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// 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.
#ifndef NET_PROXY_PROXY_LIST_H_
#define NET_PROXY_PROXY_LIST_H_
#include <string>
#include <vector>
#include "net/base/net_export.h"
#include "net/base/net_log.h"
#include "net/proxy/proxy_retry_info.h"
namespace net {
class ProxyServer;
// This class is used to hold a list of proxies returned by GetProxyForUrl or
// manually configured. It handles proxy fallback if multiple servers are
// specified.
class NET_EXPORT_PRIVATE ProxyList {
public:
ProxyList();
~ProxyList();
// Initializes the proxy list to a string containing one or more proxy servers
// delimited by a semicolon.
void Set(const std::string& proxy_uri_list);
// Set the proxy list to a single entry, |proxy_server|.
void SetSingleProxyServer(const ProxyServer& proxy_server);
// De-prioritizes the proxies that we have cached as not working, by moving
// them to the end of the fallback list.
void DeprioritizeBadProxies(const ProxyRetryInfoMap& proxy_retry_info);
// Returns true if this proxy list contains at least one proxy that is
// not currently present in |proxy_retry_info|.
bool HasUntriedProxies(const ProxyRetryInfoMap& proxy_retry_info) const;
// Delete any entry which doesn't have one of the specified proxy schemes.
// |scheme_bit_field| is a bunch of ProxyServer::Scheme bitwise ORed together.
void RemoveProxiesWithoutScheme(int scheme_bit_field);
// Clear the proxy list.
void Clear();
// Returns true if there is nothing left in the ProxyList.
bool IsEmpty() const;
// Returns the number of proxy servers in this list.
size_t size() const;
// Returns the first proxy server in the list. It is only valid to call
// this if !IsEmpty().
const ProxyServer& Get() const;
// Sets the list by parsing the pac result |pac_string|.
// Some examples for |pac_string|:
// "DIRECT"
// "PROXY foopy1"
// "PROXY foopy1; SOCKS4 foopy2:1188"
// Does a best-effort parse, and silently discards any errors.
void SetFromPacString(const std::string& pac_string);
// Returns a PAC-style semicolon-separated list of valid proxy servers.
// For example: "PROXY xxx.xxx.xxx.xxx:xx; SOCKS yyy.yyy.yyy:yy".
std::string ToPacString() const;
// Marks the current proxy server as bad and deletes it from the list. The
// list of known bad proxies is given by proxy_retry_info. Returns true if
// there is another server available in the list.
bool Fallback(ProxyRetryInfoMap* proxy_retry_info,
const BoundNetLog& net_log);
// Updates |proxy_retry_info| to indicate that the first proxy in the list
// is bad. This is distinct from Fallback(), above, to allow updating proxy
// retry information without modifying a given transction's proxy list.
void UpdateRetryInfoOnFallback(ProxyRetryInfoMap* proxy_retry_info,
const BoundNetLog& net_log) const;
private:
// List of proxies.
std::vector<ProxyServer> proxies_;
};
} // namespace net
#endif // NET_PROXY_PROXY_LIST_H_
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