ECC-2108: Implement a way of switching off error output to 'stderr'

Author: shahramn

CHANGELOG.rst

@@ -5,6 +5,7 @@ Changelog for eccodes-python
 2.43.0 (2025-mm-dd)
 --------------------
 
+- ECC-2108: Implement a way of switching off error output to 'stderr'
 - GitHub pull request #129: Update MemoryReader to read more than one field
 
 

eccodes/eccodes.py

@@ -61,6 +61,7 @@
 )
 from gribapi import grib_clone as codes_clone
 from gribapi import grib_context_delete as codes_context_delete
+from gribapi import grib_context_set_logging as codes_context_set_logging
 from gribapi import grib_copy_namespace as codes_copy_namespace
 from gribapi import grib_count_in_file as codes_count_in_file
 from gribapi import grib_find_nearest as codes_grib_find_nearest
@@ -371,6 +372,7 @@
     "codes_skip_read_only",
     "codes_write",
     "codes_context_delete",
+    "codes_context_set_logging",
     "CodesInternalError",
     "ConceptNoMatchError",
     "ConstantFieldError",

gribapi/grib_api.h

@@ -139,6 +139,7 @@ void grib_multi_support_on(grib_context* c);
 void grib_multi_support_off(grib_context* c);
 void grib_multi_support_reset_file(grib_context* c, FILE* f);
 long grib_get_api_version(void);
+void grib_context_set_logging_file(grib_context* c, FILE* f);
 
 char* grib_samples_path(const grib_context *c);
 char* grib_definition_path(const grib_context *c);

gribapi/gribapi.py

@@ -464,6 +464,12 @@ def grib_multi_support_reset_file(fileobj):
     lib.grib_multi_support_reset_file(context, fileobj)
 
 
+@require(fileobj=file)
+def grib_context_set_logging(fileobj):
+    context = lib.grib_context_get_default()
+    lib.grib_context_set_logging_file(context, fileobj)
+
+
 @require(msgid=int)
 def grib_release(msgid):
     """

tests/test_eccodes.py

@@ -15,6 +15,7 @@
 
 import math
 import os.path
+import sys
 
 import numpy as np
 import pytest
@@ -115,6 +116,20 @@ def test_codes_get_native_type():
         eccodes.codes_get_native_type(0, "aKey")  # NULL handle
 
 
+def test_set_logging_file():
+    if eccodes.codes_get_api_version(int) < 24300:
+        pytest.skip("ecCodes version too old")
+
+    nullDeviceFile = "/dev/null"
+    with open(nullDeviceFile, "w") as fnull:
+        eccodes.codes_context_set_logging(fnull)
+        with pytest.raises(eccodes.FileNotFoundError):
+            eccodes.codes_grib_new_from_samples("Silenced")
+        eccodes.codes_context_set_logging(sys.stderr)
+        with pytest.raises(eccodes.FileNotFoundError):
+            eccodes.codes_grib_new_from_samples("Restored")
+
+
 def test_new_from_file():
     fpath = get_sample_fullpath("GRIB2.tmpl")
     if fpath is None: