4d284daefd
Update references of copyright being assigned to Salvatore when it was transferred to Redis Ltd. as per https://github.com/valkey-io/valkey/issues/544. --------- Signed-off-by: Pieter Cailliau <pieter@redis.com>
126 lines
5.4 KiB
C
126 lines
5.4 KiB
C
/* Helloworld cluster -- A ping/pong cluster API example.
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*
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* -----------------------------------------------------------------------------
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*
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* Copyright (c) 2018, Redis Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "../valkeymodule.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <string.h>
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#define MSGTYPE_PING 1
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#define MSGTYPE_PONG 2
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/* HELLOCLUSTER.PINGALL */
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int PingallCommand_ValkeyCommand(ValkeyModuleCtx *ctx, ValkeyModuleString **argv, int argc) {
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VALKEYMODULE_NOT_USED(argv);
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VALKEYMODULE_NOT_USED(argc);
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ValkeyModule_SendClusterMessage(ctx, NULL, MSGTYPE_PING, "Hey", 3);
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return ValkeyModule_ReplyWithSimpleString(ctx, "OK");
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}
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/* HELLOCLUSTER.LIST */
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int ListCommand_ValkeyCommand(ValkeyModuleCtx *ctx, ValkeyModuleString **argv, int argc) {
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VALKEYMODULE_NOT_USED(argv);
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VALKEYMODULE_NOT_USED(argc);
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size_t numnodes;
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char **ids = ValkeyModule_GetClusterNodesList(ctx, &numnodes);
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if (ids == NULL) {
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return ValkeyModule_ReplyWithError(ctx, "Cluster not enabled");
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}
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ValkeyModule_ReplyWithArray(ctx, numnodes);
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for (size_t j = 0; j < numnodes; j++) {
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int port;
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ValkeyModule_GetClusterNodeInfo(ctx, ids[j], NULL, NULL, &port, NULL);
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ValkeyModule_ReplyWithArray(ctx, 2);
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ValkeyModule_ReplyWithStringBuffer(ctx, ids[j], VALKEYMODULE_NODE_ID_LEN);
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ValkeyModule_ReplyWithLongLong(ctx, port);
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}
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ValkeyModule_FreeClusterNodesList(ids);
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return VALKEYMODULE_OK;
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}
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/* Callback for message MSGTYPE_PING */
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void PingReceiver(ValkeyModuleCtx *ctx,
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const char *sender_id,
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uint8_t type,
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const unsigned char *payload,
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uint32_t len) {
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ValkeyModule_Log(ctx, "notice", "PING (type %d) RECEIVED from %.*s: '%.*s'", type, VALKEYMODULE_NODE_ID_LEN,
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sender_id, (int)len, payload);
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ValkeyModule_SendClusterMessage(ctx, NULL, MSGTYPE_PONG, "Ohi!", 4);
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ValkeyModuleCallReply *reply = ValkeyModule_Call(ctx, "INCR", "c", "pings_received");
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ValkeyModule_FreeCallReply(reply);
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}
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/* Callback for message MSGTYPE_PONG. */
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void PongReceiver(ValkeyModuleCtx *ctx,
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const char *sender_id,
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uint8_t type,
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const unsigned char *payload,
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uint32_t len) {
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ValkeyModule_Log(ctx, "notice", "PONG (type %d) RECEIVED from %.*s: '%.*s'", type, VALKEYMODULE_NODE_ID_LEN,
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sender_id, (int)len, payload);
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}
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/* This function must be present on each module. It is used in order to
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* register the commands into the server. */
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int ValkeyModule_OnLoad(ValkeyModuleCtx *ctx, ValkeyModuleString **argv, int argc) {
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VALKEYMODULE_NOT_USED(argv);
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VALKEYMODULE_NOT_USED(argc);
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if (ValkeyModule_Init(ctx, "hellocluster", 1, VALKEYMODULE_APIVER_1) == VALKEYMODULE_ERR) return VALKEYMODULE_ERR;
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if (ValkeyModule_CreateCommand(ctx, "hellocluster.pingall", PingallCommand_ValkeyCommand, "readonly", 0, 0, 0) ==
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VALKEYMODULE_ERR)
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return VALKEYMODULE_ERR;
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if (ValkeyModule_CreateCommand(ctx, "hellocluster.list", ListCommand_ValkeyCommand, "readonly", 0, 0, 0) ==
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VALKEYMODULE_ERR)
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return VALKEYMODULE_ERR;
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/* Disable Cluster sharding and redirections. This way every node
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* will be able to access every possible key, regardless of the hash slot.
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* This way the PING message handler will be able to increment a specific
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* variable. Normally you do that in order for the distributed system
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* you create as a module to have total freedom in the keyspace
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* manipulation. */
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ValkeyModule_SetClusterFlags(ctx, VALKEYMODULE_CLUSTER_FLAG_NO_REDIRECTION);
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/* Register our handlers for different message types. */
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ValkeyModule_RegisterClusterMessageReceiver(ctx, MSGTYPE_PING, PingReceiver);
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ValkeyModule_RegisterClusterMessageReceiver(ctx, MSGTYPE_PONG, PongReceiver);
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return VALKEYMODULE_OK;
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}
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