localstore 0.1.0

localstore
Documentation 
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use std::{
    collections::HashMap,
    error::Error,
    fs::{self, Permissions},
    os::{linux::fs::MetadataExt, unix::prelude::PermissionsExt},
    path::Path,
};

use crate::store::DigestString;
pub trait LabelstoreInterface {
    fn get(&self, digest: DigestString) -> Option<HashMap<String, String>>;
    fn set(&mut self, digest: DigestString, maps: HashMap<String, String>) -> Result<(), Box<dyn Error>>;
    fn update(
        &mut self,
        digest: DigestString,
        maps: HashMap<String, String>,
    ) -> Option<HashMap<String, String>>;
}

pub struct Labelstore {
    root: String,
    labels: HashMap<String, HashMap<String, String>>,
}

impl LabelstoreInterface for Labelstore {
    fn get(&self, digest: DigestString) -> Option<HashMap<String, String>> {
        //todo lock
        Some(self.labels[&digest].clone())
    }

    fn set(&mut self, digest: DigestString, maps: HashMap<String, String>) -> Result<(), Box<dyn Error>> {
        //todo lock
        self.labels.insert(digest, maps);

        Ok(())
    }

    fn update(
        &mut self,
        digest: DigestString,
        maps: HashMap<String, String>,
    ) -> Option<HashMap<String, String>> {
        if self.labels.get(&digest) == None {
            return None;
        }
        let mut mut_labels = self.labels.get(&digest).unwrap().clone();

        maps.iter().for_each(|(key, value)| {
            if value.is_empty() {
                mut_labels.remove(&key.clone());
            } else {
                mut_labels.insert(key.clone(), value.clone());
            }
        });
        self.labels.insert(digest.clone(), mut_labels.clone());
        Some(mut_labels)
    }
}

impl Labelstore {
    pub fn new(rt: String) -> Self {
        let ingest_path = Path::new(&rt).join("ingest").to_string_lossy().to_string();
        let _ = fs::create_dir_all(ingest_path.clone());
        if let Err(_) = fs::set_permissions(ingest_path, Permissions::from_mode(0o777)) {
            println!("create file error")
        }

        Labelstore {
            root: rt,
            labels: HashMap::default(),
        }
    }
}