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152 lines (137 loc) · 5.53 KB
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// The MIT License (MIT)
//
// Copyright (c) 11/27/18 nick. <nbatkins@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.#include "consumer.hpp"
#include <cpp_redis/core/consumer.hpp>
#include <functional>
using std::bind;
using namespace std::placeholders;
namespace cpp_redis {
consumer::client_container::client_container() : ack_client(), poll_client() {}
consumer::consumer(string_t stream, string_t consumer,
size_t max_concurrency)
: m_callbacks(), m_stream(std::move(stream)), m_name(std::move(consumer)),
m_read_id("0"), m_block_sec(-1), m_max_concurrency(max_concurrency),
m_read_count(static_cast<int>(max_concurrency)) {
// Supply the dispatch queue a callback to notify the queue when it is at max
// capacity
m_dispatch_queue = dispatch_queue_ptr_t(new dispatch_queue(
stream, [&](size_t size) { dispatch_changed_handler(size); },
max_concurrency));
m_client = consumer::client_container_ptr_t(new consumer::client_container());
}
consumer_t &consumer::subscribe(
const string_t &group, const consumer_callback_t &consumer_callback,
const acknowledgement_callback_t &acknowledgement_callback) {
m_callbacks.insert({group, {consumer_callback, acknowledgement_callback}});
return *this;
}
void consumer::dispatch_changed_handler(size_t size) {
if (size >= m_max_concurrency) {
dispatch_queue_full.store(true);
dispatch_queue_changed.notify_all();
}
}
void consumer::connect(const string_t &host, size_t port,
const connect_callback_t &connect_callback,
int timeout_ms, int max_reconnects,
int reconnect_interval_ms) {
m_client->ack_client.connect(host, port, connect_callback, timeout_ms,
max_reconnects, reconnect_interval_ms);
m_client->poll_client.connect(host, port, connect_callback, timeout_ms,
max_reconnects, reconnect_interval_ms);
}
void consumer::auth(const string_t &password,
const reply_callback_t &reply_callback) {
m_client->ack_client.auth(password, reply_callback);
m_client->poll_client.auth(password, reply_callback);
}
consumer_t &consumer::commit() {
while (!is_ready) {
if (!is_ready) {
mutex_lock_t dispatch_lock(dispatch_queue_changed_mutex);
dispatch_queue_changed.wait(
dispatch_lock, [&]() { return !dispatch_queue_full.load(); });
m_read_count =
static_cast<int>(m_max_concurrency - m_dispatch_queue->size());
poll();
}
}
return *this;
}
void consumer::dispatch(
const xmessage_t &message,
const pair<string_t, consumer_callback_container_t> &cb) {
m_dispatch_queue->dispatch(message, [&](const message_type &message) {
auto response = cb.second.consumer_callback(message);
// add results to result stream
m_client->ack_client.xadd(m_stream + ":results", CPP_REDIS_WILD_CARD,
response);
// acknowledge task completion
m_client->ack_client
.xack(m_stream, cb.first, {message.get_id()},
[&](const reply_t &r) {
if (r.is_integer()) {
auto ret_int = r.as_integer();
cb.second.acknowledgement_callback(ret_int);
}
})
.sync_commit();
return response;
});
}
void consumer::poll() {
for (auto &cb : m_callbacks) {
m_client->poll_client
.xreadgroup(
{cb.first,
m_name,
{{m_stream}, {m_read_id}},
m_read_count,
m_block_sec,
false},
[&](reply_t &reply) {
// The reply is an array if valid
xstream_reply s_reply(reply);
if (!s_reply.is_null()) {
__CPP_REDIS_LOG(2, "Stream " << s_reply)
for (const auto &stream : s_reply) {
for (auto &m : stream.Messages) {
if (m_should_read_pending.load())
m_read_id = m.get_id();
try {
dispatch(m, cb);
} catch (std::exception &exc) {
__CPP_REDIS_LOG(
1, "Processing failed for message id: " + m.get_id() +
"\nDetails: " + exc.what());
throw exc;
}
}
}
} else {
check_for_pending();
}
return;
})
.sync_commit();
}
}
} // namespace cpp_redis