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add Erlang implementation to readme [ci skip] [circleci skip]

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Anton Kaliaev
2017-04-15 11:00:47 +04:00
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[![CircleCI](https://circleci.com/gh/tendermint/abci.svg?style=svg)](https://circleci.com/gh/tendermint/abci) [![CircleCI](https://circleci.com/gh/tendermint/abci.svg?style=svg)](https://circleci.com/gh/tendermint/abci)
Blockchains are a system for multi-master state machine replication. Blockchains are a system for multi-master state machine replication.
**ABCI** is an interface that defines the boundary between the replication engine (the blockchain), **ABCI** is an interface that defines the boundary between the replication engine (the blockchain),
and the state machine (the application). and the state machine (the application).
By using a socket protocol, we enable a consensus engine running in one process By using a socket protocol, we enable a consensus engine running in one process
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Previously, the ABCI was referred to as TMSP. Previously, the ABCI was referred to as TMSP.
Other implementations: Other implementations:
* [cpp-tmsp](https://github.com/mdyring/cpp-tmsp) by Martin Dyring-Andersen * C++ [cpp-tmsp](https://github.com/mdyring/cpp-tmsp) by Martin Dyring-Andersen
* [js-abci](https://github.com/tendermint/js-abci) * JavaScript [js-abci](https://github.com/tendermint/js-abci)
* [jABCI](https://github.com/jTendermint/jabci) for Java * Java [jABCI](https://github.com/jTendermint/jabci)
* Erlang [abci_server](https://github.com/KrzysiekJ/abci_server) by Krzysztof Jurewicz
# Specification # Specification
The [primary specification](https://github.com/tendermint/abci/blob/master/types/types.proto) is made using Protocol Buffers. The [primary specification](https://github.com/tendermint/abci/blob/master/types/types.proto) is made using Protocol Buffers.
To build it, run To build it, run
``` ```
make protoc make protoc
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## Socket ## Socket
ABCI is best implemented as a streaming protocol. ABCI is best implemented as a streaming protocol.
The socket implementation provides for asynchronous, ordered message passing over unix or tcp. The socket implementation provides for asynchronous, ordered message passing over unix or tcp.
Messages are serialized using Protobuf3 and length-prefixed. Messages are serialized using Protobuf3 and length-prefixed.
Protobuf3 doesn't have an official length-prefix standard, so we use our own. The first byte represents the length of the big-endian encoded length. Protobuf3 doesn't have an official length-prefix standard, so we use our own. The first byte represents the length of the big-endian encoded length.
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## GRPC ## GRPC
GRPC is an rpc framework native to Protocol Buffers with support in many languages. GRPC is an rpc framework native to Protocol Buffers with support in many languages.
Implementing the ABCI using GRPC can allow for faster prototyping, but is expected to be much slower than Implementing the ABCI using GRPC can allow for faster prototyping, but is expected to be much slower than
the ordered, asynchronous socket protocol. the ordered, asynchronous socket protocol.
Note the length-prefixing used in the socket implementation does not apply for GRPC. Note the length-prefixing used in the socket implementation does not apply for GRPC.