XrdOssCsiConfig.hh

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#ifndef _XRDOSSCSICONFIG_H
#define _XRDOSSCSICONFIG_H
/******************************************************************************/
/*                                                                            */
/*                   X r d O s s C s i C o n f i g . h h                      */
/*                                                                            */
/* (C) Copyright 2021 CERN.                                                   */
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/* This file is part of the XRootD software suite.                            */
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/* XRootD is free software: you can redistribute it and/or modify it under    */
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#include "XrdOss/XrdOss.hh"
#include "XrdOuc/XrdOucStream.hh"
#include "XrdOuc/XrdOucEnv.hh"
#include "XrdSys/XrdSysLogger.hh"
 
#include <string>
 
class TagPath
{
public:
 
   TagPath() : prefix_("/.xrdt"), suffix_(".xrdt") { calcPrefixElements(); }
   ~TagPath() { }
 
   //
   // path may be absolute or last element from a directory listing
   bool isTagFile(const char *path)
   {
      if (!path || !*path) return false;
      std::string s(path);
      simplePath(s);
      // if prefix_ set, the test is to match if "path" is equal to or a subpath of perfix_
      if (!prefix_.empty())
      {
         if (s.find(prefix_) == 0)
         {
            if (prefix_.length() == s.length()) return true;
            if (s[prefix_.length()] == '/') return true;
         }
         return false;
      }
      // prefix_ not set, test is if "path" ends with suffix_
      const size_t haystack = s.length();
      const size_t needle = suffix_.length();
      if (haystack >= needle && s.substr(haystack-needle, std::string::npos) == suffix_) return true;
      return false;
   }
 
   int SetPrefix(XrdSysError &Eroute, const std::string &v)
   { 
      if (!v.empty() && v[0] != '/')
      {
         Eroute.Emsg("Config","prefix must be empty or start with /");
         return 1;
      }
      prefix_ = v;
      calcPrefixElements();
      return XrdOssOK;
   }
 
   bool hasPrefix() { return !prefix_.empty(); }
 
   // 
   // to convert an absolute data directory to corresponding tag directory
   std::string makeBaseDirname(const char *path)
   {
      if (!path || *path != '/' || prefix_.empty()) return std::string();
      std::string p(path);
      simplePath(p);
      if (p.length()>1) return prefix_ + p;
      return prefix_;
   }
 
   //
   // test if absolute path is the directory containing the
   // base directory of the tags
   bool matchPrefixDir(const char *path)
   {
      if (!path || *path != '/' || prefix_.empty()) return false;
      std::string p(path);
      simplePath(p);
      if (prefixstart_ == p) return true;
      return false;
   }
 
   // the name (not path) of directory containing the tags
   std::string getPrefixName()
   {
      return prefixend_;
   }
 
   // take datafile name at absolute path and convert it to filename of tagfile
   std::string makeTagFilename(const char *path)
   {
      if (!path || *path != '/') return std::string();
      std::string p(path);
      simplePath(p);
      return prefix_ + p + suffix_;
   }
 
   std::string prefix_;
 
private:
   void calcPrefixElements()
   {
      prefixstart_.clear();
      prefixend_.clear();
      if (prefix_.empty()) return;
      simplePath(prefix_);
      const size_t idx = prefix_.rfind("/");
      prefixstart_ = prefix_.substr(0,idx);
      if (prefixstart_.empty()) prefixstart_ = std::string("/");
      prefixend_ = prefix_.substr(idx+1,std::string::npos);
   }
 
   void simplePath(std::string &str)
   {
      // replace double slashes with single
      size_t i=0;
      do {
         i = str.find("//", i);
         if (i == std::string::npos) break;
         str.erase(i, 1);      
      } while (!str.empty());
 
      // remove trailing /
      if (str.length()>1 && str[str.length()-1] == '/')
      {
         str.erase( str.end()-1 );
      }
   }
 
   std::string prefixstart_;
   std::string prefixend_;
   std::string suffix_;
};
 
class XrdOssCsiConfig
{
public:
 
  XrdOssCsiConfig() : fillFileHole_(true), xrdtSpaceName_("public"), allowMissingTags_(true), disablePgExtend_(false), disableLooseWrite_(false) { }
  ~XrdOssCsiConfig() { }
 
  int Init(XrdSysError &, const char *, const char *, XrdOucEnv *);
 
  bool fillFileHole() const { return fillFileHole_; }
 
  std::string xrdtSpaceName() const { return xrdtSpaceName_; }
 
  bool allowMissingTags() const { return allowMissingTags_; }
 
  bool disablePgExtend() const { return disablePgExtend_; }
 
  bool disableLooseWrite() const { return disableLooseWrite_; }
 
  TagPath tagParam_;
 
private:
  int readConfig(XrdSysError &, const char *);
 
  int ConfigXeq(char *, XrdOucStream &, XrdSysError &);
 
  int xtrace(XrdOucStream &, XrdSysError &);
 
  bool fillFileHole_;
  std::string xrdtSpaceName_;
  bool allowMissingTags_;
  bool disablePgExtend_;
  bool disableLooseWrite_;
};
 
#endif