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http-client.c
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http-client.c
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/* Copyright (c) 2013-2017 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "net.h"
#include "str.h"
#include "hash.h"
#include "array.h"
#include "ioloop.h"
#include "istream.h"
#include "ostream.h"
#include "connection.h"
#include "dns-lookup.h"
#include "iostream-rawlog.h"
#include "iostream-ssl.h"
#include "http-url.h"
#include "http-client-private.h"
#define HTTP_DEFAULT_PORT 80
#define HTTPS_DEFAULT_PORT 443
/* Structure:
http-client:
Acts much like a browser; it is not dedicated to a single host. Client can
accept requests to different hosts, which can be served at different IPs.
Redirects are handled in the background by making a new connection.
Connections to new hosts are created once needed for servicing a request.
http-client-request:
The request semantics are similar to imapc commands. Create a request,
optionally modify some aspects of it and finally submit it. Once finished,
a callback is called with the returned response.
http-client-host:
We maintain a 'cache' of hosts for which we have looked up IPs. One host
can have multiple IPs.
http-client-queue:
Requests are queued in a queue object. These queues are maintained for each
host:port target and listed in the host object. The queue object is
responsible for starting connection attempts to TCP port at the various IPs
known for the host.
http-client-peer:
The peer object groups multiple connections to the same ip/port
(== peer_addr).
http-client-connection:
This is an actual connection to a server. Once a connection is ready to
handle requests, it claims a request from a queue object. One connection can
service multiple hosts and one host can have multiple associated connections,
possibly to different ips and ports.
*/
/*
* Logging
*/
static inline void
http_client_debug(struct http_client *client,
const char *format, ...) ATTR_FORMAT(2, 3);
static inline void
http_client_debug(struct http_client *client,
const char *format, ...)
{
va_list args;
va_start(args, format);
if (client->set.debug)
i_debug("http-client: %s", t_strdup_vprintf(format, args));
va_end(args);
}
/*
* Client
*/
struct http_client *http_client_init(const struct http_client_settings *set)
{
struct http_client *client;
pool_t pool;
pool = pool_alloconly_create("http client", 1024);
client = p_new(pool, struct http_client, 1);
client->pool = pool;
client->set.dns_client = set->dns_client;
client->set.dns_client_socket_path =
p_strdup_empty(pool, set->dns_client_socket_path);
client->set.dns_ttl_msecs = (set->dns_ttl_msecs == 0 ?
HTTP_CLIENT_DEFAULT_DNS_TTL_MSECS : set->dns_ttl_msecs);
client->set.user_agent = p_strdup_empty(pool, set->user_agent);
client->set.rawlog_dir = p_strdup_empty(pool, set->rawlog_dir);
if (set->ssl != NULL)
client->set.ssl = ssl_iostream_settings_dup(client->pool, set->ssl);
if (set->proxy_socket_path != NULL && *set->proxy_socket_path != '\0') {
client->set.proxy_socket_path = p_strdup(pool, set->proxy_socket_path);
} else if (set->proxy_url != NULL) {
client->set.proxy_url = http_url_clone(pool, set->proxy_url);
}
if (set->proxy_username != NULL && *set->proxy_username != '\0') {
client->set.proxy_username = p_strdup_empty(pool, set->proxy_username);
client->set.proxy_password = p_strdup(pool, set->proxy_password);
} else if (set->proxy_url != NULL) {
client->set.proxy_username =
p_strdup_empty(pool, set->proxy_url->user);
client->set.proxy_password =
p_strdup(pool, set->proxy_url->password);
}
client->set.max_idle_time_msecs = set->max_idle_time_msecs;
client->set.max_parallel_connections =
(set->max_parallel_connections > 0 ? set->max_parallel_connections : 1);
client->set.max_pipelined_requests =
(set->max_pipelined_requests > 0 ? set->max_pipelined_requests : 1);
client->set.max_attempts = set->max_attempts;
client->set.max_connect_attempts = set->max_connect_attempts;
client->set.connect_backoff_time_msecs =
set->connect_backoff_time_msecs == 0 ?
HTTP_CLIENT_DEFAULT_BACKOFF_TIME_MSECS :
set->connect_backoff_time_msecs;
client->set.connect_backoff_max_time_msecs =
set->connect_backoff_max_time_msecs == 0 ?
HTTP_CLIENT_DEFAULT_BACKOFF_MAX_TIME_MSECS :
set->connect_backoff_max_time_msecs;
client->set.no_auto_redirect = set->no_auto_redirect;
client->set.no_auto_retry = set->no_auto_retry;
client->set.no_ssl_tunnel = set->no_ssl_tunnel;
client->set.max_redirects = set->max_redirects;
client->set.response_hdr_limits = set->response_hdr_limits;
client->set.request_absolute_timeout_msecs =
set->request_absolute_timeout_msecs;
client->set.request_timeout_msecs =
set->request_timeout_msecs == 0 ?
HTTP_CLIENT_DEFAULT_REQUEST_TIMEOUT_MSECS :
set->request_timeout_msecs;
client->set.connect_timeout_msecs = set->connect_timeout_msecs;
client->set.soft_connect_timeout_msecs = set->soft_connect_timeout_msecs;
client->set.max_auto_retry_delay = set->max_auto_retry_delay;
client->set.socket_send_buffer_size = set->socket_send_buffer_size;
client->set.socket_recv_buffer_size = set->socket_recv_buffer_size;
client->set.debug = set->debug;
i_array_init(&client->delayed_failing_requests, 1);
client->conn_list = http_client_connection_list_init();
hash_table_create(&client->hosts, default_pool, 0, str_hash, strcmp);
hash_table_create(&client->peers, default_pool, 0,
http_client_peer_addr_hash, http_client_peer_addr_cmp);
return client;
}
void http_client_deinit(struct http_client **_client)
{
struct http_client *client = *_client;
struct http_client_request *req;
struct http_client_host *host;
struct http_client_peer *peer;
*_client = NULL;
/* destroy requests without calling callbacks */
req = client->requests_list;
while (req != NULL) {
struct http_client_request *next_req = req->next;
http_client_request_destroy(&req);
req = next_req;
}
i_assert(client->requests_count == 0);
/* free peers */
while (client->peers_list != NULL) {
peer = client->peers_list;
http_client_peer_close(&peer);
}
hash_table_destroy(&client->peers);
/* free hosts */
while (client->hosts_list != NULL) {
host = client->hosts_list;
http_client_host_free(&host);
}
hash_table_destroy(&client->hosts);
array_free(&client->delayed_failing_requests);
timeout_remove(&client->to_failing_requests);
connection_list_deinit(&client->conn_list);
if (client->ssl_ctx != NULL)
ssl_iostream_context_unref(&client->ssl_ctx);
pool_unref(&client->pool);
}
void http_client_switch_ioloop(struct http_client *client)
{
struct connection *_conn = client->conn_list->connections;
struct http_client_host *host;
struct http_client_peer *peer;
/* move connections */
/* FIXME: we wouldn't necessarily need to switch all of them
immediately, only those that have requests now. but also connections
that get new requests before ioloop is switched again.. */
for (; _conn != NULL; _conn = _conn->next) {
struct http_client_connection *conn =
(struct http_client_connection *)_conn;
http_client_connection_switch_ioloop(conn);
}
/* move peers */
for (peer = client->peers_list; peer != NULL; peer = peer->next)
http_client_peer_switch_ioloop(peer);
/* move dns lookups and delayed requests */
for (host = client->hosts_list; host != NULL; host = host->next)
http_client_host_switch_ioloop(host);
/* move timeouts */
if (client->to_failing_requests != NULL) {
client->to_failing_requests =
io_loop_move_timeout(&client->to_failing_requests);
}
}
void http_client_wait(struct http_client *client)
{
struct ioloop *prev_ioloop = current_ioloop;
i_assert(client->ioloop == NULL);
if (client->requests_count == 0)
return;
client->ioloop = io_loop_create();
http_client_switch_ioloop(client);
if (client->set.dns_client != NULL)
dns_client_switch_ioloop(client->set.dns_client);
/* either we're waiting for network I/O or we're getting out of a
callback using timeout_add_short(0) */
i_assert(io_loop_have_ios(client->ioloop) ||
io_loop_have_immediate_timeouts(client->ioloop));
do {
http_client_debug(client,
"Waiting for %d requests to finish", client->requests_count);
io_loop_run(client->ioloop);
} while (client->requests_count > 0);
http_client_debug(client, "All requests finished");
io_loop_set_current(prev_ioloop);
http_client_switch_ioloop(client);
if (client->set.dns_client != NULL)
dns_client_switch_ioloop(client->set.dns_client);
io_loop_set_current(client->ioloop);
io_loop_destroy(&client->ioloop);
}
unsigned int http_client_get_pending_request_count(struct http_client *client)
{
return client->requests_count;
}
int http_client_init_ssl_ctx(struct http_client *client, const char **error_r)
{
const char *error;
if (client->ssl_ctx != NULL)
return 0;
if (client->set.ssl == NULL) {
*error_r = "Requested https connection, but no SSL settings given";
return -1;
}
if (ssl_iostream_client_context_cache_get(client->set.ssl, &client->ssl_ctx, &error) < 0) {
*error_r = t_strdup_printf("Couldn't initialize SSL context: %s",
error);
return -1;
}
return 0;
}
/*
* Delayed request errors
*/
static void
http_client_handle_request_errors(struct http_client *client)
{
struct http_client_request *const *req_idx;
timeout_remove(&client->to_failing_requests);
array_foreach(&client->delayed_failing_requests, req_idx) {
struct http_client_request *req = *req_idx;
i_assert(req->refcount == 1);
http_client_request_error_delayed(&req);
}
array_clear(&client->delayed_failing_requests);
}
void http_client_delay_request_error(struct http_client *client,
struct http_client_request *req)
{
if (client->to_failing_requests == NULL) {
client->to_failing_requests = timeout_add_short(0,
http_client_handle_request_errors, client);
}
array_append(&client->delayed_failing_requests, &req, 1);
}
void http_client_remove_request_error(struct http_client *client,
struct http_client_request *req)
{
struct http_client_request *const *reqs;
unsigned int i, count;
reqs = array_get(&client->delayed_failing_requests, &count);
for (i = 0; i < count; i++) {
if (reqs[i] == req) {
array_delete(&client->delayed_failing_requests, i, 1);
return;
}
}
}