added an id system to the peers

LICENSE.md

@@ -28,7 +28,7 @@ Ce logiciel est distribué tel quel, sans aucune garantie de quelque nature que
 
 ## VI. Glossaire
 
-fork : projet se basant sur le code code source d'un logiciel déjà existant.
+fork : projet se basant sur le code source d'un logiciel déjà existant.
 
 ---
 

source/Context.hpp

@@ -13,6 +13,9 @@ struct Context {
     std::shared_ptr<RemotePeer> server = nullptr;
 
     Peer me;
-    std::map<sockaddr, std::shared_ptr<RemotePeer>> remotePeers {};
+    std::map<
+        std::uint32_t,
+        std::shared_ptr<RemotePeer>
+    > remotePeers {};
     std::chrono::high_resolution_clock::time_point latestPeerDiscovery;
 };

source/EventManager.cpp

@@ -8,6 +8,7 @@
 #include <netdb.h>
 #include <ostream>
 #include <thread>
+#include <random>
 #include <sys/socket.h>
 
 #include "events/types.hpp"
@@ -63,6 +64,19 @@ EventManager::EventManager() {
     ) != 0)
         throw std::runtime_error("[Sender] Could not get the address: " + std::string(gai_strerror(error)));
 
+    // generate a random identifier for ourselves
+    std::random_device randomDevice;
+    std::mt19937 randomGenerator(randomDevice());
+
+    std::uniform_int_distribution<std::uint32_t> distribution(
+        1,
+        std::numeric_limits<std::uint32_t>::max()
+    );
+    this->context.me.id = distribution(randomGenerator);
+
+    // TODO(Faraphel): should only be enabled in specific case.
+    this->context.me.serverEnabled = true;
+
     // define the time of the latest discovery
     this->context.latestPeerDiscovery = std::chrono::high_resolution_clock::now();
 }
@@ -134,7 +148,7 @@ void EventManager::loopReceiver() {
     // TODO(Faraphel): port as argument
     addrinfo* senderInfo;
     if(getaddrinfo(
-        nullptr,  // hostname
+        "0.0.0.0",  // hostname
         "5650",  // port
         &addressHints,
         &senderInfo
@@ -186,7 +200,7 @@ void EventManager::loopReceiver() {
         event->handle(
             this->context,
             packetContent,
-            reinterpret_cast<sockaddr*>(&fromAddress),
+            fromAddress,
             fromAddressLength
         );
     }

source/RemotePeer.hpp

@@ -10,9 +10,11 @@
  * Contains common information about a certain peer.
  */
 struct Peer {
+    std::uint32_t id = 0;
+
     bool serverEnabled = false;
     drp::task::TaskType status = drp::task::TaskType::UNDEFINED;
-    uint8_t channel = 0;
+    std::uint8_t channel = 0;
 
     std::chrono::high_resolution_clock::duration latencyAverage = std::chrono::high_resolution_clock::duration::max();
 };
@@ -23,8 +25,9 @@ struct Peer {
  */
 struct RemotePeer {
     // communication
-    sockaddr address {};
+    sockaddr_storage address {};
     socklen_t addressLength = 0;
+
     std::chrono::high_resolution_clock::duration latency = std::chrono::high_resolution_clock::duration::max();
 
     // information

source/events/audio/AudioEvent.cpp

@@ -32,8 +32,8 @@ AudioEvent::~AudioEvent() {
 void AudioEvent::handle(
     Context& context,
     const packet::GenericPacketContent& content,
-    sockaddr* fromAddress,
+    const sockaddr_storage& fromAddress,
-    socklen_t fromAddressLength
+    const socklen_t fromAddressLength
 ) {
     // get the audio data in the content
     packet::AudioPacketData audioData;

source/events/audio/AudioEvent.hpp

@@ -23,7 +23,7 @@ public:
     void handle(
         Context& context,
         const packet::GenericPacketContent& content,
-        sockaddr* fromAddress,
+        const sockaddr_storage& fromAddress,
         socklen_t fromAddressLength
     ) override;
 

source/events/base/BaseEvent.hpp

@@ -13,7 +13,7 @@ public:
     virtual void handle(
         Context& context,
         const packet::GenericPacketContent& content,
-        sockaddr* fromAddress,
+        const sockaddr_storage& fromAddress,
         socklen_t fromAddressLength
     ) = 0;
 };

source/events/info/InfoEvent.cpp

@@ -10,17 +10,21 @@ namespace drp::event {
 void InfoEvent::handle(
     Context& context,
     const packet::GenericPacketContent& content,
-    sockaddr* fromAddress,
+    const sockaddr_storage& fromAddress,
     const socklen_t fromAddressLength
 ) {
-    // check if the peer address is already in the map
+    // get the peer information
-    std::shared_ptr<RemotePeer> remotePeer;
+    Peer peer;
-    auto iterator = context.remotePeers.find(*fromAddress);
+    std::memcpy(&peer, &content, sizeof(Peer));
 
+    // check if the peer address is already in the map
+    const auto iterator = context.remotePeers.find(peer.id);
+
+    std::shared_ptr<RemotePeer> remotePeer;
     if (iterator == context.remotePeers.end()) {
         // if not found, create a new peer
         remotePeer = std::make_shared<RemotePeer>();
-        remotePeer->address = *fromAddress;
+        remotePeer->address = fromAddress;
         remotePeer->addressLength = fromAddressLength;
         // update the latest discovery time
         context.latestPeerDiscovery = std::chrono::high_resolution_clock::now();
@@ -29,13 +33,11 @@ void InfoEvent::handle(
         remotePeer = iterator->second;
     }
 
-    // save the remote peer information
-    std::memcpy(&remotePeer->information, &content, sizeof(Peer));
-
     // TODO(Faraphel): interpret the timestamp and calculate average ping
 
     // save it in the peers list
-    context.remotePeers[remotePeer->address] = remotePeer;
+    remotePeer->information = peer;
+    context.remotePeers[peer.id] = remotePeer;
 }
 
 

source/events/info/InfoEvent.hpp

@@ -11,7 +11,7 @@ public:
     void handle(
         Context& context,
         const packet::GenericPacketContent& content,
-        sockaddr* fromAddress,
+        const sockaddr_storage& fromAddress,
         socklen_t fromAddressLength
     ) override;
 };

source/events/pong/PongEvent.cpp

@@ -9,8 +9,8 @@ namespace drp::event {
 void PongEvent::handle(
     Context& context,
     const packet::GenericPacketContent& content,
-    sockaddr* fromAddress,
+    const sockaddr_storage& fromAddress,
-    socklen_t fromAddressLength
+    const socklen_t fromAddressLength
 ) {
     std::cout << "[Receiver] Pong." << std::endl;
 }

source/events/pong/PongEvent.hpp

@@ -11,7 +11,7 @@ public:
     void handle(
         Context& context,
         const packet::GenericPacketContent& content,
-        sockaddr* fromAddress,
+        const sockaddr_storage& fromAddress,
         socklen_t fromAddressLength
     ) override;
 };

source/events/search/SearchEvent.cpp

@@ -16,7 +16,7 @@ namespace drp {
 void event::SearchEvent::handle(
     Context& context,
     const packet::GenericPacketContent& content,
-    sockaddr* fromAddress,
+    const sockaddr_storage& fromAddress,
     const socklen_t fromAddressLength
 ) {
     packet::GenericPacket packet {};
@@ -39,7 +39,7 @@ void event::SearchEvent::handle(
         &packet,
         sizeof(packet),
         0,
-        fromAddress,
+        reinterpret_cast<const sockaddr*>(&fromAddress),
         fromAddressLength
     ) == -1) {
         std::cerr << "[Receiver] Could not send information: " << strerror(errno) << std::endl;

source/events/search/SearchEvent.hpp

@@ -10,7 +10,7 @@ public:
     void handle(
         Context& context,
         const packet::GenericPacketContent& content,
-        sockaddr* fromAddress,
+        const sockaddr_storage& fromAddress,
         socklen_t fromAddressLength
     ) override;
 };

source/tasks/undefined/UndefinedTask.cpp

@@ -4,7 +4,10 @@
 #include <chrono>
 #include <cstring>
 #include <iostream>
+#include <numeric>
 #include <thread>
+#include <bits/ranges_util.h>
+#include <pstl/glue_numeric_defs.h>
 #include <sys/socket.h>
 
 #include "../../Context.hpp"
@@ -17,37 +20,13 @@ namespace drp::task {
 
 
 void UndefinedTask::handle(Context& context) {
-    // TODO(Faraphel): If .status is UNDEFINED, look for a server.
+    // search if a server is available among the peer.
-    //  if alone, become a server (if can emit).
-    //  if everyone is UNKNOWN, elect a server (easiest to join / highest mac address, etc...)
-    //  if a server is found, become a client.
-
-    // check if no more peers have been found.
-    if (
-        std::chrono::high_resolution_clock::now() - context.latestPeerDiscovery >
-        std::chrono::milliseconds(5000)
-    ) {
-        // verify if there are peers
-        // TODO(Faraphel): the map is never empty since there is a least the local client
-        if (context.remotePeers.empty()) {
-            // if we are alone in the network
-
-            // check if we are capable of being a server
-            if (!context.me.serverEnabled)
-                return;
-
-            // set ourselves as the server
-            context.server = nullptr;
-            context.me.status = TaskType::SERVER;
-            return;
-        }
-
-        // look for a server among the peers
     const auto& server = std::ranges::find_if(
         context.remotePeers,
         [&](const auto& peer) { return peer.second->information.status == TaskType::SERVER; }
     );
 
+    // if a server have been found, use it
     if (server != context.remotePeers.end()) {
         // if a server have been found, use it
         context.server = server->second;
@@ -55,27 +34,39 @@ void UndefinedTask::handle(Context& context) {
         return;
     }
 
-        // TODO(Faraphel): check if we have the lowest average ping out of all the peers. If yes, become the server.
+    // wait that no more new peers are being discovered
-        //   Others peers will connect to us on their next loop.
+    if (
-        // TODO(Faraphel): use a unique ID instead ?
+        std::chrono::high_resolution_clock::now() - context.latestPeerDiscovery >
-        if (!context.me.serverEnabled)
+        std::chrono::milliseconds(5000)
-            return;
+    ) {
-
+        // otherwise, become the server if we have the highest ID.
-        // check we have the lowest latency out of all the peers
+        // TODO(Faraphel): should use the machine with the lowest average ping
-        if (std::all_of(
+        if (context.me.serverEnabled) {
+            // find the remote peer with the highest id that can be a server
+            const auto serverCandidate = std::max_element(
                 context.remotePeers.begin(),
                 context.remotePeers.end(),
-            [&](const auto& peer) {
+                [&](auto& remotePeer1, auto& remotePeer2) {
-                return peer.second->information.latencyAverage > context.me.latencyAverage;
+                    return (
+                        (remotePeer1.second->information.serverEnabled ? remotePeer1.first : 0) <
+                        (remotePeer2.second->information.serverEnabled ? remotePeer2.first : 0)
+                    );
                 }
-        )) {
+            );
+
+            // check if we are this peer
+            if (context.me.id == serverCandidate->first) {
+                std::cout << "becoming server..." << std::endl;
                 // set ourselves as the server
-            context.server = nullptr;
+                context.server = serverCandidate->second;
                 context.me.status = TaskType::SERVER;
                 return;
             }
         }
 
+        // TODO(Faraphel): sleep 1s
+    }
+
     // prepare a search message
     packet::GenericPacket packet {};
     packet::GenericPacketContent packetContent {};