Functions for pipelining commands. More...

#include <freeradius-devel/server/connection.h>
#include <freeradius-devel/server/trunk.h>
#include "pipeline.h"
#include "io.h"

Include dependency graph for pipeline.c:

Go to the source code of this file.

Data Structures
struct	fr_redis_cluster_thread_s
	Thread local state for a cluster. More...

struct	fr_redis_command_s
	Represents a single command. More...

struct	fr_redis_command_set_s
	Represents a collection of pipelined commands. More...

struct	fr_redis_trunk_s

Macros
#define	COMMAND_PRE_ALLOC_COUNT 8

#define	COMMAND_PRE_ALLOC_LEN 64

Enumerations
enum	fr_redis_command_type_t { FR_REDIS_COMMAND_NORMAL = 0 , FR_REDIS_COMMAND_TRANSACTION_START , FR_REDIS_COMMAND_TRANSACTION_END }

Functions
static int	_command_set_free_list_free_on_exit (void *arg)
	Free any free requests when the thread is joined. More...

static int	_redis_command_free (fr_redis_command_t *cmd)
	Free any result associated with the command. More...

static int	_redis_command_set_free (fr_redis_command_set_t *cmds)
	Free a command set. More...

static void	_redis_pipeline_command_set_cancel (connection_t conn, UNUSED trunk_request_t treq, void preq, trunk_cancel_reason_t reason, UNUSED void uctx)
	Deal with cancellation of sent requests. More...

static void	_redis_pipeline_command_set_complete (UNUSED request_t request, void preq, UNUSED void rctx, UNUSED void uctx)
	Signal the API client that we got a complete set of responses to a command set. More...

static void	_redis_pipeline_command_set_fail (UNUSED request_t request, void preq, UNUSED void rctx, UNUSED void uctx)
	Signal the API client that we failed enqueuing the commands. More...

static void	_redis_pipeline_command_set_free (UNUSED request_t request, void preq, UNUSED void *uctx)
	Free the command set. More...

static connection_t *	_redis_pipeline_connection_alloc (trunk_connection_t tconn, fr_event_list_t el, connection_conf_t const conf, char const log_prefix, void *uctx)

static void	_redis_pipeline_demux (struct redisAsyncContext ac, void vreply, void *privdata)
	Callback for for receiving Redis replies. More...

static void	_redis_pipeline_mux (trunk_connection_t tconn, connection_t conn, UNUSED void *uctx)
	Enqueue one or more command sets onto a redis handle. More...

fr_redis_cluster_thread_t *	fr_redis_cluster_thread_alloc (TALLOC_CTX ctx, fr_event_list_t el, trunk_conf_t const *tconf)
	Allocate per-thread, per-cluster instance. More...

redisReply *	fr_redis_command_get_result (fr_redis_command_t *cmd)

fr_redis_pipeline_status_t	fr_redis_command_preformatted_add (fr_redis_command_set_t cmds, char const cmd_str, size_t cmd_len)
	Add a preformatted/expanded command to the command set. More...

fr_redis_command_set_t *	fr_redis_command_set_alloc (TALLOC_CTX ctx, request_t request, fr_redis_command_set_complete_t complete, fr_redis_command_set_fail_t fail, void *rctx)
	Allocate a new command set. More...

fr_redis_trunk_t *	fr_redis_trunk_alloc (fr_redis_cluster_thread_t cluster_thread, fr_redis_io_conf_t const io_conf)
	Allocate a new trunk. More...

fr_redis_pipeline_status_t	redis_command_set_enqueue (fr_redis_trunk_t rtrunk, fr_redis_command_set_t cmds)
	Enqueue a command set on a specific trunk. More...

Variables
static _Thread_local fr_dlist_head_t *	command_set_free_list
	The thread local free list. More...

Detailed Description

Functions for pipelining commands.

Id: 2cf5735c8be7881c78af69da0b0ce96a85a1ef0d

Copyright: 2019 The FreeRADIUS server project; 2019 Network RADIUS SAS (legal.nosp@m.@net.nosp@m.workr.nosp@m.adiu.nosp@m.s.com)

Author: 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 pipeline.c.

Data Structure Documentation

◆ fr_redis_cluster_thread_s

struct fr_redis_cluster_thread_s

Thread local state for a cluster.

MOVE ME TO NEW ASYNC CLUSTER CODE

Definition at line 39 of file pipeline.c.

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Data Fields
bool	delay_start	Prevent connections from spawning immediately.
fr_event_list_t *	el
char *	log_prefix	Common log prefix to use for all cluster related messages.
trunk_conf_t const *	tconf	Configuration for all trunks in the cluster.

◆ fr_redis_command_s

struct fr_redis_command_s

Represents a single command.

Definition at line 67 of file pipeline.c.

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Data Fields
fr_redis_command_set_t *	cmds	Command set this entry belongs to.
fr_dlist_t	entry	Entry in the command buffer.
size_t	len	Length of the command string.
redisReply *	result	The result from the REDIS server.
uint64_t	sqn	The sequence number of the command. This is only valid for a specific handle, and is unique within the handle.
char const *	str	The command string.
fr_redis_command_type_t	type	Redis command type.

◆ fr_redis_command_set_s

struct fr_redis_command_set_s

Represents a collection of pipelined commands.

Commands MUST map to the same cluster node if using clustering.

Definition at line 87 of file pipeline.c.

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Data Fields
fr_redis_command_set_complete_t	complete	Notify the creator of the command set that the command set has executed to to completion. We have results for all commands.
fr_dlist_head_t	completed	Commands complete with replies.
fr_dlist_t	entry
fr_redis_command_set_fail_t	fail	Notify the creator of the command set that the command set failed to execute to completion. Partial results will be available.
fr_dlist_head_t	pending	Commands yet to be sent.
void *	rctx	Resume context to write results to.
uint8_t	redirected	How many times this command set was redirected.
request_t *	request	Request this commands set is associated with (if any).
fr_dlist_head_t	sent	Commands sent.
trunk_request_t *	treq	Trunk request this command set is associated with.
uint16_t	txn_end	The number of times a transaction block ended in this command set.
uint16_t	txn_start	Number of times a transaction block was started in this command set.
bool	txn_watch	Transaction was started with a watch statement.

◆ fr_redis_trunk_s

struct fr_redis_trunk_s

Definition at line 144 of file pipeline.c.

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Data Fields
fr_redis_cluster_thread_t *	cluster	Cluster this trunk belongs to.
fr_redis_io_conf_t const *	io_conf	Redis I/O configuration. Specifies how to connect to the host this trunk is used to communicate with.
trunk_t *	trunk	Trunk containing all the connections to a specific. host.

Macro Definition Documentation

◆ COMMAND_PRE_ALLOC_COUNT

#define COMMAND_PRE_ALLOC_COUNT 8

◆ COMMAND_PRE_ALLOC_LEN

#define COMMAND_PRE_ALLOC_LEN 64

Enumeration Type Documentation

◆ fr_redis_command_type_t

enum fr_redis_command_type_t

Enumerator

FR_REDIS_COMMAND_NORMAL

A normal, non-transactional command.

FR_REDIS_COMMAND_TRANSACTION_START

Start of a transaction block.

Either WATCH or MULTI. if a transaction is started with WATCH, then multi is not marked up as a transaction start.

FR_REDIS_COMMAND_TRANSACTION_END

End of a transaction block.

Either EXEC or DISCARD. If this command fails with MOVED or ASK, all commands back to the previous MULTI command must be requeued.

Definition at line 53 of file pipeline.c.

Function Documentation

◆ _command_set_free_list_free_on_exit()

static int _command_set_free_list_free_on_exit ( void * arg )

static

Free any free requests when the thread is joined.

Definition at line 155 of file pipeline.c.

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◆ _redis_command_free()

static int _redis_command_free ( fr_redis_command_t * cmd )

static

Free any result associated with the command.

Parameters

[in] cmd to free. Frees any redis results associated with the command.

Definition at line 263 of file pipeline.c.

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◆ _redis_command_set_free()

static int _redis_command_set_free ( fr_redis_command_set_t * cmds )

static

Free a command set.

Definition at line 170 of file pipeline.c.

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◆ _redis_pipeline_command_set_cancel()

static void _redis_pipeline_command_set_cancel	(	connection_t *	conn,
		UNUSED trunk_request_t *	treq,
		void *	preq,
		trunk_cancel_reason_t	reason,
		UNUSED void *	uctx
	)

static

Deal with cancellation of sent requests.

We can't actually signal redis to not process the request, so depending on why the commands were cancelled, we either tell the handle to ignore them, or move them back into the pending list.

Definition at line 522 of file pipeline.c.

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◆ _redis_pipeline_command_set_complete()

static void _redis_pipeline_command_set_complete	(	UNUSED request_t *	request,
		void *	preq,
		UNUSED void *	rctx,
		UNUSED void *	uctx
	)

static

Signal the API client that we got a complete set of responses to a command set.

Definition at line 577 of file pipeline.c.

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◆ _redis_pipeline_command_set_fail()

static void _redis_pipeline_command_set_fail	(	UNUSED request_t *	request,
		void *	preq,
		UNUSED void *	rctx,
		UNUSED void *	uctx
	)

static

Signal the API client that we failed enqueuing the commands.

Definition at line 588 of file pipeline.c.

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◆ _redis_pipeline_command_set_free()

static void _redis_pipeline_command_set_free	(	UNUSED request_t *	request,
		void *	preq,
		UNUSED void *	uctx
	)

static

Free the command set.

Definition at line 599 of file pipeline.c.

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◆ _redis_pipeline_connection_alloc()

static connection_t* _redis_pipeline_connection_alloc	(	trunk_connection_t *	tconn,
		fr_event_list_t *	el,
		connection_conf_t const *	conf,
		char const *	log_prefix,
		void *	uctx
	)

static

Definition at line 464 of file pipeline.c.

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◆ _redis_pipeline_demux()

static void _redis_pipeline_demux	(	struct redisAsyncContext *	ac,
		void *	vreply,
		void *	privdata
	)

static

Callback for for receiving Redis replies.

This is called by hiredis for each response is receives. privData is set to the fr_command_set

Note: Called only from hiredis, not the trunk itself.

Parameters

[in]	ac	The async context the command was enqueued on.
[in]	vreply	redisReply containing the result of the command.
[in]	privdata	fr_redis_command_t that was sent to the Redis server. The fr_redis_command_t contains a pointer to the fr_redis_command_set_t which holds the treq which we use to signal that we have responses for all commands.

Definition at line 427 of file pipeline.c.

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◆ _redis_pipeline_mux()

static void _redis_pipeline_mux	(	trunk_connection_t *	tconn,
		connection_t *	conn,
		UNUSED void *	uctx
	)

static

Enqueue one or more command sets onto a redis handle.

Because the trunk is in always writable mode, _redis_pipeline_mux will be called any time trunk_request_enqueue is called, so there'll only ever be one command to dequeue.

Parameters

[in]	tconn	Trunk connection holding the commands to enqueue.
[in]	conn	Connection handle containing the fr_redis_handle_t.
[in]	uctx	fr_redis_cluster_t. Unused.

Definition at line 483 of file pipeline.c.

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◆ fr_redis_cluster_thread_alloc()

fr_redis_cluster_thread_t* fr_redis_cluster_thread_alloc	(	TALLOC_CTX *	ctx,
		fr_event_list_t *	el,
		trunk_conf_t const *	tconf
	)

Allocate per-thread, per-cluster instance.

This structure represents all the connections for a given thread for a given cluster. The structures holds the trunk connections to talk to each cluster member.

Definition at line 647 of file pipeline.c.

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◆ fr_redis_command_get_result()

redisReply* fr_redis_command_get_result ( fr_redis_command_t * cmd )

Definition at line 270 of file pipeline.c.

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◆ fr_redis_command_preformatted_add()

fr_redis_pipeline_status_t fr_redis_command_preformatted_add	(	fr_redis_command_set_t *	cmds,
		char const *	cmd_str,
		size_t	cmd_len
	)

Add a preformatted/expanded command to the command set.

The command must either be entirely static, or parented by the command set.

Note: Caller should disallow "SUBSCRIBE" et al, if they're not appropriate. As subscribing to a stream where we're not expecting it would break things, badly.

Parameters

[in]	cmds	Command set to add command to.
[in]	cmd_str	A fully expanded/formatted command to send to redis. Must be static, or have the same lifetime as the command set (allocated with the command set as the parent).
[in]	cmd_len	Length of the command.

Returns

FR_REDIS_PIPELINE_BAD_CMDS if a bad command sequence is enqueued.
FR_REDIS_PIPELINE_OK if command was enqueued successfully.

Definition at line 292 of file pipeline.c.

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◆ fr_redis_command_set_alloc()

fr_redis_command_set_t* fr_redis_command_set_alloc	(	TALLOC_CTX *	ctx,
		request_t *	request,
		fr_redis_command_set_complete_t	complete,
		fr_redis_command_set_fail_t	fail,
		void *	rctx
	)

Allocate a new command set.

This is a set of commands that the calling module wants to execute on the redis server in sequence.

Control will be returned to the caller via the registered complete and fail functions.

Parameters

[in]	ctx	to bind the command set's lifetime to.
[in]	request	to pass to places that need it.
[in]	complete	Function to call when all commands have been processed.
[in]	fail	Function to call if the command set was not executed or was partially executed.
[in]	rctx	Resume context to pass to complete and fail functions.

Returns: A new or refurbished command set.

Definition at line 206 of file pipeline.c.

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◆ fr_redis_trunk_alloc()

fr_redis_trunk_t* fr_redis_trunk_alloc	(	fr_redis_cluster_thread_t *	cluster_thread,
		fr_redis_io_conf_t const *	io_conf
	)

Allocate a new trunk.

Parameters

[in]	cluster_thread	to allocate the trunk for.
[in]	io_conf	Describing the connection to a single REDIS host.

Returns

On success, a new fr_redis_trunk_t which can be used for pipelining commands.
NULL on failure.

Definition at line 615 of file pipeline.c.

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◆ redis_command_set_enqueue()

fr_redis_pipeline_status_t redis_command_set_enqueue	(	fr_redis_trunk_t *	rtrunk,
		fr_redis_command_set_t *	cmds
	)

Enqueue a command set on a specific trunk.

The command set may be passed around several trunks before it is complete. This is to allow it to follow MOVED and ASK responses.

Parameters

[in]	rtrunk	to enqueue command set on.
[in]	cmds	Command set to enqueue.

Returns

FR_REDIS_PIPELINE_OK if commands were immediately enqueued or placed in the backlog.
FR_REDIS_PIPELINE_DST_UNAVAILABLE if the REDIS host is unreachable.
FR_REDIS_PIPELINE_FAIL any other general error.

Definition at line 392 of file pipeline.c.

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Variable Documentation

◆ command_set_free_list

_Thread_local fr_dlist_head_t* command_set_free_list

static

The thread local free list.

Any entries remaining in the list will be freed when the thread is joined

Definition at line 51 of file pipeline.c.

Data Structures

Macros

Enumerations

Functions

Variables

Detailed Description

Data Structure Documentation

◆ fr_redis_cluster_thread_s

◆ fr_redis_command_s

◆ fr_redis_command_set_s

◆ fr_redis_trunk_s

Macro Definition Documentation

◆ COMMAND_PRE_ALLOC_COUNT

◆ COMMAND_PRE_ALLOC_LEN

Enumeration Type Documentation

◆ fr_redis_command_type_t

Function Documentation

◆ _command_set_free_list_free_on_exit()

◆ _redis_command_free()

◆ _redis_command_set_free()

◆ _redis_pipeline_command_set_cancel()

◆ _redis_pipeline_command_set_complete()

◆ _redis_pipeline_command_set_fail()

◆ _redis_pipeline_command_set_free()

◆ _redis_pipeline_connection_alloc()

◆ _redis_pipeline_demux()

◆ _redis_pipeline_mux()

◆ fr_redis_cluster_thread_alloc()

◆ fr_redis_command_get_result()

◆ fr_redis_command_preformatted_add()

◆ fr_redis_command_set_alloc()

◆ fr_redis_trunk_alloc()

◆ redis_command_set_enqueue()

Variable Documentation

◆ command_set_free_list