/*
 *
 * 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef GRPC_INTERNAL_CORE_HTTPCLI_HTTPCLI_H
#define GRPC_INTERNAL_CORE_HTTPCLI_HTTPCLI_H

#include <stddef.h>

#include <grpc/support/time.h>

/* User agent this library reports */
#define GRPC_HTTPCLI_USER_AGENT "grpc-httpcli/0.0"
/* Maximum length of a header string of the form 'Key: Value\r\n' */
#define GRPC_HTTPCLI_MAX_HEADER_LENGTH 4096

/* A single header to be passed in a request */
typedef struct grpc_httpcli_header {
  char *key;
  char *value;
} grpc_httpcli_header;

/* A request */
typedef struct grpc_httpcli_request {
  /* The host name to connect to */
  char *host;
  /* The path of the resource to fetch */
  char *path;
  /* Additional headers: count and key/values; the following are supplied
     automatically and MUST NOT be set here:
       Host, Connection, User-Agent */
  size_t hdr_count;
  grpc_httpcli_header *hdrs;
  /* whether to use ssl for the request */
  int use_ssl;
} grpc_httpcli_request;

/* A response */
typedef struct grpc_httpcli_response {
  /* HTTP status code */
  int status;
  /* Headers: count and key/values */
  size_t hdr_count;
  grpc_httpcli_header *hdrs;
  /* Body: length and contents; contents are NOT null-terminated */
  size_t body_length;
  char *body;
} grpc_httpcli_response;

/* Callback for grpc_httpcli_get */
typedef void (*grpc_httpcli_response_cb)(void *user_data,
                                         const grpc_httpcli_response *response);

/* Asynchronously perform a HTTP GET.
   'request' contains request parameters - these are caller owned and can be
     destroyed once the call returns
   'deadline' contains a deadline for the request (or gpr_inf_future)
   'em' points to a caller owned event manager that must be alive for the
     lifetime of the request
   'on_response' is a callback to report results to (and 'user_data' is a user
     supplied pointer to pass to said call) */
void grpc_httpcli_get(const grpc_httpcli_request *request,
                      gpr_timespec deadline,
                      grpc_httpcli_response_cb on_response, void *user_data);

/* Asynchronously perform a HTTP POST.
   When there is no body, pass in NULL as body_bytes.
   Does not support ?var1=val1&var2=val2 in the path. */
void grpc_httpcli_post(const grpc_httpcli_request *request,
                       const char *body_bytes, size_t body_size,
                       gpr_timespec deadline,
                       grpc_httpcli_response_cb on_response, void *user_data);

/* override functions return 1 if they handled the request, 0 otherwise */
typedef int (*grpc_httpcli_get_override)(const grpc_httpcli_request *request,
                                         gpr_timespec deadline,
                                         grpc_httpcli_response_cb on_response,
                                         void *user_data);
typedef int (*grpc_httpcli_post_override)(const grpc_httpcli_request *request,
                                          const char *body_bytes,
                                          size_t body_size,
                                          gpr_timespec deadline,
                                          grpc_httpcli_response_cb on_response,
                                          void *user_data);

void grpc_httpcli_set_override(grpc_httpcli_get_override get,
                               grpc_httpcli_post_override post);

#endif  /* GRPC_INTERNAL_CORE_HTTPCLI_HTTPCLI_H */
