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TWebFile.h
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1 // @(#)root/net:$Id$
2 // Author: Fons Rademakers 17/01/97
3 
4 /*************************************************************************
5  * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
6  * All rights reserved. *
7  * *
8  * For the licensing terms see $ROOTSYS/LICENSE. *
9  * For the list of contributors see $ROOTSYS/README/CREDITS. *
10  *************************************************************************/
11 
12 #ifndef ROOT_TWebFile
13 #define ROOT_TWebFile
14 
15 
16 //////////////////////////////////////////////////////////////////////////
17 // //
18 // TWebFile //
19 // //
20 // A TWebFile is like a normal TFile except that it reads its data //
21 // via a standard apache web server. A TWebFile is a read-only file. //
22 // //
23 //////////////////////////////////////////////////////////////////////////
24 
25 #include "TFile.h"
26 #include "TUrl.h"
27 #include "TSystem.h"
28 
29 class TSocket;
30 class TWebSocket;
31 
32 
33 class TWebFile : public TFile {
34 
35 friend class TWebSocket;
36 friend class TWebSystem;
37 
38 private:
39  TWebFile() : fSocket(0) { }
40 
41 protected:
42  mutable Long64_t fSize; // file size
43  TSocket *fSocket; // socket for HTTP/1.1 (stays alive between calls)
44  TUrl fProxy; // proxy URL
45  Bool_t fHasModRoot; // true if server has mod_root installed
46  Bool_t fHTTP11; // true if server support HTTP/1.1
47  Bool_t fNoProxy; // don't use proxy
48  TString fMsgReadBuffer; // cache ReadBuffer() msg
49  TString fMsgReadBuffer10; // cache ReadBuffer10() msg
50  TString fMsgGetHead; // cache GetHead() msg
51  TString fBasicUrl; // basic url without authentication and options
52  TUrl fUrlOrg; // save original url in case of temp redirection
53  TString fBasicUrlOrg; // save original url in case of temp redirection
54  void *fFullCache; //! complete content of the file, some http server may return complete content
55  Long64_t fFullCacheSize; //! size of the cached content
56 
57  static TUrl fgProxy; // globally set proxy URL
58  static Long64_t fgMaxFullCacheSize; // maximal size of full-cached content, 500 MB by default
59 
60  virtual void Init(Bool_t readHeadOnly);
61  virtual void CheckProxy();
62  virtual TString BasicAuthentication();
63  virtual Int_t GetHead();
64  virtual Int_t GetLine(TSocket *s, char *line, Int_t maxsize);
65  virtual Int_t GetHunk(TSocket *s, char *hunk, Int_t maxsize);
66  virtual const char *HttpTerminator(const char *start, const char *peeked, Int_t peeklen);
67  virtual Int_t GetFromWeb(char *buf, Int_t len, const TString &msg);
68  virtual Int_t GetFromWeb10(char *buf, Int_t len, const TString &msg, Int_t nseg = 0, Long64_t *seg_pos = 0, Int_t *seg_len = 0);
69  virtual Int_t GetFromCache(char *buf, Int_t len, Int_t nseg, Long64_t *seg_pos, Int_t *seg_len);
70  virtual Bool_t ReadBuffer10(char *buf, Int_t len);
71  virtual Bool_t ReadBuffers10(char *buf, Long64_t *pos, Int_t *len, Int_t nbuf);
72  virtual void SetMsgReadBuffer10(const char *redirectLocation = 0, Bool_t tempRedirect = kFALSE);
73  virtual void ProcessHttpHeader(const TString& headerLine);
74 
75 public:
76  TWebFile(const char *url, Option_t *opt="");
77  TWebFile(TUrl url, Option_t *opt="");
78  virtual ~TWebFile();
79 
80  virtual Long64_t GetSize() const;
81  virtual Bool_t IsOpen() const;
82  virtual Int_t ReOpen(Option_t *mode);
83  virtual Bool_t ReadBuffer(char *buf, Int_t len);
84  virtual Bool_t ReadBuffer(char *buf, Long64_t pos, Int_t len);
85  virtual Bool_t ReadBuffers(char *buf, Long64_t *pos, Int_t *len, Int_t nbuf);
86  virtual void Seek(Long64_t offset, ERelativeTo pos = kBeg);
87 
88  static void SetProxy(const char *url);
89  static const char *GetProxy();
90 
91  static Long64_t GetMaxFullCacheSize();
92  static void SetMaxFullCacheSize(Long64_t sz);
93 
94  ClassDef(TWebFile,2) //A ROOT file that reads via a http server
95 };
96 
97 
98 class TWebSystem : public TSystem {
99 
100 private:
101  void *fDirp; // directory handler
102 
103  void *GetDirPtr() const { return fDirp; }
104 
105 public:
106  TWebSystem();
107  virtual ~TWebSystem() { }
108 
109  Int_t MakeDirectory(const char *name);
110  void *OpenDirectory(const char *name);
111  void FreeDirectory(void *dirp);
112  const char *GetDirEntry(void *dirp);
113  Int_t GetPathInfo(const char *path, FileStat_t &buf);
114  Bool_t AccessPathName(const char *path, EAccessMode mode);
115  Int_t Unlink(const char *path);
116 
117  ClassDef(TWebSystem,0) // Directory handler for HTTP (TWebFiles)
118 };
119 
120 #endif