rlm_redis.c

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/*
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or (at
 *   your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/**
 * $Id: ce9b8c4a26e48aebc6fb3146a19959bb4fe56504 $
 * @file rlm_redis.c
 * @brief Driver for the Redis noSQL key value store.
 *
 * @author Gabriel Blanchard
 *
 * @copyright 2015 Arran Cudbard-Bell (a.cudbardb@freeradius.org)
 * @copyright 2011 TekSavvy Solutions (gabe@teksavvy.com)
 * @copyright 2000,2006,2015 The FreeRADIUS server project
 */
 
RCSID("$Id: ce9b8c4a26e48aebc6fb3146a19959bb4fe56504 $")
 
#include <assert.h>
#include <stdint.h>
 
#include <freeradius-devel/redis/base.h>
#include <freeradius-devel/redis/cluster_async.h>
 
#include <freeradius-devel/server/modpriv.h>
#include <freeradius-devel/server/module_rlm.h>
#include <freeradius-devel/io/coord_pair.h>
 
#include <freeradius-devel/unlang/xlat_func.h>
 
#include <freeradius-devel/util/base16.h>
#include <freeradius-devel/util/debug.h>
#include <freeradius-devel/util/types.h>
 
static fr_dict_t const *dict_redis;
 
extern fr_dict_autoload_t rlm_redis_dict[];
fr_dict_autoload_t rlm_redis_dict[] = {
        { .out = &dict_redis, .proto = "redis" },
        DICT_AUTOLOAD_TERMINATOR
};
 
/** A lua function or stored procedure we make available as an xlat
 *
 */
typedef struct {
        char const              *name;                                  //!< Friendly name for the function.  Used to register the equivalent xlat.
        char                    digest[(SHA1_DIGEST_LENGTH * 2) + 1];   //!< pre-computed hash of lua code.
        char const              *body;                                  //!< the actual lua code.
        bool                    read_only;                              //!< Function has no side effects
} redis_lua_func_t;
 
/** Instance of a redis lua func xlat
 *
 */
typedef struct {
        redis_lua_func_t        *func;                                  //!< Function configuration.
} redis_lua_func_inst_t;
 
 
typedef struct {
        redis_lua_func_t        **funcs;                                //!< Array of functions to register.
 
} rlm_redis_lua_t;
 
/** rlm_redis module instance
 *
 */
typedef struct {
        fr_redis_conf_t         conf;                                   //!< Connection parameters for the Redis server.
                                                                        //!< Must be first field in this struct.
 
 
        rlm_redis_lua_t         lua;                                    //!< Array of functions to register.
 
        fr_coord_reg_t          *coord_reg;                             //!< Coordinator registration.
        fr_coord_pair_reg_t     *coord_pair_reg;                        //!< Coord pair registration.
} rlm_redis_t;
 
typedef struct {
        rlm_redis_t const       *inst;                                  //!< Module instance.
        fr_redis_ct_t           *rtcluster;                             //!< Per thread Redis cluster.
        fr_coord_worker_t       *cw;                                    //!< Coord-worker for fetching cluster map.
} rlm_redis_thread_t;
 
/** Resume context for redis lua xlat
 */
typedef struct {
        redis_lua_func_t const  *func;                                  //!< Lua function
        TALLOC_CTX              *ctx;                                   //!< Context to allocate boxes.
        fr_value_box_list_t     out;                                    //!< List to store boxes in callback.
        xlat_action_t           action;                                 //!< Xlat action set in callback.
        fr_redis_command_set_t  *cmds;                                  //!< Command set for this xlat.
        fr_redis_async_cmd_t    *cmd;                                   //!< Async command context.
} rlm_redis_lua_xlat_rctx_t;
 
/** Resume context for redis xlat
 */
typedef struct {
        bool                    read_only;                              //!< Should the xlat be run read only.
        bool                    forced_node;                            //!< Was the xlat called with a specific node.
        TALLOC_CTX              *ctx;                                   //!< Context to allocate boxes.
        fr_value_box_list_t     out;                                    //!< List to store boxes in callback.
        xlat_action_t           action;                                 //!< Xlat action set in callback.
        fr_redis_command_set_t  *cmds;                                  //!< Command set for this xlat.
        fr_redis_async_cmd_t    *cmd;                                   //!< Async command context.
} rlm_redis_xlat_rctx_t;
 
#define REDIS_XLAT_CMD_SETUP(_cmds, _argc, _argv, _arg_len, _rctx, _read_only, _func) \
if (_read_only && \
    (fr_redis_command_literal_add(_cmds, "READONLY", redis_xlat_status_check, _rctx) != FR_REDIS_PIPELINE_OK)) \
        return XLAT_ACTION_FAIL; \
if (fr_redis_command_argv_add(_cmds, _argc, _argv, _arg_len, _func, _rctx) != FR_REDIS_PIPELINE_OK) \
        return XLAT_ACTION_FAIL; \
if (_read_only && \
    (fr_redis_command_literal_add(_cmds, "READWRITE", redis_xlat_status_check, _rctx) != FR_REDIS_PIPELINE_OK)) \
        return XLAT_ACTION_FAIL
 
static int lua_func_body_parse(TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, conf_parser_t const *rule);
 
static conf_parser_t module_lua_func[] = {
        { FR_CONF_OFFSET("body", redis_lua_func_t, body), .func = lua_func_body_parse },
        { FR_CONF_OFFSET("read_only", redis_lua_func_t, read_only) },
        CONF_PARSER_TERMINATOR
};
 
static conf_parser_t module_lua[] = {
        { FR_CONF_SUBSECTION_ALLOC_MULTI("function", CONF_FLAG_OK_MISSING, rlm_redis_lua_t, funcs, module_lua_func),
                                   .subcs_type = "redis_lua_func_t", .name2 = CF_IDENT_ANY },
        CONF_PARSER_TERMINATOR
};
 
static conf_parser_t module_config[] = {
        { FR_CONF_OFFSET_SUBSECTION("lua", 0, rlm_redis_t, lua, module_lua) },
        REDIS_COMMON_CONFIG,
        CONF_PARSER_TERMINATOR
};
 
/** Do basic processing for a lua function body and compute its sha1 hash
 *
 */
static int lua_func_body_parse(TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, conf_parser_t const *rule)
{
        int                     ret;
        redis_lua_func_t        *func = talloc_get_type_abort(parent, redis_lua_func_t);
        char const              *body;
        fr_sha1_ctx             sha1_ctx;
        uint8_t                 digest[SHA1_DIGEST_LENGTH];
 
        /*
         *      Get the function name from name2
         *      of the enclosing function section.
         */
        func->name = cf_section_name2(cf_item_to_section(cf_parent(ci)));
        if (unlikely(!func->name)) {
                cf_log_err(cf_parent(ci), "functions must be declared as \"function <name> {\"");
                return -1;
        }
 
        /*
         *      Perform normal string parsing first
         */
        if ((ret = cf_pair_parse_value(ctx, out, parent, ci, rule)) < 0) return ret;
        body = *((char **)out);
 
        fr_sha1_init(&sha1_ctx);
        fr_sha1_update(&sha1_ctx, (uint8_t const *)body, talloc_strlen(body));
        fr_sha1_final(digest, &sha1_ctx);
        fr_base16_encode(&FR_SBUFF_OUT(func->digest, sizeof(func->digest)), &FR_DBUFF_TMP(digest, sizeof(digest)));
 
        if (DEBUG_ENABLED3) cf_log_debug(ci, "sha1 hash of function is %pV", fr_box_strvalue_len(func->digest, sizeof(func->digest) - 1));
 
        return 0;
}
 
/** Callback to check redis replied with "OK" when expected.
 */
static void redis_xlat_status_check(request_t *request, fr_redis_command_t *cmd, redisReply *reply, void *rctx)
{
        rlm_redis_xlat_rctx_t   *xlat_rctx = talloc_get_type_abort(rctx, rlm_redis_xlat_rctx_t);
 
        if (reply->type  != REDIS_REPLY_STATUS) {
                RWARN("Did not receive expected redis status reply");
                xlat_rctx->action = XLAT_ACTION_FAIL;
                return;
        }
 
        if (strcmp(reply->str, "OK") != 0) {
                RERROR("Running \"%s\" returned %s", fr_redis_command_get_cmd(cmd), reply->str);
                xlat_rctx->action = XLAT_ACTION_FAIL;
        }
}
 
/** Callback to check redis replied with "PONG" when expected.
 */
static void redis_xlat_ping_check(request_t *request, fr_redis_command_t *cmd, redisReply *reply, void *rctx)
{
        rlm_redis_xlat_rctx_t   *xlat_rctx = talloc_get_type_abort(rctx, rlm_redis_xlat_rctx_t);
 
        if (reply->type  != REDIS_REPLY_STATUS) {
                RWARN("Did not receive expected redis status reply");
                return;
        }
 
        if (strcmp(reply->str, "PONG") != 0) {
                RERROR("Running \"%s\" returned %s", fr_redis_command_get_cmd(cmd), reply->str);
                return;
        }
        xlat_rctx->action = XLAT_ACTION_DONE;
}
 
/** Common cancellation for redis xlats
 *
 */
static void redis_xlat_cancel(xlat_ctx_t const *xctx, request_t *request, UNUSED fr_signal_t action)
{
        rlm_redis_xlat_rctx_t   *rctx = talloc_get_type_abort(xctx->rctx, rlm_redis_xlat_rctx_t);
 
        RDEBUG2("Forcibly cancelling pending redis command");
        fr_redis_async_cmd_cancel(rctx->cmd);
}
 
static xlat_action_t redis_remap_xlat_resume(TALLOC_CTX *ctx, fr_dcursor_t *out, xlat_ctx_t const *xctx,
                                             request_t *request, UNUSED fr_value_box_list_t *in)
{
        rlm_redis_xlat_rctx_t   *rctx = talloc_get_type_abort(xctx->rctx, rlm_redis_xlat_rctx_t);
        fr_value_box_t          *vb = NULL;
 
        if (rctx->action != XLAT_ACTION_DONE) {
                RPERROR("PING after cluster remap failed");
                return rctx->action;
        }
 
        MEM(vb = fr_value_box_alloc_null(ctx));
        switch (fr_redis_command_set_rcode(rctx->cmds)) {
        case REDIS_ASYNC_RCODE_SUCCESS:
                fr_value_box_strdup(vb, vb, NULL, "success", false);
                break;
        default:
                fr_value_box_strdup(vb, vb, NULL, "fail", false);
        }
 
        fr_dcursor_append(out, vb);
 
        return XLAT_ACTION_DONE;
}
 
/** Force a redis cluster remap
 *
@verbatim
%redis.remap()
@endverbatim
 *
 * @ingroup xlat_functions
 */
static xlat_action_t redis_remap_xlat(TALLOC_CTX *ctx, UNUSED fr_dcursor_t *out,
                                      xlat_ctx_t const *xctx,
                                      request_t *request, UNUSED fr_value_box_list_t *in)
{
        rlm_redis_t const       *inst = talloc_get_type_abort_const(xctx->mctx->mi->data, rlm_redis_t);
        rlm_redis_thread_t      *thread = talloc_get_type_abort(xctx->mctx->thread, rlm_redis_thread_t);
 
        fr_redis_command_set_t  *cmds;
        rlm_redis_xlat_rctx_t   *rctx;
        fr_redis_async_rcode_t  ret;
 
        if (!inst->conf.use_cluster_map) {
                RWARN("Cluster map not in use");
                return XLAT_ACTION_DONE;
        }
 
        if (fr_redis_ct_map_get(thread->rtcluster, thread->cw,
                                inst->coord_pair_reg, true) == REDIS_ASYNC_RCODE_ERROR) {
                RPEDEBUG("Failed to initiate cluster remap");
                return XLAT_ACTION_FAIL;
        }
 
        /*
         *      Since cluster remap is out of band, using the coordinator thread, queue up
         *      a "PING" command which will run after the remap.
         *      In addition, if the cluster map has not been previously fetched, this will
         *      bootstrap the cluster map fetching.
         *      The xlat will return after the remap has completed.
         */
        MEM(rctx = talloc_zero(unlang_interpret_frame_talloc_ctx(request), rlm_redis_xlat_rctx_t));
        rctx->ctx = ctx;
        rctx->action = XLAT_ACTION_FAIL;
 
        MEM(cmds = fr_redis_command_set_alloc(rctx, request, NULL, NULL, NULL, false));
        rctx->cmds = cmds;
        if (fr_redis_command_literal_add(cmds, "PING", redis_xlat_ping_check, rctx) != FR_REDIS_PIPELINE_OK) {
                talloc_free(rctx);
                return XLAT_ACTION_FAIL;
        }
 
        rctx->cmd = fr_redis_async_cmd_start(unlang_interpret_frame_talloc_ctx(request), request, &ret,
                                             thread->rtcluster, NULL, 0, cmds, rctx->read_only, NULL);
 
        REDIS_ASYNC_START_RCODE_PROCESS(ret, thread->rtcluster, thread->cw, inst->coord_pair_reg,
                                        "Failed to enqueue redis PING", XLAT_ACTION_FAIL);
 
        return unlang_xlat_yield(request, redis_remap_xlat_resume, redis_xlat_cancel, FR_SIGNAL_ALLOW(FR_SIGNAL_CANCEL), rctx);
}
 
static xlat_arg_parser_t const redis_node_xlat_args[] = {
        { .required = true, .single = true, .type = FR_TYPE_STRING },
        { .single = true, .type = FR_TYPE_UINT32 },
        XLAT_ARG_PARSER_TERMINATOR
};
 
/** Return the node that is currently servicing a particular key
 *
@verbatim
%redis.node(<key>[, <index>])
@endverbatim
 *
 * @ingroup xlat_functions
 */
static xlat_action_t redis_node_xlat(TALLOC_CTX *ctx, fr_dcursor_t *out,
                                     xlat_ctx_t const *xctx,
                                     request_t *request, fr_value_box_list_t *in)
{
        rlm_redis_thread_t              *thread = talloc_get_type_abort(xctx->mctx->thread, rlm_redis_thread_t);
 
        fr_redis_ct_key_slot_t const    *key_slot;
        fr_redis_ct_node_t const        *node;
        char const                      *ipaddr;
        uint16_t                        port;
 
        unsigned long                   idx = 0;
        fr_value_box_t                  *vb, *key, *idx_vb;
        XLAT_ARGS(in, &key, &idx_vb);
 
        if (idx_vb) idx = idx_vb->vb_uint32;
 
        key_slot = fr_redis_ct_slot_by_key(thread->rtcluster, request, (uint8_t const *)key->vb_strvalue,
                                                key->vb_length);
        if (idx == 0) {
                node = fr_redis_ct_master(thread->rtcluster, key_slot);
        } else if ((idx - 1) > UINT8_MAX) {
                node = NULL;
        } else {
                node = fr_redis_ct_replica(thread->rtcluster, key_slot, (uint8_t) (idx - 1));
        }
 
        if (!node) {
                RDEBUG2("No node available for this key slot");
                return XLAT_ACTION_DONE;
        }
 
        ipaddr = fr_redis_ct_ipaddr(node);
        if (!ipaddr || (fr_redis_ct_port(&port, node) < 0)) {
                REDEBUG("Failed retrieving node information");
                return XLAT_ACTION_FAIL;
        }
 
        MEM(vb = fr_value_box_alloc_null(ctx));
        fr_value_box_asprintf(vb, vb, NULL, false, "%s:%u", ipaddr, port);
        fr_dcursor_append(out, vb);
 
        return XLAT_ACTION_DONE;
}
 
static xlat_arg_parser_t const redis_lua_func_args[] = {
        { .required = true, .single = true, .type = FR_TYPE_UINT64 }, /* key count */
        { .variadic = XLAT_ARG_VARIADIC_EMPTY_KEEP, .concat = true, .type = FR_TYPE_STRING }, /* keys and args */
        XLAT_ARG_PARSER_TERMINATOR
};
 
/** Cancellation of Redis Lua load / exec
 *
 */
static void redis_lua_cancel(xlat_ctx_t const *xctx, request_t *request, UNUSED fr_signal_t action)
{
        rlm_redis_lua_xlat_rctx_t       *rctx = talloc_get_type_abort(xctx->rctx, rlm_redis_lua_xlat_rctx_t);
 
        RDEBUG2("Forcibly cancelling pending redis lua command");
        fr_redis_async_cmd_cancel(rctx->cmd);
}
 
static xlat_action_t redis_lua_func_resume(UNUSED TALLOC_CTX *ctx, fr_dcursor_t *out, xlat_ctx_t const *xctx,
                                           UNUSED request_t *request, UNUSED fr_value_box_list_t *in);
 
/** Process the results of loading a lua script to a redis server
 *
 * If the load succeeds, re-enqueue the original EVALSHA command.
 */
static xlat_action_t redis_lua_load_resume(UNUSED TALLOC_CTX *ctx, UNUSED fr_dcursor_t *out, xlat_ctx_t const *xctx,
                                           request_t *request, UNUSED fr_value_box_list_t *in)
{
        rlm_redis_lua_xlat_rctx_t       *rctx = talloc_get_type_abort(xctx->rctx, rlm_redis_lua_xlat_rctx_t);
 
        if (rctx->action != XLAT_ACTION_DONE) {
                RPERROR("Failed loading lua script");
                return rctx->action;
        }
 
        /*
         *      Now the script has loaded, re-run the EVALSHA command on the same trunk
         */
        fr_redis_command_set_reset(rctx->cmds);
        if (redis_command_set_enqueue(fr_redis_async_cmd_trunk(rctx->cmd), rctx->cmds) != FR_REDIS_PIPELINE_OK) {
                return XLAT_ACTION_FAIL;
        }
 
        return unlang_xlat_yield(request, redis_lua_func_resume, redis_lua_cancel, FR_SIGNAL_ALLOW(FR_SIGNAL_CANCEL), rctx);
}
 
/** Callback to verify reply to SCRIPT LOAD
 */
static void redis_lua_load_results(request_t *request, UNUSED fr_redis_command_t *cmd, redisReply *reply, void *rctx)
{
        rlm_redis_lua_xlat_rctx_t       *xlat_rctx = talloc_get_type_abort(rctx, rlm_redis_lua_xlat_rctx_t);
 
        if (reply->type != REDIS_REPLY_STRING) {
                REDEBUG("Unexpected reply type after loading function");
                return;
        }
 
        if (strcmp(reply->str, xlat_rctx->func->digest) == 0) {
                RDEBUG3("Script \"%s\" loaded", xlat_rctx->func->name);
                xlat_rctx->action = XLAT_ACTION_DONE;
                return;
        }
 
        REDEBUG("Function digest %s, does not match calculated digest %s", reply->str, xlat_rctx->func->digest);
}
 
/** Callback to convert redis reply to value boxes
 */
static void redis_lua_xlat_results(request_t *request, fr_redis_command_t *cmd, redisReply *reply, void *rctx)
{
        rlm_redis_lua_xlat_rctx_t       *xlat_rctx = talloc_get_type_abort(rctx, rlm_redis_lua_xlat_rctx_t);
        fr_value_box_t                  *vb;
 
        MEM(vb = fr_value_box_alloc_null(xlat_rctx->ctx));
        if (fr_redis_reply_to_value_box(xlat_rctx->ctx, vb, reply, FR_TYPE_VOID, NULL, false, false) < 0) {
                RPERROR("Failed processing reply to %s", fr_redis_command_get_cmd(cmd));
                return;
        }
 
        if (vb->type == FR_TYPE_GROUP) {
                fr_value_box_t  *child_vb = NULL;
                while ((child_vb = fr_value_box_list_pop_head(&vb->vb_group))) fr_value_box_list_insert_tail(&xlat_rctx->out, child_vb);
                talloc_free(vb);
        } else {
                fr_value_box_list_insert_tail(&xlat_rctx->out, vb);
        }
        xlat_rctx->action = XLAT_ACTION_DONE;
}
 
/** Process the results from calling a lua script
 *
 * Enqueuing SCRIPT LOAD ... if the server reports that the script is missing
 */
static xlat_action_t redis_lua_func_resume(UNUSED TALLOC_CTX *ctx, fr_dcursor_t *out, xlat_ctx_t const *xctx,
                                           request_t *request, UNUSED fr_value_box_list_t *in)
{
        rlm_redis_lua_xlat_rctx_t       *rctx = talloc_get_type_abort(xctx->rctx, rlm_redis_lua_xlat_rctx_t);
        fr_value_box_t                  *vb = NULL;
 
        switch (fr_redis_command_set_rcode(rctx->cmds)) {
        case REDIS_ASYNC_RCODE_MOVE:
        {
                rlm_redis_t const       *inst = talloc_get_type_abort_const(xctx->mctx->mi->data, rlm_redis_t);
                rlm_redis_thread_t      *thread = talloc_get_type_abort(xctx->mctx->thread, rlm_redis_thread_t);
 
                if (inst->conf.use_cluster_map) fr_redis_ct_map_get(thread->rtcluster, thread->cw,
                                                                    inst->coord_pair_reg, false);
        }
                FALL_THROUGH;
 
        case REDIS_ASYNC_RCODE_ASK:
                if (fr_redis_async_cmd_redirect(rctx->cmd) != REDIS_ASYNC_RCODE_SUCCESS) return XLAT_ACTION_FAIL;
                return unlang_xlat_yield(request, redis_lua_func_resume, redis_lua_cancel, FR_SIGNAL_ALLOW(FR_SIGNAL_CANCEL), rctx);
 
        case REDIS_ASYNC_RCODE_TRY_AGAIN:
                if (fr_redis_async_cmd_resend(rctx->cmd) != REDIS_ASYNC_RCODE_SUCCESS) return XLAT_ACTION_FAIL;
                return unlang_xlat_yield(request, redis_lua_func_resume, redis_lua_cancel, FR_SIGNAL_ALLOW(FR_SIGNAL_CANCEL), rctx);
 
        case REDIS_ASYNC_RCODE_ERROR:
                PERROR("Server returned error");
                return XLAT_ACTION_FAIL;
 
        case REDIS_ASYNC_RCODE_NO_SCRIPT:
        {
                fr_redis_command_set_t  *cmds;
                char const              **argv;
                size_t                  *argv_len;
 
                RWARN("Script \"%s\" not on the server", rctx->func->name);
 
                MEM(cmds = fr_redis_command_set_alloc(rctx, request, NULL, NULL, NULL, false));
                MEM(argv = talloc_array(cmds, char const *, 3));
                MEM(argv_len = talloc_array(cmds, size_t, 3));
 
                argv[0] = "SCRIPT";
                argv_len[0] = sizeof("SCRIPT") - 1;
                argv[1] = "LOAD";
                argv_len[1] = sizeof("LOAD") - 1;
                argv[2] = rctx->func->body;
                argv_len[2] = talloc_strlen(rctx->func->body);
 
                REDIS_XLAT_CMD_SETUP(cmds, 3, argv, argv_len, rctx, false, redis_lua_load_results);
 
                if (redis_command_set_enqueue(fr_redis_async_cmd_trunk(rctx->cmd), cmds) != FR_REDIS_PIPELINE_OK) {
                        return XLAT_ACTION_FAIL;
                }
 
                return unlang_xlat_yield(request, redis_lua_load_resume, redis_lua_cancel, FR_SIGNAL_ALLOW(FR_SIGNAL_CANCEL), rctx);
        }
        default:
                break;
        }
        if (rctx->action != XLAT_ACTION_DONE) {
                RPERROR("Failed executing lua script");
                return rctx->action;
        }
        while ((vb = fr_value_box_list_pop_head(&rctx->out))) fr_dcursor_append(out, vb);
 
        return XLAT_ACTION_DONE;
}
 
/** Call a lua function on the redis server
 *
 * Lua functions either get uploaded when the trunk connection becomes active or the first
 * time they get executed.
 */
static xlat_action_t redis_lua_func_xlat(TALLOC_CTX *ctx, UNUSED fr_dcursor_t *out,
                                         xlat_ctx_t const *xctx,
                                         request_t *request, fr_value_box_list_t *in)
{
        rlm_redis_t                     *inst = talloc_get_type_abort(xctx->mctx->mi->data, rlm_redis_t);
        rlm_redis_thread_t              *thread = talloc_get_type_abort(xctx->mctx->thread, rlm_redis_thread_t);
        redis_lua_func_inst_t const     *xlat_inst = talloc_get_type_abort_const(xctx->inst, redis_lua_func_inst_t);
        redis_lua_func_t                *func = xlat_inst->func;
 
        fr_redis_command_set_t          *cmds;
        rlm_redis_lua_xlat_rctx_t       *rctx;
        fr_redis_async_rcode_t          ret;
 
        char const                      **argv;
        size_t                          *arg_len;
        size_t                          argc;
        fr_value_box_t                  *key_vb;
        char                            *key_count;
        uint8_t const                   *key = NULL;
        size_t                          key_len = 0;
 
        argc = fr_value_box_list_num_elements(in);
        if (argc > MAX_REDIS_ARGS) {
                REDEBUG("Too many arguments (%zu)", argc);
                return XLAT_ACTION_FAIL;
        }
        argc += 2;
 
        MEM(rctx = talloc_zero(unlang_interpret_frame_talloc_ctx(request), rlm_redis_lua_xlat_rctx_t));
        rctx->ctx = ctx;
        rctx->action = XLAT_ACTION_FAIL;
        rctx->func = func;
        fr_value_box_list_init(&rctx->out);
 
        MEM(cmds = fr_redis_command_set_alloc(rctx, request, NULL, NULL, NULL, false));
        rctx->cmds = cmds;
 
        MEM(argv = talloc_array(cmds, char const *, argc));
        MEM(arg_len  = talloc_array(cmds, size_t, argc));
 
        /*
         *      Try EVALSHA first, and if that fails fall back to SCRIPT LOAD
         */
        argv[0] = talloc_strdup(argv, "EVALSHA");
        arg_len[0] = sizeof("EVALSHA") - 1;
        argv[1] = func->digest;
        arg_len[1] = sizeof(func->digest) - 1;
 
        /*
         *      First argument is always the key count
         */
        key_vb = fr_value_box_list_pop_head(in);
        fr_assert(key_vb);
        arg_len[2] = fr_value_box_aprint(argv, &key_count, key_vb, NULL);
        if (unlikely(!key_count)) {
                RPERROR("Failed converting key count to string");
                return XLAT_ACTION_FAIL;
        }
        argv[2] = key_count;
 
        argc = 3;
        fr_value_box_list_foreach(in, vb) {
                /*
                 *      Fixup null or empty arguments to be
                 *      zero length strings so that the position
                 *      of subsequent arguments are maintained.
                 */
                if (!fr_type_is_string(vb->type)) {
                        argv[argc] = "";
                        arg_len[argc++] = 0;
                        continue;
                }
 
                argv[argc] = talloc_strdup(argv, vb->vb_strvalue);
                arg_len[argc++] = vb->vb_length;
        }
 
        /*
         *      For eval commands all keys should hash to the same redis instance
         *      so we just use the first key (the arg after the key count).
         */
        if (argc > 3) {
                key = (uint8_t const *)argv[3];
                key_len = arg_len[3];
        }
 
        REDIS_XLAT_CMD_SETUP(cmds, argc, argv, arg_len, rctx, func->read_only, redis_lua_xlat_results);
 
        rctx->cmd = fr_redis_async_cmd_start(rctx, request, &ret, thread->rtcluster, key, key_len,
                                             cmds, func->read_only, NULL);
 
        REDIS_ASYNC_START_RCODE_PROCESS(ret, thread->rtcluster, thread->cw, inst->coord_pair_reg,
                                        "Failed enqueing lua command", XLAT_ACTION_FAIL);
 
        return unlang_xlat_yield(request, redis_lua_func_resume, redis_lua_cancel, FR_SIGNAL_ALLOW(FR_SIGNAL_CANCEL), rctx);
}
 
/** Copies the function configuration into xlat function instance data
 *
 */
static int redis_lua_func_instantiate(xlat_inst_ctx_t const *xctx)
{
        redis_lua_func_inst_t *inst = talloc_get_type_abort(xctx->inst, redis_lua_func_inst_t);
 
        inst->func = talloc_get_type_abort(xctx->uctx, redis_lua_func_t);
 
        return 0;
}
 
static xlat_arg_parser_t const redis_args[] = {
        { .required = true, .concat = true, .type = FR_TYPE_STRING },
        { .variadic = XLAT_ARG_VARIADIC_EMPTY_KEEP, .concat = true, .type = FR_TYPE_STRING },
        XLAT_ARG_PARSER_TERMINATOR
};
 
/** Callback to convert redis reply to value boxes
 */
static void redis_xlat_results(request_t *request, fr_redis_command_t *cmd, redisReply *reply, void *rctx)
{
        rlm_redis_xlat_rctx_t   *xlat_rctx = talloc_get_type_abort(rctx, rlm_redis_xlat_rctx_t);
        fr_value_box_t          *vb;
 
        MEM(vb = fr_value_box_alloc_null(xlat_rctx->ctx));
        if (fr_redis_reply_to_value_box(xlat_rctx->ctx, vb, reply, FR_TYPE_VOID, NULL, false, false) < 0) {
                RPERROR("Failed processing reply to %s", fr_redis_command_get_cmd(cmd));
                return;
        }
 
        if (vb->type == FR_TYPE_GROUP) {
                fr_value_box_t  *child_vb = NULL;
                while ((child_vb = fr_value_box_list_pop_head(&vb->vb_group))) fr_value_box_list_insert_tail(&xlat_rctx->out, child_vb);
                talloc_free(vb);
        } else {
                fr_value_box_list_insert_tail(&xlat_rctx->out, vb);
        }
        xlat_rctx->action = XLAT_ACTION_DONE;
}
 
static xlat_action_t redis_xlat_resume(UNUSED TALLOC_CTX *ctx, fr_dcursor_t *out, xlat_ctx_t const *xctx,
                                       request_t *request, UNUSED fr_value_box_list_t *in)
{
        rlm_redis_xlat_rctx_t   *rctx = talloc_get_type_abort(xctx->rctx, rlm_redis_xlat_rctx_t);
        fr_value_box_t          *vb = NULL;
 
        switch (fr_redis_command_set_rcode(rctx->cmds)) {
        case REDIS_ASYNC_RCODE_MOVE:
        {
                rlm_redis_t const       *inst = talloc_get_type_abort_const(xctx->mctx->mi->data, rlm_redis_t);
                rlm_redis_thread_t      *thread = talloc_get_type_abort(xctx->mctx->thread, rlm_redis_thread_t);
 
                if (inst->conf.use_cluster_map) fr_redis_ct_map_get(thread->rtcluster, thread->cw,
                                                                    inst->coord_pair_reg, false);
        }
                FALL_THROUGH;
 
        case REDIS_ASYNC_RCODE_ASK:
                if (rctx->forced_node) goto error;
                if (fr_redis_async_cmd_redirect(rctx->cmd) != REDIS_ASYNC_RCODE_SUCCESS) return XLAT_ACTION_FAIL;
                return unlang_xlat_yield(request, redis_xlat_resume, redis_xlat_cancel, FR_SIGNAL_ALLOW(FR_SIGNAL_CANCEL), rctx);
 
        case REDIS_ASYNC_RCODE_TRY_AGAIN:
                if (fr_redis_async_cmd_resend(rctx->cmd) != REDIS_ASYNC_RCODE_SUCCESS) return XLAT_ACTION_FAIL;
                return unlang_xlat_yield(request, redis_xlat_resume, redis_xlat_cancel, FR_SIGNAL_ALLOW(FR_SIGNAL_CANCEL), rctx);
 
        case REDIS_ASYNC_RCODE_ERROR:
        error:
                RPERROR("Server returned error");
                return XLAT_ACTION_FAIL;
 
        default:
                break;
        }
 
        if (rctx->action != XLAT_ACTION_DONE) {
                RPERROR("Failed executing Redis command");
                return rctx->action;
        }
 
        while ((vb = fr_value_box_list_pop_head(&rctx->out))) fr_dcursor_append(out, vb);
 
        return XLAT_ACTION_DONE;
}
 
/** Xlat to make calls to redis
 *
@verbatim
%redis(<redis command>)
@endverbatim
 *
 * @ingroup xlat_functions
 */
static xlat_action_t redis_xlat(TALLOC_CTX *ctx, UNUSED fr_dcursor_t *out,
                                xlat_ctx_t const *xctx,
                                request_t *request, fr_value_box_list_t *in)
{
        rlm_redis_t const       *inst = talloc_get_type_abort_const(xctx->mctx->mi->data, rlm_redis_t);
        rlm_redis_thread_t      *thread = talloc_get_type_abort(xctx->mctx->thread, rlm_redis_thread_t);
        uint8_t const           *key = NULL;
        size_t                  key_len = 0;
 
        fr_value_box_t          *first = fr_value_box_list_head(in);
        fr_sbuff_t              sbuff = FR_SBUFF_IN(first->vb_strvalue, first->vb_length);
 
        int                     argc = 0;
        char const              **argv;
        size_t                  *arg_len;
        fr_redis_command_set_t  *cmds;
        rlm_redis_xlat_rctx_t   *rctx;
        fr_redis_async_rcode_t  ret;
        fr_redis_ct_node_t      *node = NULL;
 
        MEM(rctx = talloc_zero(unlang_interpret_frame_talloc_ctx(request), rlm_redis_xlat_rctx_t));
        rctx->ctx = ctx;
        rctx->action = XLAT_ACTION_FAIL;
        fr_value_box_list_init(&rctx->out);
 
        if (fr_sbuff_next_if_char(&sbuff, '-')) rctx->read_only = true;
 
        /*
         *      Hack to allow querying against a specific node for testing
         */
        if (fr_sbuff_next_if_char(&sbuff, '@')) {
                fr_ipaddr_t     node_addr;
                uint16_t        port;
                char            buff[FR_IPADDR_STRLEN];
 
                RDEBUG3("Overriding node selection");
 
                if (fr_inet_pton_port(&node_addr, &port,
                                      fr_sbuff_current(&sbuff), fr_sbuff_remaining(&sbuff),
                                      AF_UNSPEC, true, true) < 0) {
                        RPEDEBUG("Failed parsing node address");
                        return XLAT_ACTION_FAIL;
                }
 
                fr_inet_ntop(buff, sizeof(buff), &node_addr);
                node = fr_redis_ct_node_by_addr(thread->rtcluster, &(fr_redis_io_conf_t){
                                .hostname = buff,
                                .port = port
                        });
                if (!node) {
                        RPEDEBUG("Failed locating cluster node");
                        return XLAT_ACTION_FAIL;
                }
 
                fr_value_box_list_talloc_free_head(in); /* Remove and free server arg */
                rctx->forced_node = true;
        }
 
        MEM(cmds = fr_redis_command_set_alloc(rctx, request, NULL, NULL, NULL, false));
        rctx->cmds = cmds;
 
        argc = fr_value_box_list_num_elements(in);
        MEM(argv = talloc_array(cmds, char const *, argc));
        MEM(arg_len = talloc_array(cmds, size_t, argc));
 
        argc = 0;
        fr_value_box_list_foreach(in, vb) {
                if (!fr_type_is_string(vb->type)) {
                        argv[argc] = talloc_strdup(argv, "");
                        arg_len[argc++] = 0;
                        continue;
                }
 
                if ((argc == 0) && rctx->read_only && !rctx->forced_node) {
                        argv[argc] = talloc_strndup(argv, vb->vb_strvalue + 1, vb->vb_length - 1);
                        arg_len[argc] = vb->vb_length - 1;
                } else {
                        argv[argc] = talloc_strndup(argv, vb->vb_strvalue, vb->vb_length);
                        arg_len[argc] = vb->vb_length;
                }
                argc++;
        }
 
        /*
         *      If we've got multiple arguments, the second one is usually the key.
         *      The Redis docs say commands should be analysed first to get key
         *      positions, but this involves sending them to the server, which is
         *      just as expensive as sending them to the wrong server and receiving
         *      a redirect.
         */
        if (argc > 1) {
                key = (uint8_t const *)argv[1];
                key_len = arg_len[1];
        }
 
        REDIS_XLAT_CMD_SETUP(cmds, argc, argv, arg_len, rctx, rctx->read_only, redis_xlat_results);
 
        rctx->cmd = fr_redis_async_cmd_start(unlang_interpret_frame_talloc_ctx(request), request, &ret,
                                             thread->rtcluster, key, key_len, cmds, rctx->read_only, node);
 
        REDIS_ASYNC_START_RCODE_PROCESS(ret, thread->rtcluster, thread->cw, inst->coord_pair_reg,
                                        "Failed enqueueing Redis command", XLAT_ACTION_FAIL);
 
        return unlang_xlat_yield(request, redis_xlat_resume, redis_xlat_cancel, FR_SIGNAL_ALLOW(FR_SIGNAL_CANCEL), rctx);
}
 
static void lua_script_load_results(UNUSED request_t *request, UNUSED fr_redis_command_t *cmd,
                                    UNUSED redisReply *reply, void *rctx)
{
        redis_lua_func_t        *func = talloc_get_type_abort(rctx, redis_lua_func_t);
        DEBUG2("Loaded lua function \"%s\" onto node", func->name);
}
 
static void lua_script_load(fr_redis_trunk_t *rtrunk, void *uctx)
{
        rlm_redis_thread_t      *thread = talloc_get_type_abort(uctx, rlm_redis_thread_t);
        fr_redis_command_set_t  *cmds;
 
        MEM(cmds = fr_redis_command_set_alloc(rtrunk, NULL, NULL, NULL, NULL, true));
 
        talloc_foreach(thread->inst->lua.funcs, func) {
                char const      **argv;
                size_t          *argv_len;
 
                MEM(argv = talloc_array(cmds, char const *, 3));
                MEM(argv_len = talloc_array(cmds, size_t, 3));
 
                argv[0] = "SCRIPT";
                argv_len[0] = sizeof("SCRIPT") - 1;
                argv[1] = "LOAD";
                argv_len[1] = sizeof("LOAD") - 1;
                argv[2] = func->body;
                argv_len[2] = talloc_strlen(func->body);
 
                if (fr_redis_command_argv_add(cmds, 3, argv, argv_len,
                                              lua_script_load_results, func) != FR_REDIS_PIPELINE_OK) {
                        talloc_free(cmds);
                        return;
                }
        }
 
        if (redis_command_set_enqueue(rtrunk, cmds) != FR_REDIS_PIPELINE_OK) {
                ERROR("Failed to enqueue lua function loading");
                talloc_free(cmds);
        }
}
 
 
static int mod_thread_instantiate(module_thread_inst_ctx_t const *mctx)
{
        rlm_redis_thread_t      *t = talloc_get_type_abort(mctx->thread, rlm_redis_thread_t);
        rlm_redis_t             *inst = talloc_get_type_abort(mctx->mi->data, rlm_redis_t);
 
        if (talloc_array_length(inst->lua.funcs) == 0) {
                t->rtcluster = fr_redis_ct_alloc(t, mctx->el, &inst->conf, NULL, NULL, false);
        } else {
                t->rtcluster = fr_redis_ct_alloc(t, mctx->el, &inst->conf, lua_script_load, t, true);
        }
        if (!t->rtcluster) return -1;
        t->inst = inst;
 
        return 0;
}
 
static int mod_coord_attach(module_thread_inst_ctx_t const *mctx)
{
        rlm_redis_thread_t      *t = talloc_get_type_abort(mctx->thread, rlm_redis_thread_t);
        rlm_redis_t             *inst = talloc_get_type_abort(mctx->mi->data, rlm_redis_t);
 
        if (!inst->conf.use_cluster_map) return 0;
 
        t->cw = fr_coord_attach(t, mctx->el, inst->coord_reg);
 
        if (!t->cw) {
                ERROR("Failed to attach to coordinator");
                return -1;
        }
 
        if ((inst->conf.trunk_conf.start == 0) || (fr_schedule_worker_id() != 0)) return 0;
 
        return fr_redis_ct_map_bootstrap(t->rtcluster, t->cw, inst->coord_pair_reg);
}
 
REDIS_ASYNC_COORD_CALLBACKS(rlm_redis_thread_t);
 
static int mod_instantiate(module_inst_ctx_t const *mctx)
{
        rlm_redis_t *inst = talloc_get_type_abort(mctx->mi->data, rlm_redis_t);
 
        inst->conf.log_prefix = mctx->mi->name;
        inst->conf.module_name = mctx->mi->module->name;
        inst->conf.inst_name = mctx->mi->name;
 
#ifdef HAVE_REDIS_SSL
        if (inst->conf.use_tls && !inst->conf.tls) {
                cf_log_err(mctx->mi->conf, "Missing tls section");
                return -1;
        }
#endif
 
        if (!inst->conf.use_cluster_map) return 0;
 
        if (inst->conf.database) {
                cf_log_err(mctx->mi->conf, "Cannot set Redis database number when cluster in use");
                return -1;
        }
 
        inst->coord_pair_reg = fr_coord_pair_register(&(fr_coord_pair_reg_ctx_t) {
                        .name = mctx->mi->name,
                        .worker_cb = worker_pair_callbacks,
                        .cb_id = REDIS_COORD_PAIR_CALLBACK_ID,
                        .root = fr_dict_root(dict_redis),
                        .cs = mctx->mi->conf,
                }
        );
        if (!inst->coord_pair_reg) return -1;
 
        FR_COORD_PAIR_CB_CTX_SET(coord_callbacks, worker_callbacks, inst->coord_pair_reg);
 
        inst->coord_reg = fr_coord_register(&(fr_coord_reg_ctx_t) {
                        .name = mctx->mi->name,
                        .coord_cb = coord_callbacks,
                        .worker_cb = worker_callbacks,
                        .mi = mctx->mi
                });
 
        if (!inst->coord_reg) return -1;
 
        return 0;
}
 
static int mod_coord_detach(module_thread_inst_ctx_t const *mctx)
{
        rlm_redis_thread_t      *t = talloc_get_type_abort(mctx->thread, rlm_redis_thread_t);
 
        if (!t->cw) return 0;
 
        fr_coord_detach(t->cw, true);
        t->cw = NULL;
        return 0;
}
 
static int mod_detach(module_detach_ctx_t const *mctx)
{
        rlm_redis_t     *inst = talloc_get_type_abort(mctx->mi->data, rlm_redis_t);
 
        if (!inst->conf.use_cluster_map) return 0;
 
        fr_coord_deregister(inst->coord_reg);
        talloc_free(inst->coord_pair_reg);
        return 0;
}
 
static int mod_bootstrap(module_inst_ctx_t const *mctx)
{
        rlm_redis_t const       *inst = talloc_get_type_abort(mctx->mi->data, rlm_redis_t);
        xlat_t                  *xlat;
 
        xlat = module_rlm_xlat_register(mctx->mi->boot, mctx, NULL, redis_xlat, FR_TYPE_VOID);
        xlat_func_args_set(xlat, redis_args);
        xlat_func_flags_set(xlat, XLAT_FUNC_FLAG_MODULE_STATUS);
 
        /*
         *      %redis.node(<key>[, idx])
         */
        if (unlikely((xlat = module_rlm_xlat_register(mctx->mi->boot, mctx, "node", redis_node_xlat, FR_TYPE_STRING)) == NULL)) return -1;
        xlat_func_args_set(xlat, redis_node_xlat_args);
 
        if (unlikely((xlat = module_rlm_xlat_register(mctx->mi->boot, mctx, "remap", redis_remap_xlat, FR_TYPE_STRING)) == NULL)) return -1;
 
        /*
         *      Loop over the lua functions, registering an xlat
         *      that'll call that function specifically.
         */
        talloc_foreach(inst->lua.funcs, func) {
                if (unlikely((xlat = module_rlm_xlat_register(mctx->mi->boot, mctx, func->name, redis_lua_func_xlat, FR_TYPE_VOID)) == NULL)) return -1;
                xlat_func_args_set(xlat, redis_lua_func_args);
                xlat_func_instantiate_set(xlat, redis_lua_func_instantiate, redis_lua_func_inst_t, NULL, func);
                xlat_func_flags_set(xlat, XLAT_FUNC_FLAG_MODULE_STATUS);
        }
 
        return 0;
}
 
static int mod_load(void)
{
        fr_redis_version_print();
 
        return redis_dict_init();
}
 
extern module_rlm_t rlm_redis;
module_rlm_t rlm_redis = {
        .common = {
                .magic          = MODULE_MAGIC_INIT,
                .name           = "redis",
                .inst_size      = sizeof(rlm_redis_t),
                .config         = module_config,
                .onload         = mod_load,
                .bootstrap      = mod_bootstrap,
                .instantiate    = mod_instantiate,
                .coord_attach   = mod_coord_attach,
                .coord_detach   = mod_coord_detach,
                .detach         = mod_detach,
                MODULE_THREAD_INST(rlm_redis_thread_t),
                .thread_instantiate     = mod_thread_instantiate,
        }
};