not yet working coroutines

README.md

@@ -104,8 +104,8 @@ To create new sessions for HTTP requests, use the `libcurl.HTTPSession` class. T
 - `options` - An optional object with various settings.
 
 The valid HTTP session settings are:
-- `enable_cookies` - A boolean which indicate whether or not cookies should be persisted within the session.
+- `enable_cookies` - A boolean which indicate whether or not cookies should be persisted within the session. NOT IMPLEMENTED YET
-- `cookie_jar` - A blob containing the data in the cookie jar file. This should have been exported from a previous session. 
+- `cookie_jar` - A blob containing the data in the cookie jar file. This should have been exported from a previous session. NOT IMPLEMENTED YET
 
 ### Creating WebSocket Connections:
 To use WebSockets, create a `libcurl.CurlWebSocket` object, which takes the following arguments:

client/build.sh

@@ -27,8 +27,8 @@ EXPORTED_FUNCS="${EXPORTED_FUNCS:1}"
 
 #compile options
 RUNTIME_METHODS="addFunction,removeFunction,allocate,ALLOC_NORMAL"
-COMPILER_OPTIONS="-o $MODULE_FILE -lcurl -lssl -lcrypto -lcjson -lz -lbrotlidec -lbrotlicommon -lnghttp2 -I $INCLUDE_DIR -L $LIB_DIR"
+COMPILER_OPTIONS="-o $MODULE_FILE -lcurl -lssl -lcrypto -lcjson -lz -lbrotlidec -lbrotlicommon -lnghttp2 -I $INCLUDE_DIR -L $LIB_DIR -Wl,--wrap=poll"
-EMSCRIPTEN_OPTIONS="-lwebsocket.js -sENVIRONMENT=worker,web -sASSERTIONS=1 -sLLD_REPORT_UNDEFINED -sALLOW_TABLE_GROWTH -sALLOW_MEMORY_GROWTH -sEXPORTED_FUNCTIONS=$EXPORTED_FUNCS -sEXPORTED_RUNTIME_METHODS=$RUNTIME_METHODS"
+EMSCRIPTEN_OPTIONS="-lwebsocket.js -sASYNCIFY -sENVIRONMENT=worker,web -sASSERTIONS=1 -sLLD_REPORT_UNDEFINED -sALLOW_TABLE_GROWTH -sALLOW_MEMORY_GROWTH -sEXPORTED_FUNCTIONS=$EXPORTED_FUNCS -sEXPORTED_RUNTIME_METHODS=$RUNTIME_METHODS"
 
 #clean output dir
 rm -rf $OUT_DIR

client/javascript/ftp.js

@@ -3,7 +3,7 @@ class FTPSession extends CurlSession {
     if (!url.startsWith("ftp://") && !url.startsWith("ftps://")) {
       throw "invalid url protocol";
     }
-    super();
+    super(1);
 
     this.url = url;
     this.options = options;

client/javascript/session.js

@@ -1,9 +1,8 @@
 class CurlSession {
-  constructor(options={}) {
+  constructor(need_fiber=0) {
     check_loaded(true);
 
-    this.options = options;
+    this.session_ptr = _session_create(need_fiber);
-    this.session_ptr = _session_create();
     this.active_requests = 0;
     this.event_loop = null;
     this.requests_list = [];

client/libcurl/session.c

@@ -1,4 +1,5 @@
 #include <stdlib.h>
+#include <poll.h>
 
 #include "curl/multi.h"
 #include "curl/curl.h"
@@ -6,15 +7,24 @@
 #include "types.h"
 #include "request.h"
 #include "util.h"
+#include "context.h"
 
-struct SessionInfo* session_create() {
+#define MINICORO_IMPL
+#include "minicoro.h"
+
+struct SessionInfo* running_session;
+
+struct SessionInfo* session_create(int need_fiber) {
   struct SessionInfo *session = malloc(sizeof(struct SessionInfo));
   session->multi_handle = curl_multi_init();
   session->request_active = 0;
+  session->need_fiber = need_fiber;
+  session->fiber_running = 0;
+  session->fiber = NULL;
   return session;
 }
 
-void session_perform(struct SessionInfo *session) {
+void session_thread(struct SessionInfo *session) {
   CURLMcode mc;
   session->request_active = 0;
   mc = curl_multi_perform(session->multi_handle, &session->request_active);
@@ -25,6 +35,68 @@ void session_perform(struct SessionInfo *session) {
   if (curl_msg && curl_msg->msg == CURLMSG_DONE) {
     finish_request(curl_msg);
   }
+
+  //suspend the coroutine if there are no requests active
+  if (session->need_fiber && !session->request_active) {
+    mco_yield(mco_running());
+  }
+}
+
+void session_thread_wrapper(mco_coro* fiber) {
+  //infinitely loop here so we don't need to keep remaking the coroutine
+  while (1) {
+    session_thread(fiber->user_data);
+  }
+}
+
+void session_perform(struct SessionInfo *session) {
+  running_session = session;
+  if (!session->need_fiber) {
+    session_thread(session);
+    return;
+  }
+
+  //create a new coroutine if there isn't one running already
+  mco_coro* fiber;
+  if (!session->fiber_running) {
+    mco_desc desc = mco_desc_init(session_thread_wrapper, 0);
+    desc.user_data = session;
+    mco_result res = mco_create(&fiber, &desc);
+  }
+  else {
+    fiber = session->fiber;
+  }
+  
+  if (mco_status(fiber) == MCO_SUSPENDED) {
+    printf("fiber suspended \n");
+  }
+  if (mco_status(fiber) == MCO_DEAD) {
+    printf("fiber dead \n");
+  }
+  if (mco_status(fiber) == MCO_NORMAL) {
+    printf("fiber normal \n");
+  }
+
+  //swich contexts into coroutine
+  session->fiber_running = 1;
+  mco_resume(fiber);
+}
+
+
+//wrap the poll function
+//we want to switch contexts when curl is polling the socket
+extern int __real_poll(struct pollfd *fds, nfds_t nfds, int timeout);
+int __wrap_poll(struct pollfd *fds, nfds_t nfds, int timeout) {
+  int ret = __real_poll(fds, nfds, timeout);
+
+  //don't switch contexts if there is activity on the socket
+  if (!running_session->need_fiber || ret != 0) {
+    return ret;
+  }
+
+  //perform the context switch if there is nothing on the socket
+  mco_yield(mco_running());
+  return ret;
 }
 
 void session_set_options(struct SessionInfo *session, int connections_limit, int cache_limit) {
@@ -49,4 +121,9 @@ void session_remove_request(struct SessionInfo *session, CURL* http_handle) {
 
 void session_cleanup(struct SessionInfo *session) {
   curl_multi_cleanup(session->multi_handle);
+
+  if (session->fiber != NULL) 
+    mco_destroy(session->fiber);
+
+  free(session);
 }

client/libcurl/types.h

@@ -1,4 +1,5 @@
 #include "curl/curl.h"
+#include "minicoro.h"
 
 typedef void(*DataCallback)(char* chunk_ptr, int chunk_size);
 typedef void(*EndCallback)(int error);
@@ -24,4 +25,7 @@ struct WSResult {
 struct SessionInfo {
   CURLM* multi_handle;
   int request_active;
+  int need_fiber;
+  int fiber_running;
+  mco_coro* fiber;
 };

client/tools/all_deps.sh

@@ -11,6 +11,7 @@ CURL_PREFIX=$(realpath build/curl-wasm)
 ZLIB_PREFIX=$(realpath build/zlib-wasm)
 BROTLI_PREFIX=$(realpath build/brotli-wasm)
 NGHTTP2_PREFIX=$(realpath build/nghttp2-wasm)
+MINICORO_PREFIX=$(realpath build/minicoro-wasm)
 
 if [ ! -d $OPENSSL_PREFIX ]; then
   tools/openssl.sh
@@ -30,9 +31,13 @@ fi
 if [ ! -d $CURL_PREFIX ]; then
   tools/curl.sh
 fi
+if [ ! -d $MINICORO_PREFIX ]; then
+  tools/minicoro.sh
+fi
 
 cp -r $OPENSSL_PREFIX/* $CURL_PREFIX
 cp -r $CJSON_PREFIX/* $CURL_PREFIX
 cp -r $ZLIB_PREFIX/* $CURL_PREFIX
 cp -r $BROTLI_PREFIX/* $CURL_PREFIX
-cp -r $NGHTTP2_PREFIX/* $CURL_PREFIX
+cp -r $NGHTTP2_PREFIX/* $CURL_PREFIX
+cp -r $MINICORO_PREFIX/* $CURL_PREFIX

client/tools/minicoro.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+#download the minicoro library
+
+mkdir -p build/minicoro-wasm/include/
+wget "https://raw.githubusercontent.com/edubart/minicoro/main/minicoro.h" -O build/minicoro-wasm/include/minicoro.h