eco2d/code/apps/server/source/network.c

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#include "zpl.h"
#define ENET_IMPLEMENTATION
#include "enet.h"
#define LIBRG_IMPL
#define LIBRG_CUSTOM_ZPL
#include "librg.h"
#include "system.h"
#include "network.h"
#include "world/world.h"
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#include "modules/general.h"
#include "modules/controllers.h"
#include "modules/net.h"
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#include "assets.h"
#define NETWORK_UPDATE_DELAY 0.100
#define NETWORK_MAX_CLIENTS 32
static ENetHost *server = NULL;
static zpl_timer nettimer = {0};
int32_t network_init(void) {
zpl_timer_set(&nettimer, NETWORK_UPDATE_DELAY, -1, network_server_update);
return enet_initialize() != 0;
}
int32_t network_destroy(void) {
enet_deinitialize();
return 0;
}
int32_t network_server_start(const char *host, uint16_t port) {
zpl_unused(host);
ENetAddress address = {0};
address.host = ENET_HOST_ANY; /* Bind the server to the default localhost. */
address.port = port; /* Bind the server to port. */
/* create a server */
server = enet_host_create(&address, NETWORK_MAX_CLIENTS, 2, 0, 0);
if (server == NULL) {
zpl_printf("[ERROR] An error occurred while trying to create an ENet server host.\n");
return 1;
}
zpl_printf("[INFO] Started an ENet server...\n");
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zpl_timer_start(&nettimer, NETWORK_UPDATE_DELAY);
return 0;
}
int32_t network_server_stop(void) {
zpl_printf("[INFO] Shutting down the ENet server...\n");
zpl_timer_stop(&nettimer);
enet_host_destroy(server);
server = NULL;
return 0;
}
int32_t network_server_tick(void) {
ENetEvent event = {0};
while (enet_host_service(server, &event, 1) > 0) {
switch (event.type) {
case ENET_EVENT_TYPE_CONNECT: {
zpl_printf("[INFO] A new user %d connected.\n", event.peer->incomingPeerID);
uint16_t peer_id = event.peer->incomingPeerID;
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uint64_t ent_id = network_client_create(event.peer);
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// TODO: Make sure ent_id does not get truncated with large entity numbers.
event.peer->data = (void*)((uint32_t)ent_id);
} break;
case ENET_EVENT_TYPE_DISCONNECT:
case ENET_EVENT_TYPE_DISCONNECT_TIMEOUT: {
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zpl_printf("[INFO] A user %d disconnected.\n", event.peer->incomingPeerID);
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ecs_entity_t e = (ecs_entity_t)((uint32_t)event.peer->data);
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network_client_destroy(e);
} break;
case ENET_EVENT_TYPE_RECEIVE: {
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pkt_header header = {0};
pkt_header_decode(&header, event.packet->data, event.packet->dataLength);
if (header.ok) {
pkt_handlers[header.id].handler(&header);
} else {
// error happened within top level packet flow
}
// /* handle a newly received event */
// librg_world_read(
// world_tracker(),
// event.peer->incomingPeerID,
// (char *)event.packet->data,
// event.packet->dataLength,
// NULL
// );
/* Clean up the packet now that we're done using it. */
enet_packet_destroy(event.packet);
} break;
case ENET_EVENT_TYPE_NONE: break;
}
}
zpl_timer_update(&nettimer);
return 0;
}
void network_server_update(void *data) {
// /* iterate peers and send them updates */
// ENetPeer *currentPeer;
// for (currentPeer = server->peers; currentPeer < &server->peers[server->peerCount]; ++currentPeer) {
// if (currentPeer->state != ENET_PEER_STATE_CONNECTED) {
// continue;
// }
// char buffer[1024] = {0};
// size_t buffer_length = 1024;
// /* serialize peer's the world view to a buffer */
// librg_world_write(
// world_tracker(),
// currentPeer->incomingPeerID,
// buffer,
// &buffer_length,
// NULL
// );
// /* create packet with actual length, and send it */
// ENetPacket *packet = enet_packet_create(buffer, buffer_length, ENET_PACKET_FLAG_RELIABLE);
// enet_peer_send(currentPeer, 0, packet);
// }
}
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uint64_t network_client_create(uint16_t peer_id) {
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ECS_IMPORT(world_ecs(), General);
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ECS_IMPORT(world_ecs(), Controllers);
ECS_IMPORT(world_ecs(), Net);
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ecs_entity_t e = ecs_new(world_ecs(), 0);
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ecs_add(world_ecs(), e, EcsClient);
ecs_set(world_ecs(), e, ClientInfo, {peer_id});
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ecs_set(world_ecs(), e, EcsName, {.alloc_value = zpl_bprintf("client_%d", peer_id) });
librg_entity_track(world_tracker(), e);
librg_entity_owner_set(world_tracker(), e, peer_id);
librg_entity_radius_set(world_tracker(), e, 2); /* 2 chunk radius visibility */
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// librg_entity_chunk_set(world_tracker(), e, 1);
return (uint64_t)e;
}
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void network_client_destroy(uint64_t ent_id) {
librg_entity_untrack(world_tracker(), ent_id);
ecs_delete(world_ecs(), ent_id);
}
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static ENetPeer *network_enet_find_by_id(uint16_t peer_id) {
for (size_t i = 0; i < server->peerCount; ++i) {
ENetPeer *peer = &server->peers[i];
if (enet_peer_get_id(peer) == peer_id)
return peer;
}
return NULL;
}
static int32_t network_msg_send_raw(uint16_t peer_id, void *data, size_t datalen, uint32_t flags) {
ENetPacket *packet = enet_packet_create(data, datalen, flags);
enet_peer_send(network_enet_find_by_id(peer_id), 0, packet);
}
int32_t network_msg_send(uint16_t peer_id, void *data, size_t datalen) {
network_msg_send_raw(peer_id, data, datalen, ENET_PACKET_FLAG_RELIABLE);
}
int32_t network_msg_send_unreliable(uint16_t peer_id, void *data, size_t datalen) {
network_msg_send_raw(peer_id, data, datalen, 0);
}