text: /*
   *
   * 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.
   *
   */
  
  #include "src/core/surface/event_string.h"
  
  #include <stdio.h>
  
  #include "src/core/support/grpc_string.h"
  #include <grpc/byte_buffer.h>
  #include <grpc/support/string_util.h>
  
  static void addhdr(gpr_strvec *buf, grpc_event *ev) {
    char *tmp;
    gpr_asprintf(&tmp, "tag:%p", ev->tag);
    gpr_strvec_add(buf, tmp);
  }
  
  static const char *errstr(int success) { return success ? "OK" : "ERROR"; }
  
  static void adderr(gpr_strvec *buf, int success) {
    char *tmp;
    gpr_asprintf(&tmp, " %s", errstr(success));
    gpr_strvec_add(buf, tmp);
  }
  
  char *grpc_event_string(grpc_event *ev) {
    char *out;
    gpr_strvec buf;
  
    if (ev == NULL) return gpr_strdup("null");
  
    gpr_strvec_init(&buf);
  
    switch (ev->type) {
      case GRPC_QUEUE_TIMEOUT:
        gpr_strvec_add(&buf, gpr_strdup("QUEUE_TIMEOUT"));
        break;
      case GRPC_QUEUE_SHUTDOWN:
        gpr_strvec_add(&buf, gpr_strdup("QUEUE_SHUTDOWN"));
        break;
      case GRPC_OP_COMPLETE:
        gpr_strvec_add(&buf, gpr_strdup("OP_COMPLETE: "));
        addhdr(&buf, ev);
        adderr(&buf, ev->success);
        break;
    }
  
    out = gpr_strvec_flatten(&buf, NULL);
    gpr_strvec_destroy(&buf);
    return out;
  }
  