feat: add versioned and backwards-compatible server version to block proposal

Author: hstove

libsigner/src/events.rs

@@ -31,6 +31,7 @@ use blockstack_lib::net::api::postblock_proposal::{
 };
 use blockstack_lib::net::stackerdb::MINER_SLOT_COUNT;
 use blockstack_lib::util_lib::boot::boot_code_id;
+use blockstack_lib::version_string;
 use clarity::vm::types::serialization::SerializationError;
 use clarity::vm::types::QualifiedContractIdentifier;
 use serde::{Deserialize, Serialize};
@@ -45,11 +46,13 @@ use stacks_common::types::chainstate::{
 };
 use stacks_common::util::hash::{Hash160, Sha512Trunc256Sum};
 use stacks_common::util::HexError;
+use stacks_common::versions::STACKS_NODE_VERSION;
 use tiny_http::{
     Method as HttpMethod, Request as HttpRequest, Response as HttpResponse, Server as HttpServer,
 };
 
 use crate::http::{decode_http_body, decode_http_request};
+use crate::v0::messages::BLOCK_RESPONSE_DATA_MAX_SIZE;
 use crate::EventError;
 
 /// Define the trait for the event processor
@@ -69,24 +72,114 @@ pub struct BlockProposal {
     pub burn_height: u64,
     /// The reward cycle the block is mined during
     pub reward_cycle: u64,
+    /// Versioned and backwards-compatible block proposal data
+    pub block_proposal_data: BlockProposalData,
 }
 
 impl StacksMessageCodec for BlockProposal {
     fn consensus_serialize<W: Write>(&self, fd: &mut W) -> Result<(), CodecError> {
         self.block.consensus_serialize(fd)?;
         self.burn_height.consensus_serialize(fd)?;
         self.reward_cycle.consensus_serialize(fd)?;
+        self.block_proposal_data.consensus_serialize(fd)?;
         Ok(())
     }
 
     fn consensus_deserialize<R: Read>(fd: &mut R) -> Result<Self, CodecError> {
         let block = NakamotoBlock::consensus_deserialize(fd)?;
         let burn_height = u64::consensus_deserialize(fd)?;
         let reward_cycle = u64::consensus_deserialize(fd)?;
+        let block_proposal_data = BlockProposalData::consensus_deserialize(fd)?;
         Ok(BlockProposal {
             block,
             burn_height,
             reward_cycle,
+            block_proposal_data,
+        })
+    }
+}
+
+/// The latest version of the block response data
+pub const BLOCK_PROPOSAL_DATA_VERSION: u8 = 2;
+
+/// Versioned, backwards-compatible struct for block response data
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct BlockProposalData {
+    /// The version of the block proposal data
+    pub version: u8,
+    /// The miner's server version
+    pub server_version: String,
+    /// When deserializing future versions,
+    /// there may be extra bytes that we don't know about
+    pub unknown_bytes: Vec<u8>,
+}
+
+impl BlockProposalData {
+    /// Create a new BlockProposalData for the provided server version and unknown bytes
+    pub fn new(server_version: String) -> Self {
+        Self {
+            version: BLOCK_PROPOSAL_DATA_VERSION,
+            server_version,
+            unknown_bytes: vec![],
+        }
+    }
+
+    /// Create a new BlockProposalData with the current build's version
+    pub fn from_current_version() -> Self {
+        let server_version = version_string(
+            "stacks-node",
+            option_env!("STACKS_NODE_VERSION").or(Some(STACKS_NODE_VERSION)),
+        );
+        Self::new(server_version)
+    }
+
+    /// Create an empty BlockProposalData
+    pub fn empty() -> Self {
+        Self::new(String::new())
+    }
+
+    /// Serialize the "inner" block response data. Used to determine the bytes length of the serialized block response data
+    fn inner_consensus_serialize<W: Write>(&self, fd: &mut W) -> Result<(), CodecError> {
+        write_next(fd, &self.server_version.as_bytes().to_vec())?;
+        // write_next(fd, &self.unknown_bytes)?;
+        fd.write_all(&self.unknown_bytes)
+            .map_err(CodecError::WriteError)?;
+        Ok(())
+    }
+}
+
+impl StacksMessageCodec for BlockProposalData {
+    /// Serialize the block response data.
+    /// When creating a new version of the block response data, we are only ever
+    /// appending new bytes to the end of the struct. When serializing, we use
+    /// `bytes_len` to ensure that older versions of the code can read through the
+    /// end of the serialized bytes.
+    fn consensus_serialize<W: Write>(&self, fd: &mut W) -> Result<(), CodecError> {
+        write_next(fd, &self.version)?;
+        let mut inner_bytes = vec![];
+        self.inner_consensus_serialize(&mut inner_bytes)?;
+        write_next(fd, &inner_bytes)?;
+        Ok(())
+    }
+
+    /// Deserialize the block response data in a backwards-compatible manner.
+    /// When creating a new version of the block response data, we are only ever
+    /// appending new bytes to the end of the struct. When deserializing, we use
+    /// `bytes_len` to ensure that we read through the end of the serialized bytes.
+    fn consensus_deserialize<R: Read>(fd: &mut R) -> Result<Self, CodecError> {
+        let Ok(version) = read_next(fd) else {
+            return Ok(Self::empty());
+        };
+        let inner_bytes: Vec<u8> = read_next_at_most(fd, BLOCK_RESPONSE_DATA_MAX_SIZE)?;
+        let mut inner_reader = inner_bytes.as_slice();
+        let server_version: Vec<u8> = read_next(&mut inner_reader)?;
+        let server_version = String::from_utf8(server_version).map_err(|e| {
+            CodecError::DeserializeError(format!("Failed to decode server version: {:?}", &e))
+        })?;
+        Ok(Self {
+            version,
+            server_version,
+            unknown_bytes: inner_reader.to_vec(),
         })
     }
 }

libsigner/src/libsigner.rs

@@ -57,8 +57,8 @@ use stacks_common::versions::STACKS_SIGNER_VERSION;
 
 pub use crate::error::{EventError, RPCError};
 pub use crate::events::{
-    BlockProposal, EventReceiver, EventStopSignaler, SignerEvent, SignerEventReceiver,
-    SignerEventTrait, SignerStopSignaler,
+    BlockProposal, BlockProposalData, EventReceiver, EventStopSignaler, SignerEvent,
+    SignerEventReceiver, SignerEventTrait, SignerStopSignaler,
 };
 pub use crate::runloop::{RunningSigner, Signer, SignerRunLoop};
 pub use crate::session::{SignerSession, StackerDBSession};

libsigner/src/tests/mod.rs

@@ -41,7 +41,7 @@ use stacks_common::codec::{
 use stacks_common::util::secp256k1::Secp256k1PrivateKey;
 use stacks_common::util::sleep_ms;
 
-use crate::events::{SignerEvent, SignerEventTrait};
+use crate::events::{BlockProposalData, SignerEvent, SignerEventTrait};
 use crate::v0::messages::{BlockRejection, SignerMessage};
 use crate::{BlockProposal, Signer, SignerEventReceiver, SignerRunLoop};
 
@@ -126,6 +126,7 @@ fn test_simple_signer() {
         },
         burn_height: 2,
         reward_cycle: 1,
+        block_proposal_data: BlockProposalData::empty(),
     };
     for i in 0..max_events {
         let privk = Secp256k1PrivateKey::random();

libsigner/src/v0/messages.rs

@@ -1160,6 +1160,7 @@ mod test {
     use stacks_common::types::chainstate::StacksPrivateKey;
 
     use super::{StacksMessageCodecExtensions, *};
+    use crate::events::BlockProposalData;
 
     #[test]
     fn signer_slots_count_is_sane() {
@@ -1276,6 +1277,7 @@ mod test {
             block,
             burn_height: thread_rng().next_u64(),
             reward_cycle: thread_rng().next_u64(),
+            block_proposal_data: BlockProposalData::empty(),
         };
         let signer_message = SignerMessage::BlockProposal(block_proposal);
         let serialized_signer_message = signer_message.serialize_to_vec();

stacks-signer/src/signerdb.rs

@@ -1181,7 +1181,7 @@ mod tests {
     use clarity::types::chainstate::{StacksBlockId, StacksPrivateKey, StacksPublicKey};
     use clarity::util::hash::Hash160;
     use clarity::util::secp256k1::MessageSignature;
-    use libsigner::BlockProposal;
+    use libsigner::{BlockProposal, BlockProposalData};
 
     use super::*;
     use crate::signerdb::NakamotoBlockVote;
@@ -1204,6 +1204,7 @@ mod tests {
             block,
             burn_height: 7,
             reward_cycle: 42,
+            block_proposal_data: BlockProposalData::empty(),
         };
         overrides(&mut block_proposal);
         (BlockInfo::from(block_proposal.clone()), block_proposal)

stacks-signer/src/tests/chainstate.rs

@@ -29,7 +29,7 @@ use blockstack_lib::net::api::get_tenures_fork_info::TenureForkingInfo;
 use blockstack_lib::net::api::getsortition::SortitionInfo;
 use clarity::types::chainstate::{BurnchainHeaderHash, SortitionId};
 use clarity::util::vrf::VRFProof;
-use libsigner::BlockProposal;
+use libsigner::{BlockProposal, BlockProposalData};
 use slog::slog_info;
 use stacks_common::bitvec::BitVec;
 use stacks_common::consts::CHAIN_ID_TESTNET;
@@ -244,6 +244,7 @@ fn reorg_timing_testing(
         },
         burn_height: 2,
         reward_cycle: 1,
+        block_proposal_data: BlockProposalData::empty(),
     };
     let mut header_clone = block_proposal_1.block.header.clone();
     let mut block_info_1 = BlockInfo::from(block_proposal_1);
@@ -511,6 +512,7 @@ fn check_sortition_timeout() {
         },
         burn_height: 2,
         reward_cycle: 1,
+        block_proposal_data: BlockProposalData::empty(),
     };
 
     let mut block_info = BlockInfo::from(block_proposal);

testnet/stacks-node/src/nakamoto_node/signer_coordinator.rs

@@ -21,7 +21,7 @@ use std::thread::JoinHandle;
 use std::time::{Duration, Instant};
 
 use libsigner::v0::messages::{MinerSlotID, SignerMessage as SignerMessageV0};
-use libsigner::{BlockProposal, SignerSession, StackerDBSession};
+use libsigner::{BlockProposal, BlockProposalData, SignerSession, StackerDBSession};
 use stacks::burnchains::Burnchain;
 use stacks::chainstate::burn::db::sortdb::SortitionDB;
 use stacks::chainstate::burn::{BlockSnapshot, ConsensusHash};
@@ -250,6 +250,7 @@ impl SignerCoordinator {
             block: block.clone(),
             burn_height: election_sortition.block_height,
             reward_cycle: reward_cycle_id,
+            block_proposal_data: BlockProposalData::from_current_version(),
         };
 
         let block_proposal_message = SignerMessageV0::BlockProposal(block_proposal);

testnet/stacks-node/src/tests/signer/v0.rs

@@ -26,7 +26,9 @@ use libsigner::v0::messages::{
     BlockAccepted, BlockRejection, BlockResponse, MessageSlotID, MinerSlotID, RejectCode,
     SignerMessage,
 };
-use libsigner::{BlockProposal, SignerSession, StackerDBSession, VERSION_STRING};
+use libsigner::{
+    BlockProposal, BlockProposalData, SignerSession, StackerDBSession, VERSION_STRING,
+};
 use serde::Deserialize;
 use stacks::address::AddressHashMode;
 use stacks::burnchains::Txid;
@@ -405,6 +407,7 @@ impl SignerTest<SpawnedSigner> {
             block,
             burn_height,
             reward_cycle,
+            block_proposal_data: BlockProposalData::empty(),
         });
         let miner_sk = self
             .running_nodes