pupoxide 0.2.3

A high-performance, memory-safe, declarative configuration management tool inspired by Puppet.
Documentation 
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use crate::domain::{Transaction, error::Result};
use anyhow::Context;
use std::fs;
use std::path::PathBuf;

pub struct StateStore {
    root: PathBuf,
}

impl StateStore {
    pub fn new(root: PathBuf) -> Self {
        Self { root }
    }

    fn get_transaction_path(&self, id: &str) -> PathBuf {
        self.root.join("transactions").join(format!("{}.json", id))
    }
}

impl crate::application::transaction::StateStore for StateStore {
    fn save_transaction(&self, transaction: &Transaction) -> Result<()> {
        let path = self.get_transaction_path(&transaction.id);
        if let Some(parent) = path.parent() {
            fs::create_dir_all(parent).context("Failed to create state dir")?;
        }
        let json =
            serde_json::to_string_pretty(transaction).context("Failed to serialize transaction")?;
        fs::write(path, json).context("Failed to write transaction")?;

        // Update 'latest' pointer
        let latest_path = self.root.join("latest_transaction");
        fs::write(latest_path, &transaction.id).context("Failed to update latest transaction")?;

        Ok(())
    }

    fn load_transaction(&self, id: &str) -> Result<Transaction> {
        let path = self.get_transaction_path(id);
        let json =
            fs::read_to_string(path).context(format!("Failed to read transaction {}", id))?;
        serde_json::from_str(&json).context("Failed to deserialize transaction")
    }

    fn load_latest_transaction(&self) -> Result<Transaction> {
        let latest_path = self.root.join("latest_transaction");
        let id = fs::read_to_string(latest_path).context("No previous transaction found")?;
        self.load_transaction(id.trim())
    }
}