methods/server.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* ######################################################################
   4
   5    Classes dealing with the abstraction of talking to a end via a text
   6    protocol like HTTP (which is used by the http and https methods)
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10
  11 #ifndef APT_SERVER_H
  12 #define APT_SERVER_H
  13
  14 #include <apt-pkg/strutl.h>
  15
  16 #include <string>
  17
  18 using std::cout;
  19 using std::endl;
  20
  21 class Hashes;
  22 class ServerMethod;
  23 class FileFd;
  24
  25 struct ServerState
  26 {
  27    // This is the last parsed Header Line
  28    unsigned int Major;
  29    unsigned int Minor;
  30    unsigned int Result;
  31    char Code[360];
  32
  33    // These are some statistics from the last parsed header lines
  34    unsigned long long Size;
  35    signed long long StartPos;
  36    time_t Date;
  37    bool HaveContent;
  38    enum {Chunked,Stream,Closes} Encoding;
  39    enum {Header, Data} State;
  40    bool Persistent;
  41    std::string Location;
  42
  43    // This is a Persistent attribute of the server itself.
  44    bool Pipeline;
  45    URI ServerName;
  46    URI Proxy;
  47    unsigned long TimeOut;
  48
  49    protected:
  50    ServerMethod *Owner;
  51
  52    virtual bool ReadHeaderLines(std::string &Data) = 0;
  53    virtual bool LoadNextResponse(bool const ToFile, FileFd * const File) = 0;
  54
  55    public:
  56    bool HeaderLine(std::string Line);
  57
  58    /** \brief Result of the header acquire */
  59    enum RunHeadersResult {
  60       /** \brief Header ok */
  61       RUN_HEADERS_OK,
  62       /** \brief IO error while retrieving */
  63       RUN_HEADERS_IO_ERROR,
  64       /** \brief Parse error after retrieving */
  65       RUN_HEADERS_PARSE_ERROR,
  66    };
  67    /** \brief Get the headers before the data */
  68    RunHeadersResult RunHeaders(FileFd * const File);
  69
  70    bool Comp(URI Other) const {return Other.Host == ServerName.Host && Other.Port == ServerName.Port;};
  71    virtual void Reset() {Major = 0; Minor = 0; Result = 0; Code[0] = '\0'; Size = 0;
  72                  StartPos = 0; Encoding = Closes; time(&Date); HaveContent = false;
  73                  State = Header; Persistent = false; Pipeline = true;};
  74    virtual bool WriteResponse(std::string const &Data) = 0;
  75
  76    /** \brief Transfer the data from the socket */
  77    virtual bool RunData(FileFd * const File) = 0;
  78
  79    virtual bool Open() = 0;
  80    virtual bool IsOpen() = 0;
  81    virtual bool Close() = 0;
  82    virtual bool InitHashes(FileFd &File) = 0;
  83    virtual Hashes * GetHashes() = 0;
  84    virtual bool Die(FileFd &File) = 0;
  85    virtual bool Flush(FileFd * const File) = 0;
  86    virtual bool Go(bool ToFile, FileFd * const File) = 0;
  87
  88    ServerState(URI Srv, ServerMethod *Owner);
  89    virtual ~ServerState() {};
  90 };
  91
  92 class ServerMethod : public pkgAcqMethod
  93 {
  94    protected:
  95    virtual bool Fetch(FetchItem *);
  96
  97    ServerState *Server;
  98    std::string NextURI;
  99    FileFd *File;
 100
 101    unsigned long PipelineDepth;
 102    bool AllowRedirect;
 103
 104    public:
 105    bool Debug;
 106
 107    /** \brief Result of the header parsing */
 108    enum DealWithHeadersResult {
 109       /** \brief The file is open and ready */
 110       FILE_IS_OPEN,
 111       /** \brief We got a IMS hit, the file has not changed */
 112       IMS_HIT,
 113       /** \brief The server reported a unrecoverable error */
 114       ERROR_UNRECOVERABLE,
 115       /** \brief The server reported a error with a error content page */
 116       ERROR_WITH_CONTENT_PAGE,
 117       /** \brief An error on the client side */
 118       ERROR_NOT_FROM_SERVER,
 119       /** \brief A redirect or retry request */
 120       TRY_AGAIN_OR_REDIRECT
 121    };
 122    /** \brief Handle the retrieved header data */
 123    DealWithHeadersResult DealWithHeaders(FetchResult &Res);
 124
 125    // In the event of a fatal signal this file will be closed and timestamped.
 126    static std::string FailFile;
 127    static int FailFd;
 128    static time_t FailTime;
 129    static void SigTerm(int);
 130
 131    virtual bool Configuration(std::string Message);
 132    virtual bool Flush() { return Server->Flush(File); };
 133
 134    int Loop();
 135
 136    virtual void SendReq(FetchItem *Itm) = 0;
 137    virtual ServerState * CreateServerState(URI uri) = 0;
 138    virtual void RotateDNS() = 0;
 139
 140    ServerMethod(const char *Ver,unsigned long Flags = 0) : pkgAcqMethod(Ver, Flags), Server(NULL), File(NULL), PipelineDepth(0), AllowRedirect(false), Debug(false) {};
 141    virtual ~ServerMethod() {};
 142 };
 143
 144 #endif