forked from lda/telodendria
87 lines
2.8 KiB
Groff
87 lines
2.8 KiB
Groff
.Dd $Mdocdate: December 12 2022 $
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.Dt ROUTES 3
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.Os Telodendria Project
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.Sh NAME
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.Nm Routes
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.Nd Matrix API endpoint abstractions.
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.Sh SYNOPSIS
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.In Routes.h
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.Ft char *
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.Fn MATRIX_PATH_POP "MATRIX_PATH"
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.Ft size_t
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.Fn MATRIX_PATH_PARTS "MATRIX_PATH"
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.Ft int
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.Fn MATRIX_PATH_EQUALS "char *" "char *"
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.Sh DESCRIPTION
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.Pp
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.Nm
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provides all of the Matrix API route functions, as well as a few
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helpful macros to be used to declare those route functions, and some
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macros that are intended to be used inside them.
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.Pp
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The route macros are intended to increase the readability of the header,
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so the individual routes are not documented here; only the helper
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macros and structures are documented here. Consult the
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.Pa Routes.h
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file for a list of the registered route functions.
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.Pp
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.Fn MATRIX_PATH_POP
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and
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.Fn MATRIX_PATH_PARTS
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are macros that abstract away the underlying data structure of the
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path so that that routes don't have to care what it is. The reason
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this design choice was made was so that the data structure can be
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switched out without breaking all the routes. These macros should
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be preferred to the actual underlying data structure functions,
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because the data structure may change in the future.
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.Pp
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At the moment, the path data structure is just an array, but it would
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be much more efficient to switch to a queue (which can be easily done
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with the current Queue implementation if we just add a function that
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computes how many elements are in the queue.)
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.Pp
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.Fn MATRIX_PATH_POP
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returns the next available part of the path, and removes it from
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the path such that the next call to
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.Fn MATRIX_PATH_POP
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returns the part after.
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.Fn MATRIX_PATH_PARTS
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returns the number of path parts remaining.
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.Pp
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.Fn MATRIX_PATH_EQUALS
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is just a simple string comparison macro. It takes two strings and
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returns a boolean value indicating whether or not they're equal.
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.Pp
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.Nm
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also defines
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.Fn ROUTE
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and
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.Fn ROUTE_IMPL .
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.Fn ROUTE
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is intended to be used only inside the route header, and should be
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invoked to declare a new route function prototype. It takes the
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route function name, which by convention starts with "Route".
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.Fn ROUTE_IMPL
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may be used to actually implement a route function. It takes the
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route function name, and the name of the variable to put the
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RouteArgs in.
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.Pp
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Every route function takes a RouteArgs structure, which is defined
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as follows:
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.Bd -literal -offset indent
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typedef struct RouteArgs
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{
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MatrixHttpHandlerArgs *matrixArgs;
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HttpServerContext *context;
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MATRIX_PATH *path;
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} RouteArgs;
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.Ed
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.Sh RETURN VALUES
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.Pp
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Each route returns a JSON hash map that contains the response it
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intends to return to the client making the request. Routes
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should NOT return NULL, because then no body will be returned to
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the client, and that is almost always a bug. The Matrix specification
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usually mandates that at least an empty JSON object is returned.
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.Sh SEE ALSO
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.Xr Matrix 3
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