Windows Compatibility Fixes #1 (#2535)

* initial changes for windows build and unit/integration tests

* rustfmt

* wallet+store tests

* rustfmt

* fix linux daemonize

* better encapsulate file rename

* rustfmt

* remove daemonize commands

* rustfmt

* remove server start/stop commands

* add ability to drop pmmr backend files explicitly for txhashset unzip

* rustfmt

* fix pmmr tests

* rustfmt

Cargo.toml

@@ -25,9 +25,7 @@ chrono = "0.4.4"
 clap = { version = "2.31", features = ["yaml"] }
 rpassword = "2.0.0"
 ctrlc = { version = "3.1", features = ["termination"] }
-cursive = "0.9.0"
 humansize = "1.1.0"
-daemonize = "0.3"
 serde = "1"
 serde_json = "1"
 log = "0.4"
@@ -45,6 +43,11 @@ grin_servers = { path = "./servers", version = "1.0.1" }
 grin_util = { path = "./util", version = "1.0.1" }
 grin_wallet = { path = "./wallet", version = "1.0.1" }
 
+[target.'cfg(windows)'.dependencies]
+cursive = { version = "0.10.0", default-features = false, features = ["pancurses-backend"] }
+[target.'cfg(unix)'.dependencies]
+cursive = "0.9.0"
+
 [build-dependencies]
 built = "0.3"
 reqwest = "0.9"

chain/src/chain.rs

@@ -857,6 +857,14 @@ impl Chain {
 		}
 
 		let header = self.get_block_header(&h)?;
+
+		{
+			let mut txhashset_ref = self.txhashset.write();
+			// Drop file handles in underlying txhashset
+			txhashset_ref.release_backend_files();
+		}
+
+		// Rewrite hashset
 		txhashset::zip_write(self.db_root.clone(), txhashset_data, &header)?;
 
 		let mut txhashset =

chain/src/txhashset/txhashset.rs

@@ -18,7 +18,7 @@
 use crate::core::core::committed::Committed;
 use crate::core::core::hash::{Hash, Hashed};
 use crate::core::core::merkle_proof::MerkleProof;
-use crate::core::core::pmmr::{self, ReadonlyPMMR, RewindablePMMR, PMMR};
+use crate::core::core::pmmr::{self, Backend, ReadonlyPMMR, RewindablePMMR, PMMR};
 use crate::core::core::{
 	Block, BlockHeader, Input, Output, OutputIdentifier, TxKernel, TxKernelEntry,
 };
@@ -153,6 +153,15 @@ impl TxHashSet {
 		})
 	}
 
+	/// Close all backend file handles
+	pub fn release_backend_files(&mut self) {
+		self.header_pmmr_h.backend.release_files();
+		self.sync_pmmr_h.backend.release_files();
+		self.output_pmmr_h.backend.release_files();
+		self.rproof_pmmr_h.backend.release_files();
+		self.kernel_pmmr_h.backend.release_files();
+	}
+
 	/// Check if an output is unspent.
 	/// We look in the index to find the output MMR pos.
 	/// Then we check the entry in the output MMR and confirm the hash matches.

core/Cargo.toml

@@ -12,7 +12,7 @@ edition = "2018"
 [dependencies]
 blake2-rfc = "0.2"
 byteorder = "1"
-croaring = "=0.3"
+croaring = "=0.3.8"
 enum_primitive = "0.1"
 failure = "0.1"
 failure_derive = "0.1"

core/src/core/pmmr/backend.rs

@@ -62,6 +62,9 @@ pub trait Backend<T: PMMRable> {
 	/// fastest way to to be able to allow direct access to the file
 	fn get_data_file_path(&self) -> &Path;
 
+	/// Release underlying datafiles and locks
+	fn release_files(&mut self);
+
 	/// Also a bit of a hack...
 	/// Saves a snapshot of the rewound utxo file with the block hash as
 	/// filename suffix. We need this when sending a txhashset zip file to a

core/tests/vec_backend.rs

@@ -122,6 +122,8 @@ impl<T: PMMRable> Backend<T> for VecBackend<T> {
 		Path::new("")
 	}
 
+	fn release_files(&mut self) {}
+
 	fn dump_stats(&self) {}
 }
 

src/bin/cmd/server.rs

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 /// Grin server commands processing
+#[cfg(not(target_os = "windows"))]
 use std::env::current_dir;
 use std::process::exit;
 use std::sync::atomic::{AtomicBool, Ordering};
@@ -22,7 +23,6 @@ use std::time::Duration;
 
 use clap::ArgMatches;
 use ctrlc;
-use daemonize::Daemonize;
 
 use crate::config::GlobalConfig;
 use crate::core::global;
@@ -31,7 +31,7 @@ use crate::servers;
 use crate::tui::ui;
 
 /// wrap below to allow UI to clean up on stop
-fn start_server(config: servers::ServerConfig) {
+pub fn start_server(config: servers::ServerConfig) {
 	start_server_tui(config);
 	// Just kill process for now, otherwise the process
 	// hangs around until sigint because the API server
@@ -157,29 +157,11 @@ pub fn server_command(
 			});
 	}*/
 
-	// start the server in the different run modes (interactive or daemon)
 	if let Some(a) = server_args {
 		match a.subcommand() {
 			("run", _) => {
 				start_server(server_config);
 			}
-			("start", _) => {
-				let daemonize = Daemonize::new()
-					.pid_file("/tmp/grin.pid")
-					.chown_pid_file(true)
-					.working_directory(current_dir().unwrap())
-					.privileged_action(move || {
-						start_server(server_config.clone());
-						loop {
-							thread::sleep(Duration::from_secs(60));
-						}
-					});
-				match daemonize.start() {
-					Ok(_) => info!("Grin server successfully started."),
-					Err(e) => error!("Error starting: {}", e),
-				}
-			}
-			("stop", _) => println!("TODO. Just 'kill $pid' for now. Maybe /tmp/grin.pid is $pid"),
 			("", _) => {
 				println!("Subcommand required, use 'grin help server' for details");
 			}

src/bin/grin.yml

@@ -44,10 +44,6 @@ subcommands:
       subcommands:
         - config:
             about: Generate a configuration grin-server.toml file in the current directory
-        - start:
-            about: Start the Grin server as a daemon
-        - stop:
-            about: Stop the Grin server daemon
         - run:
             about: Run the Grin server in this console
   - client:

store/Cargo.toml

@@ -11,7 +11,7 @@ edition = "2018"
 
 [dependencies]
 byteorder = "1"
-croaring = "=0.3"
+croaring = "=0.3.8"
 env_logger = "0.5"
 libc = "0.2"
 failure = "0.1"

store/src/lmdb.rs

@@ -73,11 +73,19 @@ pub fn new_named_env(path: String, name: String, max_readers: Option<u32>) -> lm
 	env_builder.set_maxdbs(8).unwrap();
 	// half a TB should give us plenty room, will be an issue on 32 bits
 	// (which we don't support anyway)
-	env_builder
-		.set_mapsize(549_755_813_888)
-		.unwrap_or_else(|e| {
-			panic!("Unable to allocate LMDB space: {:?}", e);
-		});
+
+	#[cfg(not(target_os = "windows"))]
+	env_builder.set_mapsize(5_368_709_120).unwrap_or_else(|e| {
+		panic!("Unable to allocate LMDB space: {:?}", e);
+	});
+	//TODO: This is temporary to support (beta) windows support
+	//Windows allocates the entire file at once, so this needs to
+	//be changed to allocate as little as possible and increase as needed
+	#[cfg(target_os = "windows")]
+	env_builder.set_mapsize(524_288_000).unwrap_or_else(|e| {
+		panic!("Unable to allocate LMDB space: {:?}", e);
+	});
+
 	if let Some(max_readers) = max_readers {
 		env_builder
 			.set_maxreaders(max_readers)

store/src/pmmr.rs

@@ -152,6 +152,12 @@ impl<T: PMMRable> Backend<T> for PMMRBackend<T> {
 		self.data_file.path()
 	}
 
+	/// Release underlying data files
+	fn release_files(&mut self) {
+		self.data_file.release();
+		self.hash_file.release();
+	}
+
 	fn snapshot(&self, header: &BlockHeader) -> Result<(), String> {
 		self.leaf_set
 			.snapshot(header)
@@ -208,8 +214,8 @@ impl<T: PMMRable> PMMRBackend<T> {
 		Ok(PMMRBackend {
 			data_dir: data_dir.to_path_buf(),
 			prunable,
-			hash_file,
-			data_file,
+			hash_file: hash_file,
+			data_file: data_file,
 			leaf_set,
 			prune_list,
 		})
@@ -334,20 +340,11 @@ impl<T: PMMRable> PMMRBackend<T> {
 			}
 			self.prune_list.flush()?;
 		}
-
 		// 4. Rename the compact copy of hash file and reopen it.
-		fs::rename(
-			tmp_prune_file_hash.clone(),
-			self.data_dir.join(PMMR_HASH_FILE),
-		)?;
-		self.hash_file = DataFile::open(self.data_dir.join(PMMR_HASH_FILE))?;
+		self.hash_file.replace(Path::new(&tmp_prune_file_hash))?;
 
 		// 5. Rename the compact copy of the data file and reopen it.
-		fs::rename(
-			tmp_prune_file_data.clone(),
-			self.data_dir.join(PMMR_DATA_FILE),
-		)?;
-		self.data_file = DataFile::open(self.data_dir.join(PMMR_DATA_FILE))?;
+		self.data_file.replace(Path::new(&tmp_prune_file_data))?;
 
 		// 6. Write the leaf_set to disk.
 		// Optimize the bitmap storage in the process.

store/src/types.rs

@@ -101,6 +101,17 @@ where
 		self.file.path()
 	}
 
+	/// Replace underlying file with another, deleting original
+	pub fn replace(&mut self, with: &Path) -> io::Result<()> {
+		self.file.replace(with)?;
+		Ok(())
+	}
+
+	/// Drop underlying file handles
+	pub fn release(&mut self) {
+		self.file.release();
+	}
+
 	/// Write the file out to disk, pruning removed elements.
 	pub fn save_prune<F>(&self, target: &str, prune_offs: &[u64], prune_cb: F) -> io::Result<()>
 	where
@@ -125,7 +136,7 @@ where
 /// latter by truncating the underlying file and re-creating the mmap.
 pub struct AppendOnlyFile {
 	path: PathBuf,
-	file: File,
+	file: Option<File>,
 	mmap: Option<memmap::Mmap>,
 	buffer_start: usize,
 	buffer: Vec<u8>,
@@ -135,26 +146,34 @@ pub struct AppendOnlyFile {
 impl AppendOnlyFile {
 	/// Open a file (existing or not) as append-only, backed by a mmap.
 	pub fn open<P: AsRef<Path>>(path: P) -> io::Result<AppendOnlyFile> {
-		let file = OpenOptions::new()
-			.read(true)
-			.append(true)
-			.create(true)
-			.open(&path)?;
 		let mut aof = AppendOnlyFile {
-			file,
+			file: None,
 			path: path.as_ref().to_path_buf(),
 			mmap: None,
 			buffer_start: 0,
 			buffer: vec![],
 			buffer_start_bak: 0,
 		};
+		aof.init()?;
+		Ok(aof)
+	}
+
+	/// (Re)init an underlying file and its associated memmap
+	pub fn init(&mut self) -> io::Result<()> {
+		self.file = Some(
+			OpenOptions::new()
+				.read(true)
+				.append(true)
+				.create(true)
+				.open(self.path.clone())?,
+		);
 		// If we have a non-empty file then mmap it.
-		let sz = aof.size();
+		let sz = self.size();
 		if sz > 0 {
-			aof.buffer_start = sz as usize;
-			aof.mmap = Some(unsafe { memmap::Mmap::map(&aof.file)? });
+			self.buffer_start = sz as usize;
+			self.mmap = Some(unsafe { memmap::Mmap::map(&self.file.as_ref().unwrap())? });
 		}
-		Ok(aof)
+		Ok(())
 	}
 
 	/// Append data to the file. Until the append-only file is synced, data is
@@ -193,21 +212,37 @@ impl AppendOnlyFile {
 	pub fn flush(&mut self) -> io::Result<()> {
 		if self.buffer_start_bak > 0 {
 			// Flushing a rewound state, we need to truncate via set_len() before applying.
-			self.file.set_len(self.buffer_start as u64)?;
+			// Drop and recreate, or windows throws an access error
+			self.mmap = None;
+			self.file = None;
+			{
+				let file = OpenOptions::new()
+					.read(true)
+					.create(true)
+					.write(true)
+					.open(&self.path)?;
+				file.set_len(self.buffer_start as u64)?;
+			}
+			let file = OpenOptions::new()
+				.read(true)
+				.create(true)
+				.append(true)
+				.open(&self.path)?;
+			self.file = Some(file);
 			self.buffer_start_bak = 0;
 		}
 
 		self.buffer_start += self.buffer.len();
-		self.file.write_all(&self.buffer[..])?;
-		self.file.sync_all()?;
+		self.file.as_mut().unwrap().write_all(&self.buffer[..])?;
+		self.file.as_mut().unwrap().sync_all()?;
 
 		self.buffer = vec![];
 
 		// Note: file must be non-empty to memory map it
-		if self.file.metadata()?.len() == 0 {
+		if self.file.as_ref().unwrap().metadata()?.len() == 0 {
 			self.mmap = None;
 		} else {
-			self.mmap = Some(unsafe { memmap::Mmap::map(&self.file)? });
+			self.mmap = Some(unsafe { memmap::Mmap::map(&self.file.as_ref().unwrap())? });
 		}
 
 		Ok(())
@@ -313,6 +348,23 @@ impl AppendOnlyFile {
 		}
 	}
 
+	/// Replace the underlying file with another file
+	/// deleting the original
+	pub fn replace(&mut self, with: &Path) -> io::Result<()> {
+		self.mmap = None;
+		self.file = None;
+		fs::remove_file(&self.path)?;
+		fs::rename(with, &self.path)?;
+		self.init()?;
+		Ok(())
+	}
+
+	/// Release underlying file handles
+	pub fn release(&mut self) {
+		self.mmap = None;
+		self.file = None;
+	}
+
 	/// Current size of the file in bytes.
 	pub fn size(&self) -> u64 {
 		fs::metadata(&self.path).map(|md| md.len()).unwrap_or(0)