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// -*- 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 "aptmethod.h"
#include <time.h>
#include <iostream>
#include <string>
#include <memory>
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
// total size of the usable content (aka: the file)
unsigned long long TotalFileSize;
// size we actually download (can be smaller than Size if we have partial content)
unsigned long long DownloadSize;
// size of junk content (aka: server error pages)
unsigned long long JunkSize;
// The start of the data (for partial content)
unsigned long long StartPos;
time_t Date;
bool HaveContent;
enum {Chunked,Stream,Closes} Encoding;
enum {Header, Data} State;
bool Persistent;
bool PipelineAllowed;
std::string Location;
// This is a Persistent attribute of the server itself.
bool Pipeline;
URI ServerName;
URI Proxy;
unsigned long TimeOut;
unsigned long long MaximumSize;
protected:
ServerMethod *Owner;
virtual bool ReadHeaderLines(std::string &Data) = 0;
virtual bool LoadNextResponse(bool const ToFile, FileFd * const File) = 0;
public:
bool HeaderLine(std::string Line);
/** \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, const std::string &Uri);
bool AddPartialFileToHashes(FileFd &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'; TotalFileSize = 0; JunkSize = 0;
StartPos = 0; Encoding = Closes; time(&Date); HaveContent = false;
State = Header; Persistent = false; Pipeline = false; MaximumSize = 0; PipelineAllowed = 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 RunDataToDevNull() = 0;
virtual bool Open() = 0;
virtual bool IsOpen() = 0;
virtual bool Close() = 0;
virtual bool InitHashes(HashStringList const &ExpectedHashes) = 0;
virtual Hashes * GetHashes() = 0;
virtual bool Die(FileFd * const 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 aptMethod
{
protected:
virtual bool Fetch(FetchItem *) APT_OVERRIDE;
std::unique_ptr<ServerState> Server;
std::string NextURI;
FileFd *File;
unsigned long PipelineDepth;
bool AllowRedirect;
// Find the biggest item in the fetch queue for the checking of the maximum
// size
unsigned long long FindMaximumObjectSizeInQueue() const APT_PURE;
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 */
virtual 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 APT_NORETURN void SigTerm(int);
virtual bool Flush() { return Server->Flush(File); };
int Loop();
virtual void SendReq(FetchItem *Itm) = 0;
virtual std::unique_ptr<ServerState> CreateServerState(URI const &uri) = 0;
virtual void RotateDNS() = 0;
ServerMethod(char const * const Binary, char const * const Ver,unsigned long const Flags);
virtual ~ServerMethod() {};
};
#endif
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