Some unit tests and proptests

.gitignore

@@ -2,3 +2,5 @@
 /target/
 # Firebase caches (?)
 .firebase/
+# Emacs detritus
+*~

zebra-chain/proptest-regressions/block/tests.txt

@@ -0,0 +1,7 @@
+# Seeds for failure cases proptest has generated in the past. It is
+# automatically read and these particular cases re-run before any
+# novel cases are generated.
+#
+# It is recommended to check this file in to source control so that
+# everyone who runs the test benefits from these saved cases.
+cc 1fcf1e08caccdafad9c9f51c46cd24b992cf7207f55cae605a54830868527baa # shrinks to header = BlockHeader { previous_block_hash: BlockHeaderHash("0000000000000000000000000000000000000000000000000000000000000000"), merkle_root_hash: MerkleTreeRootHash([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]), final_sapling_root_hash: SaplingNoteTreeRootHash([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]), time: 1969-12-31T23:59:59Z, bits: 0, nonce: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], solution: EquihashSolution("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") }

zebra-chain/src/block.rs

@@ -1,9 +1,19 @@
 //! Definitions of block datastructures.
 
-use chrono::{DateTime, Utc};
+#[cfg(test)]
+pub mod test_vectors;
+#[cfg(test)]
+mod tests;
+
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+use chrono::{DateTime, TimeZone, Utc};
 use hex;
 use std::{fmt, io};
 
+#[cfg(test)]
+use proptest_derive::Arbitrary;
+
+use crate::equihash_solution::EquihashSolution;
 use crate::merkle_tree::MerkleTreeRootHash;
 use crate::note_commitment_tree::SaplingNoteTreeRootHash;
 use crate::serialization::{ReadZcashExt, SerializationError, ZcashDeserialize, ZcashSerialize};
@@ -23,6 +33,7 @@ use crate::transaction::Transaction;
 /// for now I want to call it a `BlockHeaderHash` because that's
 /// more explicit.
 #[derive(Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(test, derive(Arbitrary))]
 pub struct BlockHeaderHash(pub [u8; 32]);
 
 impl fmt::Debug for BlockHeaderHash {
@@ -52,8 +63,7 @@ impl ZcashSerialize for BlockHeaderHash {
 
 impl ZcashDeserialize for BlockHeaderHash {
     fn zcash_deserialize<R: io::Read>(mut reader: R) -> Result<Self, SerializationError> {
-        let bytes = reader.read_32_bytes()?;
-        Ok(BlockHeaderHash(bytes))
+        Ok(BlockHeaderHash(reader.read_32_bytes()?))
     }
 }
 
@@ -63,7 +73,7 @@ impl ZcashDeserialize for BlockHeaderHash {
 /// backwards reference (previous header hash) present in the block
 /// header. Each block points backwards to its parent, all the way
 /// back to the genesis block (the first block in the blockchain).
-#[derive(Clone, Debug, Eq, PartialEq)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub struct BlockHeader {
     /// A SHA-256d hash in internal byte order of the previous block’s
     /// header. This ensures no previous block can be changed without
@@ -104,22 +114,42 @@ pub struct BlockHeader {
     nonce: [u8; 32],
 
     /// The Equihash solution.
-    // The solution size when serialized should be in bytes ('always
-    // 1344').  I first tried this as a [u8; 1344] but until const
-    // generics land we'd have to implement all our common traits
-    // manually, like in pzec.
-    solution: Vec<u8>,
+    solution: EquihashSolution,
 }
 
 impl ZcashSerialize for BlockHeader {
-    fn zcash_serialize<W: io::Write>(&self, _writer: W) -> Result<(), SerializationError> {
-        unimplemented!();
+    fn zcash_serialize<W: io::Write>(&self, mut writer: W) -> Result<(), SerializationError> {
+        // "The current and only defined block version number for Zcash is 4."
+        writer.write_u32::<LittleEndian>(4)?;
+        self.previous_block_hash.zcash_serialize(&mut writer)?;
+        writer.write_all(&self.merkle_root_hash.0[..])?;
+        writer.write_all(&self.final_sapling_root_hash.0[..])?;
+        writer.write_u32::<LittleEndian>(self.time.timestamp() as u32)?;
+        writer.write_u32::<LittleEndian>(self.bits)?;
+        writer.write_all(&self.nonce[..])?;
+        self.solution.zcash_serialize(&mut writer)?;
+        Ok(())
     }
 }
 
 impl ZcashDeserialize for BlockHeader {
-    fn zcash_deserialize<R: io::Read>(_reader: R) -> Result<Self, SerializationError> {
-        unimplemented!();
+    fn zcash_deserialize<R: io::Read>(mut reader: R) -> Result<Self, SerializationError> {
+        // "The current and only defined block version number for Zcash is 4."
+        let version = reader.read_u32::<LittleEndian>()?;
+
+        if version != 4 {
+            return Err(SerializationError::Parse("bad block header"));
+        }
+
+        Ok(BlockHeader {
+            previous_block_hash: BlockHeaderHash::zcash_deserialize(&mut reader)?,
+            merkle_root_hash: MerkleTreeRootHash(reader.read_32_bytes()?),
+            final_sapling_root_hash: SaplingNoteTreeRootHash(reader.read_32_bytes()?),
+            time: Utc.timestamp(reader.read_u32::<LittleEndian>()? as i64, 0),
+            bits: reader.read_u32::<LittleEndian>()?,
+            nonce: reader.read_32_bytes()?,
+            solution: EquihashSolution::zcash_deserialize(reader)?,
+        })
     }
 }
 
@@ -130,6 +160,7 @@ impl ZcashDeserialize for BlockHeader {
 /// Block header: a data structure containing the block's metadata
 /// Transactions: an array (vector in Rust) of transactions
 #[derive(Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(test, derive(Arbitrary))]
 pub struct Block {
     /// First 80 bytes of the block as defined by the encoding used by
     /// "block" messages.
@@ -140,37 +171,18 @@ pub struct Block {
 }
 
 impl ZcashSerialize for Block {
-    fn zcash_serialize<W: io::Write>(&self, _writer: W) -> Result<(), SerializationError> {
-        unimplemented!();
+    fn zcash_serialize<W: io::Write>(&self, mut writer: W) -> Result<(), SerializationError> {
+        self.header.zcash_serialize(&mut writer)?;
+        self.transactions.zcash_serialize(&mut writer)?;
+        Ok(())
     }
 }
 
 impl ZcashDeserialize for Block {
-    fn zcash_deserialize<R: io::Read>(_reader: R) -> Result<Self, SerializationError> {
-        unimplemented!();
-    }
-}
-
-#[cfg(test)]
-mod tests {
-
-    use std::io::Write;
-
-    use super::BlockHeaderHash;
-
-    use crate::sha256d_writer::Sha256dWriter;
-
-    #[test]
-    fn blockheaderhash_debug() {
-        let preimage = b"foo bar baz";
-        let mut sha_writer = Sha256dWriter::default();
-        let _ = sha_writer.write_all(preimage);
-
-        let hash = BlockHeaderHash(sha_writer.finish());
-
-        assert_eq!(
-            format!("{:?}", hash),
-            "BlockHeaderHash(\"bf46b4b5030752fedac6f884976162bbfb29a9398f104a280b3e34d51b416631\")"
-        );
+    fn zcash_deserialize<R: io::Read>(mut reader: R) -> Result<Self, SerializationError> {
+        Ok(Block {
+            header: BlockHeader::zcash_deserialize(&mut reader)?,
+            transactions: Vec::zcash_deserialize(&mut reader)?,
+        })
     }
 }

zebra-chain/src/block/test_vectors.rs

@@ -0,0 +1,98 @@
+// Copied from librustzcash
+// From mainnet block 415000.
+// https://explorer.zcha.in/blocks/415000
+pub const HEADER_MAINNET_415000: [u8; 1487] = [
+    0x04, 0x00, 0x00, 0x00, 0x52, 0x74, 0xb4, 0x3b, 0x9e, 0x4a, 0xd8, 0xf4, 0x3e, 0x93, 0xf7, 0x84,
+    0x63, 0xd2, 0x4d, 0xcf, 0xe5, 0x31, 0xae, 0xb4, 0x71, 0x98, 0x19, 0xf4, 0xf9, 0x7f, 0x7e, 0x03,
+    0x00, 0x00, 0x00, 0x00, 0x66, 0x30, 0x73, 0xbc, 0x4b, 0xfa, 0x95, 0xc9, 0xbe, 0xc3, 0x6a, 0xad,
+    0x72, 0x68, 0xa5, 0x73, 0x04, 0x97, 0x97, 0xbd, 0xfc, 0x5a, 0xa4, 0xc7, 0x43, 0xfb, 0xe4, 0x82,
+    0x0a, 0xa3, 0x93, 0xce, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0xa8, 0xbe, 0xcc, 0x5b, 0xe1, 0xab, 0x03, 0x1c, 0xc2, 0xfd, 0x60, 0x7c,
+    0x77, 0x6a, 0x7a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3e, 0xb2, 0x18, 0x19, 0xfd, 0x40, 0x05, 0x00,
+    0x94, 0x9d, 0x55, 0xde, 0x0c, 0xc6, 0x33, 0xe0, 0xcc, 0xe4, 0x1e, 0x46, 0x49, 0xef, 0x4a, 0xa3,
+    0x34, 0x9f, 0x01, 0x00, 0x29, 0x0f, 0xfe, 0x28, 0x1b, 0x94, 0x7b, 0x3b, 0x53, 0xfb, 0xd2, 0xf3,
+    0x5b, 0x1c, 0xe2, 0x92, 0x64, 0x9b, 0x96, 0xac, 0x6e, 0x08, 0x83, 0xaf, 0x3a, 0x68, 0x44, 0xb9,
+    0x55, 0x92, 0xe7, 0x45, 0x56, 0xda, 0x34, 0x4b, 0x47, 0x01, 0x96, 0x1c, 0xd4, 0x13, 0x0c, 0x68,
+    0x21, 0x9c, 0xfa, 0x13, 0x41, 0xd5, 0xaf, 0xb5, 0x04, 0x9e, 0xb0, 0xe8, 0xbe, 0x4a, 0x2d, 0x92,
+    0xd6, 0x78, 0xc4, 0x07, 0x85, 0xe3, 0x37, 0x05, 0x54, 0x8b, 0x5f, 0x3a, 0x54, 0xf0, 0xa4, 0xc3,
+    0x9a, 0x2f, 0x58, 0xee, 0x78, 0x4a, 0x24, 0x16, 0x3c, 0xd8, 0x6f, 0x54, 0x81, 0x23, 0x27, 0xdf,
+    0x55, 0xe1, 0xd5, 0x5c, 0xa8, 0x4b, 0x6e, 0x7b, 0x88, 0x7a, 0x7c, 0xbf, 0xb9, 0x09, 0x1a, 0x58,
+    0x5b, 0xdb, 0x8e, 0xa4, 0x75, 0x93, 0x07, 0xc5, 0x6c, 0x1b, 0x3d, 0xaf, 0xc6, 0x69, 0x24, 0x5a,
+    0x6f, 0x65, 0x4b, 0x6f, 0x73, 0x00, 0x52, 0x26, 0x6a, 0x01, 0xad, 0x4f, 0x9c, 0x0b, 0x59, 0xed,
+    0x4e, 0x17, 0x71, 0x2b, 0x3e, 0x72, 0xdf, 0x04, 0x98, 0xaa, 0x8d, 0xe4, 0x88, 0x8f, 0x99, 0x35,
+    0x31, 0xc6, 0x0a, 0xcd, 0xed, 0x1d, 0x4b, 0x66, 0xe8, 0x9d, 0xe0, 0xb6, 0x48, 0x2c, 0xcc, 0xd4,
+    0xa7, 0x12, 0xf5, 0xcf, 0x9d, 0x4c, 0xa8, 0x3b, 0xe0, 0xf9, 0x22, 0xde, 0x2c, 0x1d, 0xbb, 0x3a,
+    0x14, 0x07, 0x48, 0x0d, 0xbe, 0x87, 0x95, 0x99, 0x3d, 0x8b, 0xe6, 0x40, 0x98, 0x8a, 0xbf, 0xe7,
+    0xa8, 0xa1, 0xb3, 0x3a, 0x12, 0x13, 0x1c, 0x45, 0x1e, 0x1a, 0xbc, 0x0d, 0x83, 0xfb, 0x85, 0x18,
+    0x62, 0xc6, 0x37, 0xce, 0x72, 0x4d, 0x5f, 0xe9, 0x7a, 0xa9, 0xa8, 0x06, 0xcf, 0x34, 0xba, 0xb5,
+    0x09, 0xf4, 0x55, 0x4b, 0x0c, 0xd1, 0x0a, 0x7d, 0xdf, 0xd5, 0x82, 0x1b, 0x09, 0x1a, 0xd2, 0xc9,
+    0x0c, 0x1a, 0xa1, 0xd8, 0x1e, 0xb3, 0xd7, 0x2d, 0xb4, 0x19, 0x93, 0xb6, 0x48, 0xf4, 0x1e, 0x21,
+    0x38, 0xff, 0x95, 0x31, 0xa3, 0x0f, 0xf7, 0x3b, 0x22, 0x14, 0x0e, 0x4e, 0xbd, 0x7b, 0xaa, 0x33,
+    0x84, 0x8e, 0x51, 0x2d, 0x99, 0x30, 0x0c, 0x5c, 0x13, 0x1c, 0x6e, 0x75, 0xf5, 0x71, 0x4a, 0x5c,
+    0x6d, 0xcb, 0x17, 0x8b, 0x4a, 0x49, 0x78, 0xda, 0xc8, 0x3a, 0xd4, 0x12, 0xfb, 0xd6, 0x92, 0x01,
+    0x92, 0x50, 0xc5, 0x53, 0x04, 0x9a, 0xad, 0x45, 0x79, 0x84, 0xbe, 0xdf, 0xc9, 0x6a, 0xe7, 0x01,
+    0xc6, 0x59, 0xbc, 0x70, 0x07, 0xa9, 0x7d, 0x0a, 0x90, 0x02, 0xb9, 0x45, 0xbd, 0xec, 0x45, 0xa9,
+    0x45, 0xef, 0x62, 0x85, 0xb2, 0xcd, 0x55, 0x3b, 0x4c, 0x09, 0xd9, 0x07, 0xc6, 0x27, 0x86, 0x3f,
+    0x03, 0x99, 0xe8, 0x72, 0x5b, 0x4f, 0xf7, 0xfc, 0x59, 0x79, 0xe3, 0xcf, 0xf2, 0x28, 0x14, 0x50,
+    0x84, 0x48, 0xef, 0x8b, 0x98, 0x31, 0xc2, 0x85, 0x95, 0x93, 0x33, 0x39, 0x6a, 0xa3, 0x62, 0xa5,
+    0x1c, 0xf2, 0x05, 0x09, 0x7a, 0xfa, 0xbe, 0xc1, 0x5e, 0x41, 0xfb, 0x6e, 0x30, 0xb6, 0x22, 0x37,
+    0x4b, 0xf5, 0x8b, 0x37, 0xef, 0x9d, 0x1b, 0x24, 0x1e, 0xad, 0x5a, 0x68, 0x2b, 0x98, 0xb6, 0x57,
+    0x49, 0xa5, 0x75, 0x68, 0xe2, 0x38, 0xd5, 0x0a, 0xfd, 0x41, 0x7e, 0x1e, 0x96, 0x0e, 0x7b, 0x5a,
+    0x06, 0x4f, 0xd9, 0xf6, 0x94, 0xd7, 0x83, 0xa2, 0xcb, 0xcd, 0x58, 0x55, 0x2d, 0xed, 0xbb, 0x9e,
+    0x5e, 0x11, 0x23, 0x67, 0x4e, 0xf7, 0x3a, 0x52, 0x41, 0x96, 0xcf, 0x05, 0xd3, 0xe5, 0x24, 0x66,
+    0x05, 0x49, 0xff, 0xe7, 0xbd, 0x65, 0x68, 0x05, 0x71, 0x35, 0xff, 0xd5, 0xaf, 0xd9, 0x43, 0xf6,
+    0xda, 0x11, 0xcb, 0xb5, 0x97, 0xe8, 0xcc, 0xec, 0xd7, 0x7e, 0xcb, 0xe9, 0x09, 0xde, 0x06, 0x31,
+    0xbf, 0xa2, 0x9c, 0xd3, 0xe3, 0xd5, 0x54, 0x46, 0x71, 0xba, 0x80, 0x25, 0x61, 0x53, 0xd6, 0xe9,
+    0x99, 0x0b, 0x88, 0xad, 0x8e, 0x0c, 0xf4, 0x98, 0x9b, 0xef, 0x4b, 0xe4, 0x57, 0xf9, 0xc7, 0xb0,
+    0xf1, 0xaa, 0xcd, 0x6e, 0x0e, 0xf3, 0x20, 0x60, 0x5c, 0x29, 0xed, 0x0c, 0xd2, 0xeb, 0x6c, 0xfc,
+    0xe2, 0x16, 0xc5, 0x2a, 0x31, 0x75, 0x80, 0x20, 0x1c, 0xad, 0x7a, 0x09, 0x43, 0xd2, 0x4b, 0x7b,
+    0x06, 0xd5, 0xbf, 0x75, 0x87, 0x61, 0xdd, 0x96, 0xe1, 0x19, 0x70, 0xb5, 0xde, 0xd6, 0x97, 0x22,
+    0x2b, 0x2c, 0x77, 0xe7, 0xf2, 0x56, 0xa6, 0x05, 0xac, 0x75, 0x55, 0x49, 0xc1, 0x65, 0x1f, 0x25,
+    0xad, 0xfc, 0x9d, 0x53, 0xd9, 0x11, 0x7e, 0x3a, 0x0b, 0xb4, 0x09, 0xee, 0xe4, 0xa6, 0x00, 0x12,
+    0x04, 0x72, 0x94, 0x9c, 0x7d, 0xda, 0x1c, 0x2e, 0xdb, 0x3c, 0x33, 0x0c, 0x7f, 0x96, 0x17, 0x99,
+    0x82, 0x91, 0x64, 0x57, 0xd3, 0x31, 0xe9, 0x63, 0x09, 0xdd, 0x24, 0xdf, 0x74, 0xee, 0xdd, 0x00,
+    0xe7, 0xdb, 0x49, 0x7e, 0xe1, 0x30, 0xf7, 0x7d, 0xe6, 0x66, 0xeb, 0x55, 0x7f, 0xb3, 0x16, 0xe8,
+    0x7a, 0xda, 0xf1, 0x81, 0x3c, 0xe4, 0x26, 0xa4, 0x58, 0xa6, 0xee, 0xe3, 0xa8, 0x5b, 0x2a, 0xb8,
+    0x8f, 0x65, 0x53, 0xaa, 0xda, 0xe8, 0xde, 0x65, 0x2e, 0x21, 0x1a, 0x1d, 0x9f, 0x33, 0x4d, 0x59,
+    0x6b, 0x5e, 0xb6, 0x17, 0x34, 0x07, 0xef, 0xcc, 0x2e, 0x81, 0x54, 0xbb, 0x9c, 0xa1, 0x21, 0x2a,
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