mirror of https://github.com/BOINC/boinc.git
128 lines
4.2 KiB
C++
128 lines
4.2 KiB
C++
// Berkeley Open Infrastructure for Network Computing
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// http://boinc.berkeley.edu
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// Copyright (C) 2005 University of California
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//
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// This is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation;
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// either version 2.1 of the License, or (at your option) any later version.
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//
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// This software is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU Lesser General Public License for more details.
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//
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// To view the GNU Lesser General Public License visit
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// http://www.gnu.org/copyleft/lesser.html
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// or write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#ifndef _PERS_FILE_XFER_H
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#define _PERS_FILE_XFER_H
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#include "client_types.h"
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#include "file_xfer.h"
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// PERS_FILE_XFER represents a "persistent file transfer",
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// i.e. a long-term effort to upload or download a file.
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// This may consist of several "episodes",
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// which are HTTP operations to a particular server.
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//
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// The FILE_INFO has a list of URLs.
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// For download, the object attempts to download the file
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// from any of the URLs.
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// If one fails or is not available, try another,
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// using an exponential backoff policy to avoid flooding servers.
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//
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// For upload, try to upload the file to the first URL;
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// if that fails try the others.
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// a PERS_FILE_XFER is created and added to pers_file_xfer_set
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// 1) when read from the client state file
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// in (FILE_INFO::parse(), CLIENT_STATE::parse_state_file()
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// 2) when a FILE_INFO is ready to transfer
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// in CLIENT_STATE::handle_pers_file_xfers()
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// a PERS_FILE_XFER p is removed from pers_file_xfer_set and freed
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// 1) when p->pers_xfer_done is true
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// in CLIENT_STATE::handle_pers_file_xfers()
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// A FILE_XFER is created and added to file_xfer_set and linked from PFX
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// 1) in PERS_FILE_XFER::start_xfer()
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// A FILE_XFER is erased from file_xfer_set, unlinked from PFX and freed
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// 1) when the FILE_XFER is done, in
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// PERS_FILE_XFER::poll()
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// PERS_FILE_XFER::check_giveup()
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// 2) user request, in
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// PERS_FILE_XFER::abort()
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// PERS_FILE_XFER::suspend()
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// 3) if the FILE_XFER_SET::insert() fails
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// PERS_FILE_XFER::start_xfer()
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// NOTE: when this is done, pers_xfer_done is set
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//
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// pointers:
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// PERS_FILE_XFER -> FILE_XFER
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// set in PERS_FILE_XFER::start_xfer()
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// zeroed (see above)
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// PERS_FILE_XFER -> FILE_INFO
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// set in PERS_FILE_XFER::init()
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// FILE_INFO -> PERS_FILE_XFER
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// set in FILE_INFO::parse(), CLIENT_STATE::handle_pers_file_xfers()
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// zeroed in PERS_FILE_XFER destructor
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// Default values for exponential backoff
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#define PERS_RETRY_DELAY_MIN 60 // 1 minute
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#define PERS_RETRY_DELAY_MAX (60*60*4) // 4 hours
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#define PERS_GIVEUP (60*60*24*7*2) // 2 weeks
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// give up on xfer if this time elapses since last byte xferred
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class PERS_FILE_XFER {
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int nretry; // # of retries so far
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double first_request_time; // time of first transfer request
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void do_backoff();
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public:
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bool is_upload;
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double next_request_time; // time to next retry the file request
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double time_so_far;
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// Total time there's been an active FILE_XFER for this PFX
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// Currently not used for anything; not meaningful for throughput
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// because could include repeated transfer
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double last_time;
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// when the above was last updated.
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// Defined only while a transfer is active
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bool pers_xfer_done;
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FILE_XFER* fxp; // nonzero if file xfer in progress
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FILE_INFO* fip;
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PERS_FILE_XFER();
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~PERS_FILE_XFER();
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int init(FILE_INFO*, bool is_file_upload);
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bool poll();
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void handle_xfer_failure();
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void retry_or_backoff();
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void check_giveup(const char*);
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void abort();
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int write(MIOFILE& fout);
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int parse(MIOFILE& fin);
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int start_xfer();
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void suspend();
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};
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class PERS_FILE_XFER_SET {
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FILE_XFER_SET* file_xfers;
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public:
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std::vector<PERS_FILE_XFER*>pers_file_xfers;
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PERS_FILE_XFER_SET(FILE_XFER_SET*);
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int insert(PERS_FILE_XFER*);
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int remove(PERS_FILE_XFER*);
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bool poll();
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void suspend();
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};
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#endif
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