Add diskstore module
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/*
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* Created on Wed Aug 05 2020
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*
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* This file is a part of the source code for the Terrabase database
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* Copyright (c) 2020, Sayan Nandan <ohsayan at outlook dot com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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use crate::coredb::Data;
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use bincode;
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use bytes::Bytes;
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use corelib::TResult;
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use std::collections::HashMap;
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use std::fs;
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use std::io::{ErrorKind, Write};
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use std::iter::FromIterator;
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type DiskStore = (Vec<String>, Vec<Vec<u8>>);
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/// Try to get the saved data from disk
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pub fn get_saved() -> TResult<Option<HashMap<String, Data>>> {
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let file = match fs::read("./data.bin") {
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Ok(f) => f,
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Err(e) => match e.kind() {
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ErrorKind::NotFound => return Ok(None),
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_ => return Err("Couldn't read flushed data from disk".into()),
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},
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};
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let parsed: DiskStore = bincode::deserialize(&file)?;
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let parsed: HashMap<String, Data> = HashMap::from_iter(
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parsed
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.0
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.into_iter()
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.zip(parsed.1.into_iter())
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.map(|(key, value)| {
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let data = Data::from_blob(Bytes::from(value));
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(key, data)
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}),
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);
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Ok(Some(parsed))
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}
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/// Flush the in-memory table onto disk
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pub fn flush_data(data: &HashMap<String, Data>) -> TResult<()> {
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let ds: DiskStore = (
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data.keys().into_iter().map(|val| val.to_string()).collect(),
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data.values().map(|val| val.get_blob().to_vec()).collect(),
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);
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let encoded = bincode::serialize(&ds)?;
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let mut file = fs::File::create("./data.bin")?;
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file.write_all(&encoded)?;
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Ok(())
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}
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