83 lines
2.6 KiB
Rust
83 lines
2.6 KiB
Rust
//! The `entry_writer` module helps implement the TPU's write stage. It
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//! writes entries to the given writer, which is typically a file or
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//! stdout, and then sends the Entry to its output channel.
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use bank::Bank;
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use entry::Entry;
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use ledger::Block;
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use packet;
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use result::Result;
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use serde_json;
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use std::collections::VecDeque;
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use std::io::sink;
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use std::io::Write;
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use std::sync::mpsc::Receiver;
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use std::sync::{Arc, Mutex};
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use std::time::Duration;
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use streamer;
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pub struct EntryWriter<'a> {
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bank: &'a Bank,
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}
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impl<'a> EntryWriter<'a> {
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/// Create a new Tpu that wraps the given Bank.
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pub fn new(bank: &'a Bank) -> Self {
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EntryWriter { bank }
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}
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fn write_entry<W: Write>(&self, writer: &Mutex<W>, entry: &Entry) {
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trace!("write_entry entry");
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self.bank.register_entry_id(&entry.id);
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writeln!(
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writer.lock().expect("'writer' lock in fn fn write_entry"),
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"{}",
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serde_json::to_string(&entry).expect("'entry' to_strong in fn write_entry")
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).expect("writeln! in fn write_entry");
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}
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fn write_entries<W: Write>(
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&self,
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writer: &Mutex<W>,
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entry_receiver: &Receiver<Entry>,
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) -> Result<Vec<Entry>> {
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//TODO implement a serialize for channel that does this without allocations
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let mut l = vec![];
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let entry = entry_receiver.recv_timeout(Duration::new(1, 0))?;
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self.write_entry(writer, &entry);
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l.push(entry);
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while let Ok(entry) = entry_receiver.try_recv() {
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self.write_entry(writer, &entry);
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l.push(entry);
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}
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Ok(l)
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}
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/// Process any Entry items that have been published by the Historian.
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/// continuosly broadcast blobs of entries out
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pub fn write_and_send_entries<W: Write>(
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&self,
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broadcast: &streamer::BlobSender,
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blob_recycler: &packet::BlobRecycler,
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writer: &Mutex<W>,
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entry_receiver: &Receiver<Entry>,
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) -> Result<()> {
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let mut q = VecDeque::new();
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let list = self.write_entries(writer, entry_receiver)?;
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trace!("New blobs? {}", list.len());
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list.to_blobs(blob_recycler, &mut q);
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if !q.is_empty() {
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trace!("broadcasting {}", q.len());
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broadcast.send(q)?;
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}
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Ok(())
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}
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/// Process any Entry items that have been published by the Historian.
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/// continuosly broadcast blobs of entries out
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pub fn drain_entries(&self, entry_receiver: &Receiver<Entry>) -> Result<()> {
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self.write_entries(&Arc::new(Mutex::new(sink())), entry_receiver)?;
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Ok(())
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}
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}
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