src/cypherpunks.ru/nncp/jobs.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2019 Sergey Matveev <stargrave@stargrave.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 package nncp
  20
  21 import (
  22         "io"
  23         "os"
  24         "path/filepath"
  25         "strconv"
  26
  27         "github.com/davecgh/go-xdr/xdr2"
  28 )
  29
  30 type TRxTx string
  31
  32 const (
  33         TRx TRxTx = "rx"
  34         TTx TRxTx = "tx"
  35 )
  36
  37 type Job struct {
  38         PktEnc   *PktEnc
  39         Fd       *os.File
  40         Size     int64
  41         HshValue *[32]byte
  42 }
  43
  44 func (ctx *Ctx) Jobs(nodeId *NodeId, xx TRxTx) chan Job {
  45         rxPath := filepath.Join(ctx.Spool, nodeId.String(), string(xx))
  46         jobs := make(chan Job, 16)
  47         go func() {
  48                 defer close(jobs)
  49                 dir, err := os.Open(rxPath)
  50                 if err != nil {
  51                         return
  52                 }
  53                 fis, err := dir.Readdir(0)
  54                 dir.Close()
  55                 if err != nil {
  56                         return
  57                 }
  58                 for _, fi := range fis {
  59                         hshValue, err := FromBase32(fi.Name())
  60                         if err != nil {
  61                                 continue
  62                         }
  63                         fd, err := os.Open(filepath.Join(rxPath, fi.Name()))
  64                         if err != nil {
  65                                 continue
  66                         }
  67                         var pktEnc PktEnc
  68                         if _, err = xdr.Unmarshal(fd, &pktEnc); err != nil || pktEnc.Magic != MagicNNCPEv4 {
  69                                 fd.Close()
  70                                 continue
  71                         }
  72                         fd.Seek(0, io.SeekStart)
  73                         ctx.LogD("jobs", SDS{
  74                                 "xx":   string(xx),
  75                                 "node": pktEnc.Sender,
  76                                 "name": fi.Name(),
  77                                 "nice": strconv.Itoa(int(pktEnc.Nice)),
  78                                 "size": strconv.FormatInt(fi.Size(), 10),
  79                         }, "taken")
  80                         job := Job{
  81                                 PktEnc:   &pktEnc,
  82                                 Fd:       fd,
  83                                 Size:     fi.Size(),
  84                                 HshValue: new([32]byte),
  85                         }
  86                         copy(job.HshValue[:], hshValue)
  87                         jobs <- job
  88                 }
  89         }()
  90         return jobs
  91 }