Serial number processing
[hcoop/domtool2.git] / src / plugins / bind.sml
index 41bc1d8..9a05dce 100644 (file)
@@ -116,6 +116,34 @@ fun readLine inf =
 
 fun readILine inf = valOf (Int.fromString (readLine inf))
 
+val monthToInt = fn Date.Jan => 1
+                 | Date.Feb => 2
+                 | Date.Mar => 3
+                 | Date.Apr => 4
+                 | Date.May => 5
+                 | Date.Jun => 6
+                 | Date.Jul => 7
+                 | Date.Aug => 8
+                 | Date.Sep => 9
+                 | Date.Oct => 10
+                 | Date.Nov => 11
+                 | Date.Dec => 12
+
+fun padBy ch amt s =
+    if size s < amt then
+       CharVector.tabulate (amt, fn _ => ch) ^ s
+    else
+       s
+
+fun dateString () =
+    let
+       val date = Date.fromTimeUniv (Time.now ())
+    in
+       padBy #"0" 4 (Int.toString (Date.year date))
+       ^ padBy #"0" 2 (Int.toString (monthToInt (Date.month date)))
+       ^ padBy #"0" 2 (Int.toString (Date.day date))
+    end
+
 val () = Slave.registerFileHandler (fn fs =>
                                       let
                                           val {dir, file} = OS.Path.splitDirFile (#file fs)
@@ -149,6 +177,39 @@ val () = Slave.registerFileHandler (fn fs =>
                                                       val min = readILine inf
                                                       val () = TextIO.closeIn inf
 
+                                                      val oldSerial = let
+                                                          val inf = TextIO.openIn (OS.Path.joinDirFile {dir = #dir fs,
+                                                                                                        file = "serial"})
+                                                      in
+                                                          SOME (readLine inf)
+                                                          before TextIO.closeIn inf
+                                                      end handle IO.Io _ => NONE
+
+                                                      val newSerial =
+                                                          case serial of
+                                                              SOME n => Int.toString n
+                                                            | NONE =>
+                                                              let
+                                                                  val prefix = dateString ()
+                                                              in
+                                                                  prefix
+                                                                  ^ (case oldSerial of
+                                                                         NONE => "00"
+                                                                       | SOME old =>
+                                                                         if size old >= 8 andalso
+                                                                            String.substring (old, 0, 8) = prefix then
+                                                                             case Int.fromString (String.extract (old, 8, NONE)) of
+                                                                                 NONE => "00"
+                                                                               | SOME old => padBy #"0" 2 (Int.toString (old+1))
+                                                                         else
+                                                                             "00")
+                                                              end
+
+                                                      val outf = TextIO.openOut (OS.Path.joinDirFile {dir = #dir fs,
+                                                                                                      file = "serial"})
+                                                      val _ = TextIO.output (outf, newSerial)
+                                                      val _ = TextIO.closeOut outf
+
                                                       val dns = OS.Path.joinDirFile {dir = #dir fs,
                                                                                      file = "dns"}
 
@@ -167,7 +228,7 @@ val () = Slave.registerFileHandler (fn fs =>
                                                       TextIO.output (outf, ".\thostmaster.");
                                                       TextIO.output (outf, #domain fs);
                                                       TextIO.output (outf, ". ( ");
-                                                      TextIO.output (outf, Int.toString 123456789);
+                                                      TextIO.output (outf, newSerial);
                                                       TextIO.output (outf, " ");
                                                       TextIO.output (outf, Int.toString rf);
                                                       TextIO.output (outf, " ");