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Project tcp-hash

Hash server:

  • 3 background threads to calculate hashes
  • main thread accepting connections and passing sockets to background threads
  • per socket server uses 2 x 1024 bytes for a buffer

Implemented on top of Boost Asio and xxHash (see Dockerfile):

TODO:

  • very slow Integer to Hex string conversion (std::stream, setfill) - 50% of server time
  • segfaults in xxHash on big input

Building and running

Checkout the code, create Docker container, start Docker service listening TCP port 1234:

    git clone https://github.com/makru86/tcp-hash.git
    cd tcp-hash
    make docker-serve # or make serve

tcp-hash Prototype: shell script with ncat and xxhsum

See tools/tcp_hash_prototype.sh. See tools/client.sh.

netcat example

Keep connection open, exit by Ctrl-C:

    netcat localhost 1234
    Hello, world!
>>> 0x2c6b514f4f9e3e3c
    dd
>>> 0x3fa6d80d3a0da668

Using with netcat-openbsd

netcat-openbsd (nc) example, closing connection after receiving response:

    echo "Hello, world!" | nc -W 1 localhost 1234
>>> 0x2c6b514f4f9e3e3c

nc option -W recvlimit:

Terminate after receiving recvlimit packets from the network.

Development

    make build  # or make docker-build
    make test   # or make docker-test

Formatting code, clang-tidy

    make formatted
    make tidy

Code coverage report

    env CODE_COVERAGE=ON make up
    make coverage-report
>>> Generating coverage report...
>>> lines: 54.9% (79 out of 144)
>>> branches: 36.6% (232 out of 634)
>>> build/coverage.xml