private void ProcessOnePack(ParsedReceivePack receivePack, GitExecutionResult result)
{
next.PostPackReceive(receivePack, result);
var packFilePath = recoveryFilePathBuilder.GetPathToPackFile(receivePack);
if (File.Exists(packFilePath))
{
File.Delete(packFilePath);
}
}
public void PrePackReceive(ParsedReceivePack receivePack)
{
File.WriteAllText(recoveryFilePathBuilder.GetPathToPackFile(receivePack), JsonConvert.SerializeObject(receivePack));
next.PrePackReceive(receivePack);
}
public void PostPackReceive(ParsedReceivePack receivePack, GitExecutionResult result)
{
ProcessOnePack(receivePack, result);
RecoverAll();
}
public void ExecuteServiceByName(string correlationId, string repositoryName, string serviceName, ExecutionOptions options, System.IO.Stream inStream, System.IO.Stream outStream)
{
ParsedReceivePack receivedPack = null;
if (serviceName == "receive-pack" && inStream.Length > 0)
{
// PARSING RECEIVE-PACK THAT IS OF THE FOLLOWING FORMAT:
// (NEW LINES added for ease of reading)
// (LLLL is length of the line (expressed in HEX) until next LLLL value)
//
// LLLL------ REF LINE -----------\0------- OHTER DATA -----------
// LLLL------ REF LINE ----------------
// ...
// ...
// 0000PACK------- REST OF PACKAGE --------
//
var pktLines = new List<ReceivePackPktLine>();
var buff1 = new byte[1];
var buff4 = new byte[4];
var buff20 = new byte[20];
var buff16K = new byte[1024 * 16];
while (true)
{
ReadStream(inStream, buff4);
var len = Convert.ToInt32(Encoding.UTF8.GetString(buff4), 16);
if (len == 0)
{
break;
}
len = len - buff4.Length;
var accum = new LinkedList<byte>();
while (len > 0)
{
len -= 1;
ReadStream(inStream, buff1);
if (buff1[0] == 0)
{
break;
}
accum.AddLast(buff1[0]);
}
if (len > 0)
{
inStream.Seek(len, SeekOrigin.Current);
}
var pktLine = Encoding.UTF8.GetString(accum.ToArray());
var pktLineItems = pktLine.Split(' ');
var fromCommit = pktLineItems[0];
var toCommit = pktLineItems[1];
var refName = pktLineItems[2];
pktLines.Add(new ReceivePackPktLine(fromCommit, toCommit, refName));
}
// parse PACK contents
var packCommits = new List<ReceivePackCommit>();
// PACK format
// https://www.kernel.org/pub/software/scm/git/docs/technical/pack-format.html
// http://schacon.github.io/gitbook/7_the_packfile.html
if (inStream.Position < inStream.Length)
{
ReadStream(inStream, buff4);
if (Encoding.UTF8.GetString(buff4) != "PACK")
{
throw new Exception("Unexpected receive-pack 'PACK' content.");
}
ReadStream(inStream, buff4);
Array.Reverse(buff4);
var versionNum = BitConverter.ToInt32(buff4, 0);
ReadStream(inStream, buff4);
Array.Reverse(buff4);
var numObjects = BitConverter.ToInt32(buff4, 0);
while (numObjects > 0)
{
numObjects -= 1;
ReadStream(inStream, buff1);
var type = (GIT_OBJ_TYPE)((buff1[0] >> 4) & 7);
long len = buff1[0] & 15;
var shiftAmount = 4;
while ((buff1[0] >> 7) == 1)
{
ReadStream(inStream, buff1);
len = len | ((long)(buff1[0] & 127) << shiftAmount);
shiftAmount += 7;
}
if (type == GIT_OBJ_TYPE.OBJ_REF_DELTA)
{
// read ref name
ReadStream(inStream, buff20);
}
if (type == GIT_OBJ_TYPE.OBJ_OFS_DELTA)
{
// read negative offset
ReadStream(inStream, buff1);
while ((buff1[0] >> 7) == 1)
{
ReadStream(inStream, buff1);
}
}
var origPosition = inStream.Position;
long offsetVal = 0;
using (var zlibStream = new ZlibStream(inStream, CompressionMode.Decompress, true))
{
// read compressed data max 16KB at a time
var readRemaining = len;
do
{
var bytesUncompressed = zlibStream.Read(buff16K, 0, buff16K.Length);
readRemaining -= bytesUncompressed;
} while (readRemaining > 0);
if (type == GIT_OBJ_TYPE.OBJ_COMMIT)
{
var parsedCommit = ParseCommitDetails(buff16K, len);
packCommits.Add(parsedCommit);
}
offsetVal = zlibStream.TotalIn;
}
// move back position a bit because ZLibStream reads more than needed for inflating
inStream.Seek(origPosition + offsetVal, SeekOrigin.Begin);
}
}
// -------------------
var user = HttpContext.Current.User.Id();
receivedPack = new ParsedReceivePack(correlationId, repositoryName, pktLines, user, DateTime.Now, packCommits);
inStream.Seek(0, SeekOrigin.Begin);
receivePackHandler.PrePackReceive(receivedPack);
}
GitExecutionResult execResult = null;
using (var capturedOutputStream = new MemoryStream())
{
gitService.ExecuteServiceByName(correlationId, repositoryName, serviceName, options, inStream, new ReplicatingStream(outStream, capturedOutputStream));
// parse captured output
capturedOutputStream.Seek(0, SeekOrigin.Begin);
execResult = resultParser.ParseResult(capturedOutputStream);
}
if(receivedPack != null)
{
receivePackHandler.PostPackReceive(receivedPack, execResult);
}
}