Implement asynchronous callbacks for curl. More...

#include <freeradius-devel/curl/base.h>
#include <freeradius-devel/server/module.h>
#include <freeradius-devel/unlang/interpret.h>
#include <freeradius-devel/util/debug.h>
#include <freeradius-devel/util/syserror.h>

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Macros
#define	SET_MOPTION(_mandle, _opt, _val)

Functions
static void	_fr_curl_io_demux (fr_curl_handle_t mhandle, CURLM mandle)
	De-queue curl requests and wake up the requests that initiated them. More...

static int	_fr_curl_io_event_modify (UNUSED CURL easy, curl_socket_t fd, int what, void ctx, UNUSED void *fd_ctx)
	Called by libcurl to register a socket that it's intefr_curled in receiving IO events for. More...

static int	_fr_curl_io_request_free (fr_curl_io_request_t *randle)

static void	_fr_curl_io_service (fr_curl_handle_t *mhandle, int fd, int event)
	Service an IO event on a file descriptor. More...

static void	_fr_curl_io_service_errored (UNUSED fr_event_list_t el, int fd, int flags, int fd_errno, void uctx)
	File descriptor experienced an error. More...

static void	_fr_curl_io_service_readable (UNUSED fr_event_list_t el, int fd, UNUSED int flags, void uctx)
	File descriptor became readable. More...

static void	_fr_curl_io_service_writable (UNUSED fr_event_list_t el, int fd, UNUSED int flags, void uctx)
	File descriptor became writable. More...

static void	_fr_curl_io_timer_expired (UNUSED fr_event_list_t el, UNUSED fr_time_t now, void uctx)
	libcurl's timer expired More...

static int	_fr_curl_io_timer_modify (CURLM mandle, long timeout_ms, void ctx)
	Callback called by libcurl to set/unset timers. More...

static int	_mhandle_free (fr_curl_handle_t *mhandle)
	Free the multi-handle. More...

static int	curl_debug_log (UNUSED CURL candle, curl_infotype type, char data, size_t len, void *uctx)
	Callback to receive debugging data from libcurl. More...

fr_curl_handle_t *	fr_curl_io_init (TALLOC_CTX ctx, fr_event_list_t el, UNUSED bool multiplex)
	Performs the libcurl initialisation of the thread. More...

fr_curl_io_request_t *	fr_curl_io_request_alloc (TALLOC_CTX *ctx)
	Allocate a new curl easy request and wrapper struct. More...

int	fr_curl_io_request_enqueue (fr_curl_handle_t mhandle, request_t request, fr_curl_io_request_t *randle)
	Sends a request using libcurl. More...

Detailed Description

Implement asynchronous callbacks for curl.

Id: b72064bb98a3e1e49d61f15f5941c5cb9465dbc7

Copyright: 2020 Arran Cudbard-Bell (a.cud.nosp@m.bard.nosp@m.b@fre.nosp@m.erad.nosp@m.ius.o.nosp@m.rg)

Definition in file io.c.

Macro Definition Documentation

◆ SET_MOPTION

#define SET_MOPTION	(	_mandle,
		_opt,
		_val
	)

Value:

do {\
        if ((ret = curl_multi_setopt(mandle, _opt, _val)) != CURLM_OK) {\
                option = STRINGIFY(_opt);\
                goto error;\
        }\
} while (0)

Definition at line 38 of file io.c.

Function Documentation

◆ _fr_curl_io_demux()

static void _fr_curl_io_demux	(	fr_curl_handle_t *	mhandle,
		CURLM *	mandle
	)

inlinestatic

De-queue curl requests and wake up the requests that initiated them.

Parameters

[in]	mhandle	containing the event loop and request counter.
[in]	mandle	to dequeue curl easy handles/responses from.

Definition at line 51 of file io.c.

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◆ _fr_curl_io_event_modify()

static int _fr_curl_io_event_modify	(	UNUSED CURL *	easy,
		curl_socket_t	fd,
		int	what,
		void *	ctx,
		UNUSED void *	fd_ctx
	)

static

Called by libcurl to register a socket that it's intefr_curled in receiving IO events for.

Parameters

[in]	easy	handle this fd relates to.
[in]	fd	File descriptor curl wants to be notified about.
[in]	what	Which events libcurl wants to be notified of, may be one of: CURL_POLL_IN Wait for incoming data. For the socket to become readable. CURL_POLL_OUT Wait for outgoing data. For the socket to become writable. CURL_POLL_INOUT Wait for incoming and outgoing data. For the socket to become readable or writable. CURL_POLL_REMOVE The specified socket/file descriptor is no longer used by libcurl.
[in]	ctx	The fr_curl_handle_t specific to this thread.
[in]	fd_ctx	Private data associated with the socket.

Definition at line 327 of file io.c.

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◆ _fr_curl_io_request_free()

static int _fr_curl_io_request_free ( fr_curl_io_request_t * randle )

static

Definition at line 536 of file io.c.

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◆ _fr_curl_io_service()

static void _fr_curl_io_service	(	fr_curl_handle_t *	mhandle,
		int	fd,
		int	event
	)

inlinestatic

Service an IO event on a file descriptor.

Parameters

[in]	mhandle	containing the event loop and request counter.
[in]	fd	the IO event occurred for.
[in]	event	type.

Definition at line 151 of file io.c.

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◆ _fr_curl_io_service_errored()

static void _fr_curl_io_service_errored	(	UNUSED fr_event_list_t *	el,
		int	fd,
		int	flags,
		int	fd_errno,
		void *	uctx
	)

static

File descriptor experienced an error.

Parameters

[in]	el	fd was registered with.
[in]	fd	that errored.
[in]	flags	from kevent.
[in]	fd_errno	from kevent.
[in]	uctx	The rlm_fr_curl_thread_t specific to this thread.

Definition at line 205 of file io.c.

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◆ _fr_curl_io_service_readable()

static void _fr_curl_io_service_readable	(	UNUSED fr_event_list_t *	el,
		int	fd,
		UNUSED int	flags,
		void *	uctx
	)

static

File descriptor became readable.

Parameters

[in]	el	fd was registered with.
[in]	fd	that became readable.
[in]	flags	from kevent.
[in]	uctx	The rlm_fr_curl_thread_t specific to this thread.

Definition at line 251 of file io.c.

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◆ _fr_curl_io_service_writable()

static void _fr_curl_io_service_writable	(	UNUSED fr_event_list_t *	el,
		int	fd,
		UNUSED int	flags,
		void *	uctx
	)

static

File descriptor became writable.

Parameters

[in]	el	fd was registered with.
[in]	fd	that became writable.
[in]	flags	from kevent.
[in]	uctx	The rlm_fr_curl_thread_t specific to this thread.

Definition at line 235 of file io.c.

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◆ _fr_curl_io_timer_expired()

static void _fr_curl_io_timer_expired	(	UNUSED fr_event_list_t *	el,
		UNUSED fr_time_t	now,
		void *	uctx
	)

static

libcurl's timer expired

Parameters

[in]	el	the timer was inserted into.
[in]	now	The current time according to the event loop.
[in]	uctx	The rlm_fr_curl_thread_t specific to this thread.

Definition at line 124 of file io.c.

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◆ _fr_curl_io_timer_modify()

static int _fr_curl_io_timer_modify	(	CURLM *	mandle,
		long	timeout_ms,
		void *	ctx
	)

static

Callback called by libcurl to set/unset timers.

Each rlm_fr_curl_thread_t has a timer event which is controller by libcurl. This allows libcurl to honour timeouts set on requests to remote hosts, and means we don't need to set timeouts for individual I/O events.

Parameters

[in]	mandle	handle requesting the timer be set/unset.
[in]	timeout_ms	If > 0, how long to wait before calling curl_multi_socket_action. If == 0, we call curl_multi_socket_action as soon as possible. If < 0, we delete the timer.
[in]	ctx	The rlm_fr_curl_thread_t specific to this thread.

Returns

0 on success.
-1 on error.

Definition at line 275 of file io.c.

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◆ _mhandle_free()

static int _mhandle_free ( fr_curl_handle_t * mhandle )

static

Free the multi-handle.

Definition at line 567 of file io.c.

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◆ curl_debug_log()

static int curl_debug_log	(	UNUSED CURL *	candle,
		curl_infotype	type,
		char *	data,
		size_t	len,
		void *	uctx
	)

static

Callback to receive debugging data from libcurl.

Note: Should only be set on a handle if RDEBUG_ENABLED3 is true.

Parameters

[in]	candle	Curl handle the debugging data pertains to.
[in]	type	The type of debugging data we received.
[in]	data	Buffer containing debug data (not \0 terminated). Despite the type being char *, this can be binary data depending on the curl_infotype.
[in]	len	The length of the data in the buffer.
[in]	uctx	The current request.

Returns

0 (we always indicate success)

Definition at line 401 of file io.c.

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◆ fr_curl_io_init()

fr_curl_handle_t* fr_curl_io_init	(	TALLOC_CTX *	ctx,
		fr_event_list_t *	el,
		UNUSED bool	multiplex
	)

Performs the libcurl initialisation of the thread.

Parameters

[in]	ctx	to alloc handle in.
[in]	el	to initial.
[in]	multiplex	Run multiple requests over the same connection simultaneously. HTTP/2 only.

Returns

0 on success.
-1 on error.

Definition at line 584 of file io.c.

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◆ fr_curl_io_request_alloc()

fr_curl_io_request_t* fr_curl_io_request_alloc ( TALLOC_CTX * ctx )

Allocate a new curl easy request and wrapper struct.

Definition at line 546 of file io.c.

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◆ fr_curl_io_request_enqueue()

int fr_curl_io_request_enqueue	(	fr_curl_handle_t *	mhandle,
		request_t *	request,
		fr_curl_io_request_t *	randle
	)

Sends a request using libcurl.

Send the actual curl request to the server. The response will be handled by the numerous callbacks configured for the easy handle.

Parameters

[in]	mhandle	Thread-specific mhandle wrapper.
[in]	request	Current request.
[in]	randle	representing the request.

Returns

0 on success.
-1 on failure.

Definition at line 482 of file io.c.

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Macros

Functions

Detailed Description

Macro Definition Documentation

◆ SET_MOPTION

Function Documentation

◆ _fr_curl_io_demux()

◆ _fr_curl_io_event_modify()

◆ _fr_curl_io_request_free()

◆ _fr_curl_io_service()

◆ _fr_curl_io_service_errored()

◆ _fr_curl_io_service_readable()

◆ _fr_curl_io_service_writable()

◆ _fr_curl_io_timer_expired()

◆ _fr_curl_io_timer_modify()

◆ _mhandle_free()

◆ curl_debug_log()

◆ fr_curl_io_init()

◆ fr_curl_io_request_alloc()

◆ fr_curl_io_request_enqueue()