refactor http client implementation

No effective behavior change, just shuffling big junks of code between
methods and classes to split them into those strongly related to our
client implementation and those implementing HTTP.

The idea is to get HTTPS to a point in which most of the implementation
can be shared even though the client implementations itself is
completely different. This isn't anywhere near yet though, but it should
beenough to reuse at least a few lines from http in https now.

Git-Dch: Ignore

1 files changed, 142 insertions, 0 deletions

diff --git a/methods/server.h b/methods/server.h
new file mode 100644
index 000000000..2d43b332f
--- /dev/null
+++ b/methods/server.h
@@ -0,0 +1,142 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/* ######################################################################
+
+   Classes dealing with the abstraction of talking to a end via a text
+   protocol like HTTP (which is used by the http and https methods)
+
+   ##################################################################### */
+									/*}}}*/
+
+#ifndef APT_SERVER_H
+#define APT_SERVER_H
+
+#include <apt-pkg/strutl.h>
+
+#include <string>
+
+using std::cout;
+using std::endl;
+
+class Hashes;
+class ServerMethod;
+class FileFd;
+
+struct ServerState
+{
+   // This is the last parsed Header Line
+   unsigned int Major;
+   unsigned int Minor;
+   unsigned int Result;
+   char Code[360];
+
+   // These are some statistics from the last parsed header lines
+   unsigned long long Size;
+   signed long long StartPos;
+   time_t Date;
+   bool HaveContent;
+   enum {Chunked,Stream,Closes} Encoding;
+   enum {Header, Data} State;
+   bool Persistent;
+   std::string Location;
+
+   // This is a Persistent attribute of the server itself.
+   bool Pipeline;
+   URI ServerName;
+   URI Proxy;
+   unsigned long TimeOut;
+
+   protected:
+   ServerMethod *Owner;
+
+   bool HeaderLine(std::string Line);
+   virtual bool ReadHeaderLines(std::string &Data) = 0;
+   virtual bool LoadNextResponse(bool const ToFile, FileFd * const File) = 0;
+
+   public:
+   /** \brief Result of the header acquire */
+   enum RunHeadersResult {
+      /** \brief Header ok */
+      RUN_HEADERS_OK,
+      /** \brief IO error while retrieving */
+      RUN_HEADERS_IO_ERROR,
+      /** \brief Parse error after retrieving */
+      RUN_HEADERS_PARSE_ERROR,
+   };
+   /** \brief Get the headers before the data */
+   RunHeadersResult RunHeaders(FileFd * const File);
+
+   bool Comp(URI Other) const {return Other.Host == ServerName.Host && Other.Port == ServerName.Port;};
+   virtual void Reset() {Major = 0; Minor = 0; Result = 0; Code[0] = '\0'; Size = 0;
+		 StartPos = 0; Encoding = Closes; time(&Date); HaveContent = false;
+		 State = Header; Persistent = false; Pipeline = true;};
+   virtual bool WriteResponse(std::string const &Data) = 0;
+
+   /** \brief Transfer the data from the socket */
+   virtual bool RunData(FileFd * const File) = 0;
+
+   virtual bool Open() = 0;
+   virtual bool IsOpen() = 0;
+   virtual bool Close() = 0;
+   virtual bool InitHashes(FileFd &File) = 0;
+   virtual Hashes * GetHashes() = 0;
+   virtual bool Die(FileFd &File) = 0;
+   virtual bool Flush(FileFd * const File) = 0;
+   virtual bool Go(bool ToFile, FileFd * const File) = 0;
+
+   ServerState(URI Srv, ServerMethod *Owner);
+   virtual ~ServerState() {};
+};
+
+class ServerMethod : public pkgAcqMethod
+{
+   protected:
+   virtual bool Fetch(FetchItem *);
+
+   ServerState *Server;
+   std::string NextURI;
+   FileFd *File;
+
+   unsigned long PipelineDepth;
+   bool AllowRedirect;
+
+   public:
+   bool Debug;
+
+   /** \brief Result of the header parsing */
+   enum DealWithHeadersResult {
+      /** \brief The file is open and ready */
+      FILE_IS_OPEN,
+      /** \brief We got a IMS hit, the file has not changed */
+      IMS_HIT,
+      /** \brief The server reported a unrecoverable error */
+      ERROR_UNRECOVERABLE,
+      /** \brief The server reported a error with a error content page */
+      ERROR_WITH_CONTENT_PAGE,
+      /** \brief An error on the client side */
+      ERROR_NOT_FROM_SERVER,
+      /** \brief A redirect or retry request */
+      TRY_AGAIN_OR_REDIRECT
+   };
+   /** \brief Handle the retrieved header data */
+   DealWithHeadersResult DealWithHeaders(FetchResult &Res);
+
+   // In the event of a fatal signal this file will be closed and timestamped.
+   static std::string FailFile;
+   static int FailFd;
+   static time_t FailTime;
+   static void SigTerm(int);
+
+   virtual bool Configuration(std::string Message);
+   virtual bool Flush() { return Server->Flush(File); };
+
+   int Loop();
+
+   virtual void SendReq(FetchItem *Itm) = 0;
+   virtual ServerState * CreateServerState(URI uri) = 0;
+
+   ServerMethod(const char *Ver,unsigned long Flags = 0) : pkgAcqMethod(Ver, Flags), PipelineDepth(0), AllowRedirect(false), Debug(false) {};
+   virtual ~ServerMethod() {};
+};
+
+#endif