proxmox-backup/src/bin/backup-client.rs

135 lines
3.6 KiB
Rust
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extern crate apitest;
use failure::*;
use std::collections::HashMap;
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use std::fs::File;
use std::io::Read;
use std::io::ErrorKind;
use std::io::prelude::*;
use std::iter::Iterator;
use apitest::cli::command::*;
use apitest::api::schema::*;
use apitest::api::router::*;
use apitest::backup::chunk_store::*;
use serde_json::{json, Value};
use std::path::{Path, PathBuf};
use apitest::config::datastore;
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fn required_string_param<'a>(param: &'a Value, name: &str) -> &'a str {
param[name].as_str().expect(&format!("missing parameter '{}'", name))
}
// Note: We cannot implement an Iterator, because Iterators cannot
// return a borrowed buffer ref (we want zero-copy)
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fn file_chunker<C, R>(
mut file: R,
chunk_size: usize,
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chunk_cb: C
) -> Result<(), Error>
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where C: Fn(usize, &[u8]) -> Result<bool, Error>,
R: Read,
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{
const read_buffer_size: usize = 4*1024*1024; // 4M
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if chunk_size > read_buffer_size { bail!("chunk size too large!"); }
let mut buf = vec![0u8; read_buffer_size];
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let mut pos = 0;
let mut file_pos = 0;
loop {
let mut eof = false;
let mut tmp = &mut buf[..];
// try to read large portions, at least chunk_size
while pos < chunk_size {
match file.read(tmp) {
Ok(0) => { eof = true; break; },
Ok(n) => {
pos += n;
if pos > chunk_size { break; }
tmp = &mut tmp[n..];
}
Err(ref e) if e.kind() == ErrorKind::Interrupted => { /* try again */ }
Err(e) => bail!("read error - {}", e.to_string()),
}
}
println!("READ {} {}", pos, eof);
let mut start = 0;
while start + chunk_size <= pos {
if !(chunk_cb)(file_pos, &buf[start..start+chunk_size])? { break; }
file_pos += chunk_size;
start += chunk_size;
}
if eof {
if start < pos {
(chunk_cb)(file_pos, &buf[start..pos])?;
//file_pos += pos - start;
}
break;
} else {
let rest = pos - start;
if rest > 0 {
let ptr = buf.as_mut_ptr();
unsafe { std::ptr::copy_nonoverlapping(ptr.add(start), ptr, rest); }
pos = rest;
} else {
pos = 0;
}
}
}
Ok(())
}
fn backup_file(param: Value, _info: &ApiMethod) -> Result<Value, Error> {
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let filename = required_string_param(&param, "filename");
let store = required_string_param(&param, "store");
let config = datastore::config()?;
let (_, store_config) = config.sections.get(store)
.ok_or(format_err!("no such datastore '{}'", store))?;
let path = store_config["path"].as_str().unwrap();
let _store = ChunkStore::open(path)?;
println!("Backup file '{}' to '{}'", filename, store);
let file = std::fs::File::open(filename)?;
file_chunker(file, 64*1024, |pos, chunk| {
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println!("CHUNK {} {}", pos, chunk.len());
Ok(true)
})?;
Ok(Value::Null)
}
fn main() {
let cmd_def = CliCommand::new(
ApiMethod::new(
backup_file,
ObjectSchema::new("Create backup from file.")
.required("filename", StringSchema::new("Source file name."))
.required("store", StringSchema::new("Datastore name."))
))
.arg_param(vec!["filename"]);
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if let Err(err) = run_cli_command(&cmd_def.into()) {
eprintln!("Error: {}", err);
print_cli_usage();
std::process::exit(-1);
}
}