context: add explicit_compile option

Today, loading modules in a context is very slow, because each time a
module is added, the whole schema is recompiled. Libyang has a flag to
defer the compilation later, when ly_ctx_compile is used. Let's expose
this feature.

Signed-off-by: Samuel Gauthier <samuel.gauthier@6wind.com>

Author: samuel-gauthier

cffi/cdefs.h

@@ -205,6 +205,7 @@ struct lys_module* ly_ctx_load_module(struct ly_ctx *, const char *, const char
 struct lys_module* ly_ctx_get_module(const struct ly_ctx *, const char *, const char *);
 struct lys_module* ly_ctx_get_module_iter(const struct ly_ctx *, uint32_t *);
 struct lys_module* ly_ctx_get_module_latest(const struct ly_ctx *, const char *);
+LY_ERR ly_ctx_compile(struct ly_ctx *);
 
 LY_ERR lys_find_xpath(const struct ly_ctx *, const struct lysc_node *, const char *, uint32_t, struct ly_set **);
 void ly_set_free(struct ly_set *, void(*)(void *obj));

libyang/context.py

@@ -28,6 +28,7 @@ def __init__(
         self,
         search_path: Optional[str] = None,
         disable_searchdir_cwd: bool = True,
+        explicit_compile: Optional[bool] = False,
         yanglib_path: Optional[str] = None,
         yanglib_fmt: str = "json",
         cdata=None,  # C type: "struct ly_ctx *"
@@ -39,6 +40,8 @@ def __init__(
         options = 0
         if disable_searchdir_cwd:
             options |= lib.LY_CTX_DISABLE_SEARCHDIR_CWD
+        if explicit_compile:
+            options |= lib.LY_CTX_EXPLICIT_COMPILE
         # force priv parsed
         options |= lib.LY_CTX_SET_PRIV_PARSED
 
@@ -79,6 +82,11 @@ def __init__(
         if not self.cdata:
             raise self.error("cannot create context")
 
+    def compile_schema(self):
+        ret = lib.ly_ctx_compile(self.cdata)
+        if ret != lib.LY_SUCCESS:
+            raise self.error("could not compile schema")
+
     def get_yanglib_data(self, content_id_format=""):
         dnode = ffi.new("struct lyd_node **")
         ret = lib.ly_ctx_get_yanglib_data(self.cdata, dnode, str2c(content_id_format))