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// callbacks.c: implements curl_easy_setopt options that take callbacks
#include "jurl.h"
static size_t write_callback(char *ptr, size_t size, size_t nmemb, void *userdata) {
JanetFunction *fun = (JanetFunction*)userdata;
size_t realsize = size * nmemb;
JanetBuffer *buf = janet_buffer(realsize);
janet_buffer_push_bytes(buf, (const uint8_t*)ptr, realsize);
Janet argv[1] = { janet_wrap_buffer(buf), };
Janet out = janet_call(fun, 1, argv);
if (janet_checktype(out, JANET_NUMBER)) {
return janet_unwrap_integer(out); // TODO: maybe try 64bit?
}
return realsize;
}
static size_t read_callback(char *buffer, size_t size, size_t nitems, void *userdata) {
JanetFunction *fun = (JanetFunction*)userdata;
size_t realsize = size * nitems;
Janet argv[1] = { janet_wrap_integer(realsize), };
Janet res = janet_call(fun, 1, argv);
if (janet_checktype(res, JANET_NIL)) return 0;
JanetByteView bytes;
if (!janet_bytes_view(res, &bytes.bytes, &bytes.len)) {
janet_panic("could not open bytesview in read_callback");
}
size_t actualsize = realsize > bytes.len ? bytes.len : realsize;
memcpy(buffer, bytes.bytes, actualsize);
return actualsize;
}
static int progress_callback(void *clientp,
curl_off_t dltotal,
curl_off_t dlnow,
curl_off_t ultotal,
curl_off_t ulnow) {
JanetFunction *fun = (JanetFunction*)clientp;
Janet argv[4] = { janet_wrap_integer(dltotal),
janet_wrap_integer(dlnow),
janet_wrap_integer(ultotal),
janet_wrap_integer(ulnow), };
Janet res = janet_call(fun, 4, argv);
return janet_truthy(res) ? CURL_PROGRESSFUNC_CONTINUE : 1;
}
static size_t header_callback(char *buffer,
size_t size,
size_t nitems,
void *userdata) {
JanetFunction *fun = (JanetFunction*)userdata;
size_t realsize = size * nitems;
Janet argv[1] = { janet_stringv((const uint8_t*)buffer, realsize), };
janet_call(fun, 1, argv);
return realsize;
}
static int debug_callback(CURL *handle,
curl_infotype type,
char *data,
size_t size,
void *clientp) {
JanetFunction *fun = (JanetFunction*)clientp;
char *kw;
switch (type) {
case CURLINFO_TEXT:
kw = "text";
break;
case CURLINFO_HEADER_IN:
kw = "header-in";
break;
case CURLINFO_HEADER_OUT:
kw = "header-out";
break;
case CURLINFO_DATA_IN:
kw = "data-in";
break;
case CURLINFO_DATA_OUT:
kw = "data-out";
break;
case CURLINFO_SSL_DATA_IN:
kw = "ssl-data-in";
break;
case CURLINFO_SSL_DATA_OUT:
kw = "ssl-data-out";
break;
case CURLINFO_END:
kw = "end";
break;
default:
janet_panic("unrecognized curl_infotype in debug_callback");
}
Janet argv[3] = { janet_wrap_pointer(handle),
janet_ckeywordv(kw),
janet_stringv((const uint8_t*)data, size), };
janet_call(fun, 3, argv);
return 0;
}
static int fnmatch_callback(void *ptr, const char *pattern, const char *string) {
JanetFunction *fun = (JanetFunction*)ptr;
Janet argv[2] = { janet_cstringv(pattern),
janet_cstringv(string), };
Janet res = janet_call(fun, 2, argv);
if (janet_keyeq(res, "match")) {
return CURL_FNMATCHFUNC_MATCH;
} else if (janet_keyeq(res, "nomatch")) {
return CURL_FNMATCHFUNC_NOMATCH;
} else if (janet_keyeq(res, "fail")) {
return CURL_FNMATCHFUNC_FAIL;
}
return CURL_FNMATCHFUNC_FAIL;
}
static int prereq_callback(void *clientp,
char *conn_primary_ip,
char *conn_local_ip,
int conn_primary_port,
int conn_local_port) {
JanetFunction *fun = (JanetFunction*)clientp;
Janet argv[4] = { janet_cstringv(conn_primary_ip),
janet_cstringv(conn_local_ip),
janet_wrap_integer(conn_primary_port),
janet_wrap_integer(conn_local_port), };
Janet res = janet_call(fun, 4, argv);
return janet_truthy(res);
}
CURLcode jurl_setcallback(jurl_handle *jurl, CURLoption opt, JanetFunction *fun) {
CURLcode res = 0; // we |= it so just check for != CURLE_OK
switch (opt) {
case CURLOPT_WRITEFUNCTION: // buffer -> number | any
res |= curl_easy_setopt(jurl->handle, CURLOPT_WRITEDATA, fun);
res |= curl_easy_setopt(jurl->handle, CURLOPT_WRITEFUNCTION, write_callback);
break;
case CURLOPT_READFUNCTION: // bytes -> buffer | string | nil
res |= curl_easy_setopt(jurl->handle, CURLOPT_READDATA, fun);
res |= curl_easy_setopt(jurl->handle, CURLOPT_READFUNCTION, read_callback);
break;
case CURLOPT_XFERINFOFUNCTION: // dltotal, dlnow, ultotal, ulnow -> boolean
res |= curl_easy_setopt(jurl->handle, CURLOPT_XFERINFODATA, fun);
res |= curl_easy_setopt(jurl->handle, CURLOPT_XFERINFOFUNCTION, progress_callback);
break;
case CURLOPT_HEADERFUNCTION: // string -> void
res |= curl_easy_setopt(jurl->handle, CURLOPT_HEADERDATA, fun);
res |= curl_easy_setopt(jurl->handle, CURLOPT_HEADERFUNCTION, header_callback);
break;
case CURLOPT_DEBUGFUNCTION:
// curl*,
// :text | :header-in | :header-out | :data-in | :data-out |
// :ssl-data-in | :ssl-data-out | :end,
// string (non-cstring) -> void (0)
res |= curl_easy_setopt(jurl->handle, CURLOPT_DEBUGDATA, fun);
res |= curl_easy_setopt(jurl->handle, CURLOPT_DEBUGFUNCTION, debug_callback);
break;
case CURLOPT_CHUNK_DATA:
janet_panic("chunk callbacks not implemented");
break;
case CURLOPT_FNMATCH_FUNCTION:
// input, pattern -> :match | :nomatch | :fail
res |= curl_easy_setopt(jurl->handle, CURLOPT_FNMATCH_DATA, fun);
res |= curl_easy_setopt(jurl->handle, CURLOPT_FNMATCH_FUNCTION, fnmatch_callback);
break;
case CURLOPT_PREREQFUNCTION:
// remote ip, local ip, remote port, local port -> boolean
res |= curl_easy_setopt(jurl->handle, CURLOPT_PREREQDATA, fun);
res |= curl_easy_setopt(jurl->handle, CURLOPT_PREREQFUNCTION, prereq_callback);
break;
default:
janet_panic("unknown callback option in jurl_setcallback");
}
return res;
}
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