Gus: The small web toolkit for Go

Gus is the toolkit for working with the small web in Go.

Think of it as a net/http for small web protocols. You still have to write your server, but you can focus on the logic you want to implement knowing the protocol is already dealt with. It's been said of gemini that you can write your server in a day. Now you can write it in well under an hour.

The "gus" package

Gus is carefully structured as composable building blocks. The top-level package defines the framework in which servers and clients can be built.

• a request type
• a response type
• a "Server" interface type
• a "Handler" abstraction
• a "Middleware" abstraction
• some useful Handler wrappers: filtering, falling through a list of handlers

Protocols

The packages gus/gemini and gus/gopher provide concrete implementations of gus abstractions specific to those protocols.

• I/O (parsing, formatting) request and responses
• constructors for the various kinds of protocol responses
• helpers for building a protocol-suitable TLS config
• Client implementations
• Servers which can run your Handlers.

The primary text formats for those protocols have higher-level support provided in sub-packages:

• gus/gemini/gemtext supports parsing gemtext and getting direct programmatic access to its AST. Deeper sub-packages provide converters to other formats (markdown and HTML) with overridable templates.
• gus/gopher/gophermap similarly parses the gophermap format and provides access to its AST.

Logging

Gus borrows the logging interface from go-kit.

The logger interface from go-kit/log.

The gus/logging package provides everything you need to get a good basic start to producing helpful logs.

• A request-logging middleware with common diagnostics (time, duration, url, status codes, response body lengths)
• A simple constructor of useful default loggers at various levels. They output colorful logfmt lines to stdout.

gus/contrib/*

This is where useful building blocks themselves start to come in. Sub-packages of contrib include Handler and Middleware implementations which accomplish the things your servers actually need to do.

The sub-packages include:

• fs has handlers that make file servers possible: serve files, build directory listings, etc
• cgi includes handlers which can execute CGI programs
• sharedhost which provides means of handling /~username URLs
• tlsauth contains middlewares and bool functions for authenticating against TLS client certificates
• ...with more to come

Get it

Using gus in your project

To add it to your own go project:

$ go get tildegit.org/tjp/gus

Straight to the code please

The code is hosted here on tildegit.

The generated documentation is on the go package index.

Contribute

There's lots still to do, and contributions are very welcome!

submit an issue or pull request on the tildegit repository,

send me an email directly,

or poke me on IRC: I'm @tjp on irc.tilde.chat where you'll find me in #gemini

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