106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
#include <stdbool.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <strings.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "json.h"
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#include "client.h"
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struct client {
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char id[UUID_LEN];
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int fd;
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struct client *next;
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};
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typedef void (*serializer)(struct packet *, struct buf *);
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struct serializer {
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char *name;
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serializer serialize;
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struct client *client_head;
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} serializers[] = {
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{
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.name = "json",
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.serialize = json_serialize,
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.client_head = NULL,
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},
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};
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#define NUM_SERIALIZERS (sizeof(serializers) / sizeof(*serializers))
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struct serializer *client_get_serializer(char *name) {
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for (int i = 0; i < NUM_SERIALIZERS; i++) {
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if (strcasecmp(serializers[i].name, name) == 0) {
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return &serializers[i];
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}
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}
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return NULL;
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}
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static bool client_hello(int fd, struct serializer *serializer) {
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struct buf buf = BUF_INIT;
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serializer->serialize(NULL, &buf);
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if (buf.length == 0) {
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return true;
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}
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if (write(fd, buf_at(&buf, 0), buf.length) != buf.length) {
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return false;
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}
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return true;
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}
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void client_add(int fd, struct serializer *serializer) {
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int flags = fcntl(fd, F_GETFL, 0);
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assert(flags >= 0);
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flags |= O_NONBLOCK;
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assert(fcntl(fd, F_SETFL, flags) == 0);
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if (!client_hello(fd, serializer)) {
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fprintf(stderr, "C xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx: Failed to write hello to client\n");
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return;
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}
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struct client *client = malloc(sizeof(*client));
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assert(client);
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uuid_gen(client->id);
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client->fd = fd;
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client->next = serializer->client_head;
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serializer->client_head = client;
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fprintf(stderr, "C %s (%s): New client\n", client->id, serializer->name);
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}
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void client_write(struct packet *packet) {
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for (int i = 0; i < NUM_SERIALIZERS; i++) {
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struct serializer *serializer = &serializers[i];
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if (serializer->client_head == NULL) {
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continue;
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}
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struct buf buf = BUF_INIT;
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serializer->serialize(packet, &buf);
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if (buf.length == 0) {
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continue;
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}
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struct client *client = serializer->client_head, *prev_client = NULL;
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while (client) {
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if (write(client->fd, buf_at(&buf, 0), buf.length) == buf.length) {
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prev_client = client;
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client = client->next;
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} else {
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fprintf(stderr, "C %s (%s): Client disconnected\n", client->id, serializer->name);
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if (prev_client) {
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prev_client->next = client->next;
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} else {
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serializer->client_head = client->next;
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}
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struct client *del = client;
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client = client->next;
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free(del);
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}
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}
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}
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}
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