Skip tasks or error out when resources are missing

- If tasks are selected with --task or --task-filter and a needed
  resource is missing, we now error out.
- If tasks are not specifically selected, we now only run tasks for
  which resources are available (and error out if no resources exist
  at all)
- If --allow-missing-resources is passed, we skip both above checks
  and do historical behavior of running any given task with zero input
  rows (which pushes up a schema, cleans up the delta lake, and stamps
  the resource as complete in the completion tracking tables).

cumulus_etl/errors.py

@@ -34,6 +34,7 @@
 SERVICE_MISSING = 33  # generic init-check service is missing
 COMPLETION_ARG_MISSING = 34
 TASK_HELP = 35
+MISSING_REQUESTED_RESOURCES = 36
 
 
 class FatalError(Exception):

cumulus_etl/etl/cli.py

@@ -2,10 +2,10 @@
 
 import argparse
 import datetime
+import logging
 import os
 import shutil
 import sys
-from collections.abc import Iterable
 
 import rich
 import rich.table
@@ -16,6 +16,9 @@
 from cumulus_etl.etl.config import JobConfig, JobSummary
 from cumulus_etl.etl.tasks import task_factory
 
+TaskList = list[type[tasks.EtlTask]]
+
+
 ###############################################################################
 #
 # Main Pipeline (run all tasks)
@@ -24,7 +27,7 @@
 
 
 async def etl_job(
-    config: JobConfig, selected_tasks: list[type[tasks.EtlTask]], use_philter: bool = False
+    config: JobConfig, selected_tasks: TaskList, use_philter: bool = False
 ) -> list[JobSummary]:
     """
     :param config: job config
@@ -68,7 +71,7 @@ def check_mstool() -> None:
         raise SystemExit(errors.MSTOOL_MISSING)
 
 
-async def check_requirements(selected_tasks: Iterable[type[tasks.EtlTask]]) -> None:
+async def check_requirements(selected_tasks: TaskList) -> None:
     """
     Verifies that all external services and programs are ready
 
@@ -118,6 +121,11 @@ def define_etl_parser(parser: argparse.ArgumentParser) -> None:
     parser.add_argument(
         "--errors-to", metavar="DIR", help="where to put resources that could not be processed"
     )
+    parser.add_argument(
+        "--allow-missing-resources",
+        action="store_true",
+        help="run tasks even if their resources are not present",
+    )
 
     cli_utils.add_aws(parser)
     cli_utils.add_auth(parser)
@@ -143,7 +151,7 @@ def define_etl_parser(parser: argparse.ArgumentParser) -> None:
 
 
 def print_config(
-    args: argparse.Namespace, job_datetime: datetime.datetime, all_tasks: Iterable[tasks.EtlTask]
+    args: argparse.Namespace, job_datetime: datetime.datetime, all_tasks: TaskList
 ) -> None:
     """
     Prints the ETL configuration to the console.
@@ -214,6 +222,49 @@ def handle_completion_args(
     return export_group_name, export_datetime
 
 
+async def check_available_resources(
+    loader: loaders.Loader,
+    *,
+    requested_resources: set[str],
+    args: argparse.Namespace,
+    is_default_tasks: bool,
+) -> set[str]:
+    # Here we try to reconcile which resources the user requested and which resources are actually
+    # available in the input root.
+    # - If the user didn't specify a specific task, we'll scope down the requested resources to
+    #   what is actually present in the input.
+    # - If they did, we'll complain if their required resources are not available.
+    #
+    # Reconciling is helpful for performance reasons (don't need to finalize untouched tables),
+    # UX reasons (can tell user if they made a CLI mistake), and completion tracking (don't
+    # mark a resource as complete if we didn't even export it)
+    if args.allow_missing_resources:
+        return requested_resources
+
+    detected = await loader.detect_resources()
+    if detected is None:
+        return requested_resources  # likely we haven't run bulk export yet
+
+    if missing_resources := requested_resources - detected:
+        for resource in sorted(missing_resources):
+            # Log the same message we would print if in common.py if we ran tasks anyway
+            logging.warning("No %s files found in %s", resource, loader.root.path)
+
+        if is_default_tasks:
+            requested_resources -= missing_resources  # scope down to detected resources
+            if not requested_resources:
+                errors.fatal(
+                    "No supported resources found.",
+                    errors.MISSING_REQUESTED_RESOURCES,
+                )
+        else:
+            msg = "Required resources not found.\n"
+            msg += "Add --allow-missing-resources to run related tasks anyway with no input."
+            errors.fatal(msg, errors.MISSING_REQUESTED_RESOURCES)
+
+    return requested_resources
+
+
 async def etl_main(args: argparse.Namespace) -> None:
     # Set up some common variables
 
@@ -227,6 +278,7 @@ async def etl_main(args: argparse.Namespace) -> None:
     job_datetime = common.datetime_now()  # grab timestamp before we do anything
 
     selected_tasks = task_factory.get_selected_tasks(args.task, args.task_filter)
+    is_default_tasks = not args.task and not args.task_filter
 
     # Print configuration
     print_config(args, job_datetime, selected_tasks)
@@ -261,8 +313,17 @@ async def etl_main(args: argparse.Namespace) -> None:
                 resume=args.resume,
             )
 
+        required_resources = await check_available_resources(
+            config_loader,
+            args=args,
+            is_default_tasks=is_default_tasks,
+            requested_resources=required_resources,
+        )
+        # Drop any tasks that we didn't find resources for
+        selected_tasks = [t for t in selected_tasks if t.resource in required_resources]
+
         # Pull down resources from any remote location (like s3), convert from i2b2, or do a bulk export
-        loader_results = await config_loader.load_all(list(required_resources))
+        loader_results = await config_loader.load_resources(required_resources)
 
         # Establish the group name and datetime of the loaded dataset (from CLI args or Loader)
         export_group_name, export_datetime = handle_completion_args(args, loader_results)

cumulus_etl/etl/tasks/base.py

@@ -260,9 +260,6 @@ def _delete_requested_ids(self):
             self.formatters[index].delete_records(deleted_ids)
 
     def _update_completion_table(self) -> None:
-        # TODO: what about empty sets - do we assume the export gave 0 results or skip it?
-        #  Is there a difference we could notice? (like empty input file vs no file at all)
-
         if not self.completion_tracking_enabled:
             return
 

cumulus_etl/loaders/base.py

@@ -46,7 +46,15 @@ def __init__(self, root: store.Root):
         self.root = root
 
     @abc.abstractmethod
-    async def load_all(self, resources: list[str]) -> LoaderResults:
+    async def detect_resources(self) -> set[str] | None:
+        """
+        Inspect which resources are available for use.
+
+        :returns: the types of resources detected (or None if that can't be determined yet)
+        """
+
+    @abc.abstractmethod
+    async def load_resources(self, resources: set[str]) -> LoaderResults:
         """
         Loads the listed remote resources and places them into a local folder as FHIR ndjson
 

cumulus_etl/loaders/fhir/bulk_export.py

@@ -30,7 +30,7 @@ class BulkExporter:
     def __init__(
         self,
         client: fhir.FhirClient,
-        resources: list[str],
+        resources: set[str],
         url: str,
         destination: str,
         *,
@@ -81,7 +81,7 @@ def format_kickoff_url(
         self,
         url: str,
         *,
-        resources: list[str],
+        resources: set[str],
         since: str | None,
         until: str | None,
         prefer_url_resources: bool,

cumulus_etl/loaders/fhir/ndjson_loader.py

@@ -2,6 +2,8 @@
 
 import tempfile
 
+import cumulus_fhir_support
+
 from cumulus_etl import cli_utils, common, errors, fhir, store
 from cumulus_etl.loaders import base
 from cumulus_etl.loaders.fhir.bulk_export import BulkExporter
@@ -37,7 +39,16 @@ def __init__(
         self.until = until
         self.resume = resume
 
-    async def load_all(self, resources: list[str]) -> base.LoaderResults:
+    async def detect_resources(self) -> set[str] | None:
+        if self.root.protocol in {"http", "https"}:
+            return None  # we haven't done the export yet!
+
+        found_files = cumulus_fhir_support.list_multiline_json_in_dir(
+            self.root.path, fsspec_fs=self.root.fs
+        )
+        return {resource for resource in found_files.values() if resource}
+
+    async def load_resources(self, resources: set[str]) -> base.LoaderResults:
         # Are we doing a bulk FHIR export from a server?
         if self.root.protocol in ["http", "https"]:
             bulk_dir = await self.load_from_bulk_export(resources)
@@ -61,14 +72,14 @@ async def load_all(self, resources: list[str]) -> base.LoaderResults:
         # TemporaryDirectory gets discarded), but that seems reasonable.
         print("Copying ndjson input files…")
         tmpdir = tempfile.TemporaryDirectory()
-        filenames = common.ls_resources(input_root, set(resources), warn_if_empty=True)
+        filenames = common.ls_resources(input_root, resources, warn_if_empty=True)
         for filename in filenames:
             input_root.get(filename, f"{tmpdir.name}/")
 
         return self.read_loader_results(input_root, tmpdir)
 
     async def load_from_bulk_export(
-        self, resources: list[str], prefer_url_resources: bool = False
+        self, resources: set[str], prefer_url_resources: bool = False
     ) -> common.Directory:
         """
         Performs a bulk export and drops the results in an export dir.

cumulus_etl/loaders/i2b2/loader.py

@@ -34,7 +34,27 @@ def __init__(self, root: store.Root, export_to: str | None = None):
         super().__init__(root)
         self.export_to = export_to
 
-    async def load_all(self, resources: list[str]) -> base.LoaderResults:
+    async def detect_resources(self) -> set[str] | None:
+        if self.root.protocol in {"tcp"}:
+            return None  # we haven't done the export yet!
+
+        filenames = {
+            "observation_fact_diagnosis.csv": "Condition",
+            "observation_fact_lab_views.csv": "Observation",
+            "observation_fact_medications.csv": "MedicationRequest",
+            "observation_fact_notes.csv": "DocumentReference",
+            "observation_fact_vitals.csv": "Observation",
+            "patient_dimension.csv": "Patient",
+            "visit_dimension.csv": "Encounter",
+        }
+
+        return {
+            resource
+            for path, resource in filenames.items()
+            if self.root.exists(self.root.joinpath(path))
+        }
+
+    async def load_resources(self, resources: set[str]) -> base.LoaderResults:
         if self.root.protocol in ["tcp"]:
             directory = self._load_all_from_oracle(resources)
         else:
@@ -43,7 +63,7 @@ async def load_all(self, resources: list[str]) -> base.LoaderResults:
 
     def _load_all_with_extractors(
         self,
-        resources: list[str],
+        resources: set[str],
         conditions: I2b2ExtractorCallable,
         lab_views: I2b2ExtractorCallable,
         medicationrequests: I2b2ExtractorCallable,
@@ -139,7 +159,7 @@ def _loop(
     #
     ###################################################################################################################
 
-    def _load_all_from_csv(self, resources: list[str]) -> common.Directory:
+    def _load_all_from_csv(self, resources: set[str]) -> common.Directory:
         path = self.root.path
         return self._load_all_with_extractors(
             resources,
@@ -177,7 +197,7 @@ def _load_all_from_csv(self, resources: list[str]) -> common.Directory:
     #
     ###################################################################################################################
 
-    def _load_all_from_oracle(self, resources: list[str]) -> common.Directory:
+    def _load_all_from_oracle(self, resources: set[str]) -> common.Directory:
         path = self.root.path
         return self._load_all_with_extractors(
             resources,

cumulus_etl/upload_notes/downloader.py

@@ -27,7 +27,7 @@ async def download_docrefs_from_fhir_server(
     else:
         # else we'll download the entire target path as a bulk export (presumably the user has scoped a Group)
         ndjson_loader = loaders.FhirNdjsonLoader(root_input, client, export_to=export_to)
-        return await ndjson_loader.load_all(["DocumentReference"])
+        return await ndjson_loader.load_resources({"DocumentReference"})
 
 
 async def _download_docrefs_from_fake_ids(