Add a few small snapshot tests (#2038)

* add manifest data test

* begin tests for io

* add unit tests for snapshot io

* service smoke test

* remove empty service module

ethcore/src/snapshot/io.rs

@@ -341,3 +341,91 @@ impl SnapshotReader for LooseReader {
 		Ok(buf)
 	}
 }
+
+#[cfg(test)]
+mod tests {
+	use devtools::RandomTempPath;
+	use util::sha3::Hashable;
+
+	use snapshot::ManifestData;
+	use super::{SnapshotWriter, SnapshotReader, PackedWriter, PackedReader, LooseWriter, LooseReader};
+
+	const STATE_CHUNKS: &'static [&'static [u8]] = &[b"dog", b"cat", b"hello world", b"hi", b"notarealchunk"];
+	const BLOCK_CHUNKS: &'static [&'static [u8]] = &[b"hello!", b"goodbye!", b"abcdefg", b"hijklmnop", b"qrstuvwxy", b"and", b"z"];
+
+	#[test]
+	fn packed_write_and_read() {
+		let path = RandomTempPath::new();
+		let mut writer = PackedWriter::new(path.as_path()).unwrap();
+
+		let mut state_hashes = Vec::new();
+		let mut block_hashes = Vec::new();
+
+		for chunk in STATE_CHUNKS {
+			let hash = chunk.sha3();
+			state_hashes.push(hash.clone());
+			writer.write_state_chunk(hash, chunk).unwrap();
+		}
+
+		for chunk in BLOCK_CHUNKS {
+			let hash = chunk.sha3();
+			block_hashes.push(hash.clone());
+			writer.write_block_chunk(chunk.sha3(), chunk).unwrap();
+		}
+
+		let manifest = ManifestData {
+			state_hashes: state_hashes,
+			block_hashes: block_hashes,
+			state_root: b"notarealroot".sha3(),
+			block_number: 12345678987654321,
+			block_hash: b"notarealblock".sha3(),
+		};
+
+		writer.finish(manifest.clone()).unwrap();
+
+		let reader = PackedReader::new(path.as_path()).unwrap().unwrap();
+		assert_eq!(reader.manifest(), &manifest);
+
+		for hash in manifest.state_hashes.iter().chain(&manifest.block_hashes) {
+			reader.chunk(hash.clone()).unwrap();
+		}
+	}
+
+	#[test]
+	fn loose_write_and_read() {
+		let path = RandomTempPath::new();
+		let mut writer = LooseWriter::new(path.as_path().into()).unwrap();
+
+		let mut state_hashes = Vec::new();
+		let mut block_hashes = Vec::new();
+
+		for chunk in STATE_CHUNKS {
+			let hash = chunk.sha3();
+			state_hashes.push(hash.clone());
+			writer.write_state_chunk(hash, chunk).unwrap();
+		}
+
+		for chunk in BLOCK_CHUNKS {
+			let hash = chunk.sha3();
+			block_hashes.push(hash.clone());
+			writer.write_block_chunk(chunk.sha3(), chunk).unwrap();
+		}
+
+		let manifest = ManifestData {
+			state_hashes: state_hashes,
+			block_hashes: block_hashes,
+			state_root: b"notarealroot".sha3(),
+			block_number: 12345678987654321,
+			block_hash: b"notarealblock".sha3(),
+		};
+
+		writer.finish(manifest.clone()).unwrap();
+
+		let reader = LooseReader::new(path.as_path().into()).unwrap();
+		assert_eq!(reader.manifest(), &manifest);
+
+		for hash in manifest.state_hashes.iter().chain(&manifest.block_hashes) {
+			reader.chunk(hash.clone()).unwrap();
+		}
+	}
+}

ethcore/src/snapshot/service.rs

@@ -40,7 +40,7 @@ use util::kvdb::{Database, DatabaseConfig};
 use util::snappy;
 
 /// Statuses for restorations.
-#[derive(PartialEq, Clone, Copy, Debug)]
+#[derive(PartialEq, Eq, Clone, Copy, Debug)]
 pub enum RestorationStatus {
 	///	No restoration.
 	Inactive,
@@ -519,3 +519,50 @@ impl SnapshotService for Service {
 			.expect("snapshot service and io service are kept alive by client service; qed");
 	}
 }
+
+#[cfg(test)]
+mod tests {
+	use service::ClientIoMessage;
+	use io::{IoService};
+	use devtools::RandomTempPath;
+	use tests::helpers::get_test_spec;
+	use util::journaldb::Algorithm;
+
+	use snapshot::ManifestData;
+	use super::*;
+
+	#[test]
+	fn sends_async_messages() {
+		let service = IoService::<ClientIoMessage>::start().unwrap();
+
+		let dir = RandomTempPath::new();
+		let mut dir = dir.as_path().to_owned();
+		dir.push("pruning");
+		dir.push("db");
+
+		let service = Service::new(
+			&get_test_spec(),
+			Algorithm::Archive,
+			dir,
+			service.channel()
+		).unwrap();
+
+		assert!(service.manifest().is_none());
+		assert!(service.chunk(Default::default()).is_none());
+		assert_eq!(service.status(), RestorationStatus::Inactive);
+		assert_eq!(service.chunks_done(), (0, 0));
+
+		let manifest = ManifestData {
+			state_hashes: vec![],
+			block_hashes: vec![],
+			state_root: Default::default(),
+			block_number: 0,
+			block_hash: Default::default(),
+		};
+
+		service.begin_restore(manifest);
+		service.abort_restore();
+		service.restore_state_chunk(Default::default(), vec![]);
+		service.restore_block_chunk(Default::default(), vec![]);
+	}
+}

ethcore/src/snapshot/tests/helpers.rs

@@ -78,7 +78,7 @@ impl StateProducer {
 		let new_accs = rng.gen::<u32>() % 5;
 
 		for _ in 0..new_accs {
-			let address_hash = H256::random();
+			let address_hash = H256(rng.gen());
 			let balance: usize = rng.gen();
 			let nonce: usize = rng.gen();
 			let acc = ::state::Account::new_basic(balance.into(), nonce.into()).rlp();

ethcore/src/snapshot/tests/mod.rs

@@ -20,3 +20,18 @@ mod blocks;
 mod state;
 
 pub mod helpers;
+
+use super::ManifestData;
+
+#[test]
+fn manifest_rlp() {
+	let manifest = ManifestData {
+		block_hashes: Vec::new(),
+		state_hashes: Vec::new(),
+		block_number: 1234567,
+		state_root: Default::default(),
+		block_hash: Default::default(),
+	};
+	let raw = manifest.clone().into_rlp();
+	assert_eq!(ManifestData::from_rlp(&raw).unwrap(), manifest);
+}

ethcore/src/snapshot/tests/state.rs

@@ -20,7 +20,7 @@ use snapshot::{chunk_state, Progress, StateRebuilder};
 use snapshot::io::{PackedReader, PackedWriter, SnapshotReader, SnapshotWriter};
 use super::helpers::{compare_dbs, StateProducer};
 
-use rand;
+use rand::{XorShiftRng, SeedableRng};
 use util::hash::H256;
 use util::journaldb::{self, Algorithm};
 use util::kvdb::{Database, DatabaseConfig};
@@ -33,7 +33,7 @@ use std::sync::Arc;
 #[test]
 fn snap_and_restore() {
 	let mut producer = StateProducer::new();
-	let mut rng = rand::thread_rng();
+	let mut rng = XorShiftRng::from_seed([1, 2, 3, 4]);
 	let mut old_db = MemoryDB::new();
 	let db_cfg = DatabaseConfig::with_columns(::db::NUM_COLUMNS);