genmarkov

HTTP server connecting to a Markov chain

Build requirements

Unix & Rust nightly are currently requirements to build, for now.

Configuration

When ran with no arguments, markov will attempt to load the config file at markov.toml. If it does not exist, it will use the default configuration. (On debug builds, it will also create the default markov.toml.)

An example default configuration file is provided at ./markov.toml.

When ran with an argument specifying the config file however, it will attempt to load that. If it fails to load the file, the default will be used.

Config file entries

Name	Description	Default	Optional
bindpoint	Address or Unix domain socket for the server to bind to	127.0.0.1:8001	No
file	File to save and load the chain from	chain.dat	No
max_content_length	Max request body length to allow	4194304 (4MB)	No
max_gen_size	Max number of strings for a request to generate at once	256	No
save_interval_secs	Number of seconds to ensure waiting before saving chain	2	Yes
trust_x_forwarded_for	Trust the X-Forwarded-For HTTP header	false	No
filter	Remove characters from incoming and/or outgoing text	None	Yes

AF_UNIX note

When binding to a Unix domain socket, prefix the path with unix:/ (e.g. unix://var/markov.socket) The server will not attempt to remove already existing sockets at the path, so ensure there isn't one before launching.

Logging

Set the RUST_LOG environment variable to one of the following to switch runtime logging levels.

• trace - Most verbose
• debug - Verbose
• info - Show input and output to/from the chain and requests
• warn - Only show warnings (default)
• error - Only show errors

Signals

On Unix systems at runtime, some signals are trapped:

Signal	Description
SIGUSR1	Immediately save the chain
SIGUSR2	Immediately load the chain
SIGQUIT	Ensure the chain is properly saved and then immediately call abort()
SIGINT	Perform a full graceful shutdown

Usage

The server exposes several paths for access of the chain

Feeding

PUT /put

Request body is fed to the chain

NOTE

Strings fed to the chain must be valid UTF-8 and a size below the value specified in the config file.

Generating

GET /get

Generate a string from the chain

GET /get/<number>

Generate <number> strings from the chain

GET /get/sentance

Generate a single sentance from the chain

GET /get/sentance/<number>

Generate <number> sentances from the chain

NOTE

Number of strings/sentances must be lower than the value specified in the config file.

License

GPL'd with <3