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#pragma once
/*
* Authored by Alex Hultman, 2018-2020.
* Intellectual property of third-party.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef UWS_LOOP_H
#define UWS_LOOP_H
/* The loop is lazily created per-thread and run with run() */
#include "LoopData.h"
#include <libusockets.h>
#include <iostream>
namespace uWS {
struct Loop {
private:
static void wakeupCb(us_loop_t *loop) {
LoopData *loopData = (LoopData *) us_loop_ext(loop);
/* Swap current deferQueue */
loopData->deferMutex.lock();
int oldDeferQueue = loopData->currentDeferQueue;
loopData->currentDeferQueue = (loopData->currentDeferQueue + 1) % 2;
loopData->deferMutex.unlock();
/* Drain the queue */
for (auto &x : loopData->deferQueues[oldDeferQueue]) {
x();
}
loopData->deferQueues[oldDeferQueue].clear();
}
static void preCb(us_loop_t *loop) {
LoopData *loopData = (LoopData *) us_loop_ext(loop);
for (auto &p : loopData->preHandlers) {
p.second((Loop *) loop);
}
}
static void postCb(us_loop_t *loop) {
LoopData *loopData = (LoopData *) us_loop_ext(loop);
for (auto &p : loopData->postHandlers) {
p.second((Loop *) loop);
}
}
Loop() = delete;
~Loop() = default;
Loop *init() {
new (us_loop_ext((us_loop_t *) this)) LoopData;
return this;
}
static Loop *create(void *hint) {
Loop *loop = ((Loop *) us_create_loop(hint, wakeupCb, preCb, postCb, sizeof(LoopData)))->init();
/* We also need some timers (should live off the one 4 second timer rather) */
LoopData *loopData = (LoopData *) us_loop_ext((struct us_loop_t *) loop);
loopData->dateTimer = us_create_timer((struct us_loop_t *) loop, 1, sizeof(LoopData *));
loopData->updateDate();
memcpy(us_timer_ext(loopData->dateTimer), &loopData, sizeof(LoopData *));
us_timer_set(loopData->dateTimer, [](struct us_timer_t *t) {
LoopData *loopData;
memcpy(&loopData, us_timer_ext(t), sizeof(LoopData *));
loopData->updateDate();
}, 1000, 1000);
return loop;
}
/* What to do with loops created with existingNativeLoop? */
struct LoopCleaner {
~LoopCleaner() {
if(loop && cleanMe) {
loop->free();
}
}
Loop *loop = nullptr;
bool cleanMe = false;
};
static LoopCleaner &getLazyLoop() {
static thread_local LoopCleaner lazyLoop;
return lazyLoop;
}
public:
/* Lazily initializes a per-thread loop and returns it.
* Will automatically free all initialized loops at exit. */
static Loop *get(void *existingNativeLoop = nullptr) {
if (!getLazyLoop().loop) {
/* If we are given a native loop pointer we pass that to uSockets and let it deal with it */
if (existingNativeLoop) {
/* Todo: here we want to pass the pointer, not a boolean */
getLazyLoop().loop = create(existingNativeLoop);
/* We cannot register automatic free here, must be manually done */
} else {
getLazyLoop().loop = create(nullptr);
getLazyLoop().cleanMe = true;
}
}
return getLazyLoop().loop;
}
/* Freeing the default loop should be done once */
void free() {
LoopData *loopData = (LoopData *) us_loop_ext((us_loop_t *) this);
/* Stop and free dateTimer first */
us_timer_close(loopData->dateTimer, 1);
loopData->~LoopData();
/* uSockets will track whether this loop is owned by us or a borrowed alien loop */
us_loop_free((us_loop_t *) this);
/* Reset lazyLoop */
getLazyLoop().loop = nullptr;
}
void addPostHandler(void *key, MoveOnlyFunction<void(Loop *)> &&handler) {
LoopData *loopData = (LoopData *) us_loop_ext((us_loop_t *) this);
loopData->postHandlers.emplace(key, std::move(handler));
}
/* Bug: what if you remove a handler while iterating them? */
void removePostHandler(void *key) {
LoopData *loopData = (LoopData *) us_loop_ext((us_loop_t *) this);
loopData->postHandlers.erase(key);
}
void addPreHandler(void *key, MoveOnlyFunction<void(Loop *)> &&handler) {
LoopData *loopData = (LoopData *) us_loop_ext((us_loop_t *) this);
loopData->preHandlers.emplace(key, std::move(handler));
}
/* Bug: what if you remove a handler while iterating them? */
void removePreHandler(void *key) {
LoopData *loopData = (LoopData *) us_loop_ext((us_loop_t *) this);
loopData->preHandlers.erase(key);
}
/* Defer this callback on Loop's thread of execution */
void defer(MoveOnlyFunction<void()> &&cb) {
LoopData *loopData = (LoopData *) us_loop_ext((us_loop_t *) this);
//if (std::thread::get_id() == ) // todo: add fast path for same thread id
loopData->deferMutex.lock();
loopData->deferQueues[loopData->currentDeferQueue].emplace_back(std::move(cb));
loopData->deferMutex.unlock();
us_wakeup_loop((us_loop_t *) this);
}
/* Actively block and run this loop */
void run() {
us_loop_run((us_loop_t *) this);
}
/* Passively integrate with the underlying default loop */
/* Used to seamlessly integrate with third parties such as Node.js */
void integrate() {
us_loop_integrate((us_loop_t *) this);
}
/* Dynamically change this */
void setSilent(bool silent) {
((LoopData *) us_loop_ext((us_loop_t *) this))->noMark = silent;
}
};
/* Can be called from any thread to run the thread local loop */
inline void run() {
Loop::get()->run();
}
}
#endif // UWS_LOOP_H
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