mirror of
https://github.com/rkd77/elinks.git
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5dc479386e
Timeout is silent now.
1267 lines
32 KiB
C
1267 lines
32 KiB
C
/* Connections management */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <sys/types.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h> /* OS/2 needs this after sys/types.h */
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#endif
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#include "elinks.h"
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#include "cache/cache.h"
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#include "config/options.h"
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#include "document/document.h"
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#include "encoding/encoding.h"
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#include "intl/libintl.h"
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#include "main/object.h"
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#include "main/select.h"
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#include "main/timer.h"
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#include "network/connection.h"
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#include "network/dns.h"
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#include "network/progress.h"
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#include "network/socket.h"
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#include "network/ssl/ssl.h"
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#include "protocol/http/http.h"
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#include "protocol/protocol.h"
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#include "protocol/proxy.h"
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#include "protocol/uri.h"
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#include "session/session.h"
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#include "util/error.h"
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#include "util/memory.h"
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#include "util/string.h"
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#include "util/time.h"
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struct keepalive_connection {
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LIST_HEAD(struct keepalive_connection);
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/* XXX: This is just the URI of the connection that registered the
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* keepalive connection so only rely on the protocol, user, password,
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* host and port part. */
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struct uri *uri;
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/* Function called when the keepalive has timed out or is deleted */
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void (*done)(struct connection *);
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timeval_T timeout;
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timeval_T creation_time;
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unsigned int protocol_family:1; /* see network/socket.h, EL_PF_INET, EL_PF_INET6 */
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int socket;
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};
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static unsigned int connection_id = 0;
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static int active_connections = 0;
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static timer_id_T keepalive_timeout = TIMER_ID_UNDEF;
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static INIT_LIST_OF(struct connection, connection_queue);
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static INIT_LIST_OF(struct host_connection, host_connections);
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static INIT_LIST_OF(struct keepalive_connection, keepalive_connections);
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/* Prototypes */
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static void check_keepalive_connections(void);
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static void notify_connection_callbacks(struct connection *conn);
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static /* inline */ connection_priority_T
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get_priority(struct connection *conn)
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{
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int priority;
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for (priority = 0; priority < PRIORITIES; priority++)
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if (conn->pri[priority])
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break;
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assertm(priority != PRIORITIES, "Connection has no owner");
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/* Recovery path ;-). (XXX?) */
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return priority;
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}
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int
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get_connections_count(void)
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{
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return list_size(&connection_queue);
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}
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int
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get_keepalive_connections_count(void)
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{
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return list_size(&keepalive_connections);
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}
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int
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get_connections_connecting_count(void)
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{
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struct connection *conn;
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int i = 0;
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foreach (conn, connection_queue)
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i += is_in_connecting_state(conn->state);
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return i;
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}
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int
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get_connections_transfering_count(void)
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{
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struct connection *conn;
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int i = 0;
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foreach (conn, connection_queue)
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i += is_in_transfering_state(conn->state);
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return i;
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}
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/** Check whether the pointer @a conn still points to a connection
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* with the given @a id. If the struct connection has already been
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* freed, this returns 0. By comparing connection.id, this function
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* can usually detect even the case where a different connection has
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* been created at the same address. For that to work, the caller
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* must save the connection.id before the connection can be deleted. */
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static inline int
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connection_disappeared(struct connection *conn, unsigned int id)
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{
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struct connection *c;
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foreach (c, connection_queue)
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if (conn == c && id == c->id)
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return 0;
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return 1;
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}
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/* Host connection management: */
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/* Used to keep track on the number of connections to any given host. When
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* trying to setup a new connection the list is searched to see if the maximum
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* number of connection has been reached. If that is the case we try to suspend
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* an already established connection. */
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/* Some connections (like file://) that do not involve hosts are not maintained
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* in the list. */
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struct host_connection {
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OBJECT_HEAD(struct host_connection);
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/* XXX: This is just the URI of the connection that registered the
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* host connection so only rely on the host part. */
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struct uri *uri;
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};
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static struct host_connection *
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get_host_connection(struct connection *conn)
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{
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struct host_connection *host_conn;
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if (!conn->uri->host) return NULL;
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foreach (host_conn, host_connections)
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if (compare_uri(host_conn->uri, conn->uri, URI_HOST))
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return host_conn;
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return NULL;
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}
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/* Returns if the connection was successfully added. */
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/* Don't add hostnameless host connections but they're valid. */
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static int
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add_host_connection(struct connection *conn)
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{
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struct host_connection *host_conn = get_host_connection(conn);
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if (!host_conn && conn->uri->host) {
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host_conn = (struct host_connection *)mem_calloc(1, sizeof(*host_conn));
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if (!host_conn) return 0;
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host_conn->uri = get_uri_reference(conn->uri);
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object_nolock(host_conn, "host_connection");
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add_to_list(host_connections, host_conn);
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}
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if (host_conn) object_lock(host_conn);
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return 1;
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}
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/* Decrements and free()s the host connection if it is the last 'refcount'. */
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static void
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done_host_connection(struct connection *conn)
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{
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struct host_connection *host_conn = get_host_connection(conn);
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if (!host_conn) return;
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object_unlock(host_conn);
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if (is_object_used(host_conn)) return;
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del_from_list(host_conn);
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done_uri(host_conn->uri);
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mem_free(host_conn);
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}
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static void sort_queue();
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#ifdef CONFIG_DEBUG
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static void
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check_queue_bugs(void)
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{
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struct connection *conn;
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connection_priority_T prev_priority = 0;
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int cc = 0;
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foreach (conn, connection_queue) {
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connection_priority_T priority = get_priority(conn);
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cc += conn->running;
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assertm(priority >= prev_priority, "queue is not sorted");
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assertm(is_in_progress_state(conn->state),
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"interrupted connection on queue (conn %s, state %d)",
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struri(conn->uri), conn->state);
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prev_priority = priority;
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}
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assertm(cc == active_connections,
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"bad number of active connections (counted %d, stored %d)",
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cc, active_connections);
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}
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#else
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#define check_queue_bugs()
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#endif
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static void
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set_connection_socket_state(struct socket *socket, struct connection_state state)
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{
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assert(socket);
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set_connection_state((struct connection *)socket->conn, state);
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}
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static void
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set_connection_socket_timeout(struct socket *socket, struct connection_state state)
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{
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assert(socket);
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set_connection_timeout((struct connection *)socket->conn);
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}
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static void
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retry_connection_socket(struct socket *socket, struct connection_state state)
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{
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assert(socket);
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retry_connection((struct connection *)socket->conn, state);
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}
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static void
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done_connection_socket(struct socket *socket, struct connection_state state)
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{
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assert(socket);
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abort_connection((struct connection *)socket->conn, state);
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}
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static struct connection *
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init_connection(struct uri *uri, struct uri *proxied_uri, struct uri *referrer,
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off_t start, cache_mode_T cache_mode,
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connection_priority_T priority)
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{
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static struct socket_operations connection_socket_operations = {
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set_connection_socket_state,
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set_connection_socket_timeout,
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retry_connection_socket,
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done_connection_socket,
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};
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struct connection *conn = (struct connection *)mem_calloc(1, sizeof(*conn));
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if (!conn) return NULL;
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assert(proxied_uri->protocol != PROTOCOL_PROXY);
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conn->socket = init_socket(conn, &connection_socket_operations);
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if (!conn->socket) {
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mem_free(conn);
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return NULL;
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}
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conn->data_socket = init_socket(conn, &connection_socket_operations);
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if (!conn->data_socket) {
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mem_free(conn->socket);
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mem_free(conn);
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return NULL;
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}
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conn->progress = init_progress(start);
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if (!conn->progress) {
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mem_free(conn->data_socket);
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mem_free(conn->socket);
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mem_free(conn);
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return NULL;
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}
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/* load_uri() gets the URI from get_proxy() which grabs a reference for
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* us. */
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conn->uri = uri;
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conn->proxied_uri = proxied_uri;
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conn->id = connection_id++;
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conn->pri[priority] = 1;
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conn->cache_mode = cache_mode;
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conn->content_encoding = ENCODING_NONE;
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init_list(conn->downloads);
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conn->est_length = -1;
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conn->timer = TIMER_ID_UNDEF;
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if (referrer) {
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/* Don't set referrer when it is the file protocol and the URI
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* being loaded is not. This means CGI scripts will have it
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* available while preventing information about the local
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* system from being leaked to external servers. */
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if (referrer->protocol != PROTOCOL_FILE
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|| uri->protocol == PROTOCOL_FILE)
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conn->referrer = get_uri_reference(referrer);
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}
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return conn;
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}
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static void
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update_connection_progress(struct connection *conn)
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{
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update_progress(conn->progress, conn->received, conn->est_length, conn->from);
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}
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/** Progress timer callback for @a conn->progress. */
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static void
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stat_timer(struct connection *conn)
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{
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update_connection_progress(conn);
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notify_connection_callbacks(conn);
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}
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/** Progress timer callback for @a conn->upload_progress. */
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static void
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upload_stat_timer(struct connection *conn)
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{
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struct http_connection_info *http = (struct http_connection_info *)conn->info;
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assert(conn->http_upload_progress);
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assert(http);
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if_assert_failed return;
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update_progress(conn->http_upload_progress, http->post.uploaded,
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http->post.total_upload_length, http->post.uploaded);
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notify_connection_callbacks(conn);
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}
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void
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set_connection_state(struct connection *conn, struct connection_state state)
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{
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struct download *download;
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struct progress *progress = conn->progress;
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struct progress *upload_progress = conn->http_upload_progress;
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if (is_in_result_state(conn->state) && is_in_progress_state(state))
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conn->prev_error = conn->state;
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conn->state = state;
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if (is_in_state(conn->state, S_TRANS)) {
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const unsigned int id = conn->id;
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if (upload_progress && upload_progress->timer == TIMER_ID_UNDEF) {
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start_update_progress(upload_progress,
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(void (*)(void *)) upload_stat_timer, conn);
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upload_stat_timer(conn);
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if (connection_disappeared(conn, id))
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return;
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}
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if (progress->timer == TIMER_ID_UNDEF) {
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start_update_progress(progress, (void (*)(void *)) stat_timer, conn);
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update_connection_progress(conn);
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if (connection_disappeared(conn, id))
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return;
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}
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} else {
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kill_timer(&progress->timer);
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if (upload_progress) kill_timer(&upload_progress->timer);
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}
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foreach (download, conn->downloads) {
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download->state = state;
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download->prev_error = conn->prev_error;
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}
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if (is_in_progress_state(state)) notify_connection_callbacks(conn);
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}
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void
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shutdown_connection_stream(struct connection *conn)
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{
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if (conn->stream) {
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close_encoded(conn->stream);
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conn->stream = NULL;
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}
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}
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static void
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free_connection_data(struct connection *conn)
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{
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assertm(conn->running, "connection already suspended");
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/* XXX: Recovery path? Originally, there was none. I think we'll get
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* at least active_connections underflows along the way. --pasky */
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conn->running = 0;
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active_connections--;
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assertm(active_connections >= 0, "active connections underflow");
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if_assert_failed active_connections = 0;
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#ifdef CONFIG_SSL
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if (conn->socket->ssl && conn->cached)
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mem_free_set(&conn->cached->ssl_info, get_ssl_connection_cipher(conn->socket));
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#endif
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if (conn->done)
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conn->done(conn);
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done_socket(conn->socket);
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done_socket(conn->data_socket);
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shutdown_connection_stream(conn);
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mem_free_set(&conn->info, NULL);
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/* If conn->done is not NULL, it probably points to a function
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* that expects conn->info to be a specific kind of structure.
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* Such a function should not be called if a different pointer
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* is later assigned to conn->info. Actually though, each
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* free_connection_data() call seems to be soon followed by
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* done_connection() so that conn->done would not be called
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* again in any case. However, this assignment costs little
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* and may make things a bit safer. */
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conn->done = NULL;
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kill_timer(&conn->timer);
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if (!is_in_state(conn->state, S_WAIT))
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done_host_connection(conn);
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}
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static void
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notify_connection_callbacks(struct connection *conn)
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{
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struct connection_state state = conn->state;
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unsigned int id = conn->id;
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struct download *download, *next;
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foreachsafe (download, next, conn->downloads) {
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download->cached = conn->cached;
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if (download->callback)
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download->callback(download, download->data);
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if (is_in_progress_state(state)
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&& connection_disappeared(conn, id))
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return;
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}
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}
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static void
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done_connection(struct connection *conn)
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{
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/* When removing the connection callbacks should always be aware of it
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* so they can unregister themselves. We do this by enforcing that the
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* connection is in a result state. If it is not already it is an
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* internal bug. This should never happen but it does. ;) --jonas */
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if (!is_in_result_state(conn->state))
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set_connection_state(conn, connection_state(S_INTERNAL));
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del_from_list(conn);
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notify_connection_callbacks(conn);
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if (conn->referrer) done_uri(conn->referrer);
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done_uri(conn->uri);
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done_uri(conn->proxied_uri);
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mem_free(conn->socket);
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mem_free(conn->data_socket);
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done_progress(conn->progress);
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if (conn->http_upload_progress)
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done_progress(conn->http_upload_progress);
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mem_free(conn);
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check_queue_bugs();
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}
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static inline void
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add_to_queue(struct connection *conn)
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{
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struct connection *c;
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connection_priority_T priority = get_priority(conn);
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foreach (c, connection_queue)
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if (get_priority(c) > priority)
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break;
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add_at_pos(c->prev, conn);
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}
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/* Returns zero if no callback was done and the keepalive connection should be
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* deleted or non-zero if the keepalive connection should not be deleted. */
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static int
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do_keepalive_connection_callback(struct keepalive_connection *keep_conn)
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{
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struct uri *proxied_uri = get_proxied_uri(keep_conn->uri);
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struct uri *proxy_uri = get_proxy_uri(keep_conn->uri, NULL);
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if (proxied_uri && proxy_uri) {
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struct connection *conn;
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conn = init_connection(proxy_uri, proxied_uri, NULL, 0,
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CACHE_MODE_NEVER, PRI_CANCEL);
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if (conn) {
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void (*done)(struct connection *) = keep_conn->done;
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add_to_queue(conn);
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/* Get the keepalive info and let it clean up */
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if (!has_keepalive_connection(conn)
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|| !add_host_connection(conn)) {
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free_connection_data(conn);
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done_connection(conn);
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return 0;
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}
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active_connections++;
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conn->running = 1;
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done(conn);
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return 1;
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}
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}
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if (proxied_uri) done_uri(proxied_uri);
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if (proxy_uri) done_uri(proxy_uri);
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return 0;
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}
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static inline void
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done_keepalive_connection(struct keepalive_connection *keep_conn)
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{
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if (keep_conn->done && do_keepalive_connection_callback(keep_conn))
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return;
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del_from_list(keep_conn);
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if (keep_conn->socket != -1) close(keep_conn->socket);
|
|
done_uri(keep_conn->uri);
|
|
mem_free(keep_conn);
|
|
}
|
|
|
|
static struct keepalive_connection *
|
|
init_keepalive_connection(struct connection *conn, long timeout_in_seconds,
|
|
void (*done)(struct connection *))
|
|
{
|
|
struct keepalive_connection *keep_conn;
|
|
struct uri *uri = conn->uri;
|
|
|
|
assert(uri->host);
|
|
if_assert_failed return NULL;
|
|
|
|
keep_conn = (struct keepalive_connection *)mem_calloc(1, sizeof(*keep_conn));
|
|
if (!keep_conn) return NULL;
|
|
|
|
keep_conn->uri = get_uri_reference(uri);
|
|
keep_conn->done = done;
|
|
keep_conn->protocol_family = conn->socket->protocol_family;
|
|
keep_conn->socket = conn->socket->fd;
|
|
timeval_from_seconds(&keep_conn->timeout, timeout_in_seconds);
|
|
timeval_now(&keep_conn->creation_time);
|
|
|
|
return keep_conn;
|
|
}
|
|
|
|
static struct keepalive_connection *
|
|
get_keepalive_connection(struct connection *conn)
|
|
{
|
|
struct keepalive_connection *keep_conn;
|
|
|
|
if (!conn->uri->host) return NULL;
|
|
|
|
foreach (keep_conn, keepalive_connections)
|
|
if (compare_uri(keep_conn->uri, conn->uri, URI_KEEPALIVE))
|
|
return keep_conn;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int
|
|
has_keepalive_connection(struct connection *conn)
|
|
{
|
|
struct keepalive_connection *keep_conn = get_keepalive_connection(conn);
|
|
|
|
if (!keep_conn) return 0;
|
|
|
|
conn->socket->fd = keep_conn->socket;
|
|
conn->socket->protocol_family = keep_conn->protocol_family;
|
|
|
|
/* Mark that the socket should not be closed and the callback should be
|
|
* ignored. */
|
|
keep_conn->socket = -1;
|
|
keep_conn->done = NULL;
|
|
done_keepalive_connection(keep_conn);
|
|
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
add_keepalive_connection(struct connection *conn, long timeout_in_seconds,
|
|
void (*done)(struct connection *))
|
|
{
|
|
struct keepalive_connection *keep_conn;
|
|
|
|
assertm(conn->socket->fd != -1, "keepalive connection not connected");
|
|
if_assert_failed goto done;
|
|
|
|
keep_conn = init_keepalive_connection(conn, timeout_in_seconds, done);
|
|
if (keep_conn) {
|
|
/* Make sure that the socket descriptor will not periodically be
|
|
* checked or closed by free_connection_data(). */
|
|
clear_handlers(conn->socket->fd);
|
|
conn->socket->fd = -1;
|
|
add_to_list(keepalive_connections, keep_conn);
|
|
|
|
} else if (done) {
|
|
/* It will take just a little more time */
|
|
done(conn);
|
|
return;
|
|
}
|
|
|
|
done:
|
|
free_connection_data(conn);
|
|
done_connection(conn);
|
|
register_check_queue();
|
|
}
|
|
|
|
/* Timer callback for @keepalive_timeout. As explained in @install_timer,
|
|
* this function must erase the expired timer ID from all variables. */
|
|
static void
|
|
keepalive_timer(void *x)
|
|
{
|
|
keepalive_timeout = TIMER_ID_UNDEF;
|
|
/* The expired timer ID has now been erased. */
|
|
check_keepalive_connections();
|
|
}
|
|
|
|
void
|
|
check_keepalive_connections(void)
|
|
{
|
|
struct keepalive_connection *keep_conn, *next;
|
|
timeval_T now;
|
|
int p = 0;
|
|
|
|
timeval_now(&now);
|
|
|
|
kill_timer(&keepalive_timeout);
|
|
|
|
foreachsafe (keep_conn, next, keepalive_connections) {
|
|
timeval_T age;
|
|
|
|
if (can_read(keep_conn->socket)) {
|
|
done_keepalive_connection(keep_conn);
|
|
continue;
|
|
}
|
|
|
|
timeval_sub(&age, &keep_conn->creation_time, &now);
|
|
if (timeval_cmp(&age, &keep_conn->timeout) > 0) {
|
|
done_keepalive_connection(keep_conn);
|
|
continue;
|
|
}
|
|
|
|
p++;
|
|
}
|
|
|
|
for (; p > MAX_KEEPALIVE_CONNECTIONS; p--) {
|
|
assertm(!list_empty(keepalive_connections), "keepalive list empty");
|
|
if_assert_failed return;
|
|
done_keepalive_connection((struct keepalive_connection *)keepalive_connections.prev);
|
|
}
|
|
|
|
if (!list_empty(keepalive_connections))
|
|
install_timer(&keepalive_timeout, KEEPALIVE_CHECK_TIME,
|
|
keepalive_timer, NULL);
|
|
}
|
|
|
|
static inline void
|
|
abort_all_keepalive_connections(void)
|
|
{
|
|
while (!list_empty(keepalive_connections))
|
|
done_keepalive_connection((struct keepalive_connection *)keepalive_connections.next);
|
|
|
|
check_keepalive_connections();
|
|
}
|
|
|
|
|
|
static void
|
|
sort_queue(void)
|
|
{
|
|
while (1) {
|
|
struct connection *conn;
|
|
int swp = 0;
|
|
|
|
foreach (conn, connection_queue) {
|
|
if (!list_has_next(connection_queue, conn)) break;
|
|
|
|
if (get_priority(conn->next) < get_priority(conn)) {
|
|
struct connection *c = conn->next;
|
|
|
|
del_from_list(conn);
|
|
add_at_pos(c, conn);
|
|
swp = 1;
|
|
}
|
|
}
|
|
|
|
if (!swp) break;
|
|
};
|
|
}
|
|
|
|
static void
|
|
interrupt_connection(struct connection *conn)
|
|
{
|
|
free_connection_data(conn);
|
|
}
|
|
|
|
static inline void
|
|
suspend_connection(struct connection *conn)
|
|
{
|
|
interrupt_connection(conn);
|
|
set_connection_state(conn, connection_state(S_WAIT));
|
|
}
|
|
|
|
static void
|
|
run_connection(struct connection *conn)
|
|
{
|
|
protocol_handler_T *func = get_protocol_handler(conn->uri->protocol);
|
|
|
|
assert(func);
|
|
|
|
assertm(!conn->running, "connection already running");
|
|
if_assert_failed return;
|
|
|
|
if (!add_host_connection(conn)) {
|
|
set_connection_state(conn, connection_state(S_OUT_OF_MEM));
|
|
done_connection(conn);
|
|
return;
|
|
}
|
|
|
|
active_connections++;
|
|
conn->running = 1;
|
|
|
|
func(conn);
|
|
}
|
|
|
|
/* Set certain state on a connection and then abort the connection. */
|
|
void
|
|
abort_connection(struct connection *conn, struct connection_state state)
|
|
{
|
|
assertm(is_in_result_state(state),
|
|
"connection didn't end in result state (%d)", state);
|
|
|
|
if (is_in_state(state, S_OK) && conn->cached)
|
|
normalize_cache_entry(conn->cached, conn->from);
|
|
|
|
set_connection_state(conn, state);
|
|
|
|
if (conn->running) interrupt_connection(conn);
|
|
done_connection(conn);
|
|
register_check_queue();
|
|
}
|
|
|
|
/* Set certain state on a connection and then retry the connection. */
|
|
void
|
|
retry_connection(struct connection *conn, struct connection_state state)
|
|
{
|
|
int max_tries = get_opt_int("connection.retries", NULL);
|
|
|
|
assertm(is_in_result_state(state),
|
|
"connection didn't end in result state (%d)", state);
|
|
|
|
set_connection_state(conn, state);
|
|
|
|
interrupt_connection(conn);
|
|
if (conn->uri->post || (max_tries && ++conn->tries >= max_tries)) {
|
|
done_connection(conn);
|
|
register_check_queue();
|
|
} else {
|
|
conn->prev_error = conn->state;
|
|
run_connection(conn);
|
|
}
|
|
}
|
|
|
|
static int
|
|
try_to_suspend_connection(struct connection *conn, struct uri *uri)
|
|
{
|
|
connection_priority_T priority = get_priority(conn);
|
|
struct connection *c;
|
|
|
|
foreachback (c, connection_queue) {
|
|
if (get_priority(c) <= priority) return -1;
|
|
if (is_in_state(c->state, S_WAIT)) continue;
|
|
if (c->uri->post && get_priority(c) < PRI_CANCEL) continue;
|
|
if (uri && !compare_uri(uri, c->uri, URI_HOST)) continue;
|
|
suspend_connection(c);
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static inline int
|
|
try_connection(struct connection *conn, int max_conns_to_host, int max_conns)
|
|
{
|
|
struct host_connection *host_conn = get_host_connection(conn);
|
|
|
|
if (host_conn && get_object_refcount(host_conn) >= max_conns_to_host)
|
|
return try_to_suspend_connection(conn, host_conn->uri) ? 0 : -1;
|
|
|
|
if (active_connections >= max_conns)
|
|
return try_to_suspend_connection(conn, NULL) ? 0 : -1;
|
|
|
|
run_connection(conn);
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
check_queue(void)
|
|
{
|
|
struct connection *conn;
|
|
int max_conns_to_host = get_opt_int("connection.max_connections_to_host", NULL);
|
|
int max_conns = get_opt_int("connection.max_connections", NULL);
|
|
|
|
again:
|
|
conn = (struct connection *)connection_queue.next;
|
|
check_queue_bugs();
|
|
check_keepalive_connections();
|
|
|
|
while (conn != (struct connection *) &connection_queue) {
|
|
struct connection *c;
|
|
connection_priority_T pri = get_priority(conn);
|
|
|
|
for (c = conn; c != (struct connection *) &connection_queue && get_priority(c) == pri;) {
|
|
struct connection *cc = c;
|
|
|
|
c = c->next;
|
|
if (is_in_state(cc->state, S_WAIT)
|
|
&& get_keepalive_connection(cc)
|
|
&& try_connection(cc, max_conns_to_host, max_conns))
|
|
goto again;
|
|
}
|
|
|
|
for (c = conn; c != (struct connection *) &connection_queue && get_priority(c) == pri;) {
|
|
struct connection *cc = c;
|
|
|
|
c = c->next;
|
|
if (is_in_state(cc->state, S_WAIT)
|
|
&& try_connection(cc, max_conns_to_host, max_conns))
|
|
goto again;
|
|
}
|
|
conn = c;
|
|
}
|
|
|
|
again2:
|
|
foreachback (conn, connection_queue) {
|
|
if (get_priority(conn) < PRI_CANCEL) break;
|
|
if (is_in_state(conn->state, S_WAIT)) {
|
|
set_connection_state(conn, connection_state(S_INTERRUPTED));
|
|
done_connection(conn);
|
|
goto again2;
|
|
}
|
|
}
|
|
|
|
check_queue_bugs();
|
|
}
|
|
|
|
int
|
|
register_check_queue(void)
|
|
{
|
|
return register_bottom_half(check_queue, NULL);
|
|
}
|
|
|
|
int
|
|
load_uri(struct uri *uri, struct uri *referrer, struct download *download,
|
|
connection_priority_T pri, cache_mode_T cache_mode, off_t start)
|
|
{
|
|
struct cache_entry *cached;
|
|
struct connection *conn;
|
|
struct uri *proxy_uri, *proxied_uri;
|
|
struct connection_state error_state = connection_state(S_OK);
|
|
|
|
if (download) {
|
|
download->conn = NULL;
|
|
download->cached = NULL;
|
|
download->pri = pri;
|
|
download->state = connection_state(S_OUT_OF_MEM);
|
|
download->prev_error = connection_state(0);
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG
|
|
foreach (conn, connection_queue) {
|
|
struct download *assigned;
|
|
|
|
foreach (assigned, conn->downloads) {
|
|
assertm(assigned != download, "Download assigned to '%s'", struri(conn->uri));
|
|
if_assert_failed {
|
|
download->state = connection_state(S_INTERNAL);
|
|
if (download->callback)
|
|
download->callback(download, download->data);
|
|
return 0;
|
|
}
|
|
/* No recovery path should be necessary. */
|
|
}
|
|
}
|
|
#endif
|
|
|
|
cached = get_validated_cache_entry(uri, cache_mode);
|
|
if (cached) {
|
|
if (download) {
|
|
download->cached = cached;
|
|
download->state = connection_state(S_OK);
|
|
/* XXX:
|
|
* This doesn't work since sometimes |download->progress|
|
|
* is undefined and contains random memory locations.
|
|
* It's not supposed to point on anything here since
|
|
* |download| has no connection attached.
|
|
* Downloads resuming will probably break in some
|
|
* cases without this, though.
|
|
* FIXME: Needs more investigation. --pasky */
|
|
/* if (download->progress) download->progress->start = start; */
|
|
if (download->callback)
|
|
download->callback(download, download->data);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
proxied_uri = get_proxied_uri(uri);
|
|
proxy_uri = get_proxy_uri(uri, &error_state);
|
|
|
|
if (!proxy_uri
|
|
|| !proxied_uri
|
|
|| (get_protocol_need_slash_after_host(proxy_uri->protocol)
|
|
&& !proxy_uri->hostlen)) {
|
|
|
|
if (download) {
|
|
if (is_in_state(error_state, S_OK)) {
|
|
error_state = proxy_uri && proxied_uri
|
|
? connection_state(S_BAD_URL)
|
|
: connection_state(S_OUT_OF_MEM);
|
|
}
|
|
|
|
download->state = error_state;
|
|
download->callback(download, download->data);
|
|
}
|
|
if (proxy_uri) done_uri(proxy_uri);
|
|
if (proxied_uri) done_uri(proxied_uri);
|
|
return -1;
|
|
}
|
|
|
|
foreach (conn, connection_queue) {
|
|
if (conn->detached
|
|
|| !compare_uri(conn->uri, proxy_uri, 0))
|
|
continue;
|
|
|
|
done_uri(proxy_uri);
|
|
done_uri(proxied_uri);
|
|
|
|
if (get_priority(conn) > pri) {
|
|
del_from_list(conn);
|
|
conn->pri[pri]++;
|
|
add_to_queue(conn);
|
|
register_check_queue();
|
|
} else {
|
|
conn->pri[pri]++;
|
|
}
|
|
|
|
if (download) {
|
|
download->progress = conn->progress;
|
|
download->conn = conn;
|
|
download->cached = conn->cached;
|
|
add_to_list(conn->downloads, download);
|
|
/* This is likely to call download->callback() now! */
|
|
set_connection_state(conn, conn->state);
|
|
}
|
|
check_queue_bugs();
|
|
return 0;
|
|
}
|
|
|
|
if (download && cache_mode == CACHE_MODE_ALWAYS) {
|
|
cached = find_in_cache(uri);
|
|
if (cached) {
|
|
download->cached = cached;
|
|
download->state = connection_state(S_OK);
|
|
if (download->callback)
|
|
download->callback(download, download->data);
|
|
if (proxy_uri) done_uri(proxy_uri);
|
|
if (proxied_uri) done_uri(proxied_uri);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
conn = init_connection(proxy_uri, proxied_uri, referrer, start, cache_mode, pri);
|
|
if (!conn) {
|
|
if (download) {
|
|
download->state = connection_state(S_OUT_OF_MEM);
|
|
download->callback(download, download->data);
|
|
}
|
|
if (proxy_uri) done_uri(proxy_uri);
|
|
if (proxied_uri) done_uri(proxied_uri);
|
|
return -1;
|
|
}
|
|
|
|
if (cache_mode < CACHE_MODE_FORCE_RELOAD && cached && !list_empty(cached->frag)
|
|
&& !((struct fragment *) cached->frag.next)->offset)
|
|
conn->from = ((struct fragment *) cached->frag.next)->length;
|
|
|
|
if (download) {
|
|
download->progress = conn->progress;
|
|
download->conn = conn;
|
|
download->cached = NULL;
|
|
download->state = connection_state(S_OK);
|
|
add_to_list(conn->downloads, download);
|
|
}
|
|
|
|
add_to_queue(conn);
|
|
set_connection_state(conn, connection_state(S_WAIT));
|
|
|
|
check_queue_bugs();
|
|
|
|
register_check_queue();
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* FIXME: one object in more connections */
|
|
void
|
|
cancel_download(struct download *download, int interrupt)
|
|
{
|
|
struct connection *conn;
|
|
|
|
assert(download);
|
|
if_assert_failed return;
|
|
|
|
/* Did the connection already end? */
|
|
if (is_in_result_state(download->state))
|
|
return;
|
|
|
|
assertm(download->conn != NULL, "last state is %d", download->state);
|
|
|
|
check_queue_bugs();
|
|
|
|
download->state = connection_state(S_INTERRUPTED);
|
|
del_from_list(download);
|
|
|
|
conn = download->conn;
|
|
|
|
conn->pri[download->pri]--;
|
|
assertm(conn->pri[download->pri] >= 0, "priority counter underflow");
|
|
if_assert_failed conn->pri[download->pri] = 0;
|
|
|
|
if (list_empty(conn->downloads)) {
|
|
/* Necessary because of assertion in get_priority(). */
|
|
conn->pri[PRI_CANCEL]++;
|
|
|
|
if (conn->detached || interrupt)
|
|
abort_connection(conn, connection_state(S_INTERRUPTED));
|
|
}
|
|
|
|
sort_queue();
|
|
check_queue_bugs();
|
|
|
|
register_check_queue();
|
|
}
|
|
|
|
void
|
|
move_download(struct download *old, struct download *new_,
|
|
connection_priority_T newpri)
|
|
{
|
|
struct connection *conn;
|
|
|
|
assert(old);
|
|
|
|
/* The download doesn't necessarily have a connection attached, for
|
|
* example the file protocol loads it's object immediately. This is
|
|
* catched by the result state check below. */
|
|
|
|
conn = old->conn;
|
|
|
|
new_->conn = conn;
|
|
new_->cached = old->cached;
|
|
new_->prev_error = old->prev_error;
|
|
new_->progress = old->progress;
|
|
new_->state = old->state;
|
|
new_->pri = newpri;
|
|
|
|
if (is_in_result_state(old->state)) {
|
|
/* Ensure that new_->conn is always "valid", that is NULL if the
|
|
* connection has been detached and non-NULL otherwise. */
|
|
if (new_->callback) {
|
|
new_->conn = NULL;
|
|
new_->progress = NULL;
|
|
new_->callback(new_, new_->data);
|
|
}
|
|
return;
|
|
}
|
|
|
|
assertm(old->conn != NULL, "last state is %d", old->state);
|
|
|
|
conn->pri[new_->pri]++;
|
|
add_to_list(conn->downloads, new_);
|
|
/* In principle, we need to sort_queue() only if conn->pri[new_->pri]
|
|
* just changed from 0 to 1. But the risk of bugs is smaller if we
|
|
* sort every time. */
|
|
sort_queue();
|
|
|
|
cancel_download(old, 0);
|
|
}
|
|
|
|
|
|
/* This will remove 'pos' bytes from the start of the cache for the specified
|
|
* connection, if the cached object is already too big. */
|
|
void
|
|
detach_connection(struct download *download, off_t pos)
|
|
{
|
|
struct connection *conn = download->conn;
|
|
|
|
if (is_in_result_state(download->state)) return;
|
|
|
|
if (!conn->detached) {
|
|
off_t total_len;
|
|
off_t i, total_pri = 0;
|
|
|
|
if (!conn->cached)
|
|
return;
|
|
|
|
total_len = (conn->est_length == -1) ? conn->from
|
|
: conn->est_length;
|
|
|
|
if (total_len < (get_opt_long("document.cache.memory.size",
|
|
NULL)
|
|
* MAX_CACHED_OBJECT_PERCENT / 100)) {
|
|
/* This whole thing will fit to the memory anyway, so
|
|
* there's no problem in detaching the connection. */
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < PRI_CANCEL; i++)
|
|
total_pri += conn->pri[i];
|
|
assertm(total_pri, "detaching free connection");
|
|
/* No recovery path should be necessary...? */
|
|
|
|
/* Pre-clean cache. */
|
|
shrink_format_cache(0);
|
|
|
|
if (total_pri != 1 || is_object_used(conn->cached)) {
|
|
/* We're too important, or someone uses our cache
|
|
* entry. */
|
|
return;
|
|
}
|
|
|
|
/* DBG("detached"); */
|
|
|
|
/* We aren't valid cache entry anymore. */
|
|
conn->cached->valid = 0;
|
|
conn->detached = 1;
|
|
}
|
|
|
|
/* Strip the entry. */
|
|
free_entry_to(conn->cached, pos);
|
|
}
|
|
|
|
/* Timer callback for @conn->timer. As explained in @install_timer,
|
|
* this function must erase the expired timer ID from all variables. */
|
|
static void
|
|
connection_timeout(struct connection *conn)
|
|
{
|
|
conn->timer = TIMER_ID_UNDEF;
|
|
/* The expired timer ID has now been erased. */
|
|
timeout_socket(conn->socket);
|
|
}
|
|
|
|
/* Timer callback for @conn->timer. As explained in @install_timer,
|
|
* this function must erase the expired timer ID from all variables.
|
|
*
|
|
* Huh, using two timers? Is this to account for changes of c->unrestartable
|
|
* or can it be reduced? --jonas */
|
|
static void
|
|
connection_timeout_1(struct connection *conn)
|
|
{
|
|
install_timer(&conn->timer, (milliseconds_T)
|
|
((conn->unrestartable
|
|
? get_opt_int("connection.unrestartable_receive_timeout", NULL)
|
|
: get_opt_int("connection.receive_timeout", NULL))
|
|
* 500), (void (*)(void *)) connection_timeout, conn);
|
|
/* The expired timer ID has now been erased. */
|
|
}
|
|
|
|
void
|
|
set_connection_timeout(struct connection *conn)
|
|
{
|
|
if (conn->xhr_timeout) {
|
|
return;
|
|
}
|
|
kill_timer(&conn->timer);
|
|
|
|
install_timer(&conn->timer, (milliseconds_T)
|
|
((conn->unrestartable
|
|
? get_opt_int("connection.unrestartable_receive_timeout", NULL)
|
|
: get_opt_int("connection.receive_timeout", NULL))
|
|
* 500), (void (*)(void *)) connection_timeout_1, conn);
|
|
}
|
|
|
|
static void
|
|
connection_timeout_xhr_1(struct connection *conn)
|
|
{
|
|
install_timer(&conn->timer, conn->xhr_timeout / 2, (void (*)(void *)) connection_timeout, conn);
|
|
}
|
|
|
|
void
|
|
set_connection_timeout_xhr(struct connection *conn, milliseconds_T timeout)
|
|
{
|
|
kill_timer(&conn->timer);
|
|
conn->xhr_timeout = timeout;
|
|
install_timer(&conn->timer, timeout / 2, (void (*)(void *)) connection_timeout_xhr_1, conn);
|
|
}
|
|
|
|
void
|
|
abort_all_connections(void)
|
|
{
|
|
while (!list_empty(connection_queue)) {
|
|
abort_connection((struct connection *)connection_queue.next,
|
|
connection_state(S_INTERRUPTED));
|
|
}
|
|
|
|
abort_all_keepalive_connections();
|
|
}
|
|
|
|
void
|
|
abort_background_connections(void)
|
|
{
|
|
struct connection *conn, *next;
|
|
|
|
foreachsafe (conn, next, connection_queue) {
|
|
if (get_priority(conn) >= PRI_CANCEL)
|
|
abort_connection(conn, connection_state(S_INTERRUPTED));
|
|
}
|
|
}
|
|
|
|
int
|
|
is_entry_used(struct cache_entry *cached)
|
|
{
|
|
struct connection *conn;
|
|
|
|
foreach (conn, connection_queue)
|
|
if (conn->cached == cached)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|