Catch exception.

lib/Curl.toffee

@@ -42,28 +42,37 @@ Curl.user_options =
   RAW: 'RAW'
   DEBUG: 'DEBUG'
 
+id = 0
+curls = {}
+
 # on 'data' must be returns the chunk length
 Curl::on = (event, callback) ->
   switch event
     when 'data'
       # (Buffer chunk) ->
-      @on_write = callback
+      @on_write = (chunk) =>
+        callback.call @, chunk
     when 'error'
       # (Error error) ->
-      @on_error = callback
+      @on_error = (e) =>
+        delete curls[@id]
+        callback.call @, e
     when 'end'
       # () ->
-      @on_end = callback
+      @on_end = =>
+        delete curls[@id]
+        callback.call @
     else
       throw new Error("invalid event type #{event}")
   @
 
 Curl::close = () ->
+  delete curls[@id]
   @close_()
 
-id = 0
 Curl::perform = ->
   @id = ++id
+  curls[@id] = @
   @perform_()
   Curl.process()
   @