issue #693 add search for schema and find parameters from the backend

openeo/internal/processes/parse.py

@@ -127,6 +127,12 @@ def from_json_file(cls, path: Union[str, Path]) -> Process:
         with Path(path).open("r") as f:
             return cls.from_json(f.read())
 
+    def get_parameter(self, parameter_id: str) -> Union[dict, list]:
+        for parameter in self.parameters:
+            if parameter.name == parameter_id:
+                return parameter.schema.schema
+        raise LookupError(f"Expected parameter {parameter_id} not found.")
+
 
 def parse_all_from_dir(path: Union[str, Path], pattern="*.json") -> Iterator[Process]:
     """Parse all openEO process files in given directory"""

openeo/rest/connection.py

@@ -1067,28 +1067,6 @@ def describe_process(self, id: str, namespace: Optional[str] = None) -> dict:
 
         raise OpenEoClientException("Process does not exist.")
 
-    def get_schema_from_process_parameter(
-        self, process_id: str, parameter_id: str, namespace: Optional[str] = None
-    ) -> Union[dict, list]:
-        """
-        Returns schema of the parameter of the process from the back end.
-
-        :param process_id: The id of the process.
-        :param parameter_id: The id of the parameter.
-        :param namespace: The namespace of the process.
-
-        :return: schema of the parameter in the process.
-        """
-        processes = self.list_processes(namespace)
-        for process in processes:
-            if process["id"] == process_id:
-                schema = Process.from_dict(process)
-                for parameter in schema.parameters:
-                    if parameter.name == parameter_id:
-                        return parameter.schema.schema
-                raise OpenEoClientException("Parameter does not exist.")
-        raise OpenEoClientException("Process does not exist.")
-
     def list_jobs(self, limit: Union[int, None] = None) -> List[dict]:
         """
         Lists all jobs of the authenticated user.

openeo/rest/datacube.py

@@ -35,6 +35,7 @@
     convert_callable_to_pgnode,
     get_parameter_names,
 )
+from openeo.internal.processes.parse import Process
 from openeo.internal.warnings import UserDeprecationWarning, deprecated, legacy_alias
 from openeo.metadata import (
     Band,
@@ -2739,10 +2740,19 @@ def sar_backscatter(
         .. versionadded:: 0.4.9
         .. versionchanged:: 0.4.10 replace `orthorectify` and `rtc` arguments with `coefficient`.
         """
-        coefficient_options = [None]
-        if self.connection:
-            schema = self.connection.get_schema_from_process_parameter("sar_backscatter", "coefficient")
-            coefficient_options += search_list_for_dict_key(schema, "enum")
+        try:
+            schema = Process.from_dict(self.connection.describe_process("sar_backscatter")).get_parameter("coefficient")
+            coefficient_options = search_list_for_dict_key(schema, "enum") + [None]
+        except Exception:
+            log.warning(f"Failed to extract option for coefficient in sar_backscatter")
+            coefficient_options = [
+                "beta0",
+                "sigma0-ellipsoid",
+                "sigma0-terrain",
+                "gamma0-ellipsoid",
+                "gamma0-terrain",
+                None,
+            ]
         if coefficient not in coefficient_options:
             raise OpenEoClientException("Invalid `sar_backscatter` coefficient {c!r}. Should be one of {o}".format(
                 c=coefficient, o=coefficient_options

tests/rest/test_connection.py

@@ -2874,31 +2874,6 @@ def test_list_processes_namespace(requests_mock):
     assert m.call_count == 1
 
 
-def test_get_schema_from_process_parameter(requests_mock):
-    requests_mock.get(API_URL, json={"api_version": "1.0.0"})
-    processes = [
-        {
-            "id": "incr",
-            "description": "Increment a value",
-            "summary": "Increment a value",
-            "parameters": [{"name": "x", "description": "value", "schema": {"type": "integer"}}],
-            "returns": {"description": "incremented value", "schema": {"type": "integer"}},
-        },
-        {
-            "id": "pi",
-            "description": "Pi",
-            "summary": "Pi",
-            "parameters": [],
-            "returns": {"description": "value of pi", "schema": {"type": "number"}},
-        },
-    ]
-    m = requests_mock.get(API_URL + "processes", json={"processes": processes})
-    conn = Connection(API_URL)
-    assert conn.list_processes() == processes
-    schema = conn.get_schema_from_process_parameter("incr", "x")
-    assert schema == {"type": "integer"}
-
-
 def test_get_job(requests_mock):
     requests_mock.get(API_URL, json={"api_version": "1.0.0"})
     conn = Connection(API_URL)