public override List <AdapterMessage> ProcessMessage(AdapterMessage message)
{
List <AdapterMessage> list = null;
try
{
Tracer.WriteBegin();
NodeParams p = NodeParams.Extract(message);
if (p.Operation == FileOperationValues.Write)
{
WriteFile(message, p);
}
else if (p.Operation == FileOperationValues.Read)
{
list = ReadFiles(message, p, FileShare.Read);
}
else if (p.Operation == FileOperationValues.ReadAndDelete)
{
list = ReadFiles(message, p, FileShare.None);
}
else // FileOperationValues.None
{
Tracer.WriteLine("File Operation set to 'None', so no action is done.");
}
}
finally
{
Tracer.WriteEnd();
}
return(list);
}
private void WriteFile(AdapterMessage message, NodeParams p)
{
lock (this)
{
string filepath = Path.Combine(p.Path, p.Filename);
FileMode fileMode = FileMode.Create;
if (p.AppendToExisting)
{
fileMode = FileMode.Append;
}
// Create directory if it does not exist. This enables paths like 'c:\temp\%date%'
if (Directory.Exists(p.Path) == false)
{
Directory.CreateDirectory(p.Path);
}
using (FileStream fs = new FileStream(filepath, fileMode, FileAccess.Write, FileShare.None))
{
// Seek to the end of the file in case we're appending to existing data
fs.Seek(0, SeekOrigin.End);
if (message.IsString)
{
using (StreamWriter sw = new StreamWriter(fs))
{
sw.Write(message.GetDataAsString());
}
}
else
{
byte[] buffer = message.GetDataAsArray();
fs.Write(buffer, 0, buffer.Length);
}
}
// Preserve the creation time of source if it is configured to do so and we're not appending
if (p.PreserveCreationTime && fileMode != FileMode.Append)
{
string creationTime = message.Parameters.GetValueAsString("CreationTime");
if (creationTime != null)
{
try
{
DateTime time = DateTime.Parse(creationTime);
System.IO.File.SetCreationTime(filepath, time);
}
catch (Exception ex)
{
// Just skip if not possible
Tracer.WriteException(ex);
}
}
}
}
}
private List <AdapterMessage> ReadFiles(AdapterMessage original, NodeParams p, FileShare fileShare)
{
List <AdapterMessage> list = new List <AdapterMessage>();
using (FileSystemEnumerator fse = new FileSystemEnumerator(p.Path, p.Filename, false))
{
foreach (FileInfo fi in fse.Matches())
{
if (fi == null)
{
continue;
}
AdapterMessage msg = null;
if (!string.IsNullOrEmpty(p.FileMissingResponse) && !File.Exists(fi.FullName))
{
Tracer.WriteLine($"File '{fi.FullName}' is MISSING, \r\nsetting response content to: '{p.FileMissingResponse}'");
msg = AdapterMessageFactory.CreateResponseMessage(original, p.FileMissingResponse);
}
else if (!string.IsNullOrEmpty(p.EmptyFileResponse) && new FileInfo(fi.FullName).Length == 0)
{
Tracer.WriteLine($"File '{fi.FullName}' is EMPTY, \r\nsetting response content to: {p.EmptyFileResponse}");
msg = AdapterMessageFactory.CreateResponseMessage(original, p.EmptyFileResponse);
}
else
{
Tracer.WriteLine($"Reading file from: '{fi.FullName}'");
byte[] data = System.IO.File.ReadAllBytes(fi.FullName);
msg = AdapterMessageFactory.CreateResponseMessage(original, data);
AddExpandableMessageParams(msg, fi);
}
if (p.Operation == FileOperationValues.ReadAndDelete && !fi.IsReadOnly)
{
DeleteFile(fi.FullName);
}
list.Add(msg);
}
}
return(list);
}