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|
// Read stdin, split into chunks, upload new chunks to chunk server.
use indicatif::{ProgressBar, ProgressStyle};
use obnam::chunk::DataChunk;
use obnam::chunkmeta::ChunkMeta;
use serde::Deserialize;
use sha2::{Digest, Sha256};
use std::collections::HashMap;
use std::io::prelude::*;
use std::io::BufReader;
use std::path::{Path, PathBuf};
use structopt::StructOpt;
const BUFFER_SIZE: usize = 1024 * 1024;
#[derive(Debug, StructOpt)]
#[structopt(name = "obnam-backup", about = "Simplistic backup client")]
struct Opt {
#[structopt(parse(from_os_str))]
config: PathBuf,
}
fn main() -> anyhow::Result<()> {
let opt = Opt::from_args();
let config = Config::read_config(&opt.config).unwrap();
let pb = ProgressBar::new_spinner();
pb.set_style(
ProgressStyle::default_bar()
.template("backing up:\n{bytes} ({bytes_per_sec}) {elapsed} {msg} {spinner}"),
);
println!("config: {:?}", config);
let client = reqwest::blocking::Client::builder()
.danger_accept_invalid_certs(true)
.build()?;
let stdin = std::io::stdin();
let mut stdin = BufReader::new(stdin);
let mut dup = 0;
loop {
match read_chunk(&mut stdin)? {
None => break,
Some((meta, chunk)) => {
let n = chunk.data().len() as u64;
if !has_chunk(&client, &config, &meta)? {
pb.inc(n);
upload_chunk(&client, &config, meta, chunk)?;
} else {
dup += n;
}
}
}
}
pb.finish();
println!(
"read total {} bytes from stdin ({} dup)",
pb.position(),
dup
);
Ok(())
}
#[derive(Debug, Deserialize, Clone)]
pub struct Config {
pub server_name: String,
pub server_port: u16,
}
impl Config {
pub fn read_config(filename: &Path) -> anyhow::Result<Config> {
let config = std::fs::read_to_string(filename)?;
let config: Config = serde_yaml::from_str(&config)?;
Ok(config)
}
}
fn read_chunk<H>(handle: &mut H) -> anyhow::Result<Option<(ChunkMeta, DataChunk)>>
where
H: Read + BufRead,
{
let mut buffer = [0; BUFFER_SIZE];
let mut used = 0;
loop {
let n = handle.read(&mut buffer[used..])?;
used += n;
if n == 0 || used == BUFFER_SIZE {
break;
}
}
if used == 0 {
return Ok(None);
}
let buffer = &buffer[..used];
let mut hasher = Sha256::new();
hasher.update(buffer);
let hash = hasher.finalize();
let hash = format!("{:x}", hash);
let meta = ChunkMeta::new(&hash);
let chunk = DataChunk::new(buffer.to_vec());
Ok(Some((meta, chunk)))
}
fn upload_chunk(
client: &reqwest::blocking::Client,
config: &Config,
meta: ChunkMeta,
chunk: DataChunk,
) -> anyhow::Result<()> {
let url = format!(
"http://{}:{}/chunks",
config.server_name, config.server_port
);
client
.post(&url)
.header("chunk-meta", meta.to_json())
.body(chunk.data().to_vec())
.send()?;
Ok(())
}
fn has_chunk(
client: &reqwest::blocking::Client,
config: &Config,
meta: &ChunkMeta,
) -> anyhow::Result<bool> {
let url = format!(
"http://{}:{}/chunks",
config.server_name, config.server_port,
);
let req = client
.get(&url)
.query(&[("sha256", meta.sha256())])
.build()?;
let res = client.execute(req)?;
let has = if res.status() != 200 {
false
} else {
let text = res.text()?;
let hits: HashMap<String, ChunkMeta> = serde_json::from_str(&text)?;
!hits.is_empty()
};
Ok(has)
}
|
