process dev

xexe/processes.py

@@ -57,13 +57,43 @@ def run_get_rates(
 ) -> None:
     logger.info("Getting rates")
 
-    # Create process log object to track everything
-    # Get rates
-    ## Derive API calls to run from passed inputs
-    ## Get hold of proper API client depending on whether we are dry running or acting serious
-    ## Do our thing and get rates or die tryin'
-    # Output
-    ## Create proper output writer depending on parameters
-    ## Check writeability
-    ## Do our thing and output or die tryin'
-    # Call it a day
+    process_state = GetRatesProcessState(output=output)
+
+    rates_fetcher = get_rates_fetcher(process_state.fetcher_type)
+
+    try:
+        rates = rates_fetcher.fetch()
+    except Exception as e:
+        process_state.record_rate_fetching_error(e)
+        raise ConnectionError(f"Could not fetch rates. See logs.")
+
+    rates_writer = get_rates_writer(process_state.output_type)
+
+    try:
+        rates_writer.write(rates)
+    except Exception as e:
+        process_state.record_rate_writing_error(e)
+        raise Exception(f"Could not write rates. See logs.")
+
+
+class GetRatesProcessState:
+    def __init__(self, output: str, dry_run: bool) -> None:
+        self.writer_type = self._infer_writer_type(output)
+        self.fetcher_type = self._infer_fetcher_type(dry_run)
+
+    @staticmethod
+    def _infer_writer_type(output: str) -> str:
+        output_is_csv_file_path = bool(pathlib.Path(output).suffix == ".csv")
+
+        if output_is_csv_file_path:
+            return "csv_file"
+
+        raise ValueError(f"Don't know how to handle passed output: {output}")
+
+    @staticmethod
+    def _infer_fetcher_type(dry_run: bool) -> str:
+        if dry_run:
+            return MockFetcher
+
+        if not dry_run:
+            return XEFetcher