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#region Copyright notice and license
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion
using System;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using Grpc.Core.Profiling;
namespace Grpc.Core.Internal
{
/// <summary>
/// grpc_metadata_array from <c>grpc/grpc.h</c>
/// </summary>
internal class MetadataArraySafeHandle : SafeHandleZeroIsInvalid
{
static readonly NativeMethods Native = NativeMethods.Get();
private MetadataArraySafeHandle()
{
}
public static MetadataArraySafeHandle Create(Metadata metadata)
{
if (metadata.Count == 0)
{
return new MetadataArraySafeHandle();
}
// TODO(jtattermusch): we might wanna check that the metadata is readonly
var metadataArray = Native.grpcsharp_metadata_array_create(new UIntPtr((ulong)metadata.Count));
for (int i = 0; i < metadata.Count; i++)
{
var valueBytes = metadata[i].GetSerializedValueUnsafe();
Native.grpcsharp_metadata_array_add(metadataArray, metadata[i].Key, valueBytes, new UIntPtr((ulong)valueBytes.Length));
}
return metadataArray;
}
/// <summary>
/// Reads metadata from pointer to grpc_metadata_array
/// </summary>
public static Metadata ReadMetadataFromPtrUnsafe(IntPtr metadataArray)
{
if (metadataArray == IntPtr.Zero)
{
return null;
}
ulong count = Native.grpcsharp_metadata_array_count(metadataArray).ToUInt64();
var metadata = new Metadata();
for (ulong i = 0; i < count; i++)
{
var index = new UIntPtr(i);
UIntPtr keyLen;
IntPtr keyPtr = Native.grpcsharp_metadata_array_get_key(metadataArray, index, out keyLen);
string key = Marshal.PtrToStringAnsi(keyPtr, (int)keyLen.ToUInt32());
UIntPtr valueLen;
IntPtr valuePtr = Native.grpcsharp_metadata_array_get_value(metadataArray, index, out valueLen);
var bytes = new byte[valueLen.ToUInt64()];
Marshal.Copy(valuePtr, bytes, 0, bytes.Length);
metadata.Add(Metadata.Entry.CreateUnsafe(key, bytes));
}
return metadata;
}
internal IntPtr Handle
{
get
{
return handle;
}
}
protected override bool ReleaseHandle()
{
Native.grpcsharp_metadata_array_destroy_full(handle);
return true;
}
}
}
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