wip. prior to cq refactoring

1 files changed, 250 insertions, 0 deletions

diff --git a/src/cpp/codegen/core_codegen.cc b/src/cpp/codegen/core_codegen.cc
new file mode 100644
index 0000000000..ccae206291
--- /dev/null
+++ b/src/cpp/codegen/core_codegen.cc
@@ -0,0 +1,250 @@
+/*
+ *
+ * Copyright 2016, 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.
+ *
+ */
+
+#include <stdlib.h>
+
+#include <grpc++/impl/codegen/core_codegen_interface.h>
+#include <grpc++/support/config.h>
+#include <grpc/byte_buffer.h>
+#include <grpc/byte_buffer_reader.h>
+#include <grpc/grpc.h>
+#include <grpc/impl/codegen/alloc.h>
+#include <grpc/impl/codegen/byte_buffer.h>
+#include <grpc/impl/codegen/log.h>
+#include <grpc/support/port_platform.h>
+#include <grpc/support/slice.h>
+#include <grpc/support/slice_buffer.h>
+
+#include "src/core/profiling/timers.h"
+
+namespace {
+
+const int kGrpcBufferWriterMaxBufferLength = 8192;
+
+class GrpcBufferWriter GRPC_FINAL
+    : public ::grpc::protobuf::io::ZeroCopyOutputStream {
+ public:
+  explicit GrpcBufferWriter(grpc_byte_buffer** bp,
+                            int block_size)
+      : block_size_(block_size), byte_count_(0), have_backup_(false) {
+    *bp = grpc_raw_byte_buffer_create(NULL, 0);
+    slice_buffer_ = &(*bp)->data.raw.slice_buffer;
+  }
+
+  ~GrpcBufferWriter() GRPC_OVERRIDE {
+    if (have_backup_) {
+      gpr_slice_unref(backup_slice_);
+    }
+  }
+
+  bool Next(void** data, int* size) GRPC_OVERRIDE {
+    if (have_backup_) {
+      slice_ = backup_slice_;
+      have_backup_ = false;
+    } else {
+      slice_ = gpr_slice_malloc(block_size_);
+    }
+    *data = GPR_SLICE_START_PTR(slice_);
+    // On win x64, int is only 32bit
+    GPR_ASSERT(GPR_SLICE_LENGTH(slice_) <= INT_MAX);
+    byte_count_ += * size = (int)GPR_SLICE_LENGTH(slice_);
+    gpr_slice_buffer_add(slice_buffer_, slice_);
+    return true;
+  }
+
+  void BackUp(int count) GRPC_OVERRIDE {
+    gpr_slice_buffer_pop(slice_buffer_);
+    if (count == block_size_) {
+      backup_slice_ = slice_;
+    } else {
+      backup_slice_ =
+          gpr_slice_split_tail(&slice_, GPR_SLICE_LENGTH(slice_) - count);
+      gpr_slice_buffer_add(slice_buffer_, slice_);
+    }
+    have_backup_ = true;
+    byte_count_ -= count;
+  }
+
+  grpc::protobuf::int64 ByteCount() const GRPC_OVERRIDE { return byte_count_; }
+
+ private:
+  const int block_size_;
+  int64_t byte_count_;
+  gpr_slice_buffer* slice_buffer_;
+  bool have_backup_;
+  gpr_slice backup_slice_;
+  gpr_slice slice_;
+};
+
+class GrpcBufferReader GRPC_FINAL
+    : public ::grpc::protobuf::io::ZeroCopyInputStream {
+ public:
+  explicit GrpcBufferReader(grpc_byte_buffer* buffer)
+      : byte_count_(0), backup_count_(0) {
+    grpc_byte_buffer_reader_init(&reader_, buffer);
+  }
+  ~GrpcBufferReader() GRPC_OVERRIDE {
+    grpc_byte_buffer_reader_destroy(&reader_);
+  }
+
+  bool Next(const void** data, int* size) GRPC_OVERRIDE {
+    if (backup_count_ > 0) {
+      *data = GPR_SLICE_START_PTR(slice_) + GPR_SLICE_LENGTH(slice_) -
+              backup_count_;
+      GPR_ASSERT(backup_count_ <= INT_MAX);
+      *size = (int)backup_count_;
+      backup_count_ = 0;
+      return true;
+    }
+    if (!grpc_byte_buffer_reader_next(&reader_, &slice_)) {
+      return false;
+    }
+    gpr_slice_unref(slice_);
+    *data = GPR_SLICE_START_PTR(slice_);
+    // On win x64, int is only 32bit
+    GPR_ASSERT(GPR_SLICE_LENGTH(slice_) <= INT_MAX);
+    byte_count_ += * size = (int)GPR_SLICE_LENGTH(slice_);
+    return true;
+  }
+
+  void BackUp(int count) GRPC_OVERRIDE { backup_count_ = count; }
+
+  bool Skip(int count) GRPC_OVERRIDE {
+    const void* data;
+    int size;
+    while (Next(&data, &size)) {
+      if (size >= count) {
+        BackUp(size - count);
+        return true;
+      }
+      // size < count;
+      count -= size;
+    }
+    // error or we have too large count;
+    return false;
+  }
+
+  grpc::protobuf::int64 ByteCount() const GRPC_OVERRIDE {
+    return byte_count_ - backup_count_;
+  }
+
+ private:
+  int64_t byte_count_;
+  int64_t backup_count_;
+  grpc_byte_buffer_reader reader_;
+  gpr_slice slice_;
+};
+}  // namespace
+
+namespace grpc {
+
+class CoreCodegen : public CoreCodegenInterface {
+ private:
+  grpc_completion_queue* CompletionQueueCreate() override {
+    return grpc_completion_queue_create(nullptr);
+  }
+
+  grpc_event CompletionQueuePluck(grpc_completion_queue* cq, void* tag,
+      gpr_timespec deadline) override {
+    return grpc_completion_queue_pluck(cq, tag, deadline, nullptr);
+  }
+
+  void* gpr_malloc(size_t size) override {
+    return ::gpr_malloc(size);
+  }
+
+  void gpr_free(void* p) override {
+    return ::gpr_free(p);
+  }
+
+  void grpc_byte_buffer_destroy(grpc_byte_buffer* bb) override {
+    ::grpc_byte_buffer_destroy(bb);
+  }
+
+  void grpc_metadata_array_init(grpc_metadata_array* array) override {
+    ::grpc_metadata_array_init(array);
+  }
+
+  void grpc_metadata_array_destroy(grpc_metadata_array* array) override {
+    ::grpc_metadata_array_destroy(array);
+  }
+
+  void assert_fail(const char* failed_assertion) override {
+    gpr_log(GPR_ERROR, "assertion failed: %s", failed_assertion);
+    abort();
+  }
+
+  Status SerializeProto(const grpc::protobuf::Message& msg,
+                                         grpc_byte_buffer** bp) override {
+    GPR_TIMER_SCOPE("SerializeProto", 0);
+    int byte_size = msg.ByteSize();
+    if (byte_size <= kGrpcBufferWriterMaxBufferLength) {
+      gpr_slice slice = gpr_slice_malloc(byte_size);
+      GPR_ASSERT(GPR_SLICE_END_PTR(slice) ==
+                 msg.SerializeWithCachedSizesToArray(GPR_SLICE_START_PTR(slice)));
+      *bp = grpc_raw_byte_buffer_create(&slice, 1);
+      gpr_slice_unref(slice);
+      return Status::OK;
+    } else {
+      GrpcBufferWriter writer(bp, kGrpcBufferWriterMaxBufferLength);
+      return msg.SerializeToZeroCopyStream(&writer)
+                 ? Status::OK
+                 : Status(StatusCode::INTERNAL, "Failed to serialize message");
+    }
+  }
+
+  Status DeserializeProto(grpc_byte_buffer* buffer,
+                          grpc::protobuf::Message* msg, int max_message_size) override {
+    GPR_TIMER_SCOPE("DeserializeProto", 0);
+    if (buffer == nullptr) {
+      return Status(StatusCode::INTERNAL, "No payload");
+    }
+    GrpcBufferReader reader(buffer);
+    ::grpc::protobuf::io::CodedInputStream decoder(&reader);
+    if (max_message_size > 0) {
+      decoder.SetTotalBytesLimit(max_message_size, max_message_size);
+    }
+    if (!msg->ParseFromCodedStream(&decoder)) {
+      grpc_byte_buffer_destroy(buffer);
+      return Status(StatusCode::INTERNAL, msg->InitializationErrorString());
+    }
+    if (!decoder.ConsumedEntireMessage()) {
+      grpc_byte_buffer_destroy(buffer);
+      return Status(StatusCode::INTERNAL, "Did not read entire message");
+    }
+    grpc_byte_buffer_destroy(buffer);
+    return Status::OK;
+  }
+};
+
+}  // namespace grpc