blob: 4bbb6bc6a96f2d021c66b76f333b640a405ef5d0 [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/proxy/proxy_list.h"
#include "base/callback.h"
#include "base/logging.h"
#include "base/rand_util.h"
#include "base/strings/string_tokenizer.h"
#include "base/time/time.h"
#include "base/values.h"
#include "net/proxy/proxy_server.h"
using base::TimeDelta;
using base::TimeTicks;
namespace net {
ProxyList::ProxyList() {
}
ProxyList::~ProxyList() {
}
void ProxyList::Set(const std::string& proxy_uri_list) {
proxies_.clear();
base::StringTokenizer str_tok(proxy_uri_list, ";");
while (str_tok.GetNext()) {
ProxyServer uri = ProxyServer::FromURI(
str_tok.token_begin(), str_tok.token_end(), ProxyServer::SCHEME_HTTP);
// Silently discard malformed inputs.
if (uri.is_valid())
proxies_.push_back(uri);
}
}
void ProxyList::SetSingleProxyServer(const ProxyServer& proxy_server) {
proxies_.clear();
AddProxyServer(proxy_server);
}
void ProxyList::AddProxyServer(const ProxyServer& proxy_server) {
if (proxy_server.is_valid())
proxies_.push_back(proxy_server);
}
void ProxyList::DeprioritizeBadProxies(
const ProxyRetryInfoMap& proxy_retry_info) {
// Partition the proxy list in two:
// (1) the known bad proxies
// (2) everything else
std::vector<ProxyServer> good_proxies;
std::vector<ProxyServer> bad_proxies_to_try;
std::vector<ProxyServer>::const_iterator iter = proxies_.begin();
for (; iter != proxies_.end(); ++iter) {
ProxyRetryInfoMap::const_iterator bad_proxy =
proxy_retry_info.find(iter->ToURI());
if (bad_proxy != proxy_retry_info.end()) {
// This proxy is bad. Check if it's time to retry.
if (bad_proxy->second.bad_until >= TimeTicks::Now()) {
// still invalid.
if (bad_proxy->second.try_while_bad)
bad_proxies_to_try.push_back(*iter);
continue;
}
}
good_proxies.push_back(*iter);
}
// "proxies_ = good_proxies + bad_proxies"
proxies_.swap(good_proxies);
proxies_.insert(proxies_.end(), bad_proxies_to_try.begin(),
bad_proxies_to_try.end());
}
void ProxyList::RemoveProxiesWithoutScheme(int scheme_bit_field) {
for (std::vector<ProxyServer>::iterator it = proxies_.begin();
it != proxies_.end(); ) {
if (!(scheme_bit_field & it->scheme())) {
it = proxies_.erase(it);
continue;
}
++it;
}
}
void ProxyList::Clear() {
proxies_.clear();
}
bool ProxyList::IsEmpty() const {
return proxies_.empty();
}
size_t ProxyList::size() const {
return proxies_.size();
}
// Returns true if |*this| lists the same proxies as |other|.
bool ProxyList::Equals(const ProxyList& other) const {
if (size() != other.size())
return false;
return proxies_ == other.proxies_;
}
const ProxyServer& ProxyList::Get() const {
DCHECK(!proxies_.empty());
return proxies_[0];
}
void ProxyList::SetFromPacString(const std::string& pac_string) {
base::StringTokenizer entry_tok(pac_string, ";");
proxies_.clear();
while (entry_tok.GetNext()) {
ProxyServer uri = ProxyServer::FromPacString(
entry_tok.token_begin(), entry_tok.token_end());
// Silently discard malformed inputs.
if (uri.is_valid())
proxies_.push_back(uri);
}
// If we failed to parse anything from the PAC results list, fallback to
// DIRECT (this basically means an error in the PAC script).
if (proxies_.empty()) {
proxies_.push_back(ProxyServer::Direct());
}
}
std::string ProxyList::ToPacString() const {
std::string proxy_list;
std::vector<ProxyServer>::const_iterator iter = proxies_.begin();
for (; iter != proxies_.end(); ++iter) {
if (!proxy_list.empty())
proxy_list += ";";
proxy_list += iter->ToPacString();
}
return proxy_list.empty() ? std::string() : proxy_list;
}
base::ListValue* ProxyList::ToValue() const {
base::ListValue* list = new base::ListValue();
for (size_t i = 0; i < proxies_.size(); ++i)
list->AppendString(proxies_[i].ToURI());
return list;
}
bool ProxyList::Fallback(ProxyRetryInfoMap* proxy_retry_info,
const BoundNetLog& net_log) {
// TODO(eroman): It would be good if instead of removing failed proxies
// from the list, we simply annotated them with the error code they failed
// with. Of course, ProxyService::ReconsiderProxyAfterError() would need to
// be given this information by the network transaction.
//
// The advantage of this approach is when the network transaction
// fails, we could output the full list of proxies that were attempted, and
// why each one of those failed (as opposed to just the last failure).
//
// And also, before failing the transaction wholesale, we could go back and
// retry the "bad proxies" which we never tried to begin with.
// (RemoveBadProxies would annotate them as 'expected bad' rather then delete
// them from the list, so we would know what they were).
if (proxies_.empty()) {
NOTREACHED();
return false;
}
UpdateRetryInfoOnFallback(proxy_retry_info, base::TimeDelta(), true,
ProxyServer(), net_log);
// Remove this proxy from our list.
proxies_.erase(proxies_.begin());
return !proxies_.empty();
}
void ProxyList::AddProxyToRetryList(ProxyRetryInfoMap* proxy_retry_info,
base::TimeDelta retry_delay,
bool try_while_bad,
const ProxyServer& proxy_to_retry,
const BoundNetLog& net_log) const {
// Mark this proxy as bad.
std::string proxy_key = proxy_to_retry.ToURI();
ProxyRetryInfoMap::iterator iter = proxy_retry_info->find(proxy_key);
if (iter != proxy_retry_info->end()) {
// TODO(nsylvain): This is not the first time we get this. We should
// double the retry time. Bug 997660.
iter->second.bad_until = TimeTicks::Now() + iter->second.current_delay;
} else {
ProxyRetryInfo retry_info;
retry_info.current_delay = retry_delay;
retry_info.bad_until = TimeTicks().Now() + retry_info.current_delay;
retry_info.try_while_bad = try_while_bad;
(*proxy_retry_info)[proxy_key] = retry_info;
}
net_log.AddEvent(NetLog::TYPE_PROXY_LIST_FALLBACK,
NetLog::StringCallback("bad_proxy", &proxy_key));
}
void ProxyList::UpdateRetryInfoOnFallback(
ProxyRetryInfoMap* proxy_retry_info,
base::TimeDelta retry_delay,
bool reconsider,
const ProxyServer& another_proxy_to_bypass,
const BoundNetLog& net_log) const {
// Time to wait before retrying a bad proxy server.
if (retry_delay == base::TimeDelta()) {
#if defined(SPDY_PROXY_AUTH_ORIGIN)
// Randomize the timeout over a range from one to five minutes.
retry_delay =
TimeDelta::FromMilliseconds(
base::RandInt(1 * 60 * 1000, 5 * 60 * 1000));
#else
retry_delay = TimeDelta::FromMinutes(5);
#endif
}
if (proxies_.empty()) {
NOTREACHED();
return;
}
if (!proxies_[0].is_direct()) {
AddProxyToRetryList(proxy_retry_info, retry_delay, reconsider, proxies_[0],
net_log);
// If an additional proxy to bypass is specified, add it to the retry map
// as well.
if (another_proxy_to_bypass.is_valid()) {
AddProxyToRetryList(proxy_retry_info, retry_delay, reconsider,
another_proxy_to_bypass, net_log);
}
}
}
} // namespace net