src/jobs.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2022 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         "bytes"
  22         "fmt"
  23         "io"
  24         "os"
  25         "path/filepath"
  26         "strings"
  27
  28         xdr "github.com/davecgh/go-xdr/xdr2"
  29         "github.com/dustin/go-humanize"
  30 )
  31
  32 type TRxTx string
  33
  34 const (
  35         TRx TRxTx = "rx"
  36         TTx TRxTx = "tx"
  37
  38         HdrDir = "hdr"
  39 )
  40
  41 type Job struct {
  42         PktEnc   *PktEnc
  43         Path     string
  44         Size     int64
  45         HshValue *[MTHSize]byte
  46 }
  47
  48 func JobPath2Hdr(jobPath string) string {
  49         return filepath.Join(filepath.Dir(jobPath), HdrDir, filepath.Base(jobPath))
  50 }
  51
  52 func (ctx *Ctx) HdrRead(r io.Reader) (*PktEnc, []byte, error) {
  53         var pktEnc PktEnc
  54         _, err := xdr.Unmarshal(r, &pktEnc)
  55         if err != nil {
  56                 return nil, nil, err
  57         }
  58         var raw bytes.Buffer
  59         if _, err = xdr.Marshal(&raw, pktEnc); err != nil {
  60                 panic(err)
  61         }
  62         return &pktEnc, raw.Bytes(), nil
  63 }
  64
  65 func (ctx *Ctx) HdrWrite(pktEncRaw []byte, tgt string) error {
  66         tmpHdr, err := ctx.NewTmpFile()
  67         if err != nil {
  68                 ctx.LogE("hdr-write-tmp-new", nil, err, func(les LEs) string {
  69                         return "Header writing: new temporary file"
  70                 })
  71                 return err
  72         }
  73         if _, err = tmpHdr.Write(pktEncRaw); err != nil {
  74                 ctx.LogE("hdr-write-write", nil, err, func(les LEs) string {
  75                         return "Header writing: writing"
  76                 })
  77                 os.Remove(tmpHdr.Name())
  78                 return err
  79         }
  80         if err = tmpHdr.Close(); err != nil {
  81                 ctx.LogE("hdr-write-close", nil, err, func(les LEs) string {
  82                         return "Header writing: closing"
  83                 })
  84                 os.Remove(tmpHdr.Name())
  85                 return err
  86         }
  87         if err = ensureDir(filepath.Dir(tgt), HdrDir); err != nil {
  88                 ctx.LogE("hdr-write-ensure-mkdir", nil, err, func(les LEs) string {
  89                         return "Header writing: ensuring directory"
  90                 })
  91                 return err
  92         }
  93         if err = os.Rename(tmpHdr.Name(), JobPath2Hdr(tgt)); err != nil {
  94                 ctx.LogE("hdr-write-rename", nil, err, func(les LEs) string {
  95                         return "Header writing: renaming"
  96                 })
  97                 return err
  98         }
  99         return err
 100 }
 101
 102 func (ctx *Ctx) jobsFind(nodeId *NodeId, xx TRxTx, nock, part bool) chan Job {
 103         rxPath := filepath.Join(ctx.Spool, nodeId.String(), string(xx))
 104         jobs := make(chan Job, 16)
 105         go func() {
 106                 defer close(jobs)
 107                 dir, err := os.Open(rxPath)
 108                 if err != nil {
 109                         return
 110                 }
 111                 fis, err := dir.Readdir(0)
 112                 dir.Close()
 113                 if err != nil {
 114                         return
 115                 }
 116                 for _, fi := range fis {
 117                         name := fi.Name()
 118                         var hshValue []byte
 119                         if nock {
 120                                 if !strings.HasSuffix(name, NoCKSuffix) ||
 121                                         len(name) != Base32Encoded32Len+len(NoCKSuffix) {
 122                                         continue
 123                                 }
 124                                 hshValue, err = Base32Codec.DecodeString(
 125                                         strings.TrimSuffix(name, NoCKSuffix),
 126                                 )
 127                         } else if part {
 128                                 if !strings.HasSuffix(name, PartSuffix) ||
 129                                         len(name) != Base32Encoded32Len+len(PartSuffix) {
 130                                         continue
 131                                 }
 132                                 hshValue, err = Base32Codec.DecodeString(
 133                                         strings.TrimSuffix(name, PartSuffix),
 134                                 )
 135                         } else {
 136                                 if len(name) != Base32Encoded32Len {
 137                                         continue
 138                                 }
 139                                 hshValue, err = Base32Codec.DecodeString(name)
 140                         }
 141                         if err != nil {
 142                                 continue
 143                         }
 144                         pth := filepath.Join(rxPath, name)
 145                         hdrExists := true
 146                         var fd *os.File
 147                         if nock || part {
 148                                 fd, err = os.Open(pth)
 149                         } else {
 150                                 fd, err = os.Open(JobPath2Hdr(pth))
 151                                 if err != nil && os.IsNotExist(err) {
 152                                         hdrExists = false
 153                                         fd, err = os.Open(pth)
 154                                 }
 155                         }
 156                         if err != nil {
 157                                 continue
 158                         }
 159                         if part {
 160                                 job := Job{
 161                                         Path:     pth,
 162                                         Size:     fi.Size(),
 163                                         HshValue: new([MTHSize]byte),
 164                                 }
 165                                 copy(job.HshValue[:], hshValue)
 166                                 jobs <- job
 167                                 continue
 168                         }
 169                         pktEnc, pktEncRaw, err := ctx.HdrRead(fd)
 170                         fd.Close()
 171                         if err != nil {
 172                                 continue
 173                         }
 174                         switch pktEnc.Magic {
 175                         case MagicNNCPEv1.B:
 176                                 err = MagicNNCPEv1.TooOld()
 177                         case MagicNNCPEv2.B:
 178                                 err = MagicNNCPEv2.TooOld()
 179                         case MagicNNCPEv3.B:
 180                                 err = MagicNNCPEv3.TooOld()
 181                         case MagicNNCPEv4.B:
 182                                 err = MagicNNCPEv4.TooOld()
 183                         case MagicNNCPEv5.B:
 184                                 err = MagicNNCPEv5.TooOld()
 185                         case MagicNNCPEv6.B:
 186                         default:
 187                                 err = BadMagic
 188                         }
 189                         if err != nil {
 190                                 ctx.LogE("job", LEs{
 191                                         {"XX", string(xx)},
 192                                         {"Name", name},
 193                                         {"Size", fi.Size()},
 194                                 }, err, func(les LEs) string {
 195                                         return fmt.Sprintf(
 196                                                 "Job %s/%s size: %s",
 197                                                 string(xx), name,
 198                                                 humanize.IBytes(uint64(fi.Size())),
 199                                         )
 200                                 })
 201                                 continue
 202                         }
 203                         ctx.LogD("job", LEs{
 204                                 {"XX", string(xx)},
 205                                 {"Node", pktEnc.Sender},
 206                                 {"Name", name},
 207                                 {"Nice", int(pktEnc.Nice)},
 208                                 {"Size", fi.Size()},
 209                         }, func(les LEs) string {
 210                                 return fmt.Sprintf(
 211                                         "Job %s/%s/%s nice: %s size: %s",
 212                                         pktEnc.Sender, string(xx), name,
 213                                         NicenessFmt(pktEnc.Nice),
 214                                         humanize.IBytes(uint64(fi.Size())),
 215                                 )
 216                         })
 217                         if !hdrExists && ctx.HdrUsage {
 218                                 ctx.HdrWrite(pktEncRaw, pth)
 219                         }
 220                         job := Job{
 221                                 PktEnc:   pktEnc,
 222                                 Path:     pth,
 223                                 Size:     fi.Size(),
 224                                 HshValue: new([MTHSize]byte),
 225                         }
 226                         copy(job.HshValue[:], hshValue)
 227                         jobs <- job
 228                 }
 229         }()
 230         return jobs
 231 }
 232
 233 func (ctx *Ctx) Jobs(nodeId *NodeId, xx TRxTx) chan Job {
 234         return ctx.jobsFind(nodeId, xx, false, false)
 235 }
 236
 237 func (ctx *Ctx) JobsNoCK(nodeId *NodeId) chan Job {
 238         return ctx.jobsFind(nodeId, TRx, true, false)
 239 }
 240
 241 func (ctx *Ctx) JobsPart(nodeId *NodeId) chan Job {
 242         return ctx.jobsFind(nodeId, TRx, false, true)
 243 }