Copyright 1997-2003 John D. Polstra.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed by John D. Polstra.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
MODULE RegularUpdater;
IMPORT
CVProto, ErrMsg, FileAttr, FileRd, FileStatus, FileUpdater,
Logger, OSError, Pathname, Rd, RdCopy, Receive, SupFileRec,
SupMisc, Thread, TokScan, Wr;
REVEAL
T = Public BRANDED OBJECT
pos: CARDINAL;
attr: FileAttr.T;
OVERRIDES
init := Init;
update := Update;
END;
PROCEDURE Init(self: T;
pos: CARDINAL;
attr: FileAttr.T): T =
BEGIN
self.pos := pos;
self.attr := attr;
RETURN self;
END Init;
PROCEDURE Update(self: T;
sfr: SupFileRec.T;
name: Pathname.T;
<*UNUSED*> toAttic: BOOLEAN;
<*UNUSED*> proto: CVProto.T;
trace: Logger.T;
protoRd: Rd.T;
wr: Wr.T;
VAR status: FileUpdater.Status)
RAISES {FileUpdater.FixupNeeded, Rd.EndOfFile, Rd.Failure,
Thread.Alerted, TokScan.Error, Wr.Failure} =
VAR
srcPath := SupMisc.CatPath(sfr.clientPrefix, name);
oldAttr: FileAttr.T;
rd: Rd.T;
srcSize: CARDINAL := 0;
errMsg: TEXT := NIL;
wantSum: TEXT;
newSize := FileAttr.GetSize(self.attr);
BEGIN
(* First, copy the existing file, unless we're replacing it. *)
TRY
oldAttr := FileAttr.FromPathname(srcPath, follow := FALSE);
self.attr := FileAttr.Merge(self.attr, oldAttr);
IF newSize = self.pos THEN
VAR
msg: TEXT;
BEGIN
status.updateType := FileUpdater.UpdateType.Touch;
IF FileAttr.Equal(self.attr,
FileAttr.MaskOut(oldAttr, FileAttr.AllButModTime)) THEN
msg := " SetAttrs ";
ELSE
msg := " Touch ";
END;
msg := msg & name;
Logger.Notice(trace, msg);
END;
ELSIF self.pos = 0 THEN
Logger.Notice(trace, " Replace " & name);
status.updateType := FileUpdater.UpdateType.Replace;
ELSE
Logger.Notice(trace, " Append to " & name);
status.updateType := FileUpdater.UpdateType.Append;
END;
IF self.pos # 0 THEN
rd := FileRd.Open(srcPath);
TRY
srcSize := RdCopy.ToWriter(rd, wr, self.pos);
IF srcSize = self.pos AND NOT Rd.EOF(rd) THEN
(* We are appending to an existing file, but it got longer on
the client. *)
INC(srcSize);
END;
FINALLY
Rd.Close(rd);
END;
END;
EXCEPT
| OSError.E(l) =>
errMsg := "Cannot open: " & ErrMsg.StrError(l);
| Rd.Failure(l) =>
errMsg := "Read failure: " & ErrMsg.StrError(l);
END;
(* Append any data from the server. *)
TRY
wantSum := Receive.Counted(protoRd, wr, newSize - self.pos,
withChecksum := TRUE);
EXCEPT Receive.Error(msg) =>
RAISE FileUpdater.FixupNeeded(msg);
END;
IF errMsg # NIL THEN
RAISE FileUpdater.FixupNeeded(errMsg);
END;
IF srcSize > self.pos THEN
RAISE FileUpdater.FixupNeeded("File grew on client");
ELSIF srcSize < self.pos THEN
RAISE FileUpdater.FixupNeeded("File shrank on client");
END;
status.fs := NEW(FileStatus.T,
name := name,
clientAttr := self.attr,
serverAttr := self.attr,
type := FileStatus.Type.FileLive);
status.fromAttic := FALSE;
status.modified := newSize # self.pos;
status.wantSum := wantSum;
END Update;
BEGIN
END RegularUpdater.