src/cypherpunks.ru/nncp/cmd/nncp-caller/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2017 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 // Croned NNCP TCP daemon caller
  20 package main
  21
  22 import (
  23         "flag"
  24         "fmt"
  25         "io/ioutil"
  26         "log"
  27         "os"
  28         "strconv"
  29         "sync"
  30         "time"
  31
  32         "cypherpunks.ru/nncp"
  33 )
  34
  35 func usage() {
  36         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  37         fmt.Fprintln(os.Stderr, "nncp-caller -- croned NNCP TCP daemon caller\n")
  38         fmt.Fprintf(os.Stderr, "Usage: %s [options] [NODE ...]\n", os.Args[0])
  39         fmt.Fprintln(os.Stderr, "Options:")
  40         flag.PrintDefaults()
  41 }
  42
  43 func main() {
  44         var (
  45                 cfgPath  = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
  46                 quiet    = flag.Bool("quiet", false, "Print only errors")
  47                 debug    = flag.Bool("debug", false, "Print debug messages")
  48                 version  = flag.Bool("version", false, "Print version information")
  49                 warranty = flag.Bool("warranty", false, "Print warranty information")
  50         )
  51         flag.Usage = usage
  52         flag.Parse()
  53         if *warranty {
  54                 fmt.Println(nncp.Warranty)
  55                 return
  56         }
  57         if *version {
  58                 fmt.Println(nncp.VersionGet())
  59                 return
  60         }
  61
  62         cfgRaw, err := ioutil.ReadFile(nncp.CfgPathFromEnv(cfgPath))
  63         if err != nil {
  64                 log.Fatalln("Can not read config:", err)
  65         }
  66         ctx, err := nncp.CfgParse(cfgRaw)
  67         if err != nil {
  68                 log.Fatalln("Can not parse config:", err)
  69         }
  70         ctx.Quiet = *quiet
  71         ctx.Debug = *debug
  72
  73         var nodes []*nncp.Node
  74         if flag.NArg() > 0 {
  75                 for _, nodeId := range flag.Args() {
  76                         node, err := ctx.FindNode(nodeId)
  77                         if err != nil {
  78                                 log.Fatalln("Invalid NODE specified:", err)
  79                         }
  80                         if len(node.Calls) == 0 {
  81                                 ctx.LogD("caller", nncp.SDS{"node": node.Id}, "has no calls, skipping")
  82                                 continue
  83                         }
  84                         nodes = append(nodes, node)
  85                 }
  86         } else {
  87                 for _, node := range ctx.Neigh {
  88                         if len(node.Calls) == 0 {
  89                                 ctx.LogD("caller", nncp.SDS{"node": node.Id}, "has no calls, skipping")
  90                                 continue
  91                         }
  92                         nodes = append(nodes, node)
  93                 }
  94         }
  95
  96         var wg sync.WaitGroup
  97         for _, node := range nodes {
  98                 for i, call := range node.Calls {
  99                         wg.Add(1)
 100                         go func(node *nncp.Node, i int, call *nncp.Call) {
 101                                 defer wg.Done()
 102                                 var addrs []string
 103                                 if call.Addr == nil {
 104                                         for _, addr := range node.Addrs {
 105                                                 addrs = append(addrs, addr)
 106                                         }
 107                                 } else {
 108                                         addrs = append(addrs, *call.Addr)
 109                                 }
 110                                 sds := nncp.SDS{"node": node.Id, "callindex": strconv.Itoa(i)}
 111                                 for {
 112                                         n := time.Now()
 113                                         t := call.Cron.Next(n)
 114                                         ctx.LogD("caller", sds, t.String())
 115                                         if t.IsZero() {
 116                                                 ctx.LogE("caller", sds, "got zero time")
 117                                                 return
 118                                         }
 119                                         time.Sleep(t.Sub(n))
 120                                         node.Lock()
 121                                         if node.Busy {
 122                                                 node.Unlock()
 123                                                 ctx.LogD("caller", sds, "busy")
 124                                                 continue
 125                                         } else {
 126                                                 node.Busy = true
 127                                                 node.Unlock()
 128                                                 ctx.CallNode(node, addrs, call.Nice, call.Xx, call.OnlineDeadline)
 129                                                 node.Lock()
 130                                                 node.Busy = false
 131                                                 node.Unlock()
 132                                         }
 133                                 }
 134                         }(node, i, call)
 135                 }
 136         }
 137         wg.Wait()
 138 }