FEP — Front-End Processor (Mock Card Network Server)

Architecture

VAN / Merchant client
        │  TCP (length-prefixed frames)
        ▼
   TcpServer + EventLoop
   (Linux: epoll ET + O_NONBLOCK / else: select)
        │
        ▼
     FepServer  ──authorize/reverse──►  ICardNetworkAdapter
                                              │
                              ┌───────────────┴───────────────┐
                              ▼                               ▼
                       MockCardAdapter                 RealCardAdapter
                       (로컬 승인 규칙)                 (실연동 스텁)

Build

Windows (MSVC / Visual Studio generator)

cmake -S . -B build
cmake --build build --config Release

실행 파일: build\Release\fep_server.exe, build\Release\fep_client.exe

Linux (epoll 경로)

cmake -S . -B build
cmake --build build -j
./build/fep_server --port 9100 --adapter mock

Run

서버:

.\build\Release\fep_server.exe --port 9100 --adapter mock

Protocol (demo)

[4-byte BE length][ASCII payload]

AUTH_REQ|merchant|terminal|pan|amount|currency|trace
AUTH_RESP|code|auth_code|approval_no|message|trace
REV_REQ|merchant|orig_approval|amount|trace
REV_RESP|code|message|trace
HB|ping / HB_ACK|pong

Layout

include/adapter/   ICardNetworkAdapter, Mock, Real, Factory
include/protocol/  Message, Codec
include/net/       EventLoop, Connection, TcpServer
include/fep/       FepServer
src/…              implementations
src/tools/         fep_client
config/fep.conf    defaults (문서용)