1    :  // Copyright 2012 Google Inc.
   2    :  //
   3    :  // Licensed under the Apache License, Version 2.0 (the "License");
   4    :  // you may not use this file except in compliance with the License.
   5    :  // You may obtain a copy of the License at
   6    :  //
   7    :  //     http://www.apache.org/licenses/LICENSE-2.0
   8    :  //
   9    :  // Unless required by applicable law or agreed to in writing, software
  10    :  // distributed under the License is distributed on an "AS IS" BASIS,
  11    :  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    :  // See the License for the specific language governing permissions and
  13    :  // limitations under the License.
  14    :  //
  15    :  // Helper functions to wrap RPC invocations.
  16    :  
  17    :  #ifndef SYZYGY_TRACE_RPC_RPC_HELPERS_H_
  18    :  #define SYZYGY_TRACE_RPC_RPC_HELPERS_H_
  19    :  
  20    :  #include <rpc.h>
  21    :  #include <wtypes.h>
  22    :  
  23    :  #include "base/string_piece.h"
  24    :  
  25    :  // TODO(rogerm): Is there directly usable stuff in base/callback.h that
  26    :  //     might make this simpler/cleaner?
  27    :  
  28    :  namespace trace {
  29    :  namespace client {
  30    :  
  31    :  // Create an RPC binding.
  32    :  //
  33    :  // @param protocol The RPC protocol to bind.
  34    :  // @param endpoint The endoint/address to bind.
  35    :  // @param out_handle A handle to the rpc binding will be returned here.
  36    :  //
  37    :  // @return true on success.
  38    :  bool CreateRpcBinding(const base::StringPiece16& protocol,
  39    :                        const base::StringPiece16& endpoint,
  40    :                        handle_t* out_handle);
  41    :  
  42    :  // Structure returned by RPC calls
  43    :  struct RpcStatus {
  44    :    boolean exception_occurred;
  45    :    boolean result;
  46    :  
  47  E :    bool succeeded() const {
  48  E :      return exception_occurred == FALSE && result == TRUE;
  49  E :    }
  50    :  };
  51    :  
  52    :  // Helper to invoke an RPC function taking one parameter.
  53    :  template<typename Func, typename T1>
  54  E :  RpcStatus InvokeRpc(const Func& func, const T1& p1) {
  55  E :    RpcStatus status = { FALSE, FALSE };
  56  E :    RpcTryExcept {
  57  E :      status.result = func(p1);
  58  E :    } RpcExcept(1) {
  59  i :      status.exception_occurred = TRUE;
  60  i :    } RpcEndExcept;
  61  E :    return status;
  62  E :  }
  63    :  
  64    :  // Helper to invoke an RPC function taking two parameters.
  65    :  template<typename Func, typename T1, typename T2>
  66  E :  RpcStatus InvokeRpc(const Func& func, const T1& p1, const T2& p2) {
  67  E :    RpcStatus status = { FALSE, FALSE };
  68  E :    RpcTryExcept {
  69  E :      status.result = func(p1, p2);
  70  E :    } RpcExcept(1) {
  71  i :      status.exception_occurred = TRUE;
  72  i :    } RpcEndExcept;
  73  E :    return status;
  74  E :  }
  75    :  
  76    :  // Helper to invoke an RPC function taking three parameters.
  77    :  template<typename Func, typename T1, typename T2, typename T3>
  78    :  RpcStatus InvokeRpc(const Func& func,
  79  E :                      const T1& p1, const T2& p2, const T3& p3) {
  80  E :    RpcStatus status = { FALSE, FALSE };
  81  E :    RpcTryExcept {
  82  E :      status.result = func(p1, p2, p3);
  83  E :    } RpcExcept(1) {
  84  i :      status.exception_occurred = TRUE;
  85  i :    } RpcEndExcept;
  86  E :    return status;
  87  E :  }
  88    :  
  89    :  // Helper to invoke an RPC function taking four parameters.
  90    :  template<typename Func, typename T1, typename T2, typename T3, typename T4>
  91    :  RpcStatus InvokeRpc(const Func& func,
  92  E :                      const T1& p1, const T2& p2, const T3& p3, const T4& p4) {
  93  E :    RpcStatus status = { FALSE, FALSE };
  94  E :    RpcTryExcept {
  95  E :      status.result = func(p1, p2, p3, p4);
  96  E :    } RpcExcept(1) {
  97  E :      status.exception_occurred = TRUE;
  98  E :    } RpcEndExcept;
  99  E :    return status;
 100  E :  }
 101    :  
 102    :  // Helper to invoke an RPC function taking five parameters.
 103    :  template<typename Func,
 104    :           typename T1, typename T2, typename T3, typename T4, typename T5>
 105    :  RpcStatus InvokeRpc(const Func& func,
 106    :                      const T1& p1, const T2& p2, const T3& p3, const T4& p4,
 107    :                      const T5& p5) {
 108    :    RpcStatus status = { FALSE, FALSE };
 109    :    RpcTryExcept {
 110    :      status.result = func(p1, p2, p3, p4, p5);
 111    :    } RpcExcept(1) {
 112    :      status.exception_occurred = TRUE;
 113    :    } RpcEndExcept;
 114    :    return status;
 115    :  }
 116    :  
 117    :  }  // namespace trace::client
 118    :  }  // namespace trace
 119    :  
 120    :  #endif  // SYZYGY_TRACE_RPC_RPC_HELPERS_H_