/
client.c
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/
client.c
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#include <curl/curl.h>
#include <string.h>
#include "m2x.h"
#include "client.h"
static const char *M2X_HOST = "http://api-m2x.att.com/v1";
char *create_url(m2x_context *ctx, const char *path)
{
int host_len, path_len;
char *p;
host_len = strlen(M2X_HOST);
path_len = strlen(path);
p = m2x_malloc(ctx, host_len + path_len + 1);
strncpy(p, M2X_HOST, host_len);
strcpy(p + host_len, path);
return p;
}
typedef struct curl_write_context {
m2x_context *m2x_ctx;
int length;
int index;
char* p;
} curl_write_context;
static curl_write_context *create_write_context(m2x_context *ctx)
{
curl_write_context *write_ctx;
write_ctx = m2x_malloc(ctx, sizeof(curl_write_context));
write_ctx->m2x_ctx = ctx;
write_ctx->length = 0;
write_ctx->index = 0;
write_ctx->p = NULL;
return write_ctx;
}
static void release_write_context(curl_write_context* write_ctx, int release_buf)
{
if (release_buf) {
m2x_free(write_ctx->p);
}
m2x_free(write_ctx);
}
static size_t calculate_new_length(size_t old_len, size_t need_len)
{
size_t cal_len;
/* NOTE: This is a very dump algorithm here, but it can be a good start. */
if (old_len <= 0) {
cal_len = 128;
} else {
cal_len = old_len / 2;
}
return old_len + ((need_len > cal_len) ? need_len : cal_len);
}
static size_t
write_callback(char *ptr, size_t size, size_t nmemb, void *userdata)
{
curl_write_context *ctx;
int left_size, need_size;
ctx = (curl_write_context *) userdata;
left_size = ctx->length - ctx->index;
need_size = size * nmemb + 1;
if (need_size > left_size) {
ctx->length = calculate_new_length(ctx->length, need_size);
ctx->p = m2x_realloc(ctx->m2x_ctx, ctx->p, ctx->length);
}
strncpy(ctx->p + ctx->index, ptr, size * nmemb);
ctx->index += size * nmemb;
ctx->p[ctx->index] = '\0';
return (size * nmemb);
}
int m2x_client_get(m2x_context *ctx, const char *path, char **out)
{
curl_write_context *write_ctx;
char *url;
CURLcode res;
write_ctx = create_write_context(ctx);
url = create_url(ctx, path);
curl_easy_reset(ctx->curl);
curl_easy_setopt(ctx->curl, CURLOPT_URL, url);
m2x_free(url);
if (ctx->verbose) { curl_easy_setopt(ctx->curl, CURLOPT_VERBOSE, 1); }
curl_easy_setopt(ctx->curl, CURLOPT_HTTPHEADER, ctx->headers);
curl_easy_setopt(ctx->curl, CURLOPT_WRITEDATA, write_ctx);
curl_easy_setopt(ctx->curl, CURLOPT_WRITEFUNCTION, write_callback);
res = curl_easy_perform(ctx->curl);
if (res != CURLE_OK) {
fprintf(stderr, "GET failed: %s\n",
curl_easy_strerror(res));
release_write_context(write_ctx, 1);
return res;
}
if (out != NULL) {
*out = write_ctx->p;
} else {
m2x_free(write_ctx->p);
}
release_write_context(write_ctx, 0);
return res;
}
int m2x_client_post(m2x_context *ctx, const char *path, const char *data,
char **out)
{
curl_write_context *write_ctx;
char *url;
CURLcode res;
write_ctx = create_write_context(ctx);
url = create_url(ctx, path);
curl_easy_reset(ctx->curl);
curl_easy_setopt(ctx->curl, CURLOPT_URL, url);
m2x_free(url);
if (ctx->verbose) { curl_easy_setopt(ctx->curl, CURLOPT_VERBOSE, 1); }
curl_easy_setopt(ctx->curl, CURLOPT_HTTPHEADER, ctx->headers);
curl_easy_setopt(ctx->curl, CURLOPT_POSTFIELDS,
(data && (strlen(data) > 0)) ? data : "");
curl_easy_setopt(ctx->curl, CURLOPT_WRITEDATA, write_ctx);
curl_easy_setopt(ctx->curl, CURLOPT_WRITEFUNCTION, write_callback);
res = curl_easy_perform(ctx->curl);
if (res != CURLE_OK) {
fprintf(stderr, "POST failed: %s\n",
curl_easy_strerror(res));
release_write_context(write_ctx, 1);
return res;
}
if (out != NULL) {
*out = write_ctx->p;
} else {
m2x_free(write_ctx->p);
}
release_write_context(write_ctx, 0);
return res;
}
int m2x_client_put(m2x_context *ctx, const char *path, const char *data,
char **out)
{
curl_write_context *write_ctx;
char *url;
CURLcode res;
write_ctx = create_write_context(ctx);
url = create_url(ctx, path);
curl_easy_reset(ctx->curl);
curl_easy_setopt(ctx->curl, CURLOPT_URL, url);
m2x_free(url);
if (ctx->verbose) { curl_easy_setopt(ctx->curl, CURLOPT_VERBOSE, 1); }
curl_easy_setopt(ctx->curl, CURLOPT_HTTPHEADER, ctx->headers);
curl_easy_setopt(ctx->curl, CURLOPT_CUSTOMREQUEST, "PUT");
curl_easy_setopt(ctx->curl, CURLOPT_POSTFIELDS,
(data && (strlen(data) > 0)) ? data : "");
curl_easy_setopt(ctx->curl, CURLOPT_WRITEDATA, write_ctx);
curl_easy_setopt(ctx->curl, CURLOPT_WRITEFUNCTION, write_callback);
res = curl_easy_perform(ctx->curl);
if (res != CURLE_OK) {
fprintf(stderr, "POST failed: %s\n",
curl_easy_strerror(res));
release_write_context(write_ctx, 1);
return res;
}
if (out != NULL) {
*out = write_ctx->p;
} else {
m2x_free(write_ctx->p);
}
release_write_context(write_ctx, 0);
return res;
}
int m2x_client_delete(m2x_context *ctx, const char *path, char **out)
{
curl_write_context *write_ctx;
char *url;
CURLcode res;
write_ctx = create_write_context(ctx);
url = create_url(ctx, path);
curl_easy_reset(ctx->curl);
curl_easy_setopt(ctx->curl, CURLOPT_URL, url);
m2x_free(url);
if (ctx->verbose) { curl_easy_setopt(ctx->curl, CURLOPT_VERBOSE, 1); }
curl_easy_setopt(ctx->curl, CURLOPT_HTTPHEADER, ctx->headers);
curl_easy_setopt(ctx->curl, CURLOPT_CUSTOMREQUEST, "DELETE");
curl_easy_setopt(ctx->curl, CURLOPT_WRITEDATA, write_ctx);
curl_easy_setopt(ctx->curl, CURLOPT_WRITEFUNCTION, write_callback);
res = curl_easy_perform(ctx->curl);
if (res != CURLE_OK) {
fprintf(stderr, "DELETE failed: %s\n",
curl_easy_strerror(res));
release_write_context(write_ctx, 1);
}
if (out != NULL) {
*out = write_ctx->p;
} else {
m2x_free(write_ctx->p);
}
release_write_context(write_ctx, 0);
return res;
}