methods/http.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/// $Id: http.h,v 1.12 2002/04/18 05:09:38 jgg Exp $
   3 // $Id: http.h,v 1.12 2002/04/18 05:09:38 jgg Exp $
   4 /* ######################################################################
   5
   6    HTTP Acquire Method - This is the HTTP aquire method for APT.
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10
  11 #ifndef APT_HTTP_H
  12 #define APT_HTTP_H
  13
  14 #define MAXLEN 360
  15
  16
  17
  18 using std::cout;
  19 using std::endl;
  20
  21 class HttpMethod;
  22
  23 class CircleBuf
  24 {
  25    unsigned char *Buf;
  26    unsigned long Size;
  27    unsigned long InP;
  28    unsigned long OutP;
  29    string OutQueue;
  30    unsigned long StrPos;
  31    unsigned long MaxGet;
  32    struct timeval Start;
  33
  34    static unsigned long BwReadLimit;
  35    static unsigned long BwTickReadData;
  36    static struct timeval BwReadTick;
  37    static const unsigned int BW_HZ;
  38
  39    unsigned long LeftRead()
  40    {
  41       unsigned long Sz = Size - (InP - OutP);
  42       if (Sz > Size - (InP%Size))
  43          Sz = Size - (InP%Size);
  44       return Sz;
  45    }
  46    unsigned long LeftWrite()
  47    {
  48       unsigned long Sz = InP - OutP;
  49       if (InP > MaxGet)
  50          Sz = MaxGet - OutP;
  51       if (Sz > Size - (OutP%Size))
  52          Sz = Size - (OutP%Size);
  53       return Sz;
  54    }
  55    void FillOut();
  56
  57    public:
  58
  59    Hashes *Hash;
  60
  61    // Read data in
  62    bool Read(int Fd);
  63    bool Read(string Data);
  64
  65    // Write data out
  66    bool Write(int Fd);
  67    bool WriteTillEl(string &Data,bool Single = false);
  68
  69    // Control the write limit
  70    void Limit(long Max) {if (Max == -1) MaxGet = 0-1; else MaxGet = OutP + Max;}
  71    bool IsLimit() {return MaxGet == OutP;};
  72    void Print() {cout << MaxGet << ',' << OutP << endl;};
  73
  74    // Test for free space in the buffer
  75    bool ReadSpace() {return Size - (InP - OutP) > 0;};
  76    bool WriteSpace() {return InP - OutP > 0;};
  77
  78    // Dump everything
  79    void Reset();
  80    void Stats();
  81
  82    CircleBuf(unsigned long Size);
  83    ~CircleBuf() {delete [] Buf; delete Hash;};
  84 };
  85
  86 struct ServerState
  87 {
  88    // This is the last parsed Header Line
  89    unsigned int Major;
  90    unsigned int Minor;
  91    unsigned int Result;
  92    char Code[MAXLEN];
  93
  94    // These are some statistics from the last parsed header lines
  95    unsigned long Size;
  96    signed long StartPos;
  97    time_t Date;
  98    bool HaveContent;
  99    enum {Chunked,Stream,Closes} Encoding;
 100    enum {Header, Data} State;
 101    bool Persistent;
 102
 103    // This is a Persistent attribute of the server itself.
 104    bool Pipeline;
 105
 106    HttpMethod *Owner;
 107
 108    // This is the connection itself. Output is data FROM the server
 109    CircleBuf In;
 110    CircleBuf Out;
 111    int ServerFd;
 112    URI ServerName;
 113
 114    bool HeaderLine(string Line);
 115    bool Comp(URI Other) {return Other.Host == ServerName.Host && Other.Port == ServerName.Port;};
 116    void Reset() {Major = 0; Minor = 0; Result = 0; Size = 0; StartPos = 0;
 117                  Encoding = Closes; time(&Date); ServerFd = -1;
 118                  Pipeline = true;};
 119    int RunHeaders();
 120    bool RunData();
 121
 122    bool Open();
 123    bool Close();
 124
 125    ServerState(URI Srv,HttpMethod *Owner);
 126    ~ServerState() {Close();};
 127 };
 128
 129 class HttpMethod : public pkgAcqMethod
 130 {
 131    void SendReq(FetchItem *Itm,CircleBuf &Out);
 132    bool Go(bool ToFile,ServerState *Srv);
 133    bool Flush(ServerState *Srv);
 134    bool ServerDie(ServerState *Srv);
 135    int DealWithHeaders(FetchResult &Res,ServerState *Srv);
 136
 137    virtual bool Configuration(string Message);
 138
 139    // In the event of a fatal signal this file will be closed and timestamped.
 140    static string FailFile;
 141    static int FailFd;
 142    static time_t FailTime;
 143    static void SigTerm(int);
 144
 145    protected:
 146    virtual bool Fetch(FetchItem *);
 147
 148    public:
 149    friend class ServerState;
 150
 151    FileFd *File;
 152    ServerState *Server;
 153
 154    int Loop();
 155
 156    HttpMethod() : pkgAcqMethod("1.2",Pipeline | SendConfig)
 157    {
 158       File = 0;
 159       Server = 0;
 160    };
 161 };
 162
 163 #endif