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// Read stdin, split into chunks, upload new chunks to chunk server.
use indicatif::{ProgressBar, ProgressStyle};
use log::{debug, error, info, trace};
use obnam::chunk::{DataChunk, GenerationChunk};
use obnam::chunkid::ChunkId;
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, thiserror::Error)]
enum ClientError {
#[error("Server successful response to creating chunk lacked chunk id")]
NoCreatedChunkId,
}
#[derive(Debug, StructOpt)]
#[structopt(name = "obnam-backup", about = "Simplistic backup client")]
struct Opt {
#[structopt(parse(from_os_str))]
config: PathBuf,
}
fn main() -> anyhow::Result<()> {
pretty_env_logger::init();
let opt = Opt::from_args();
let config = Config::read_config(&opt.config).unwrap();
// let pb = ProgressBar::new_spinner();
let pb = ProgressBar::new_spinner();
pb.set_style(
ProgressStyle::default_bar()
.template("backing up:\n{bytes} ({bytes_per_sec}) {elapsed} {msg} {spinner}"),
);
info!("obnam-backup starts up");
info!("config: {:?}", config);
let client = reqwest::blocking::Client::builder()
.danger_accept_invalid_certs(true)
.build()?;
let mut chunk_ids = vec![];
let mut total_bytes = 0;
let mut new_chunks = 0;
let mut dup_chunks = 0;
let mut new_bytes = 0;
let mut dup_bytes = 0;
let stdin = std::io::stdin();
let mut stdin = BufReader::new(stdin);
loop {
match read_chunk(&mut stdin)? {
None => break,
Some((meta, chunk)) => {
let n = chunk.data().len() as u64;
debug!("read {} bytes", n);
total_bytes += n;
pb.inc(n);
if let Some(chunk_id) = has_chunk(&client, &config, &meta)? {
debug!("dup chunk: {}", chunk_id);
chunk_ids.push(chunk_id);
dup_chunks += 1;
dup_bytes += n;
} else {
let chunk_id = upload_chunk(&client, &config, meta, chunk)?;
debug!("new chunk: {}", chunk_id);
chunk_ids.push(chunk_id);
new_chunks += 1;
new_bytes += n;
}
}
}
}
let gen = GenerationChunk::new(chunk_ids);
let gen_id = upload_gen(&client, &config, &gen)?;
pb.finish();
info!("read total {} bytes from stdin", total_bytes);
info!("duplicate bytes: {}", dup_bytes);
info!("duplicate chunks: {}", dup_chunks);
info!("new bytes: {}", new_bytes);
info!("new chunks: {}", new_chunks);
info!("total chunks: {}", gen.len());
info!("generation id: {}", gen_id);
info!("obnam-backup finished OK");
println!("backup OK: generation id: {}", gen_id);
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<ChunkId> {
let url = format!(
"http://{}:{}/chunks",
config.server_name, config.server_port
);
let res = client
.post(&url)
.header("chunk-meta", meta.to_json())
.body(chunk.data().to_vec())
.send()?;
debug!("upload_chunk: res={:?}", res);
let res: HashMap<String, String> = res.json()?;
let chunk_id = if let Some(chunk_id) = res.get("chunk_id") {
debug!("upload_chunk: id={}", chunk_id);
chunk_id.parse().unwrap()
} else {
return Err(ClientError::NoCreatedChunkId.into());
};
Ok(chunk_id)
}
fn upload_gen(
client: &reqwest::blocking::Client,
config: &Config,
gen: &GenerationChunk,
) -> anyhow::Result<ChunkId> {
let meta = ChunkMeta::new_generation("metasha", "ended-sometime");
let chunk = gen.to_data_chunk()?;
upload_chunk(client, config, meta, chunk)
}
fn has_chunk(
client: &reqwest::blocking::Client,
config: &Config,
meta: &ChunkMeta,
) -> anyhow::Result<Option<ChunkId>> {
let url = format!(
"http://{}:{}/chunks",
config.server_name, config.server_port,
);
trace!("has_chunk: url={:?}", url);
let req = client
.get(&url)
.query(&[("sha256", meta.sha256())])
.build()?;
let res = client.execute(req)?;
debug!("has_chunk: status={}", res.status());
let has = if res.status() != 200 {
debug!("has_chunk: error from server");
None
} else {
let text = res.text()?;
debug!("has_chunk: text={:?}", text);
let hits: HashMap<String, ChunkMeta> = serde_json::from_str(&text)?;
debug!("has_chunk: hits={:?}", hits);
let mut iter = hits.iter();
if let Some((chunk_id, _)) = iter.next() {
debug!("has_chunk: chunk_id={:?}", chunk_id);
Some(chunk_id.into())
} else {
None
}
};
Ok(has)
}
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