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# simple-tcp-service
## What is this?
This directory contains code that is intended to make it easier to
produce services that expose TCP sockets and use ACL2s.
This directory contains several parts:
- An ASDF system providing a TCP server that allows one to create a
customized "ACL2s service" that exposes some capabilities over a TCP
socket using a custom protocol
- An ASDF system providing a library for encoding and decoding Defdata
values as JSON
- A small Python module for connecting to and interacting with an
ACL2s service
- A simple example ACL2s service
## Prerequisites
To run the examples, Quicklisp should be installed. If not installed
at `~/quicklisp`, the `QUICKLISP_SETUP` environment variable should be
set to the path to the `quicklisp/setup.lisp` file. If your ACL2 image
starts with Quicklisp loaded, this is not required. (you can check
this by exiting into raw lisp and checking whether `*features*`
contains `:QUICKLISP`)
## How do I use this?
To create a service, one needs to create a request handler for
it. This is a function that takes in the body of a message (decoded as
a UTF-8 string) and produces a string (that will be encoded using
UTF-8 and sent back to the requester). In most cases, one can simply
use the rest of the files from the `basic-server` example with the
custom request handler (updating `load`s as appropriate).
The Python module supports both starting up a ACL2s service image in a
subprocess and connecting to an existing service (given its TCP
port). This means that the services can be running on different
computers and interacted with over a network if desired, as long as
the appropriate network configuration is performed to e.g. forward
ports if needed. One could also create several services in
subprocesses to create a worker pool and use something like Flask to
integrate the service with a REST API.
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