118 lines
3.1 KiB
C++
118 lines
3.1 KiB
C++
#ifndef MBGL_STORAGE_DEFAULT_HTTP_CONTEXT
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#define MBGL_STORAGE_DEFAULT_HTTP_CONTEXT
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#include <mbgl/storage/network_status.hpp>
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#include <mbgl/util/noncopyable.hpp>
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#include <mbgl/util/std.hpp>
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#include <mbgl/util/util.hpp>
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#include <mbgl/util/uv.hpp>
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#include <uv.h>
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#include <pthread.h>
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#include <map>
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#include <cassert>
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#include <set>
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namespace mbgl {
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class HTTPRequest;
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// This is a template class that provides a per-thread Context object. It can be used by HTTP
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// implementations to store global state. It also implements the NetworkStatus mechanism and
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// triggers immediate retries on all requests waiting for network status changes.
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template <typename Context>
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class HTTPContext : private util::noncopyable {
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protected:
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MBGL_STORE_THREAD(tid)
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using Map = std::map<uv_loop_t *, std::unique_ptr<Context>>;
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public:
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static Context *Get(uv_loop_t *loop);
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private:
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static pthread_key_t key;
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static pthread_once_t once;
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public:
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HTTPContext(uv_loop_t *loop);
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~HTTPContext();
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void addRequest(HTTPRequest *request);
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void removeRequest(HTTPRequest *baton);
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public:
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uv_loop_t *loop;
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// Will be fired when the network status becomes reachable.
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uv_async_t *reachability = nullptr;
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// A list of all pending HTTPRequestImpls that we need to notify when the network status
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// changes.
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std::set<HTTPRequest *> requests;
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};
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template <typename Context>
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Context *HTTPContext<Context>::Get(uv_loop_t *loop) {
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pthread_once(&once, []() {
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pthread_key_create(&key, [](void *ptr) {
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assert(ptr);
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delete reinterpret_cast<Map *>(ptr);
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});
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});
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auto contexts = reinterpret_cast<Map *>(pthread_getspecific(key));
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if (!contexts) {
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contexts = new Map();
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pthread_setspecific(key, contexts);
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}
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// Now find a HTTPContext that matches the requested loop.
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auto it = contexts->find(loop);
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if (it == contexts->end()) {
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auto result = contexts->emplace(loop, util::make_unique<Context>(loop));
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assert(result.second); // Make sure it was actually inserted.
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return result.first->second.get();
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} else {
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return it->second.get();
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}
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}
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template <typename Context>
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HTTPContext<Context>::HTTPContext(uv_loop_t *loop_) : loop(loop_) {
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reachability = new uv_async_t;
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reachability->data = this;
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uv_async_init(loop, reachability, [](uv_async_t *async, int) {
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for (auto request : reinterpret_cast<Context *>(async->data)->requests) {
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request->retryImmediately();
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}
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});
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// Allow the loop to quit even though this handle is still active.
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uv_unref(reinterpret_cast<uv_handle_t *>(reachability));
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NetworkStatus::Subscribe(reachability);
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}
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template <typename Context>
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HTTPContext<Context>::~HTTPContext() {
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MBGL_VERIFY_THREAD(tid);
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assert(requests.empty());
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NetworkStatus::Unsubscribe(reachability);
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uv::close(reachability);
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}
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template <typename Context>
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void HTTPContext<Context>::addRequest(HTTPRequest *request) {
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requests.insert(request);
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}
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template <typename Context>
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void HTTPContext<Context>::removeRequest(HTTPRequest *request) {
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requests.erase(request);
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}
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}
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#endif
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