replace bank_api_context with libgnunetcurl

1 files changed, 0 insertions, 570 deletions

diff --git a/src/bank-lib/bank_api_context.c b/src/bank-lib/bank_api_context.c
deleted file mode 100644
index 2e4083ca..00000000
--- a/src/bank-lib/bank_api_context.c
+++ /dev/null
@@ -1,570 +0,0 @@
-/*
-  This file is part of TALER
-  Copyright (C) 2014, 2015 GNUnet e.V.
-
-  TALER is free software; you can redistribute it and/or modify it under the
-  terms of the GNU General Public License as published by the Free Software
-  Foundation; either version 3, or (at your option) any later version.
-
-  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
-  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License along with
-  TALER; see the file COPYING.  If not, If not, see
-  <http://www.gnu.org/licenses/>
-*/
-/**
- * @file bank-lib/bank_api_context.c
- * @brief Implementation of the context part of the bank's HTTP API
- * @author Sree Harsha Totakura <sreeharsha@totakura.in>
- * @author Christian Grothoff
- */
-#include "platform.h"
-#include <curl/curl.h>
-#include "taler_bank_service.h"
-#include "bank_api_context.h"
-
-
-/**
- * Log error related to CURL operations.
- *
- * @param type log level
- * @param function which function failed to run
- * @param code what was the curl error code
- */
-#define CURL_STRERROR(type, function, code)      \
- GNUNET_log (type,                               \
-             "Curl function `%s' has failed at `%s:%d' with error: %s\n", \
-             function, __FILE__, __LINE__, curl_easy_strerror (code));
-
-/**
- * Print JSON parsing related error information
- */
-#define JSON_WARN(error)                                                \
-    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,                              \
-                "JSON parsing failed at %s:%u: %s (%s)\n",              \
-                __FILE__, __LINE__, error.text, error.source)
-
-
-/**
- * Failsafe flag. Raised if our constructor fails to initialize
- * the Curl library.
- */
-static int TALER_BANK_curl_fail;
-
-
-/**
- * Jobs are CURL requests running within a `struct TALER_BANK_Context`.
- */
-struct BAC_Job
-{
-
-  /**
-   * We keep jobs in a DLL.
-   */
-  struct BAC_Job *next;
-
-  /**
-   * We keep jobs in a DLL.
-   */
-  struct BAC_Job *prev;
-
-  /**
-   * Easy handle of the job.
-   */
-  CURL *easy_handle;
-
-  /**
-   * Context this job runs in.
-   */
-  struct TALER_BANK_Context *ctx;
-
-  /**
-   * Function to call upon completion.
-   */
-  BAC_JobCompletionCallback jcc;
-
-  /**
-   * Closure for @e jcc.
-   */
-  void *jcc_cls;
-
-};
-
-
-/**
- * Context
- */
-struct TALER_BANK_Context
-{
-  /**
-   * Curl multi handle
-   */
-  CURLM *multi;
-
-  /**
-   * Curl share handle
-   */
-  CURLSH *share;
-
-  /**
-   * We keep jobs in a DLL.
-   */
-  struct BAC_Job *jobs_head;
-
-  /**
-   * We keep jobs in a DLL.
-   */
-  struct BAC_Job *jobs_tail;
-
-  /**
-   * HTTP header "application/json", created once and used
-   * for all requests that need it.
-   */
-  struct curl_slist *json_header;
-
-  /**
-   * Base URL of the bank.
-   */
-  char *url;
-
-};
-
-
-/**
- * Initialise this library.  This function should be called before using any of
- * the following functions.
- *
- * @param url HTTP base URL for the bank
- * @return library context
- */
-struct TALER_BANK_Context *
-TALER_BANK_init (const char *url)
-{
-  struct TALER_BANK_Context *ctx;
-  CURLM *multi;
-  CURLSH *share;
-
-  if (TALER_BANK_curl_fail)
-  {
-    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-                "Curl was not initialised properly\n");
-    return NULL;
-  }
-  if (NULL == (multi = curl_multi_init ()))
-  {
-    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-                "Failed to create a Curl multi handle\n");
-    return NULL;
-  }
-  if (NULL == (share = curl_share_init ()))
-  {
-    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-                "Failed to create a Curl share handle\n");
-    return NULL;
-  }
-  ctx = GNUNET_new (struct TALER_BANK_Context);
-  ctx->multi = multi;
-  ctx->share = share;
-  ctx->url = GNUNET_strdup (url);
-  GNUNET_assert (NULL != (ctx->json_header =
-                          curl_slist_append (NULL,
-                                             "Content-Type: application/json")));
-  return ctx;
-}
-
-
-/**
- * Schedule a CURL request to be executed and call the given @a jcc
- * upon its completion.  Note that the context will make use of the
- * CURLOPT_PRIVATE facility of the CURL @a eh.  Applications can
- * instead use #BAC_easy_to_closure to extract the @a jcc_cls argument
- * from a valid @a eh afterwards.
- *
- * This function modifies the CURL handle to add the
- * "Content-Type: application/json" header if @a add_json is set.
- *
- * @param ctx context to execute the job in
- * @param eh curl easy handle for the request, will
- *           be executed AND cleaned up
- * @param add_json add "application/json" content type header
- * @param jcc callback to invoke upon completion
- * @param jcc_cls closure for @a jcc
- */
-struct BAC_Job *
-BAC_job_add (struct TALER_BANK_Context *ctx,
-             CURL *eh,
-             int add_json,
-             BAC_JobCompletionCallback jcc,
-             void *jcc_cls)
-{
-  struct BAC_Job *job;
-
-  if (GNUNET_YES == add_json)
-    GNUNET_assert (CURLE_OK ==
-                   curl_easy_setopt (eh,
-                                     CURLOPT_HTTPHEADER,
-                                     ctx->json_header));
-
-  job = GNUNET_new (struct BAC_Job);
-  job->easy_handle = eh;
-  job->ctx = ctx;
-  job->jcc = jcc;
-  job->jcc_cls = jcc_cls;
-  GNUNET_CONTAINER_DLL_insert (ctx->jobs_head,
-                               ctx->jobs_tail,
-                               job);
-  GNUNET_assert (CURLE_OK ==
-                 curl_easy_setopt (eh,
-                                   CURLOPT_PRIVATE,
-                                   job));
-  GNUNET_assert (CURLE_OK ==
-                 curl_easy_setopt (eh,
-                                   CURLOPT_SHARE,
-                                   ctx->share));
-  GNUNET_assert (CURLM_OK ==
-                 curl_multi_add_handle (ctx->multi,
-                                        eh));
-  return job;
-}
-
-
-/**
- * Obtain the `jcc_cls` argument from an `eh` that was
- * given to #BAC_job_add().
- *
- * @param eh easy handle that was used
- * @return the `jcc_cls` that was given to #BAC_job_add().
- */
-void *
-BAC_easy_to_closure (CURL *eh)
-{
-  struct BAC_Job *job;
-
-  GNUNET_assert (CURLE_OK ==
-                 curl_easy_getinfo (eh,
-                                    CURLINFO_PRIVATE,
-                                    (char **) &job));
-  return job->jcc_cls;
-}
-
-
-/**
- * Cancel a job.  Must only be called before the job completion
- * callback is called for the respective job.
- *
- * @param job job to cancel
- */
-void
-BAC_job_cancel (struct BAC_Job *job)
-{
-  struct TALER_BANK_Context *ctx = job->ctx;
-
-  GNUNET_CONTAINER_DLL_remove (ctx->jobs_head,
-                               ctx->jobs_tail,
-                               job);
-  GNUNET_assert (CURLM_OK ==
-                 curl_multi_remove_handle (ctx->multi,
-                                           job->easy_handle));
-  curl_easy_cleanup (job->easy_handle);
-  GNUNET_free (job);
-}
-
-
-/**
- * Run the main event loop for the Taler interaction.
- *
- * @param ctx the library context
- */
-void
-TALER_BANK_perform (struct TALER_BANK_Context *ctx)
-{
-  CURLMsg *cmsg;
-  struct BAC_Job *job;
-  int n_running;
-  int n_completed;
-
-  (void) curl_multi_perform (ctx->multi,
-                             &n_running);
-  while (NULL != (cmsg = curl_multi_info_read (ctx->multi,
-                                               &n_completed)))
-  {
-    /* Only documented return value is CURLMSG_DONE */
-    GNUNET_break (CURLMSG_DONE == cmsg->msg);
-    GNUNET_assert (CURLE_OK ==
-                   curl_easy_getinfo (cmsg->easy_handle,
-                                      CURLINFO_PRIVATE,
-                                      (char **) &job));
-    GNUNET_assert (job->ctx == ctx);
-    job->jcc (job->jcc_cls,
-              cmsg->easy_handle);
-    BAC_job_cancel (job);
-  }
-}
-
-
-/**
- * Obtain the information for a select() call to wait until
- * #TALER_BANK_perform() is ready again.  Note that calling
- * any other TALER_BANK-API may also imply that the library
- * is again ready for #TALER_BANK_perform().
- *
- * Basically, a client should use this API to prepare for select(),
- * then block on select(), then call #TALER_BANK_perform() and then
- * start again until the work with the context is done.
- *
- * This function will NOT zero out the sets and assumes that @a max_fd
- * and @a timeout are already set to minimal applicable values.  It is
- * safe to give this API FD-sets and @a max_fd and @a timeout that are
- * already initialized to some other descriptors that need to go into
- * the select() call.
- *
- * @param ctx context to get the event loop information for
- * @param read_fd_set will be set for any pending read operations
- * @param write_fd_set will be set for any pending write operations
- * @param except_fd_set is here because curl_multi_fdset() has this argument
- * @param max_fd set to the highest FD included in any set;
- *        if the existing sets have no FDs in it, the initial
- *        value should be "-1". (Note that `max_fd + 1` will need
- *        to be passed to select().)
- * @param timeout set to the timeout in milliseconds (!); -1 means
- *        no timeout (NULL, blocking forever is OK), 0 means to
- *        proceed immediately with #TALER_BANK_perform().
- */
-void
-TALER_BANK_get_select_info (struct TALER_BANK_Context *ctx,
-                            fd_set *read_fd_set,
-                            fd_set *write_fd_set,
-                            fd_set *except_fd_set,
-                            int *max_fd,
-                            long *timeout)
-{
-  long to;
-  int m;
-
-  m = -1;
-  GNUNET_assert (CURLM_OK ==
-                 curl_multi_fdset (ctx->multi,
-                                   read_fd_set,
-                                   write_fd_set,
-                                   except_fd_set,
-                                   &m));
-  to = *timeout;
-  *max_fd = GNUNET_MAX (m, *max_fd);
-  GNUNET_assert (CURLM_OK ==
-                 curl_multi_timeout (ctx->multi,
-                                     &to));
-
-  /* Only if what we got back from curl is smaller than what we
-     already had (-1 == infinity!), then update timeout */
-  if ( (to < *timeout) &&
-       (-1 != to) )
-    *timeout = to;
-  if ( (-1 == (*timeout)) &&
-       (NULL != ctx->jobs_head) )
-    *timeout = to;
-}
-
-
-/**
- * Cleanup library initialisation resources.  This function should be called
- * after using this library to cleanup the resources occupied during library's
- * initialisation.
- *
- * @param ctx the library context
- */
-void
-TALER_BANK_fini (struct TALER_BANK_Context *ctx)
-{
-  /* all jobs must have been cancelled at this time, assert this */
-  GNUNET_assert (NULL == ctx->jobs_head);
-  curl_share_cleanup (ctx->share);
-  curl_multi_cleanup (ctx->multi);
-  curl_slist_free_all (ctx->json_header);
-  GNUNET_free (ctx->url);
-  GNUNET_free (ctx);
-}
-
-
-/**
- * Obtain the URL to use for an API request.
- *
- * @param h the exchange handle to query
- * @param path Taler API path (i.e. "/reserve/withdraw")
- * @return the full URI to use with cURL
- */
-char *
-BAC_path_to_url (struct TALER_BANK_Context *h,
-                 const char *path)
-{
-  char *url;
-
-  if ( ('/' == path[0]) &&
-       (0 < strlen (h->url)) &&
-       ('/' == h->url[strlen (h->url) - 1]) )
-    path++; /* avoid generating URL with "//" from concat */
-  GNUNET_asprintf (&url,
-                   "%s%s",
-                   h->url,
-                   path);
-  return url;
-}
-
-
-/**
- * Callback used when downloading the reply to an HTTP request.
- * Just appends all of the data to the `buf` in the
- * `struct BAC_DownloadBuffer` for further processing. The size of
- * the download is limited to #GNUNET_MAX_MALLOC_CHECKED, if
- * the download exceeds this size, we abort with an error.
- *
- * @param bufptr data downloaded via HTTP
- * @param size size of an item in @a bufptr
- * @param nitems number of items in @a bufptr
- * @param cls the `struct KeysRequest`
- * @return number of bytes processed from @a bufptr
- */
-size_t
-BAC_download_cb (char *bufptr,
-                 size_t size,
-                 size_t nitems,
-                 void *cls)
-{
-  struct BAC_DownloadBuffer *db = cls;
-  size_t msize;
-  void *buf;
-
-  if (0 == size * nitems)
-  {
-    /* Nothing (left) to do */
-    return 0;
-  }
-  msize = size * nitems;
-  if ( (msize + db->buf_size) >= GNUNET_MAX_MALLOC_CHECKED)
-  {
-    db->eno = ENOMEM;
-    return 0; /* signals an error to curl */
-  }
-  db->buf = GNUNET_realloc (db->buf,
-                            db->buf_size + msize);
-  buf = db->buf + db->buf_size;
-  memcpy (buf, bufptr, msize);
-  db->buf_size += msize;
-  return msize;
-}
-
-
-/**
- * Obtain information about the final result about the
- * HTTP download. If the download was successful, parses
- * the JSON in the @a db and returns it. Also returns
- * the HTTP @a response_code.  If the download failed,
- * the return value is NULL.  The response code is set
- * in any case, on download errors to zero.
- *
- * Calling this function also cleans up @a db.
- *
- * @param db download buffer
- * @param eh CURL handle (to get the response code)
- * @param[out] response_code set to the HTTP response code
- *             (or zero if we aborted the download, i.e.
- *              because the response was too big, or if
- *              the JSON we received was malformed).
- * @return NULL if downloading a JSON reply failed
- */
-json_t *
-BAC_download_get_result (struct BAC_DownloadBuffer *db,
-                         CURL *eh,
-                         long *response_code)
-{
-  json_t *json;
-  json_error_t error;
-  char *ct;
-
-  if ( (CURLE_OK !=
-        curl_easy_getinfo (eh,
-                           CURLINFO_CONTENT_TYPE,
-                           &ct)) ||
-       (NULL == ct) ||
-       (0 != strcasecmp (ct,
-                         "application/json")) )
-  {
-    /* No content type or explicitly not JSON, refuse to parse
-       (but keep response code) */
-    if (CURLE_OK !=
-        curl_easy_getinfo (eh,
-                           CURLINFO_RESPONSE_CODE,
-                           response_code))
-    {
-      /* unexpected error... */
-      GNUNET_break (0);
-      *response_code = 0;
-    }
-    return NULL;
-  }
-
-  json = NULL;
-  if (0 == db->eno)
-  {
-    json = json_loadb (db->buf,
-                       db->buf_size,
-                       JSON_REJECT_DUPLICATES | JSON_DISABLE_EOF_CHECK,
-                       &error);
-    if (NULL == json)
-    {
-      JSON_WARN (error);
-      *response_code = 0;
-    }
-  }
-  GNUNET_free_non_null (db->buf);
-  db->buf = NULL;
-  db->buf_size = 0;
-  if (NULL != json)
-  {
-    if (CURLE_OK !=
-        curl_easy_getinfo (eh,
-                           CURLINFO_RESPONSE_CODE,
-                           response_code))
-    {
-      /* unexpected error... */
-      GNUNET_break (0);
-      *response_code = 0;
-    }
-  }
-  return json;
-}
-
-
-/**
- * Initial global setup logic, specifically runs the Curl setup.
- */
-__attribute__ ((constructor))
-void
-TALER_BANK_constructor__ (void)
-{
-  CURLcode ret;
-
-  if (CURLE_OK != (ret = curl_global_init (CURL_GLOBAL_DEFAULT)))
-  {
-    CURL_STRERROR (GNUNET_ERROR_TYPE_ERROR,
-                   "curl_global_init",
-                   ret);
-    TALER_BANK_curl_fail = 1;
-  }
-}
-
-
-/**
- * Cleans up after us, specifically runs the Curl cleanup.
- */
-__attribute__ ((destructor))
-void
-TALER_BANK_destructor__ (void)
-{
-  if (TALER_BANK_curl_fail)
-    return;
-  curl_global_cleanup ();
-}
-
-/* end of bank_api_context.c */