1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
#region Copyright notice and license
// Copyright 2015, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 COPYRIGHT
// OWNER OR CONTRIBUTORS 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.
#endregion
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using Grpc.Core.Internal;
namespace Grpc.Core
{
/// <summary>
/// Server is implemented only to be able to do
/// in-process testing.
/// </summary>
public class Server
{
// TODO: make sure the delegate doesn't get garbage collected while
// native callbacks are in the completion queue.
readonly ServerShutdownCallbackDelegate serverShutdownHandler;
readonly CompletionCallbackDelegate newServerRpcHandler;
readonly BlockingCollection<NewRpcInfo> newRpcQueue = new BlockingCollection<NewRpcInfo>();
readonly ServerSafeHandle handle;
readonly Dictionary<string, IServerCallHandler> callHandlers = new Dictionary<string, IServerCallHandler>();
readonly TaskCompletionSource<object> shutdownTcs = new TaskCompletionSource<object>();
public Server()
{
this.handle = ServerSafeHandle.NewServer(GetCompletionQueue(), IntPtr.Zero);
this.newServerRpcHandler = HandleNewServerRpc;
this.serverShutdownHandler = HandleServerShutdown;
}
// only call this before Start()
public void AddServiceDefinition(ServerServiceDefinition serviceDefinition) {
foreach(var entry in serviceDefinition.CallHandlers)
{
callHandlers.Add(entry.Key, entry.Value);
}
}
// only call before Start()
public int AddPort(string addr) {
return handle.AddPort(addr);
}
public void Start()
{
handle.Start();
// TODO: this basically means the server is single threaded....
StartHandlingRpcs();
}
/// <summary>
/// Requests and handles single RPC call.
/// </summary>
internal void RunRpc()
{
AllowOneRpc();
try
{
var rpcInfo = newRpcQueue.Take();
//Console.WriteLine("Server received RPC " + rpcInfo.Method);
IServerCallHandler callHandler;
if (!callHandlers.TryGetValue(rpcInfo.Method, out callHandler))
{
callHandler = new NoSuchMethodCallHandler();
}
callHandler.StartCall(rpcInfo.Method, rpcInfo.Call, GetCompletionQueue());
}
catch(Exception e)
{
Console.WriteLine("Exception while handling RPC: " + e);
}
}
/// <summary>
/// Requests server shutdown and when there are no more calls being serviced,
/// cleans up used resources.
/// </summary>
/// <returns>The async.</returns>
public async Task ShutdownAsync() {
handle.ShutdownAndNotify(serverShutdownHandler);
await shutdownTcs.Task;
handle.Dispose();
}
public void Kill() {
handle.Dispose();
}
private async Task StartHandlingRpcs() {
while (true)
{
await Task.Factory.StartNew(RunRpc);
}
}
private void AllowOneRpc()
{
AssertCallOk(handle.RequestCall(GetCompletionQueue(), newServerRpcHandler));
}
private void HandleNewServerRpc(GRPCOpError error, IntPtr batchContextPtr) {
try {
var ctx = new BatchContextSafeHandleNotOwned(batchContextPtr);
if (error != GRPCOpError.GRPC_OP_OK) {
// TODO: handle error
}
var rpcInfo = new NewRpcInfo(ctx.GetServerRpcNewCall(), ctx.GetServerRpcNewMethod());
// after server shutdown, the callback returns with null call
if (!rpcInfo.Call.IsInvalid) {
newRpcQueue.Add(rpcInfo);
}
} catch(Exception e) {
Console.WriteLine("Caught exception in a native handler: " + e);
}
}
private void HandleServerShutdown(IntPtr eventPtr)
{
try
{
shutdownTcs.SetResult(null);
}
catch (Exception e)
{
Console.WriteLine("Caught exception in a native handler: " + e);
}
}
private static void AssertCallOk(GRPCCallError callError)
{
Trace.Assert(callError == GRPCCallError.GRPC_CALL_OK, "Status not GRPC_CALL_OK");
}
private static CompletionQueueSafeHandle GetCompletionQueue()
{
return GrpcEnvironment.ThreadPool.CompletionQueue;
}
private struct NewRpcInfo
{
private CallSafeHandle call;
private string method;
public NewRpcInfo(CallSafeHandle call, string method)
{
this.call = call;
this.method = method;
}
public CallSafeHandle Call
{
get
{
return this.call;
}
}
public string Method
{
get
{
return this.method;
}
}
}
}
}
|
