PathBuf {
DirBuilder::new()
.recursive(true)
.create("db")
.unwrap();
let mut f = File::create("db/keratin.toml").unwrap();
f.write_all(DEFAULT_CONFIG.as_bytes()).unwrap();
Path::new("db/keratin.toml").to_owned()
}