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use std::io::{ErrorKind, Read, Result, Write};
use ext::{ReadExt, WriteExt};
use tracing::{error, info_span};
use util::{ReadPktUntilFlush, WritePkt};
pub(crate) mod ext;
mod processor;
mod util;
pub use processor::*;
#[macro_export]
macro_rules! parse_error {
($e:expr) => {
std::io::Error::new(std::io::ErrorKind::InvalidData, $e)
};
}
pub struct GitFilterServer<P>(P);
impl<P> GitFilterServer<P> {
pub fn new(processor: P) -> Self {
Self(processor)
}
}
impl<P: Processor> GitFilterServer<P> {
fn communicate_internal<R: Read, W: Write>(
&mut self,
mut input: &mut R,
mut output: &mut W,
) -> Result<()> {
let mut buf = Vec::new();
{
if input.pkt_text_read(&mut buf)? != Some("git-filter-client") {
return Err(parse_error!("bad prelude"));
}
if input.pkt_text_read(&mut buf)? != Some("version=2") {
return Err(parse_error!("unknown version"));
}
if input.pkt_text_read(&mut buf)? != None {
return Err(parse_error!("unexpected text after client hello"));
}
}
{
output.pkt_text_write("git-filter-server")?;
output.pkt_text_write("version=2")?;
output.pkt_end()?;
}
{
let mut filter = false;
let mut smudge = false;
let mut delay = false;
while let Some(command) = input.pkt_text_read(&mut buf)? {
match command {
"capability=clean" => filter = true,
"capability=smudge" => smudge = true,
"capability=delay" => delay = true,
_ => {}
}
}
if filter && self.0.supports_processing(ProcessingType::Clean) {
output.pkt_text_write("capability=clean")?;
}
if smudge && self.0.supports_processing(ProcessingType::Smudge) {
output.pkt_text_write("capability=smudge")?;
}
if delay {
output.pkt_text_write("capability=delay")?;
}
output.pkt_end()?;
}
let mut waiting_for_blobs = false;
loop {
let mut command = None;
let mut pathname = None;
let mut can_delay = false;
while let Some(input) = input.pkt_text_read(&mut buf)? {
if let Some(command_val) = input.strip_prefix("command=") {
command = Some(command_val.to_owned());
} else if let Some(pathname_val) = input.strip_prefix("pathname=") {
pathname = Some(pathname_val.to_owned())
} else if input == "can-delay=1" {
can_delay = true;
}
}
let command = command.ok_or_else(|| parse_error!("missing command"))?;
let _span = info_span!("command", command = format_args!("{:?}", command),).entered();
match command.as_str() {
t @ "clean" | t @ "smudge" => {
let process_type = match t {
"clean" => ProcessingType::Clean,
"smudge" => ProcessingType::Smudge,
_ => unreachable!(),
};
let pathname = pathname.ok_or_else(|| parse_error!("missing pathname"))?;
let mut process_input = ReadPktUntilFlush::new(&mut input);
if waiting_for_blobs {
let _span = info_span!(
"resolving delayed",
pathname = format_args!("{}", pathname)
)
.entered();
let mut sink = [0; 1];
process_input
.read_exact(&mut sink)
.map_err(|_| parse_error!("delayed blob should have no data"))?;
assert!(process_input.finished());
output.pkt_text_write("status=success")?;
output.pkt_end()?;
let mut process_output = WritePkt::new(&mut output);
if let Err(e) =
self.0
.get_scheduled(&pathname, process_type, &mut process_output)
{
process_output.flush()?;
drop(process_output);
error!("{:#}", e);
output.pkt_end()?;
output.pkt_text_write("status=error")?;
output.pkt_end()?;
return Ok(());
} else {
process_output.flush()?;
drop(process_output);
output.pkt_end()?;
output.pkt_end()?;
}
} else if can_delay && self.0.should_delay(&pathname, process_type) {
let _span =
info_span!("scheduling", pathname = format_args!("{}", pathname))
.entered();
if let Err(e) =
self.0
.schedule_process(&pathname, process_type, &mut process_input)
{
error!("{:#}", e);
output.pkt_text_write("status=error")?;
output.pkt_end()?;
return Ok(());
} else {
output.pkt_text_write("status=delayed")?;
output.pkt_end()?;
}
} else {
let _span =
info_span!("processing", pathname = format_args!("{}", pathname))
.entered();
output.pkt_text_write("status=success")?;
output.pkt_end()?;
let mut process_output = WritePkt::new(&mut output);
if let Err(e) = self.0.process(
&pathname,
process_type,
&mut process_input,
&mut process_output,
) {
process_output.flush()?;
drop(process_output);
error!("{:#}", e);
output.pkt_end()?;
output.pkt_text_write("status=error")?;
output.pkt_end()?;
return Ok(());
} else {
process_output.flush()?;
drop(process_output);
output.pkt_end()?;
output.pkt_end()?;
}
}
assert!(process_input.finished());
}
"list_available_blobs" => {
self.0.switch_to_wait();
waiting_for_blobs = true;
}
cmd => return Err(parse_error!(format!("unknown command: {}", cmd))),
}
}
}
pub fn communicate<R: Read, W: Write>(&mut self, input: &mut R, output: &mut W) -> Result<()> {
match self.communicate_internal(input, output) {
Ok(_) => Ok(()),
Err(e) if e.kind() == ErrorKind::UnexpectedEof => Ok(()),
Err(e) => Err(e),
}
}
pub fn communicate_stdio(&mut self) -> Result<()> {
let stdin = std::io::stdin();
let stdout = std::io::stdout();
self.communicate(&mut stdin.lock(), &mut stdout.lock())?;
Ok(())
}
}