#include <stdint.h>
#include <assert.h>
#include <arpa/inet.h>
-#include <curl/curl.h>
#include <sys/socket.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/ioctl.h>
-#include <sys/epoll.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <poll.h>
#include <errno.h>
#include <vector>
#include <string>
#include "input.h"
#include "server.h"
#include "serverpool.h"
+#include "parse.h"
using namespace std;
extern ServerPool *servers;
Input::Input(const string &stream_id, const string &url)
- : stream_id(stream_id),
+ : state(NOT_CONNECTED),
+ stream_id(stream_id),
url(url),
- has_metacube_header(false)
+ // TODO
+ host("gruessi.zrh.sesse.net"),
+ port("4013"),
+ path("/test.flv"),
+ has_metacube_header(false),
+ sock(-1)
{
}
return NULL;
}
-void Input::do_work()
+int Input::lookup_and_connect(const string &host, const string &port)
{
- CURL *curl = curl_easy_init();
+ addrinfo *ai;
+ int err = getaddrinfo(host.c_str(), port.c_str(), NULL, &ai);
+ if (err == -1) {
+ fprintf(stderr, "WARNING: Lookup of '%s' failed (%s).\n",
+ host.c_str(), gai_strerror(err));
+ freeaddrinfo(ai);
+ return -1;
+ }
- while (!should_stop) {
- curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &Input::curl_callback_thunk);
- curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
- curl_easy_perform(curl);
- if (!should_stop) {
- printf("Transfer of '%s' ended, waiting 0.2 seconds and restarting...\n", url.c_str());
- usleep(200000);
+ // Connect to everything in turn until we have a socket.
+ while (ai && !should_stop) {
+ int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
+ if (sock == -1) {
+ // Could be e.g. EPROTONOSUPPORT. The show must go on.
+ continue;
+ }
+
+ do {
+ err = connect(sock, ai->ai_addr, ai->ai_addrlen);
+ } while (err == -1 && errno == EINTR);
+
+ if (err != -1) {
+ freeaddrinfo(ai);
+ return sock;
}
+
+ ai = ai->ai_next;
}
+
+ // Give the last one as error.
+ fprintf(stderr, "WARNING: Connect to '%s' failed (%s)\n",
+ host.c_str(), strerror(errno));
+ freeaddrinfo(ai);
+ return -1;
}
-size_t Input::curl_callback_thunk(char *ptr, size_t size, size_t nmemb, void *userdata)
+void Input::do_work()
{
- Input *input = static_cast<Input *>(userdata);
- if (input->should_stop) {
- return 0;
- }
+ while (!should_stop) {
+ if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
+ // Since we are non-blocking, we need to wait for the right state first.
+ // Wait up to 50 ms, then check should_stop.
+ pollfd pfd;
+ pfd.fd = sock;
+ pfd.events = (state == SENDING_REQUEST) ? POLLOUT : POLLIN;
+ pfd.events |= POLLRDHUP;
- size_t bytes = size * nmemb;
- input->curl_callback(ptr, bytes);
- return bytes;
-}
+ int nfds = poll(&pfd, 1, 50);
+ if (nfds == 0 || (nfds == -1 && errno == EAGAIN)) {
+ continue;
+ }
+ if (nfds == -1) {
+ perror("poll");
+ state = CLOSING_SOCKET;
+ }
+ }
+
+ switch (state) {
+ case NOT_CONNECTED:
+ request.clear();
+ request_bytes_sent = 0;
+ response.clear();
+
+ sock = lookup_and_connect(host, port);
+ if (sock != -1) {
+ // Yay, successful connect. Try to set it as nonblocking.
+ int one = 1;
+ if (ioctl(sock, FIONBIO, &one) == -1) {
+ perror("ioctl(FIONBIO)");
+ state = CLOSING_SOCKET;
+ } else {
+ state = SENDING_REQUEST;
+ request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
+ request_bytes_sent = 0;
+ }
+ }
+ break;
+ case SENDING_REQUEST: {
+ size_t to_send = request.size() - request_bytes_sent;
+ int ret;
+
+ do {
+ ret = write(sock, request.data() + request_bytes_sent, to_send);
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1) {
+ perror("write");
+ state = CLOSING_SOCKET;
+ continue;
+ }
+
+ assert(ret >= 0);
+ request_bytes_sent += ret;
+
+ if (request_bytes_sent == request.size()) {
+ state = RECEIVING_HEADER;
+ }
+ break;
+ }
+ case RECEIVING_HEADER: {
+ char buf[4096];
+ int ret;
+
+ do {
+ ret = read(sock, buf, sizeof(buf));
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1) {
+ perror("read");
+ state = CLOSING_SOCKET;
+ continue;
+ }
+
+ if (ret == 0) {
+ // This really shouldn't happen...
+ fprintf(stderr, "Socket unexpectedly closed while reading header\n");
+ state = CLOSING_SOCKET;
+ continue;
+ }
+
+ RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
+
+ if (status == RP_OUT_OF_SPACE) {
+ fprintf(stderr, "WARNING: fd %d sent overlong response!\n", sock);
+ state = CLOSING_SOCKET;
+ continue;
+ } else if (status == RP_NOT_FINISHED_YET) {
+ continue;
+ }
-void Input::curl_callback(char *ptr, size_t bytes)
+ // OK, so we're fine, but there might be some of the actual data after the response.
+ // We'll need to deal with that separately.
+ string extra_data;
+ if (status == RP_EXTRA_DATA) {
+ char *ptr = static_cast<char *>(
+ memmem(response.data(), response.size(), "\r\n\r\n", 4));
+ assert(ptr != NULL);
+ extra_data = string(ptr, &response[0] + response.size());
+ response.resize(ptr - response.data());
+ }
+
+ // TODO: Check that the response is 200, save the headers, etc.
+
+ if (!extra_data.empty()) {
+ process_data(&extra_data[0], extra_data.size());
+ }
+
+ state = RECEIVING_DATA;
+ break;
+ }
+ case RECEIVING_DATA: {
+ char buf[4096];
+ int ret;
+
+ do {
+ ret = read(sock, buf, sizeof(buf));
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1) {
+ perror("read");
+ state = CLOSING_SOCKET;
+ continue;
+ }
+
+ if (ret == 0) {
+ // This really shouldn't happen...
+ fprintf(stderr, "Socket unexpectedly closed while reading header\n");
+ state = CLOSING_SOCKET;
+ continue;
+ }
+
+ process_data(buf, ret);
+ break;
+ }
+ case CLOSING_SOCKET: {
+ int err;
+ do {
+ err = close(sock);
+ } while (err == -1 && errno == EINTR);
+
+ if (err == -1) {
+ perror("close");
+ }
+
+ state = NOT_CONNECTED;
+ break;
+ }
+ default:
+ assert(false);
+ }
+
+ // If we are still in NOT_CONNECTED, either something went wrong,
+ // or the connection just got closed.
+ // The earlier steps have already given the error message, if any.
+ if (state == NOT_CONNECTED && !should_stop) {
+ fprintf(stderr, "Waiting 0.2 second and restarting...\n");
+ usleep(200000);
+ }
+ }
+}
+
+void Input::process_data(char *ptr, size_t bytes)
{
pending_data.insert(pending_data.end(), ptr, ptr + bytes);
return;
}
- process_block(pending_data.data() + sizeof(metacube_block_header), size, flags);
+ // Send this block on to the data.
+ char *inner_data = pending_data.data() + sizeof(metacube_block_header);
+ if (flags & METACUBE_FLAGS_HEADER) {
+ string header(inner_data, inner_data + size);
+ servers->set_header(stream_id, header);
+ } else {
+ servers->add_data(stream_id, inner_data, size);
+ }
- // Consume this block. This isn't the most efficient way of dealing with things
+ // Consume the block. This isn't the most efficient way of dealing with things
// should we have many blocks, but these routines don't need to be too efficient
// anyway.
pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
has_metacube_header = false;
}
}
-
-void Input::process_block(const char *data, uint32_t size, uint32_t flags)
-{
- if (flags & METACUBE_FLAGS_HEADER) {
- string header(data, data + size);
- servers->set_header(stream_id, header);
- } else {
- servers->add_data(stream_id, data, size);
- }
-}
void Input::drop_pending_data(size_t num_bytes)
{
// Connect to the given URL and start streaming.
void run();
- // Stop streaming. NOTE: Does not currently work!
+ // Stops the streaming, but lets the file descriptor stay open.
void stop();
private:
// Actually does the download.
void do_work();
-
- // Recovers the this pointer and calls curl_callback().
- static size_t curl_callback_thunk(char *ptr, size_t size, size_t nmemb, void *userdata);
+
+ // Open a socket that connects to the given host and port. Does DNS resolving.
+ int lookup_and_connect(const std::string &host, const std::string &port);
// Stores the given data, looks for Metacube blocks (skipping data if needed),
// and calls process_block() for each one.
- void curl_callback(char *ptr, size_t bytes);
- void process_block(const char *data, uint32_t size, uint32_t flags);
+ void process_data(char *ptr, size_t bytes);
// Drops <num_bytes> bytes from the head of <pending_data>,
// and outputs a warning.
void drop_pending_data(size_t num_bytes);
+ enum State {
+ NOT_CONNECTED,
+ SENDING_REQUEST,
+ RECEIVING_HEADER,
+ RECEIVING_DATA,
+ CLOSING_SOCKET, // Due to error.
+ };
+ State state;
+
std::string stream_id;
+
+ // The URL and its parsed components.
std::string url;
+ std::string host, port, path;
+
+ // The HTTP request, with headers and all.
+ // Only relevant for SENDING_REQUEST.
+ std::string request;
+
+ // How many bytes we've sent of the request so far.
+ // Only relevant for SENDING_REQUEST.
+ size_t request_bytes_sent;
+
+ // The HTTP response we've received so far. Only relevant for RECEIVING_HEADER.
+ std::string response;
// Data we have received but not fully processed yet.
std::vector<char> pending_data;
// this is true.
bool has_metacube_header;
+ // The socket we are downloading on (or -1).
+ int sock;
+
+ // Handle to the thread that actually does the download.
pthread_t worker_thread;
// Whether we should stop or not.
projects / cubemap / commitdiff