Revised CalCat API

This is based on our discussion last week, but it's still a WIP. In particular, I haven't implemented actually loading the constants yet.

I've tweaked the design slightly: rather than having CalibrationData subclasses for each detector type, you use CalibrationData.from_conditions() with a detector specific object like AGIPDConditions. Jump to the tests to see what this looks like.

Questions:

• How to deal with missing modules?
  • A module may be missing for one type of constant but not for another
  • How do we even tell if modules are missing - should we query the PDUs so we know how many modules to expect?
• How to deal with missing calibration types (e.g. SlopesPC)
  • Especially if one group (e.g. illuminated) not found - this currently raises an error, even if we have other constants we could return
• Naming:
  • 'Calibrations' vs 'calibration' types vs 'constant types' (e.g. Offset, SlopesPC
  • 'Modules' vs 'aggregators'
• How many of SingleConstantVersion fields do we actually want?
• Should .select_modules() and .select_calibrations() take *args or a list?

cc @schmidtp @ahmedk @hammerd

src/cal_tools/calcat_interface2.py

+import json
+import re
 from collections.abc import Mapping
 from dataclasses import dataclass
-from datetime import datetime
+from datetime import date, datetime, time, timezone
+from functools import lru_cache
 from pathlib import Path
-from typing import Dict, Optional, Sequence, Union
+from typing import Dict, List, Optional, Union
+from urllib.parse import urljoin
 
 import h5py
 import numpy as np
 import pasha as psh
-from calibration_client import CalibrationClient
-from calibration_client.modules import CalibrationConstantVersion
-
-from .calcat_interface import CalCatApi, CalCatError
-from .tools import module_index_to_qm
+import requests
+from oauth2_xfel_client import Oauth2ClientBackend
 
 
 class ModuleNameError(KeyError):
@@ -22,6 +23,95 @@ class ModuleNameError(KeyError):
         return f"No module named {self.name!r}"
 
 
+class APIError(requests.HTTPError):
+    """Used when the response includes error details as JSON"""
+
+
+class CalCatAPIClient:
+    def __init__(self, base_api_url, oauth_client=None, user_email=""):
+        if oauth_client is not None:
+            self.oauth_client = oauth_client
+            self.session = self.oauth_client.session
+        else:
+            # Oauth disabled - used with base_api_url pointing to an
+            # xfel-oauth-proxy instance
+            self.oauth_client = None
+            self.session = requests.Session()
+
+        self.user_email = user_email
+        # Ensure the base URL has a trailing slash
+        self.base_api_url = base_api_url.rstrip("/") + "/"
+
+    def default_headers(self):
+        return {
+            "content-type": "application/json",
+            "Accept": "application/json; version=2",
+            "X-User-Email": self.user_email,
+        }
+
+    @classmethod
+    def format_time(cls, dt):
+        """Parse different ways to specify time to CalCat."""
+
+        if isinstance(dt, datetime):
+            return dt.astimezone(timezone.utc).isoformat()
+        elif isinstance(dt, date):
+            return cls.format_time(datetime.combine(dt, time()))
+
+        return dt
+
+    def get_request(self, relative_url, params=None, headers=None, **kwargs):
+        """Make a GET request, return the HTTP response object"""
+        # Base URL may include e.g. '/api/'. This is a prefix for all URLs;
+        # even if they look like an absolute path.
+        url = urljoin(self.base_api_url, relative_url.lstrip("/"))
+        _headers = self.default_headers()
+        if headers:
+            _headers.update(headers)
+        return self.session.get(url, params=params, headers=_headers, **kwargs)
+
+    @staticmethod
+    def _parse_response(resp: requests.Response):
+        if resp.status_code >= 400:
+            try:
+                d = json.loads(resp.content.decode("utf-8"))
+            except Exception:
+                resp.raise_for_status()
+            else:
+                raise APIError(
+                    f"Error {resp.status_code} from API: "
+                    f"{d.get('info', 'missing details')}"
+                )
+
+        if resp.content == b"":
+            return None
+        else:
+            return json.loads(resp.content.decode("utf-8"))
+
+    def get(self, relative_url, params=None, **kwargs):
+        """Make a GET request, return response content from JSON"""
+        resp = self.get_request(relative_url, params, **kwargs)
+        return self._parse_response(resp)
+
+    _pagination_headers = (
+        "X-Total-Pages",
+        "X-Count-Per-Page",
+        "X-Current-Page",
+        "X-Total-Count",
+    )
+
+    def get_paged(self, relative_url, params=None, **kwargs):
+        """Make a GET request, return response content & pagination info"""
+        resp = self.get_request(relative_url, params, **kwargs)
+        content = self._parse_response(resp)
+        pagination_info = {
+            k[2:].lower().replace("-", "_"): int(resp.headers[k])
+            for k in self._pagination_headers
+            if k in resp.headers
+        }
+        return content, pagination_info
+
+
 global_client = None
 
 
@@ -32,19 +122,35 @@ def get_client():
     return global_client
 
 
-def setup_client(base_url, client_id, client_secret, user_email, **kwargs):
+def setup_client(
+    base_url,
+    client_id,
+    client_secret,
+    user_email,
+    scope="",
+    session_token=None,
+    oauth_retries=3,
+    oauth_timeout=12,
+    ssl_verify=True,
+):
     global global_client
-    global_client = CalibrationClient(
-        use_oauth2=(client_id is not None),
-        client_id=client_id,
-        client_secret=client_secret,
+    if client_id is not None:
+        oauth_client = Oauth2ClientBackend(
+            client_id=client_id,
+            client_secret=client_secret,
+            scope=scope,
+            token_url=f"{base_url}/oauth/token",
+            session_token=session_token,
+            max_retries=oauth_retries,
+            timeout=oauth_timeout,
+            ssl_verify=ssl_verify,
+        )
+    else:
+        oauth_client = None
+    global_client = CalCatAPIClient(
+        f"{base_url}/api/",
+        oauth_client=oauth_client,
         user_email=user_email,
-        base_api_url=f"{base_url}/api/",
-        token_url=f"{base_url}/oauth/token",
-        refresh_url=f"{base_url}/oauth/token",
-        auth_url=f"{base_url}/oauth/authorize",
-        scope="",
-        **kwargs,
     )
 
 
@@ -117,22 +223,56 @@ class ModulesConstantVersions:
     """A group of similar CCVs for several modules of one detector"""
 
     constants: Dict[str, SingleConstantVersion]  # Keys e.g. 'LPD00'
+    module_details: List[Dict]
+
+    def select_modules(
+        self, module_nums=None, *, aggregators=None, qm_names=None
+    ) -> "ModulesConstantVersions":
+        n_specified = sum(
+            [module_nums is not None, aggregators is not None, qm_names is not None]
+        )
+        if n_specified < 1:
+            raise TypeError("select_modules() requires an argument")
+        elif n_specified > 1:
+            raise TypeError(
+                "select_modules() accepts only one of module_nums, aggregators & qm_names"
+            )
+
+        if module_nums is not None:
+            by_mod_no = {m["module_number"]: m for m in self.module_details}
+            aggregators = [by_mod_no[n]["karabo_da"] for n in module_nums]
+        elif qm_names is not None:
+            by_qm = {m["virtual_device_name"]: m for m in self.module_details}
+            aggregators = [by_qm[s]["karabo_da"] for s in qm_names]
+        elif aggregators is not None:
+            miss = set(aggregators) - {m["karabo_da"] for m in self.module_details}
+            if miss:
+                raise KeyError("Aggregators not found: " + ", ".join(sorted(miss)))
 
-    def select_modules(self, aggregators) -> "ModulesConstantVersions":
         d = {aggr: scv for (aggr, scv) in self.constants.items() if aggr in aggregators}
-        return ModulesConstantVersions(d)
+        return ModulesConstantVersions(d, self.module_details)
 
+    # These properties label only the modules we have constants for, which may
+    # be a subset of what's in module_details
     @property
     def aggregators(self):
         return sorted(self.constants)
 
     @property
     def module_nums(self):
-        return [int(da[-2:]) for da in self.aggregators]
+        return [
+            m["module_number"]
+            for m in self.module_details
+            if m["karabo_da"] in self.constants
+        ]
 
     @property
     def qm_names(self):
-        return [module_index_to_qm(n) for n in self.module_nums]
+        return [
+            m["virtual_device_name"]
+            for m in self.module_details
+            if m["karabo_da"] in self.constants
+        ]
 
     def ndarray(self, caldb_root=None):
         eg_dset = self.constants[self.aggregators[0]].dataset_obj(caldb_root)
@@ -165,22 +305,69 @@ class ModulesConstantVersions:
         return xarray.DataArray(ndarr, dims=dims, coords=coords, name=name)
 
 
+@lru_cache()
+def detector(identifier, client=None):
+    client = client or get_client()
+    res = client.get("detectors", {"identifier": identifier})
+    if not res:
+        raise KeyError(f"No detector with identifier {identifier}")
+    elif len(res) > 1:
+        raise ValueError(f"Multiple detectors found with identifier {identifier}")
+    return res[0]
+
+
+@lru_cache()
+def calibration_id(name, client=None):
+    """ID for a calibration in CalCat."""
+    client = client or get_client()
+    res = client.get("calibrations", {"name": name})
+    if not res:
+        raise KeyError(f"No calibration with name {name}")
+    elif len(res) > 1:
+        raise ValueError(f"Multiple calibrations found with name {name}")
+    return res[0]["id"]
+
+
+@lru_cache()
+def calibration_name(cal_id, client=None):
+    """Name for a calibration in CalCat."""
+    client = client or get_client()
+    res = client.get(f"calibrations/{cal_id}")
+    return res["name"]
+
+
 class CalibrationData(Mapping):
     """Collected constants for a given detector"""
 
-    def __init__(self, constant_groups, aggregators):
+    def __init__(self, constant_groups, module_details):
         self.constant_groups = {
-            const_type: ModulesConstantVersions(d)
+            const_type: ModulesConstantVersions(d, module_details)
             for const_type, d in constant_groups.items()
         }
-        self.aggregators = aggregators
+        self.module_details = module_details
+
+    @staticmethod
+    def _format_cond(condition):
+        """Encode operating condition to CalCat API format.
+
+        Args:
+            condition (dict): Mapping of parameter DB name to value
+
+        Returns:
+            (dict) Operating condition for use in CalCat API.
+        """
+
+        return {
+            "parameters_conditions_attributes": [
+                {"parameter_name": k, "value": str(v)} for k, v in condition.items()
+            ]
+        }
 
     @classmethod
     def from_condition(
         cls,
         condition: "ConditionsBase",
         detector_name,
-        modules: Optional[Sequence[str]] = None,
         calibrations=None,
         client=None,
         event_at=None,
@@ -196,17 +383,20 @@ class CalibrationData(Mapping):
             if cal_type in calibrations:
                 cal_types_by_params_used.setdefault(tuple(params), []).append(cal_type)
 
-        api = CalCatApi(client or get_client())
+        client = client or get_client()
 
-        detector_id = api.detector(detector_name)["id"]
-        all_modules = api.physical_detector_units(detector_id, pdu_snapshot_at)
-        if modules is None:
-            modules = sorted(all_modules)
-        else:
-            modules = sorted(modules)
-            for m in modules:
-                if m not in all_modules:
-                    raise ModuleNameError(m)
+        detector_id = detector(detector_name)["id"]
+        pdus = client.get(
+            "physical_detector_units/get_all_by_detector",
+            {
+                "detector_id": detector_id,
+                "pdu_snapshot_at": client.format_time(pdu_snapshot_at),
+            },
+        )
+        module_details = sorted(pdus, key=lambda d: d["karabo_da"])
+        for mod in module_details:
+            if mod.get("module_number", -1) < 0:
+                mod["module_number"] = int(re.findall(r"\d+", mod["karabo_da"])[-1])
 
         d = {}
 
@@ -214,18 +404,20 @@ class CalibrationData(Mapping):
             condition_dict = condition.make_dict(params)
 
             cal_id_map = {
-                api.calibration_id(calibration): calibration
-                for calibration in cal_types
+                calibration_id(calibration): calibration for calibration in cal_types
             }
             calibration_ids = list(cal_id_map.keys())
 
-            query_res = api._closest_ccv_by_time_by_condition(
-                detector_name,
-                calibration_ids,
-                condition_dict,
-                modules[0] if len(modules) == 1 else "",
-                event_at,
-                pdu_snapshot_at or event_at,
+            query_res = client.get(
+                "calibration_constant_versions/get_by_detector_conditions",
+                {
+                    "detector_identifier": detector_name,
+                    "calibration_id": str(calibration_ids),
+                    "karabo_da": "",
+                    "event_at": client.format_time(event_at),
+                    "pdu_snapshot_at": client.format_time(pdu_snapshot_at),
+                },
+                data=json.dumps(cls._format_cond(condition_dict)),
             )
 
             for ccv in query_res:
@@ -236,10 +428,7 @@ class CalibrationData(Mapping):
                     ccv
                 )
 
-        res = cls(d, modules)
-        if modules:
-            res = res.select_modules(modules)
-        return res
+        return cls(d, module_details)
 
     @classmethod
     def from_report(
@@ -248,32 +437,26 @@ class CalibrationData(Mapping):
         client=None,
     ):
         client = client or get_client()
-        api = CalCatApi(client)
 
+        # Use max page size, hopefully always enough for CCVs from 1 report
+        params = {"page_size": 500}
         if isinstance(report_id_or_path, int):
-            resp = CalibrationConstantVersion.get_by_report_id(
-                client, report_id_or_path
-            )
+            params["report_id"] = report_id_or_path  # Numeric ID
         else:
-            resp = CalibrationConstantVersion.get_by_report_path(
-                client, report_id_or_path
-            )
+            params["report.file_path"] = str(report_id_or_path)
 
-        if not resp["success"]:
-            raise CalCatError(resp)
+        res = client.get("calibration_constant_versions", params)
 
         d = {}
-        aggregators = set()
+        pdus = []
 
-        for ccv in resp["data"]:
+        for ccv in res:
+            pdus.append(ccv["physical_detector_unit"])
+            cal_type = calibration_name(ccv["calibration_constant"]["calibration_id"])
             aggr = ccv["physical_detector_unit"]["karabo_da"]
-            aggregators.add(aggr)
-            cal_type = api.calibration_name(
-                ccv["calibration_constant"]["calibration_id"]
-            )
             d.setdefault(cal_type, {})[aggr] = SingleConstantVersion.from_response(ccv)
 
-        return cls(d, sorted(aggregators))
+        return cls(d, sorted(pdus, key=lambda d: d["karabo_da"]))
 
     def __getitem__(self, key) -> ModulesConstantVersions:
         return self.constant_groups[key]
@@ -284,13 +467,30 @@ class CalibrationData(Mapping):
     def __len__(self):
         return len(self.constant_groups)
 
+    def __repr__(self):
+        return (
+            f"<CalibrationData: {', '.join(sorted(self.constant_groups))} "
+            f"constants for {len(self.module_details)} modules>"
+        )
+
+    # These properties may include modules for which we have no constants -
+    # when created with .from_condition(), they represent all modules present in
+    # the detector (at the specified time).
     @property
     def module_nums(self):
-        return [int(da[-2:]) for da in self.aggregators]
+        return [m["module_number"] for m in self.module_details]
+
+    @property
+    def aggregator_names(self):
+        return [m["karabo_da"] for m in self.module_details]
 
     @property
     def qm_names(self):
-        return [module_index_to_qm(n) for n in self.module_nums]
+        return [m["virtual_device_name"] for m in self.module_details]
+
+    @property
+    def pdu_names(self):
+        return [m["physical_name"] for m in self.module_details]
 
     def require_calibrations(self, calibrations):
         """Drop any modules missing the specified constant types"""
@@ -313,10 +513,16 @@ class CalibrationData(Mapping):
         # TODO: missing for some modules?
         return type(self)(d, self.aggregators)
 
-    def select_modules(self, aggregators):
+    def select_modules(
+        self, module_nums=None, *, aggregators=None, qm_names=None
+    ) -> "CalibrationData":
         return type(self)(
             {
-                cal_type: mcv.select_modules(aggregators).constants
+                cal_type: mcv.select_modules(
+                    module_nums=module_nums,
+                    aggregators=aggregators,
+                    qm_names=qm_names,
+                ).constants
                 for (cal_type, mcv) in self.constant_groups.items()
             },
             sorted(aggregators),