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@roman-khimov roman-khimov released this 28 May 16:01
· 5835 commits to master since this release
v0.75.0
0f6d01f

A long-awaited Neo 2.0 update for neo-go that fixes a lot of subtle little
differences in VM and syscalls behavior compared to C# node that resulted in
storage state mismatches between two nodes. This release makes neo-go fully
compatible with public testnet and mainnet chains, for every transaction in
every block you get the same result.

But it's not just about bugs, as it's been quite a long development cycle,
we've also included some interesting new features like notification subsystem,
neo-debugger compatibility and BadgerDB support. Smart contract compiler and
interop packages were also updated making neo-go even better for developing
real-world complex smart contracts.

New features:

  • support for for loops with no condition was added to the compiler (#799)
  • compiler can now emit debug information compatible with neo-debugger (#804,
    #829)
  • experimental BadgerDB support was added (#839)
  • support for abi.json files generation was added for contract deployment
    with NEO-Express (#916)
  • RPC over websocket connections is now supported both by the server (with
    ws://$SERVER:$PORT/ws URL) and client (WSClient structure, #921)
  • notification subsystem was added for RPC server and client (using websocket
    connections, #895)
  • interop package now has a complete set of syscalls available (#795, #956)
  • push command was added to VM CLI (#967)
  • diff dumps are now supported in db restore CLI command (#991)

Behavior changes:

  • due to DB format changes you'll need to resynchronize your node from
    scratch (and it'll also update its state to a more proper one)
  • runtime.Notify interop now accepts varargs (#825)
  • compiler's --debug parameter is now used for debug information generation,
    use --verbose to get more internal compiler's messages (#829)
  • compiler now outputs hex-encoded contract's bytecode only with --verbose
    option (#829, previously it was always printed)
  • RPC client's representation of GetBlock results changed significantly (#951)
  • some interop functions changed their in/out types to a more proper ones
    (#956, though previous ones didn't really work, so no current code should
    notice that)
  • skip parameter to db restore CLI command was replaced by start
    (#991), when using full (non-diff) NGD dumps with short (-s) form they're
    compatible, but start (as a block index) makes more sense for diff dumps

Improvements:

  • (*Stack).PushVal in vm now supports all types of integers (#776)
  • state.AppExecResult now stores stack in binary representation (#782)
  • vm.NewBigIntegerItem now accepts int64 parameter (#788)
  • RPC client tests were added (#716)
  • buffer reuse added for persisting temporary changes which improved block
    handling speed (#772)
  • significant RPC server package refactoring was done (#753)
  • BoltDB was updated to v1.3.4 (#793)
  • Go 1.14 is now supported (#775)
  • serialization/deserialization tests were unified (#802)
  • emit package now has Array and AppCallWithOperationAndArgs methods for
    easier script creation (#803)
  • persisting from MemCachedStore to MemCachedStore was optimized which
    allowed to gain 10% improvement in block import time for 1.5M mainnet
    blocks (#807)
  • storage.Find usage example was added (#795)
  • VM stack item tests were improved (#812)
  • config directory now only contains configuration files, no Go code (#423,
    #816)
  • local variables are counted more accurately now in the compiler leading to
    less waste in script runtime (#815)
  • NEP5 example was extended with minting function making it a bit more usable
    (#823)
  • DAO was refactored away into its own package from core (#832)
  • additional tests were added for bitwise and numeric VM operations (#833)
  • tests for VM CALL* instructions were added (#833)
  • consensus message parsing was split into two parts so that ordinary nodes
    won't touch CN's data (#862)
  • contract's metadata was moved into smartcontract package from rpc (#916)
  • interop packages documentation was extended (#956)
  • Docker build was fixed to use Makefile (#981)

Bugs fixed:

  • integer stack values were not following C# node format when being converted
    to JSON (#770)
  • vm now uses truncated division to match C# node behavior for negative
    integers (#773)
  • getapplicationlog and other RPC calls now convert Uint160 to JSON the same
    way C# node does (#769)
  • asset state JSON representation now follows the same format as C# node uses
    (with proper field names for 'id' and 'type' and without 'fee' add
    'address' fields, #785, #819)
  • nextconsensus field in getblockheader RPC call answer was using hex
    representation instead of address (#763)
  • getcontractstate RPC call implementation was using wrong format for
    script field in answer (#763)
  • getnep5balances RPC call implementation was using wrong name for
    balance field in answer (#763)
  • getvalidators RPC call was using non-compliant validators keys format in
    its answer (#763)
  • potential problems with GAS parameter handling in CLI (#790)
  • contract init CLI command was not working correctly (#792)
  • RPC calls now accept integer parameters in JSON strings which fix some
    incompatibilities (#794)
  • CALLI VM instruction was using wrong offset (#791, #798)
  • vm Map stack item for using different serialization format from C# node
    (#806, #808)
  • invoke* RPC calls were returning stack in Stack element rather than more
    compliant stack (#805)
  • slices of compound types were treated wrong by the compiler (#800)
  • wrong code was generated for struct variables declarations by the compiler
    (#800)
  • RPC client was incorrectly processing GetRawTransactionVerbose,
    GetBlockVerbose, GetBlockHeader, GetTxOut and ValidateAddress call results
    (#789)
  • type-specific transaction data was completely missing in getrawtransaction
    RPC call verbose output (#585)
  • documentation for wallet CLI commands was fixed to follow renames made by
    previous version (#814)
  • panic in map-containing notifications processing (#809)
  • VM Map implementation now has deterministic iteration order (#818)
  • MOD instruction behavior was fixed to follow neo-vm (#826)
  • negative arguments are now accepted for SHL/SHR VM instructions (#827)
  • improper in-block cache propagation leading to storage state differences
    with C# node (#821, #817)
  • CLI didn't check for mandatory method parameter presence for
    invokefunction command (#828)
  • wrong code generated by the compiler for return statements with no
    parameters (#929)
  • wrong code generated by the compiler for multiple function arguments with
    one type specification (#935)
  • NEP5 example contained wrong address check (#945)
  • improper code generated by the compiler for op= assignments to struct
    fields and slice elements (#954)
  • Storage.Find elements order was adjusted to match C# node implementation
    and eliminate state differences resulting from that (#822, #977, #988,
    #994)
  • step command wasn't really working in VM CLI (#967)
  • PICKITEM instruction implementation was fixed to reject improper input
    argument types (#965, #967)
  • Runtime.CheckWitness was fixed to only accept compressed keys (#968, #971)
  • input data length check was added to (*PublicKey).DecodeBytes (#971)
  • VM reference counting for SETITEM instruction was fixed (#973)
  • Map VM stack item can now be converted to Boolean (#974)
  • Structs were not cloned by SETITEM instruction implementation (#972, #975)
  • GetUnspentCoins syscall implementation was fixed to return array (#978,
    #979, #984)
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