net/proxy/proxy_list.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_PROXY_PROXY_LIST_H_
   6 #define NET_PROXY_PROXY_LIST_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "net/base/net_export.h"
  12 #include "net/base/net_log.h"
  13 #include "net/proxy/proxy_retry_info.h"
  14
  15 namespace base {
  16 class ListValue;
  17 class TimeDelta;
  18 }
  19
  20 namespace net {
  21
  22 class ProxyServer;
  23
  24 // This class is used to hold a list of proxies returned by GetProxyForUrl or
  25 // manually configured. It handles proxy fallback if multiple servers are
  26 // specified.
  27 class NET_EXPORT_PRIVATE ProxyList {
  28  public:
  29   ProxyList();
  30   ~ProxyList();
  31
  32   // Initializes the proxy list to a string containing one or more proxy servers
  33   // delimited by a semicolon.
  34   void Set(const std::string& proxy_uri_list);
  35
  36   // Set the proxy list to a single entry, |proxy_server|.
  37   void SetSingleProxyServer(const ProxyServer& proxy_server);
  38
  39   // Append a single proxy server to the end of the proxy list.
  40   void AddProxyServer(const ProxyServer& proxy_server);
  41
  42   // De-prioritizes the proxies that are cached as not working but are allowed
  43   // to be reconsidered, by moving them to the end of the fallback list.
  44   void DeprioritizeBadProxies(const ProxyRetryInfoMap& proxy_retry_info);
  45
  46   // Delete any entry which doesn't have one of the specified proxy schemes.
  47   // |scheme_bit_field| is a bunch of ProxyServer::Scheme bitwise ORed together.
  48   void RemoveProxiesWithoutScheme(int scheme_bit_field);
  49
  50   // Clear the proxy list.
  51   void Clear();
  52
  53   // Returns true if there is nothing left in the ProxyList.
  54   bool IsEmpty() const;
  55
  56   // Returns the number of proxy servers in this list.
  57   size_t size() const;
  58
  59   // Returns true if |*this| lists the same proxies as |other|.
  60   bool Equals(const ProxyList& other) const;
  61
  62   // Returns the first proxy server in the list. It is only valid to call
  63   // this if !IsEmpty().
  64   const ProxyServer& Get() const;
  65
  66   // Sets the list by parsing the pac result |pac_string|.
  67   // Some examples for |pac_string|:
  68   //   "DIRECT"
  69   //   "PROXY foopy1"
  70   //   "PROXY foopy1; SOCKS4 foopy2:1188"
  71   // Does a best-effort parse, and silently discards any errors.
  72   void SetFromPacString(const std::string& pac_string);
  73
  74   // Returns a PAC-style semicolon-separated list of valid proxy servers.
  75   // For example: "PROXY xxx.xxx.xxx.xxx:xx; SOCKS yyy.yyy.yyy:yy".
  76   std::string ToPacString() const;
  77
  78   // Returns a serialized value for the list. The caller takes ownership of it.
  79   base::ListValue* ToValue() const;
  80
  81   // Marks the current proxy server as bad and deletes it from the list. The
  82   // list of known bad proxies is given by |proxy_retry_info|. |net_error|
  83   // should contain the network error encountered when this proxy was tried, if
  84   // any. If this fallback is not because of a network error, then |OK| should
  85   // be passed in (eg. for reasons such as local policy). Returns true if there
  86   // is another server available in the list.
  87   bool Fallback(ProxyRetryInfoMap* proxy_retry_info,
  88                 int net_error,
  89                 const BoundNetLog& net_log);
  90
  91   // Updates |proxy_retry_info| to indicate that the first proxy in the list
  92   // is bad. This is distinct from Fallback(), above, to allow updating proxy
  93   // retry information without modifying a given transction's proxy list. Will
  94   // retry after |retry_delay| if positive, and will use the default proxy retry
  95   // duration otherwise. It may reconsider the proxy beforehand if |reconsider|
  96   // is true. Additionally updates |proxy_retry_info| with
  97   // |another_proxy_to_bypass| if non-empty. |net_error| should contain the
  98   // network error countered when this proxy was tried, or OK if the proxy retry
  99   // info is being updated for a non-network related reason (e.g. local policy).
 100   void UpdateRetryInfoOnFallback(
 101       ProxyRetryInfoMap* proxy_retry_info,
 102       base::TimeDelta retry_delay,
 103       bool reconsider,
 104       const ProxyServer& another_proxy_to_bypass,
 105       int net_error,
 106       const BoundNetLog& net_log) const;
 107
 108  private:
 109   // Updates |proxy_retry_info| to indicate that the |proxy_to_retry| in
 110   // |proxies_| is bad for |retry_delay|, but may be reconsidered earlier if
 111   // |try_while_bad| is true. |net_error| should contain the network error
 112   // countered when this proxy was tried, or OK if the proxy retry info is
 113   // being updated for a non-network related reason (e.g. local policy).
 114   void AddProxyToRetryList(ProxyRetryInfoMap* proxy_retry_info,
 115                            base::TimeDelta retry_delay,
 116                            bool try_while_bad,
 117                            const ProxyServer& proxy_to_retry,
 118                            int net_error,
 119                            const BoundNetLog& net_log) const;
 120
 121   // List of proxies.
 122   std::vector<ProxyServer> proxies_;
 123 };
 124
 125 }  // namespace net
 126
 127 #endif  // NET_PROXY_PROXY_LIST_H_