From 76694bfcf438088c9d74edc27840219623e0a88f Mon Sep 17 00:00:00 2001
From: Rob Walker <rob@solana.com>
Date: Tue, 6 Nov 2018 12:42:31 -0800
Subject: [PATCH] remove entry_writer.rs (#1720)

---
 src/bank.rs         |  36 ----------------
 src/entry_writer.rs | 102 --------------------------------------------
 src/lib.rs          |   1 -
 3 files changed, 139 deletions(-)
 delete mode 100644 src/entry_writer.rs

diff --git a/src/bank.rs b/src/bank.rs
index b69e929ad9..baff2a06a5 100644
--- a/src/bank.rs
+++ b/src/bank.rs
@@ -1487,14 +1487,12 @@ mod tests {
     use budget_program::BudgetState;
     use entry::next_entry;
     use entry::Entry;
-    use entry_writer::{self, EntryWriter};
     use hash::hash;
     use jsonrpc_macros::pubsub::{Subscriber, SubscriptionId};
     use ledger;
     use signature::Keypair;
     use signature::{GenKeys, KeypairUtil};
     use std;
-    use std::io::{BufReader, Cursor, Seek, SeekFrom};
     use system_transaction::SystemTransaction;
     use tokio::prelude::{Async, Stream};
     use transaction::Instruction;
@@ -1915,40 +1913,6 @@ mod tests {
         assert_eq!(bank.last_id(), last_id);
     }
 
-    // Write the given entries to a file and then return a file iterator to them.
-    fn to_file_iter(entries: impl Iterator<Item = Entry>) -> impl Iterator<Item = Entry> {
-        let mut file = Cursor::new(vec![]);
-        EntryWriter::write_entries(&mut file, entries).unwrap();
-        file.seek(SeekFrom::Start(0)).unwrap();
-
-        let reader = BufReader::new(file);
-        entry_writer::read_entries(reader).map(|x| x.unwrap())
-    }
-
-    #[test]
-    fn test_process_ledger_from_file() {
-        let (ledger, pubkey) = create_sample_ledger(1);
-        let ledger = to_file_iter(ledger);
-
-        let bank = Bank::default();
-        bank.process_ledger(ledger).unwrap();
-        assert_eq!(bank.get_balance(&pubkey), 1);
-    }
-
-    #[test]
-    fn test_process_ledger_from_files() {
-        let dummy_leader_id = Keypair::new().pubkey();
-        let dummy_leader_tokens = 1;
-        let mint = Mint::new_with_leader(2, dummy_leader_id, dummy_leader_tokens);
-
-        let genesis = to_file_iter(mint.create_entries().into_iter());
-        let block = to_file_iter(create_sample_block_with_ticks(&mint, 1, 1));
-
-        let bank = Bank::default();
-        bank.process_ledger(genesis.chain(block)).unwrap();
-        assert_eq!(bank.get_balance(&mint.pubkey()), 0);
-    }
-
     #[test]
     fn test_hash_internal_state() {
         let dummy_leader_id = Keypair::new().pubkey();
diff --git a/src/entry_writer.rs b/src/entry_writer.rs
deleted file mode 100644
index 851da94c2b..0000000000
--- a/src/entry_writer.rs
+++ /dev/null
@@ -1,102 +0,0 @@
-//! The `entry_writer` module helps implement the TPU's write stage. It
-//! writes entries to the given writer, which is typically a file or
-//! stdout, and then sends the Entry to its output channel.
-
-use bincode;
-use entry::Entry;
-use std::io::{self, BufRead, Error, ErrorKind, Write};
-use std::mem::size_of;
-
-pub struct EntryWriter {}
-
-impl EntryWriter {
-    fn write_entry<W: Write>(writer: &mut W, entry: &Entry) -> io::Result<()> {
-        let entry_bytes =
-            bincode::serialize(&entry).map_err(|e| Error::new(ErrorKind::Other, e.to_string()))?;
-
-        let len = entry_bytes.len();
-        let len_bytes =
-            bincode::serialize(&len).map_err(|e| Error::new(ErrorKind::Other, e.to_string()))?;
-
-        writer.write_all(&len_bytes[..])?;
-        writer.write_all(&entry_bytes[..])?;
-        writer.flush()
-    }
-
-    pub fn write_entries<W: Write, I>(writer: &mut W, entries: I) -> io::Result<()>
-    where
-        I: IntoIterator<Item = Entry>,
-    {
-        for entry in entries {
-            Self::write_entry(writer, &entry)?;
-        }
-        Ok(())
-    }
-}
-
-struct EntryReader<R: BufRead> {
-    reader: R,
-    entry_bytes: Vec<u8>,
-}
-
-impl<R: BufRead> Iterator for EntryReader<R> {
-    type Item = io::Result<Entry>;
-
-    fn next(&mut self) -> Option<io::Result<Entry>> {
-        let mut entry_len_bytes = [0u8; size_of::<usize>()];
-
-        if self.reader.read_exact(&mut entry_len_bytes[..]).is_ok() {
-            let entry_len = bincode::deserialize(&entry_len_bytes).unwrap();
-
-            if entry_len > self.entry_bytes.len() {
-                self.entry_bytes.resize(entry_len, 0);
-            }
-
-            if let Err(e) = self.reader.read_exact(&mut self.entry_bytes[..entry_len]) {
-                Some(Err(e))
-            } else {
-                Some(
-                    bincode::deserialize(&self.entry_bytes)
-                        .map_err(|e| Error::new(ErrorKind::Other, e.to_string())),
-                )
-            }
-        } else {
-            None // EOF (probably)
-        }
-    }
-}
-
-/// Return an iterator for all the entries in the given file.
-pub fn read_entries<R: BufRead>(reader: R) -> impl Iterator<Item = io::Result<Entry>> {
-    EntryReader {
-        reader,
-        entry_bytes: Vec::new(),
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use mint::Mint;
-    use std::io::Cursor;
-
-    /// Same as read_entries() but parsing a buffer and returning a vector.
-    fn read_entries_from_buf(s: &[u8]) -> io::Result<Vec<Entry>> {
-        let mut result = vec![];
-        let reader = Cursor::new(s);
-        for x in read_entries(reader) {
-            trace!("entry... {:?}", x);
-            result.push(x?);
-        }
-        Ok(result)
-    }
-
-    #[test]
-    fn test_read_entries_from_buf() {
-        let mint = Mint::new(1);
-        let mut buf = vec![];
-        EntryWriter::write_entries(&mut buf, mint.create_entries()).unwrap();
-        let entries = read_entries_from_buf(&buf).unwrap();
-        assert_eq!(entries, mint.create_entries());
-    }
-}
diff --git a/src/lib.rs b/src/lib.rs
index 5bde2c9291..7f2daa5b7d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -29,7 +29,6 @@ pub mod budget_program;
 pub mod compute_leader_finality_service;
 pub mod drone;
 pub mod entry;
-pub mod entry_writer;
 #[cfg(feature = "erasure")]
 pub mod erasure;
 pub mod fetch_stage;