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using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using LibGit2Sharp.Core;
namespace LibGit2Sharp
{
/// <summary>
/// An enumeration of the type of connections which a "smart" subtransport
/// may be asked to create on behalf of libgit2.
/// </summary>
public enum GitSmartSubtransportAction
{
/// <summary>
/// For HTTP, this indicates a GET to /info/refs?service=git-upload-pack
/// </summary>
UploadPackList = 1,
/// <summary>
/// For HTTP, this indicates a POST to /git-upload-pack
/// </summary>
UploadPack = 2,
/// <summary>
/// For HTTP, this indicates a GET to /info/refs?service=git-receive-pack
/// </summary>
ReceivePackList = 3,
/// <summary>
/// For HTTP, this indicates a POST to /git-receive-pack
/// </summary>
ReceivePack = 4
}
/// <summary>
/// Base class for custom RPC-based subtransports that use the standard
/// "smart" git protocol. RPC-based subtransports perform work over
/// multiple requests, like the http transport.
/// </summary>
public abstract class RpcSmartSubtransport : SmartSubtransport
{
}
/// <summary>
/// Base class for typical custom subtransports for the "smart"
/// transport that work over a single connection, like the git and ssh
/// transports.
/// </summary>
public abstract class SmartSubtransport
{
/// <summary>
/// Invoked by libgit2 to create a connection using this subtransport.
/// </summary>
/// <param name="url">The endpoint to connect to</param>
/// <param name="action">The type of connection to create</param>
/// <returns>A SmartSubtransportStream representing the connection</returns>
protected abstract SmartSubtransportStream Action(String url, GitSmartSubtransportAction action);
/// <summary>
/// Invoked by libgit2 when this subtransport is no longer needed, but may be re-used in the future.
/// Override this method to add additional cleanup steps to your subclass. Be sure to call base.Close().
/// </summary>
protected virtual void Close()
{
}
/// <summary>
/// Invoked by libgit2 when this subtransport is being freed. Override this method to add additional
/// cleanup steps to your subclass. Be sure to call base.Dispose().
/// </summary>
protected virtual void Dispose()
{
Close();
if (IntPtr.Zero != nativeSubtransportPointer)
{
GCHandle.FromIntPtr(Marshal.ReadIntPtr(nativeSubtransportPointer, GitSmartSubtransport.GCHandleOffset)).Free();
Marshal.FreeHGlobal(nativeSubtransportPointer);
nativeSubtransportPointer = IntPtr.Zero;
}
}
private IntPtr nativeSubtransportPointer;
internal IntPtr GitSmartSubtransportPointer
{
get
{
if (IntPtr.Zero == nativeSubtransportPointer)
{
var nativeTransport = new GitSmartSubtransport();
nativeTransport.Action = EntryPoints.ActionCallback;
nativeTransport.Close = EntryPoints.CloseCallback;
nativeTransport.Free = EntryPoints.FreeCallback;
nativeTransport.GCHandle = GCHandle.ToIntPtr(GCHandle.Alloc(this));
nativeSubtransportPointer = Marshal.AllocHGlobal(Marshal.SizeOf(nativeTransport));
Marshal.StructureToPtr(nativeTransport, nativeSubtransportPointer, false);
}
return nativeSubtransportPointer;
}
}
private static class EntryPoints
{
// Because our GitSmartSubtransport structure exists on the managed heap only for a short time (to be marshaled
// to native memory with StructureToPtr), we need to bind to static delegates. If at construction time
// we were to bind to the methods directly, that's the same as newing up a fresh delegate every time.
// Those delegates won't be rooted in the object graph and can be collected as soon as StructureToPtr finishes.
public static GitSmartSubtransport.action_callback ActionCallback = new GitSmartSubtransport.action_callback(Action);
public static GitSmartSubtransport.close_callback CloseCallback = new GitSmartSubtransport.close_callback(Close);
public static GitSmartSubtransport.free_callback FreeCallback = new GitSmartSubtransport.free_callback(Free);
private static int Action(
out IntPtr stream,
IntPtr subtransport,
IntPtr url,
GitSmartSubtransportAction action)
{
stream = IntPtr.Zero;
SmartSubtransport t = GCHandle.FromIntPtr(Marshal.ReadIntPtr(subtransport, GitSmartSubtransport.GCHandleOffset)).Target as SmartSubtransport;
String urlAsString = LaxUtf8Marshaler.FromNative(url);
if (null != t &&
!String.IsNullOrEmpty(urlAsString))
{
try
{
stream = t.Action(urlAsString, action).GitSmartTransportStreamPointer;
return 0;
}
catch (Exception ex)
{
Proxy.giterr_set_str(GitErrorCategory.Net, ex);
}
}
return (int)GitErrorCode.Error;
}
private static int Close(IntPtr subtransport)
{
SmartSubtransport t = GCHandle.FromIntPtr(Marshal.ReadIntPtr(subtransport, GitSmartSubtransport.GCHandleOffset)).Target as SmartSubtransport;
if (null != t)
{
try
{
t.Close();
return 0;
}
catch (Exception ex)
{
Proxy.giterr_set_str(GitErrorCategory.Net, ex);
}
}
return (int)GitErrorCode.Error;
}
private static void Free(IntPtr subtransport)
{
SmartSubtransport t = GCHandle.FromIntPtr(Marshal.ReadIntPtr(subtransport, GitSmartSubtransport.GCHandleOffset)).Target as SmartSubtransport;
if (null != t)
{
try
{
t.Dispose();
}
catch (Exception ex)
{
Proxy.giterr_set_str(GitErrorCategory.Net, ex);
}
}
}
}
}
}
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