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"""HTTP/REST client backend that makes calls to a web service |
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and returns the results""" |
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import importlib |
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import dateutil.parser |
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import requests |
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import requests.exceptions |
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from annif.exception import OperationFailedException |
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from annif.suggestion import ListSuggestionResult, SubjectSuggestion |
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from . import backend |
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class HTTPBackend(backend.AnnifBackend): |
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name = "http" |
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_headers = None |
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@property |
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def headers(self): |
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if self._headers is None: |
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version = importlib.metadata.version("annif") |
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self._headers = { |
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"User-Agent": f"Annif/{version}", |
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} |
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return self._headers |
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@property |
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def is_trained(self): |
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return self._get_project_info("is_trained") |
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@property |
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def modification_time(self): |
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mtime = self._get_project_info("modification_time") |
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if mtime is None: |
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return None |
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return dateutil.parser.parse(mtime) |
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def _get_project_info(self, key): |
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params = self._get_backend_params(None) |
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try: |
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req = requests.get( |
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params["endpoint"].replace("/suggest", ""), headers=self.headers |
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) |
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req.raise_for_status() |
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except requests.exceptions.RequestException as err: |
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msg = f"HTTP request failed: {err}" |
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raise OperationFailedException(msg) from err |
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try: |
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response = req.json() |
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except ValueError as err: |
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msg = f"JSON decode failed: {err}" |
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raise OperationFailedException(msg) from err |
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if key in response: |
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return response[key] |
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else: |
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return None |
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def _suggest(self, text, params): |
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data = {"text": text} |
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if "project" in params: |
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data["project"] = params["project"] |
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try: |
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req = requests.post(params["endpoint"], data=data, headers=self.headers) |
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req.raise_for_status() |
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except requests.exceptions.RequestException as err: |
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self.warning("HTTP request failed: {}".format(err)) |
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return ListSuggestionResult([]) |
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try: |
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response = req.json() |
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except ValueError as err: |
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self.warning("JSON decode failed: {}".format(err)) |
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return ListSuggestionResult([]) |
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if "results" in response: |
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results = response["results"] |
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else: |
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results = response |
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try: |
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subject_suggestions = [ |
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SubjectSuggestion( |
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subject_id=self.project.subjects.by_uri(hit["uri"]), |
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score=hit["score"], |
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) |
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for hit in results |
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if hit["score"] > 0.0 |
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] |
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except (TypeError, ValueError) as err: |
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self.warning("Problem interpreting JSON data: {}".format(err)) |
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return ListSuggestionResult([]) |
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return ListSuggestionResult(subject_suggestions) |
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NatLibFi /
Annif
