Improve Python API. Add MemoryStream class.

* python/libmu_py/sieve.c (api_sieve_machine_init): Improve.
(api_sieve_machine_error_text): Add new function.
* python/libmu_py/stream.c (api_memory_stream_create): Likewise.
(api_stream_to_message): Likewise.
* python/mailutils/error.py (Error): Add optional str_error argument.
* python/mailutils/sieve.py: Update.
* python/mailutils/stream.py (to_message): Add new method.
(MemoryStream): Add new class.

@@ -94,15 +94,61 @@ api_sieve_machine_init (PyObject *self, PyObject *args)
 {
   int status;
   PySieveMachine *py_mach;
-
+  mu_stream_t str, estr;
+  
   if (!PyArg_ParseTuple (args, "O!", &PySieveMachineType, &py_mach))
     return NULL;
 
-  status = mu_sieve_machine_init (&py_mach->mach);
+  status = mu_memory_stream_create (&str, MU_STREAM_RDWR);
+  if (status)
+    return _ro (PyInt_FromLong (status));
+  status = mu_log_stream_create (&estr, str);
+  mu_stream_unref (str);
+  if (status)
+    return _ro (PyInt_FromLong (status));
+  
+  status = mu_sieve_machine_init_ex (&py_mach->mach, NULL, estr);
+  mu_stream_unref (estr);
   return _ro (PyInt_FromLong (status));
 }
 
 static PyObject *
+api_sieve_machine_error_text (PyObject *self, PyObject *args)
+{
+  int status;
+  PySieveMachine *py_mach;
+  mu_stream_t estr;
+  mu_transport_t trans[2];
+  PyObject *retval;
+  size_t length = 0;
+  
+  if (!PyArg_ParseTuple (args, "O!", &PySieveMachineType, &py_mach))
+    return NULL;
+  if (!py_mach->mach)
+    PyErr_SetString (PyExc_RuntimeError, "Uninitialized Sieve machine");
+      
+  mu_sieve_get_diag_stream (py_mach->mach, &estr);
+  status = mu_stream_ioctl (estr, MU_IOCTL_TRANSPORT, MU_IOCTL_OP_GET,
+			    trans);
+  if (status == 0)
+    {
+      mu_stream_t str = (mu_stream_t) trans[0];
+
+      mu_stream_size (str, &length);
+      status = mu_stream_ioctl (str, MU_IOCTL_TRANSPORT, MU_IOCTL_OP_GET,
+				trans);
+      mu_stream_truncate (str, 0);
+    }
+  
+  if (status)
+    PyErr_SetString (PyExc_RuntimeError, mu_strerror (status));
+  retval = PyString_FromStringAndSize ((char*) trans[0], length);
+
+  mu_stream_unref (estr);
+  return _ro (retval);
+}
+
+static PyObject *
 api_sieve_machine_destroy (PyObject *self, PyObject *args)
 {
   PySieveMachine *py_mach;
@@ -110,12 +156,13 @@ api_sieve_machine_destroy (PyObject *self, PyObject *args)
   if (!PyArg_ParseTuple (args, "O!", &PySieveMachineType, &py_mach))
     return NULL;
 
-  if (py_mach->mach) {
-    struct _mu_py_sieve_logger *s = mu_sieve_get_data (py_mach->mach);
-    if (s)
-      free (s);
-    mu_sieve_machine_destroy (&py_mach->mach);
-  }
+  if (py_mach->mach)
+    {
+      struct _mu_py_sieve_logger *s = mu_sieve_get_data (py_mach->mach);
+      if (s)
+	free (s);
+      mu_sieve_machine_destroy (&py_mach->mach);
+    }
   return _ro (Py_None);
 }
 
@@ -280,6 +327,9 @@ static PyMethodDef methods[] = {
   { "machine_destroy", (PyCFunction) api_sieve_machine_destroy, METH_VARARGS,
     "Destroy Sieve 'machine'." },
 
+  { "errortext", (PyCFunction) api_sieve_machine_error_text, METH_VARARGS,
+    "Return the most recent error description." },
+  
   { "compile", (PyCFunction) api_sieve_compile, METH_VARARGS,
     "Compile the sieve script from the file 'name'." },
 

@@ -126,6 +126,25 @@ api_stdio_stream_create (PyObject *self, PyObject *args)
 }
 
 static PyObject *
+api_memory_stream_create (PyObject *self, PyObject *args)
+{
+  int status;
+  char *s;
+  PyStream *py_stm;
+
+  if (!PyArg_ParseTuple (args, "O!s", &PyStreamType, &py_stm, &s))
+    return NULL;
+
+  status = mu_memory_stream_create (&py_stm->stm, MU_STREAM_RDWR);
+  if (status == 0)
+    {
+      status = mu_stream_write (py_stm->stm, s, strlen (s), NULL);
+      mu_stream_seek (py_stm->stm, MU_SEEK_SET, 0, NULL);
+    }
+  return _ro (PyInt_FromLong (status));
+}
+
+static PyObject *
 api_prog_stream_create (PyObject *self, PyObject *args)
 {
   int status, flags;
@@ -317,6 +336,22 @@ api_stream_readline (PyObject *self, PyObject *args)
   return _ro (py_ret);
 }
 
+static PyObject *
+api_stream_to_message (PyObject *self, PyObject *args)
+{
+  int status;
+  PyStream *py_stm;
+  PyMessage *py_msg = PyMessage_NEW ();
+
+  if (!PyArg_ParseTuple (args, "O!", &PyStreamType, &py_stm))
+    return NULL;
+
+  Py_INCREF (py_msg);
+
+  status = mu_stream_to_message (py_stm->stm, &py_msg->msg);
+  return status_object (status, (PyObject *)py_msg);
+}
+
 static PyMethodDef methods[] = {
   { "tcp_stream_create", (PyCFunction) api_tcp_stream_create, METH_VARARGS,
     "" },
@@ -327,6 +362,10 @@ static PyMethodDef methods[] = {
   { "stdio_stream_create", (PyCFunction) api_stdio_stream_create, METH_VARARGS,
     "" },
 
+  { "memory_stream_create",
+    (PyCFunction) api_memory_stream_create, METH_VARARGS,
+    "" },
+
   { "prog_stream_create", (PyCFunction) api_prog_stream_create, METH_VARARGS,
     "" },
 
@@ -364,6 +403,9 @@ static PyMethodDef methods[] = {
   { "readline", (PyCFunction) api_stream_readline, METH_VARARGS,
     "" },
 
+  { "to_message", (PyCFunction) api_stream_to_message, METH_VARARGS,
+    "" },
+
   { NULL, NULL, 0, NULL }
 };
 

@@ -22,9 +22,9 @@ def strerror (status):
     return error.strerror (status)
 
 class Error (Exception):
-    def __init__ (self, status):
+    def __init__ (self, status, str_error=None):
         self.status = status
-        self.strerror = strerror (status)
+        self.strerror = str_error or strerror (status)
     def __str__ (self):
         return "%d: %s" % (self.status, self.strerror)
 

@@ -26,6 +26,9 @@ class Machine:
             raise SieveMachineError (status)
 
     def __del__ (self):
+        s = sieve.errortext (self.mach)
+        if s:
+            raise SieveMachineError (MU_ERR_FAILURE, s)
         sieve.machine_destroy (self.mach)
         del self.mach
 
@@ -38,7 +41,7 @@ class Machine:
         """Compile the sieve script from the file 'name'."""
         status = sieve.compile (self.mach, name)
         if status:
-            raise SieveMachineError (status)
+            raise SieveMachineError (status, sieve.errortext (self.mach))
 
     def disass (self):
         """Dump the disassembled code of the sieve machine."""
@@ -58,4 +61,4 @@ class Machine:
         over the 'msg'."""
         status = sieve.message (self.mach, msg.msg)
         if status:
-            raise SieveMachineError (status)
+            raise SieveMachineError (status, sieve.errortext (self.mach))

@@ -103,6 +103,13 @@ class Stream:
             raise StreamError (status)
         return rbuf
 
+    def to_message (self):
+        from mailutils import message
+        status, msg = stream.to_message (self.stm)
+        if status:
+            raise StreamError (status)
+        return message.Message (msg)
+
 class TcpStream (Stream):
     def __init__ (self, host, port, flags=MU_STREAM_READ):
         Stream.__init__ (self)
@@ -124,6 +131,13 @@ class StdioStream (Stream):
         if status:
             raise StreamError (status)
 
+class MemoryStream (Stream):
+    def __init__ (self, s):
+        Stream.__init__ (self)
+        status = stream.memory_stream_create (self.stm, s)
+        if status:
+            raise StreamError (status)
+
 class ProgStream (Stream):
     def __init__ (self, progname, flags=MU_STREAM_READ):
         Stream.__init__ (self)