Handle pools of connections (threads, sockets, etc.) More...

#include <freeradius-devel/server/base.h>
#include <freeradius-devel/server/modpriv.h>
#include <freeradius-devel/util/debug.h>
#include <freeradius-devel/util/heap.h>
#include <freeradius-devel/util/misc.h>
#include <time.h>

Include dependency graph for pool.c:

Go to the source code of this file.

Data Structures
struct	fr_pool_connection_s
	An individual connection within the connection pool. More...

struct	fr_pool_s
	A connection pool. More...

Macros
#define	LOG_PREFIX pool->log_prefix

Typedefs
typedef struct fr_pool_connection_s	fr_pool_connection_t

Functions
static int	connection_check (fr_pool_t pool, request_t request)
	Check whether any connections need to be removed from the pool. More...

static void	connection_close_internal (fr_pool_t pool, fr_pool_connection_t this)
	Close an existing connection. More...

static fr_pool_connection_t *	connection_find (fr_pool_t pool, void conn)
	Find a connection handle in the connection list. More...

static void *	connection_get_internal (fr_pool_t pool, request_t request, bool spawn)
	Get a connection from the connection pool. More...

static void	connection_link_head (fr_pool_t pool, fr_pool_connection_t this)
	Adds a connection to the head of the connection list. More...

static int	connection_manage (fr_pool_t pool, request_t request, fr_pool_connection_t *this, fr_time_t now)
	Check whether a connection needs to be removed from the pool. More...

static fr_pool_connection_t *	connection_spawn (fr_pool_t pool, request_t request, fr_time_t now, bool in_use, bool unlock)
	Spawns a new connection. More...

static void	connection_unlink (fr_pool_t pool, fr_pool_connection_t this)
	Removes a connection from the connection list. More...

int	fr_pool_connection_close (fr_pool_t pool, request_t request, void *conn)
	Delete a connection from the connection pool. More...

void *	fr_pool_connection_get (fr_pool_t pool, request_t request)
	Reserve a connection in the connection pool. More...

void *	fr_pool_connection_reconnect (fr_pool_t pool, request_t request, void *conn)
	Reconnect a suspected inviable connection. More...

void	fr_pool_connection_release (fr_pool_t pool, request_t request, void *conn)
	Release a connection. More...

fr_pool_t *	fr_pool_copy (TALLOC_CTX ctx, fr_pool_t pool, void *opaque)
	Allocate a new pool using an existing one as a template. More...

void	fr_pool_enable_triggers (fr_pool_t pool, char const trigger_prefix, fr_pair_list_t *trigger_args)
	Enable triggers for a connection pool. More...

void	fr_pool_free (fr_pool_t *pool)
	Delete a connection pool. More...

fr_pool_t *	fr_pool_init (TALLOC_CTX ctx, CONF_SECTION const cs, void opaque, fr_pool_connection_create_t c, fr_pool_connection_alive_t a, char const log_prefix)
	Create a new connection pool. More...

void const *	fr_pool_opaque (fr_pool_t *pool)
	Return the opaque data associated with a connection pool. More...

int	fr_pool_reconnect (fr_pool_t pool, request_t request)
	Mark connections for reconnection, and spawn at least 'start' connections. More...

void	fr_pool_reconnect_func (fr_pool_t *pool, fr_pool_reconnect_t reconnect)
	Set a reconnection callback for the connection pool. More...

void	fr_pool_ref (fr_pool_t *pool)
	Increment pool reference by one. More...

int	fr_pool_start (fr_pool_t *pool)

int	fr_pool_start_num (fr_pool_t *pool)
	Connection pool get start. More...

fr_pool_state_t const *	fr_pool_state (fr_pool_t *pool)
	Get the number of connections currently in the pool. More...

fr_time_delta_t	fr_pool_timeout (fr_pool_t *pool)
	Connection pool get timeout. More...

static void	fr_pool_trigger_exec (fr_pool_t pool, char const event)
	Send a connection pool trigger. More...

static int8_t	last_released_cmp (void const one, void const two)
	Order connections by released longest ago. More...

static int8_t	last_reserved_cmp (void const one, void const two)
	Order connections by reserved most recently. More...

static int	max_dflt (CONF_PAIR *out, UNUSED void parent, CONF_SECTION cs, fr_token_t quote, conf_parser_t const rule)

static int	max_dflt (CONF_PAIR *out, void parent, CONF_SECTION cs, fr_token_t quote, conf_parser_t const rule)

Variables
static const conf_parser_t	pool_config []

Detailed Description

Handle pools of connections (threads, sockets, etc.)

Note: This API must be used by all modules in the public distribution that maintain pools of connections.

Copyright: 2012 The FreeRADIUS server project; 2012 Alan DeKok (aland.nosp@m.@dep.nosp@m.loyin.nosp@m.grad.nosp@m.ius.c.nosp@m.om)

Definition in file pool.c.

Data Structure Documentation

◆ fr_pool_connection_s

struct fr_pool_connection_s

An individual connection within the connection pool.

Defines connection counters, timestamps, and holds a pointer to the connection handle itself.

See also: fr_pool_t

Definition at line 51 of file pool.c.

Collaboration diagram for fr_pool_connection_s:

Data Fields
void *	connection	Pointer to whatever the module uses for a connection handle.
fr_time_t	created	Time connection was created.
fr_heap_index_t	heap_id	For the next connection heap.
bool	in_use	Whether the connection is currently reserved.
fr_time_t	last_released	Time the connection was released.
fr_time_t	last_reserved	Last time the connection was reserved.
bool	needs_reconnecting	Reconnect this connection before use.
fr_pool_connection_t *	next	Next connection in list.
uint32_t	num_uses	Number of times the connection has been reserved.
uint64_t	number	Unique ID assigned when the connection is created, these will monotonically increase over the lifetime of the connection pool.
fr_pool_connection_t *	prev	Previous connection in list.

◆ fr_pool_s

struct fr_pool_s

A connection pool.

Defines the configuration of the connection pool, all the counters and timestamps related to the connection pool, the mutex that stops multiple threads leaving the pool in an inconsistent state, and the callbacks required to open, close and check the status of connections within the pool.

See also: fr_connection

Definition at line 85 of file pool.c.

Collaboration diagram for fr_pool_s:

Data Fields
fr_pool_connection_alive_t	alive	Function used to check status of connections.
fr_time_delta_t	cleanup_interval	Initial timer for how often we sweep the pool for free connections. (0 is infinite).
fr_time_delta_t	connect_timeout	New connection timeout, enforced by the create callback.
fr_pool_connection_create_t	create	Function used to create new connections.
CONF_SECTION const *	cs	Configuration section holding the section of parsed config file that relates to this pool.
fr_time_delta_t	delay_interval	When we next do a cleanup. Initialized to cleanup_interval, and increase from there based on the delay.
pthread_cond_t	done_reconnecting	Before calling the create callback, threads should block on this condition if reconnecting == true.
pthread_cond_t	done_spawn	Threads that need to ensure no spawning is in progress, should block on this condition if pending != 0.
fr_pool_connection_t *	head	Start of the connection list.
fr_heap_t *	heap	For the next connection heap.
fr_time_delta_t	held_trigger_max	If a connection is held for longer than the specified period, fire a trigger.
fr_time_delta_t	held_trigger_min	If a connection is held for less than the specified period, fire a trigger.
fr_time_delta_t	idle_timeout	How long a connection can be idle before being closed.
fr_time_delta_t	lifetime	How long a connection can be open before being closed (irrespective of whether it's idle or not).
char const *	log_prefix	Log prefix to prepend to all log messages created by the connection pool code.
uint32_t	max	Maximum number of concurrent connections to allow.
uint32_t	max_pending	Max number of pending connections to allow.
uint64_t	max_uses	Maximum number of times a connection can be used before being closed.
uint32_t	min	Minimum number of concurrent connections to keep open.
pthread_mutex_t	mutex	Mutex used to keep consistent state when making modifications in threaded mode.
void *	opaque	Pointer to context data that will be passed to callbacks.
uint32_t	pending_window	Sliding window of pending connections.
fr_pool_reconnect_t	reconnect	Called during connection pool reconnect.
int	ref	Reference counter to prevent connection pool being freed multiple times.
fr_time_delta_t	retry_delay	seconds to delay re-open after a failed open.
uint32_t	spare	Number of spare connections to try.
bool	spread	If true we spread requests over the connections, using the connection released longest ago, first.
uint32_t	start	Number of initial connections.
fr_pool_state_t	state	Stats and state of the connection pool.
fr_pool_connection_t *	tail	End of the connection list.
fr_pair_list_t	trigger_args	Arguments to make available in connection pool triggers.
char const *	trigger_prefix	Prefix to prepend to names of all triggers fired by the connection pool code.
bool	triggers_enabled	Whether we call the trigger functions.

Macro Definition Documentation

◆ LOG_PREFIX

#define LOG_PREFIX pool->log_prefix

Definition at line 28 of file pool.c.

Typedef Documentation

◆ fr_pool_connection_t

typedef struct fr_pool_connection_s fr_pool_connection_t

Definition at line 1 of file pool.c.

Function Documentation

◆ connection_check()

static int connection_check	(	fr_pool_t *	pool,
		request_t *	request
	)

static

Check whether any connections need to be removed from the pool.

Maintains the number of connections in the pool as per the configuration parameters for the connection pool.

Note: Will only run checks the first time it's called in a given second, to throttle connection spawning/closing.; Will only close connections not in use.; Must be called with the mutex held, will release mutex before returning.

Parameters

[in]	pool	to manage.
[in]	request	The current request.

Returns: 1

Definition at line 655 of file pool.c.

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◆ connection_close_internal()

static void connection_close_internal	(	fr_pool_t *	pool,
		fr_pool_connection_t *	this
	)

static

Close an existing connection.

Removes the connection from the list, calls the delete callback to close the connection, then frees memory allocated to the connection.

Note: Will call the 'close' trigger.; Must be called with the mutex held.

Parameters

[in]	pool	to modify.
[in]	this	Connection to delete.

Definition at line 547 of file pool.c.

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◆ connection_find()

static fr_pool_connection_t* connection_find	(	fr_pool_t *	pool,
		void *	conn
	)

static

Find a connection handle in the connection list.

Walks over the list of connections searching for a specified connection handle and returns the first connection that contains that pointer.

Note: Will lock mutex and only release mutex if connection handle is not found, so will usually return will mutex held.; Must be called with the mutex free.

Parameters

[in]	pool	to search in.
[in]	conn	handle to search for.

Returns

Connection containing the specified handle.
NULL if non if connection was found.

Definition at line 287 of file pool.c.

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◆ connection_get_internal()

static void* connection_get_internal	(	fr_pool_t *	pool,
		request_t *	request,
		bool	spawn
	)

static

Get a connection from the connection pool.

Note: Must be called with the mutex free.

Parameters

[in]	pool	to reserve the connection from.
[in]	request	The current request.
[in]	spawn	whether to spawn a new connection

Returns

A pointer to the connection handle.
NULL on error.

Definition at line 834 of file pool.c.

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◆ connection_link_head()

static void connection_link_head	(	fr_pool_t *	pool,
		fr_pool_connection_t *	this
	)

static

Adds a connection to the head of the connection list.

Note: Must be called with the mutex held.

Parameters

[in]	pool	to modify.
[in]	this	Connection to add.

Definition at line 232 of file pool.c.

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◆ connection_manage()

static int connection_manage	(	fr_pool_t *	pool,
		request_t *	request,
		fr_pool_connection_t *	this,
		fr_time_t	now
	)

static

Check whether a connection needs to be removed from the pool.

Will verify that the connection is within idle_timeout, max_uses, and lifetime values. If it is not, the connection will be closed.

Note: Will only close connections not in use.; Must be called with the mutex held.

Parameters

[in]	pool	to modify.
[in]	request	The current request.
[in]	this	Connection to manage.
[in]	now	Current time.

Returns

0 if connection was closed.
1 if connection handle was left open.

Definition at line 595 of file pool.c.

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◆ connection_spawn()

static fr_pool_connection_t* connection_spawn	(	fr_pool_t *	pool,
		request_t *	request,
		fr_time_t	now,
		bool	in_use,
		bool	unlock
	)

static

Spawns a new connection.

Spawns a new connection using the create callback, and returns it for adding to the connection list.

Note: Will call the 'open' trigger.; Must be called with the mutex free.

Parameters

[in]	pool	to modify.
[in]	request	The current request.
[in]	now	Current time.
[in]	in_use	whether the new connection should be "in_use" or not
[in]	unlock	whether we should unlock the mutex before returning

Returns

New connection struct.
NULL on error.

Definition at line 335 of file pool.c.

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◆ connection_unlink()

static void connection_unlink	(	fr_pool_t *	pool,
		fr_pool_connection_t *	this
	)

static

Removes a connection from the connection list.

Note: Must be called with the mutex held.

Parameters

[in]	pool	to modify.
[in]	this	Connection to delete.

Definition at line 205 of file pool.c.

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◆ fr_pool_connection_close()

int fr_pool_connection_close	(	fr_pool_t *	pool,
		request_t *	request,
		void *	conn
	)

Delete a connection from the connection pool.

Resolves the connection handle to a connection, then (if found) closes, unlinks and frees that connection.

Note: Must be called with the mutex free.

Parameters

[in]	pool	Connection pool to modify.
[in]	request	The current request.
[in]	conn	to delete.

Returns

0 If the connection could not be found.
1 if the connection was deleted.

Definition at line 1535 of file pool.c.

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◆ fr_pool_connection_get()

void* fr_pool_connection_get	(	fr_pool_t *	pool,
		request_t *	request
	)

Reserve a connection in the connection pool.

Will attempt to find an unused connection in the connection pool, if one is found, will mark it as in in use increment the number of active connections and return the connection handle.

If no free connections are found will attempt to spawn a new one, conditional on a connection spawning not already being in progress, and not being at the 'max' connection limit.

Note: fr_pool_connection_release must be called once the caller has finished using the connection.

See also: fr_pool_connection_release

Parameters

[in]	pool	to reserve the connection from.
[in]	request	The current request.

Returns

A pointer to the connection handle.
NULL on error.

Definition at line 1390 of file pool.c.

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◆ fr_pool_connection_reconnect()

void* fr_pool_connection_reconnect	(	fr_pool_t *	pool,
		request_t *	request,
		void *	conn
	)

Reconnect a suspected inviable connection.

This should be called by the module if it suspects that a connection is not viable (e.g. the server has closed it).

When implementing a module that uses the connection pool API, it is advisable to pass a pointer to the pointer to the handle (void **conn) to all functions which may call reconnect. This is so that if a new handle is created and returned, the handle pointer can be updated up the callstack, and a function higher up the stack doesn't attempt to use a now invalid connection handle.

Note: Will free any talloced memory hung off the context of the connection, being reconnected.

Warning: After calling reconnect the caller MUST NOT attempt to use the old handle in any other operations, as its memory will have been freed.

See also: fr_pool_connection_get

Parameters

[in]	pool	to reconnect the connection in.
[in]	request	The current request.
[in]	conn	to reconnect.

Returns: new connection handle if successful else NULL.

Definition at line 1498 of file pool.c.

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◆ fr_pool_connection_release()

void fr_pool_connection_release	(	fr_pool_t *	pool,
		request_t *	request,
		void *	conn
	)

Release a connection.

Will mark a connection as unused and decrement the number of active connections.

See also: fr_pool_connection_get

Parameters

[in]	pool	to release the connection in.
[in]	request	The current request.
[in]	conn	to release.

Definition at line 1405 of file pool.c.

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◆ fr_pool_copy()

fr_pool_t* fr_pool_copy	(	TALLOC_CTX *	ctx,
		fr_pool_t *	pool,
		void *	opaque
	)

Allocate a new pool using an existing one as a template.

Parameters

[in]	ctx	to allocate new pool in.
[in]	pool	to copy.
[in]	opaque	data to pass to connection function.

Returns

New connection pool.
NULL on error.

Definition at line 1154 of file pool.c.

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◆ fr_pool_enable_triggers()

void fr_pool_enable_triggers	(	fr_pool_t *	pool,
		char const *	trigger_prefix,
		fr_pair_list_t *	trigger_args
	)

Enable triggers for a connection pool.

Parameters

[in] pool to enable triggers for.

[in]

trigger_prefix

prefix to prepend to all trigger names. Usually a path to the module's trigger configuration .e.g.

modules.<name>.pool

<trigger name>

is appended to form the complete path.

[in] trigger_args to make available in any triggers executed by the connection pool. These will usually be fr_pair_t (s) describing the host associated with the pool. Trigger args will be copied, input trigger_args should be freed if necessary.

Definition at line 931 of file pool.c.

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◆ fr_pool_free()

void fr_pool_free ( fr_pool_t * pool )

Delete a connection pool.

Closes, unlinks and frees all connections in the connection pool, then frees all memory used by the connection pool.

Note: Will call the 'stop' trigger.; Must be called with the mutex free.

Parameters

[in,out] pool to delete.

Definition at line 1327 of file pool.c.

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◆ fr_pool_init()

fr_pool_t* fr_pool_init	(	TALLOC_CTX *	ctx,
		CONF_SECTION const *	cs,
		void *	opaque,
		fr_pool_connection_create_t	c,
		fr_pool_connection_alive_t	a,
		char const *	log_prefix
	)

Create a new connection pool.

Allocates structures used by the connection pool, initialises the various configuration options and counters, and sets the callback functions.

Will also spawn the number of connections specified by the 'start' configuration option.

Note: Will call the 'start' trigger.

Parameters

[in]	ctx	Context to link pool's destruction to.
[in]	cs	pool section.
[in]	opaque	data pointer to pass to callbacks.
[in]	c	Callback to create new connections.
[in]	a	Callback to check the status of connections.
[in]	log_prefix	prefix to prepend to all log messages.

Returns

New connection pool.
NULL on error.

Definition at line 965 of file pool.c.

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◆ fr_pool_opaque()

void const* fr_pool_opaque ( fr_pool_t * pool )

Return the opaque data associated with a connection pool.

Parameters

pool	to return data for.

Returns: opaque data associated with pool.

Definition at line 1201 of file pool.c.

◆ fr_pool_reconnect()

int fr_pool_reconnect	(	fr_pool_t *	pool,
		request_t *	request
	)

Mark connections for reconnection, and spawn at least 'start' connections.

Note: This call may block whilst waiting for pending connection attempts to complete.

This intended to be called on a connection pool that's in use, to have it reflect a configuration change, or because the administrator knows that all connections in the pool are inviable and need to be reconnected.

Parameters

[in]	pool	to reconnect.
[in]	request	The current request.

Returns

0 On success.
-1 If we couldn't create start connections, this may be ignored depending on the context in which this function is being called.

Definition at line 1242 of file pool.c.

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◆ fr_pool_reconnect_func()

void fr_pool_reconnect_func	(	fr_pool_t *	pool,
		fr_pool_reconnect_t	reconnect
	)

Set a reconnection callback for the connection pool.

This can be called at any time during the pool's lifecycle.

Parameters

[in]	pool	to set reconnect callback for.
	reconnect	callback to call when reconnecting pool's connections.

Definition at line 1222 of file pool.c.

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◆ fr_pool_ref()

void fr_pool_ref ( fr_pool_t * pool )

Increment pool reference by one.

Parameters

[in] pool to increment reference counter for.

Definition at line 1210 of file pool.c.

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◆ fr_pool_start()

int fr_pool_start ( fr_pool_t * pool )

Definition at line 1114 of file pool.c.

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◆ fr_pool_start_num()

int fr_pool_start_num ( fr_pool_t * pool )

Connection pool get start.

Parameters

[in] pool to get connection start for.

Returns: the connection start value configured for the pool.

Definition at line 1191 of file pool.c.

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◆ fr_pool_state()

fr_pool_state_t const* fr_pool_state ( fr_pool_t * pool )

Get the number of connections currently in the pool.

Parameters

[in] pool to count connections for.

Returns: the number of connections in the pool

Definition at line 1171 of file pool.c.

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◆ fr_pool_timeout()

fr_time_delta_t fr_pool_timeout ( fr_pool_t * pool )

Connection pool get timeout.

Parameters

[in] pool to get connection timeout for.

Returns: the connection timeout configured for the pool.

Definition at line 1181 of file pool.c.

◆ fr_pool_trigger_exec()

static void fr_pool_trigger_exec	(	fr_pool_t *	pool,
		char const *	event
	)

inlinestatic

Send a connection pool trigger.

Parameters

[in]	pool	to send trigger for.
[in]	event	trigger name suffix.

Definition at line 259 of file pool.c.

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◆ last_released_cmp()

static int8_t last_released_cmp	(	void const *	one,
		void const *	two
	)

static

Order connections by released longest ago.

Definition at line 191 of file pool.c.

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◆ last_reserved_cmp()

static int8_t last_reserved_cmp	(	void const *	one,
		void const *	two
	)

static

Order connections by reserved most recently.

Definition at line 182 of file pool.c.

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◆ max_dflt() [1/2]

static int max_dflt	(	CONF_PAIR **	out,
		UNUSED void *	parent,
		CONF_SECTION *	cs,
		fr_token_t	quote,
		conf_parser_t const *	rule
	)

static

Definition at line 169 of file pool.c.

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◆ max_dflt() [2/2]

static int max_dflt	(	CONF_PAIR **	out,
		void *	parent,
		CONF_SECTION *	cs,
		fr_token_t	quote,
		conf_parser_t const *	rule
	)

static

Variable Documentation

◆ pool_config

const conf_parser_t pool_config[]

static

Initial value:

= {
        { FR_CONF_OFFSET("start", fr_pool_t, start), .dflt = "0" },
        { FR_CONF_OFFSET("min", fr_pool_t, min), .dflt = "0" },
        { FR_CONF_OFFSET("max", fr_pool_t, max), .dflt_func = max_dflt },
        { FR_CONF_OFFSET("max_pending", fr_pool_t, max_pending), .dflt = "0" },
        { FR_CONF_OFFSET("spare", fr_pool_t, spare), .dflt = "3" },
        { FR_CONF_OFFSET("uses", fr_pool_t, max_uses), .dflt = "0" },
        { FR_CONF_OFFSET("lifetime", fr_pool_t, lifetime), .dflt = "0" },
        { FR_CONF_OFFSET("cleanup_interval", fr_pool_t, cleanup_interval), .dflt = "30" },
        { FR_CONF_OFFSET("idle_timeout", fr_pool_t, idle_timeout), .dflt = "60" },
        { FR_CONF_OFFSET("connect_timeout", fr_pool_t, connect_timeout), .dflt = "3.0" },
        { FR_CONF_OFFSET("held_trigger_min", fr_pool_t, held_trigger_min), .dflt = "0.0" },
        { FR_CONF_OFFSET("held_trigger_max", fr_pool_t, held_trigger_max), .dflt = "0.5" },
        { FR_CONF_OFFSET("retry_delay", fr_pool_t, retry_delay), .dflt = "1" },
        { FR_CONF_OFFSET("spread", fr_pool_t, spread), .dflt = "no" },
        CONF_PARSER_TERMINATOR
}

Definition at line 151 of file pool.c.

Data Structures

Macros

Typedefs

Functions

Variables

Detailed Description

Data Structure Documentation

◆ fr_pool_connection_s

◆ fr_pool_s

Macro Definition Documentation

◆ LOG_PREFIX

Typedef Documentation

◆ fr_pool_connection_t

Function Documentation

◆ connection_check()

◆ connection_close_internal()

◆ connection_find()

◆ connection_get_internal()

◆ connection_link_head()

◆ connection_manage()

◆ connection_spawn()

◆ connection_unlink()

◆ fr_pool_connection_close()

◆ fr_pool_connection_get()

◆ fr_pool_connection_reconnect()

◆ fr_pool_connection_release()

◆ fr_pool_copy()

◆ fr_pool_enable_triggers()

◆ fr_pool_free()

◆ fr_pool_init()

◆ fr_pool_opaque()

◆ fr_pool_reconnect()

◆ fr_pool_reconnect_func()

◆ fr_pool_ref()

◆ fr_pool_start()

◆ fr_pool_start_num()

◆ fr_pool_state()

◆ fr_pool_timeout()

◆ fr_pool_trigger_exec()

◆ last_released_cmp()

◆ last_reserved_cmp()

◆ max_dflt() [1/2]

◆ max_dflt() [2/2]

Variable Documentation

◆ pool_config