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