Add retry option

r.in.wcs.worker/r.in.wcs.worker.py

@@ -3,11 +3,11 @@
 ############################################################################
 #
 # MODULE:      r.in.wcs.worker
-# AUTHOR(S):   Anika Weinmann
+# AUTHOR(S):   Anika Weinmann, Lina Krisztian
 #
 # PURPOSE:     Worker addon of r.in.wcs which imports GetCoverage from a WCS
 #              server via requests
-# COPYRIGHT:   (C) 2023 by Anika Weinmann, mundialis GmbH & Co. KG and the
+# COPYRIGHT:   (C) 2023-2024 by Anika Weinmann, mundialis GmbH & Co. KG and the
 #              GRASS Development Team
 #
 #  This program is free software; you can redistribute it and/or modify
@@ -83,12 +83,22 @@
 # % label: Type for subset settings e.g. "Lat Long"
 # %end
 
+# %option
+# % key: num_retry
+# % type: integer
+# % required: no
+# % answer: 0
+# % multiple: no
+# % label: Maximum number of download retries
+# %end
+
 # %rules
 # % collective: username,password
 # %end
 
 import atexit
 import os
+from time import sleep
 import sys
 
 from urllib.request import urlretrieve
@@ -99,6 +109,7 @@
 
 try:
     from grass_gis_helpers.mapset import switch_to_new_mapset
+    from grass_gis_helpers.validation import get_gdalinfo_returncodes
 except ImportError:
     grass.fatal(
         _(
@@ -144,6 +155,7 @@ def main():
     wcs_url = options["url"]
     coverageid = options["coverageid"]
     area = f"{options['area']}@{old_mapset}"
+    num_retry_max = int(options["num_retry"])
 
     # setting region to area
     grass.run_command("g.region", vector=area, res=res)
@@ -161,10 +173,53 @@ def main():
     os.remove(tif)
     tif = tif.replace(".0", ".tif")
     RM_FILES.append(tif)
-    try:
-        urlretrieve(url, tif)
-    except URLError:
-        grass.fatal(_(f"Failed to reach the server.\nURL: {url}"))
+
+    num_retry = 0
+    while num_retry <= num_retry_max:
+        try:
+            urlretrieve(url, tif)
+            gdalinfo_err, gdalinfo_returncode = get_gdalinfo_returncodes(tif)
+            if (
+                gdalinfo_returncode != 0
+                or ("TIFFReadEncodedStrip" in gdalinfo_err)
+                or ("TIFFReadEncodedTile" in gdalinfo_err)
+            ):
+                if num_retry == num_retry_max:
+                    grass.fatal(
+                        _(
+                            "Failed to download tif after "
+                            f"{num_retry_max} retries."
+                        )
+                    )
+                grass.warning(
+                    _(
+                        f"Broken tif downloaded, with error {gdalinfo_err}."
+                        " Try to re-download. Retry "
+                        f"{num_retry}/{num_retry_max} ..."
+                    )
+                )
+                sleep(5)
+                os.remove(tif)
+                num_retry += 1
+            else:
+                break
+        except URLError as e:
+            if num_retry == num_retry_max:
+                grass.fatal(
+                    _(
+                        f"Failed to reach the server.\nURL: {url} "
+                        f"after {num_retry_max} retries."
+                    )
+                )
+            grass.warning(
+                _(
+                    f"Failed to reach the server.\nURL: {url}. With Error {e}. "
+                    f"Retry {num_retry}/{num_retry_max} ..."
+                )
+            )
+            sleep(5)
+            num_retry += 1
+
     grass.run_command("r.import", input=tif, output=options["output"])
     grass.message(
         _(f"WCS Coverage {coverageid} is impored as {options['output']}")

r.in.wcs/r.in.wcs.py

@@ -73,6 +73,15 @@
 # % description: If it is to large the download can fail; The download is depending on the tile_size and the resoulution of the coverage.
 # %end
 
+# %option
+# % key: num_retry
+# % type: integer
+# % required: no
+# % answer: 0
+# % multiple: no
+# % label: Maximum number of download retries
+# %end
+
 # %option G_OPT_M_NPROCS
 # % description: Number of cores for multiprocessing, -2 is the number of available cores - 1
 # % answer: -2
@@ -188,6 +197,7 @@ def main():
             "subset_type": axis_label,
             "username": options["username"],
             "password": options["password"],
+            "num_retry": options["num_retry"],
         }
         # create tiles
         tmp_id = grass.tempname(12)