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62 lines
2.2 KiB
Markdown
62 lines
2.2 KiB
Markdown
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\page caching-messages Caching Messages
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By default D++ does not cache messages. The example program below demonstrates how to instantiate a custom cache using dpp::cache which will allow you to cache messages and query the cache for messages by ID.
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This can be adjusted to cache any type derived from dpp::managed including types you define yourself.
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@note This example will cache and hold onto messages forever! In a real world situation this would be bad. If you do use this,
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you should use the dpp::cache::remove() method periodically to remove stale items. This is left out of this example as a learning
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exercise to the reader. For further reading please see the documentation of dpp::cache
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~~~~~~~~~~{.cpp}
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#include <dpp/dpp.h>
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#include <sstream>
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int main() {
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/* Create bot */
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dpp::cluster bot("token", dpp::i_default_intents | dpp::i_message_content);
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/* Create a cache to contain types of dpp::message */
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dpp::cache<dpp::message> message_cache;
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bot.on_log(dpp::utility::cout_logger());
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/* Message handler */
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bot.on_message_create([&](const dpp::message_create_t &event) {
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/* Make a permanent pointer using new, for each message to be cached */
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dpp::message* m = new dpp::message();
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/* Store the message into the pointer by copying it */
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*m = event.msg;
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/* Store the new pointer to the cache using the store() method */
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message_cache.store(m);
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/* Simple ghetto command handler. In the real world, use slashcommand or commandhandler here. */
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std::stringstream ss(event.msg.content);
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std::string cmd;
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dpp::snowflake msg_id;
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ss >> cmd;
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/* Look for our command */
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if (cmd == "!get") {
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ss >> msg_id;
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/* Search our cache for a cached message */
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dpp::message* find_msg = message_cache.find(msg_id);
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if (find_msg != nullptr) {
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/* Found a cached message, echo it out */
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bot.message_create(dpp::message(event.msg.channel_id, "This message had the following content: " + find_msg->content));
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} else {
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/* Nothing like that here. Have you checked under the carpet? */
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bot.message_create(dpp::message(event.msg.channel_id, "There is no message cached with this ID"));
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}
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}
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});
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/* Start bot */
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bot.start(dpp::st_wait);
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return 0;
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}
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~~~~~~~~~~
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