# ExFIX
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**Warning:** This library is under active development and the API is subject to change.
Elixir implementation of FIX Session Protocol FIXT.1.1.
Currently only supports FIX session initiator (buy side).
## Installation
Add `ex_fix` to your list of dependencies in `mix.exs`:
```elixir
def deps do
[{:ex_fix, "~> 0.1.3"}]
end
```
## Usage
```elixir
defmodule MyFixApplication do
@behaviour ExFix.FixApplication
require Logger
alias ExFix.Types.Message
alias ExFix.Parser
@msg_new_order_single "D"
def on_logon(fix_session_name, session_pid) do
fields = [] # See examples directory
ExFix.send_message!(session_pid, @msg_new_order_single, fields)
end
def on_message(fix_session_name, msg_type, session_pid, %Message{} = msg) do
Logger.info "Msg received: #{inspect Parser.parse2(msg)}"
end
def on_logout(_fix_session_name), do: :ok
end
ExFix.start_session_initiator("mysession", "SENDER", "TARGET", MyFixApplication,
socket_connect_host: "localhost", socket_connect_port: 9876,
logon_username: "user1", logon_password: "pwd1", transport_mod: :ssl)
```
## Features
- FIXT.1.1 session protocol implementation (session level messages)
- Message validation: sequence number, length, checksum
- Auto reconnection
- SSL compatible
- Session registry
- Two-phase parse of FIX messages
## Two-phase parse
This library allows to parse the FIX message until certain tags are found. At that
point it is possible to send the message to another process (for example, a Book process,
Account process, etc) to complete the parse and execute business logic specifically for
the message's `subject`.
As can be seen in the benchmarks below, the two-phase parse substantially decreases
the time spent in the network client process.
## To Do list
This is a work in progress. Here is a list of some pending tasks, PRs are welcome.
- Application level:
- Dictionary based message parse/validation/serialization
- Automatic generation of parser/validator/serializer from XML dictionary file
- Repeating groups
- FIX session acceptor
- Multiple hosts configuration, for failover
- Session scheduling (integration with 3rd party job management libraries)
- etc.
## Benchmarks
Elixir can't beat the performance of C/C++, but this library lets you avoid
communication time between an external FIX initiator and the Erlang VM.
In addition, there are fewer dependencies and number of possible failure points.
- HW: Laptop Dell Latitude E5570 Intel(R) Core(TM) i7-6600U CPU @ 2.60GHz 16 GB RAM
- Elixir 1.4.5 / Erlang 19.2
- Parser benchmark: Execution Report with 155 bytes.
- Serializer benchmark: New Order Single with 115 bytes.
```
$ mix bench
...
## ExFixBench
benchmark name iterations average time
Parse - Stage 1 (without validation) 500000 6.26 µs/op
Parse - Stage 1 500000 7.64 µs/op
Serialize 100000 11.75 µs/op
Parse - Full Msg (without validation) 100000 14.42 µs/op
Parse - Full Msg 100000 16.23 µs/op
```
## Author
Santiago Fernandez `<santif@gmail.com>`.
## License
Copyright (c) 2017 Matriz S.A. [http://www.matriz.com.ar](http://www.matriz.com.ar)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
