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feat: meilisearch backend for notes search
This is a very simple and basic backend. It is based on Django signals, just like the Elasticsearch backend. But it is much simpler, in the sense that there are just two signals: one for saving documents and one for deletion. This backend is limited, in the sense that it does not support highlighting -- but that's probably not such a big deal. To start using this backend, define the following settings: ES_DISABLED = True MEILISEARCH_ENABLED = True MEILISEARCH_URL = "http://meilisearch:7700" MEILISEARCH_API_KEY = "s3cr3t" MEILISEARCH_INDEX = "tutor_student_notes"
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| """ | ||
| Meilisearch views to search for annotations. | ||
| To enable this backend, define the following settings: | ||
| ES_DISABLED = True | ||
| MEILISEARCH_ENABLED = True | ||
| Then check the Client class for more information about Meilisearch credential settings. | ||
| """ | ||
|
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| import traceback | ||
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| import meilisearch | ||
| from django.conf import settings | ||
| from django.db.models import signals | ||
| from django.dispatch import receiver | ||
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| from notesapi.v1.models import Note | ||
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| from .common import AnnotationSearchView as BaseAnnotationSearchView | ||
| from .exceptions import SearchViewRuntimeError | ||
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| class Client: | ||
| """ | ||
| Simple Meilisearch client class | ||
| It depends on the following Django settings: | ||
| - MEILISEARCH_URL | ||
| - MEILISEARCH_API_KEY | ||
| - MEILISEARCH_INDEX | ||
| """ | ||
|
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| _CLIENT = None | ||
| _INDEX = None | ||
| FILTERABLES = ["user_id", "course_id"] | ||
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| @property | ||
| def meilisearch_client(self) -> meilisearch.Client: | ||
| """ | ||
| Return a meilisearch client. | ||
| """ | ||
| if self._CLIENT is None: | ||
| self._CLIENT = meilisearch.Client( | ||
| getattr(settings, "MEILISEARCH_URL", "http://meilisearch:7700"), | ||
| getattr(settings, "MEILISEARCH_API_KEY", ""), | ||
| ) | ||
| return self._CLIENT | ||
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| @property | ||
| def meilisearch_index(self) -> meilisearch.index.Index: | ||
| """ | ||
| Return the meilisearch index used to store annotations. | ||
| If the index does not exist, it is created. And if it does not have the right | ||
| filterable fields, then it is updated. | ||
| """ | ||
| if self._INDEX is None: | ||
| index_name = getattr(settings, "MEILISEARCH_INDEX", "student_notes") | ||
| try: | ||
| self._INDEX = self.meilisearch_client.get_index(index_name) | ||
| except meilisearch.errors.MeilisearchApiError: | ||
| task = self.meilisearch_client.create_index( | ||
| index_name, {"primaryKey": "id"} | ||
| ) | ||
| self.meilisearch_client.wait_for_task(task.task_uid, timeout_in_ms=2000) | ||
| self._INDEX = self.meilisearch_client.get_index(index_name) | ||
|
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| # Checking filterable attributes | ||
| existing_filterables = set(self._INDEX.get_filterable_attributes()) | ||
| if not set(self.FILTERABLES).issubset(existing_filterables): | ||
| all_filterables = list(existing_filterables.union(self.FILTERABLES)) | ||
| self._INDEX.update_filterable_attributes(all_filterables) | ||
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| return self._INDEX | ||
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| class AnnotationSearchView(BaseAnnotationSearchView): | ||
| def get_queryset(self): | ||
| """ | ||
| Simple result filtering method based on test search. | ||
| We simply include in the query only those that match the text search query. Note | ||
| that this backend does not support highlighting (yet). | ||
| """ | ||
| if not self.is_text_search: | ||
| return super().get_queryset() | ||
|
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| queryset = Note.objects.filter(**self.query_params).order_by("-updated") | ||
|
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| # Define meilisearch params | ||
| filters = [ | ||
| f"user_id = '{self.params['user']}'", | ||
| f"course_id = '{self.params['course_id']}'", | ||
| ] | ||
| page_size = int(self.params["page_size"]) | ||
| offset = (int(self.params["page"]) - 1) * page_size | ||
|
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| # Perform search | ||
| search_results = Client().meilisearch_index.search( | ||
| self.params["text"], | ||
| {"offset": offset, "limit": page_size, "filter": filters}, | ||
| ) | ||
|
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| # Limit to these ID | ||
| queryset.filter(id__in=[r["id"] for r in search_results["hits"]]) | ||
| return queryset | ||
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| @receiver(signals.post_save, sender=Note) | ||
| def on_note_save(sender, instance, **kwargs): # pylint: disable=unused-argument | ||
| """ | ||
| Create or update a document. | ||
| """ | ||
| document = { | ||
| "id": instance.id, | ||
| "user_id": instance.user_id, | ||
| "course_id": instance.course_id, | ||
| "text": instance.text, | ||
| } | ||
| Client().meilisearch_index.add_documents([document]) | ||
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| @receiver(signals.post_delete, sender=Note) | ||
| def on_note_delete(sender, instance, **kwargs): # pylint: disable=unused-argument | ||
| """ | ||
| Delete a document. | ||
| """ | ||
| Client().meilisearch_index.delete_document(instance.id) | ||
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| def heartbeat(): | ||
| """ | ||
| Check that the meilisearch client is healthy. | ||
| """ | ||
| if not Client().meilisearch_client.is_healthy(): | ||
| raise SearchViewRuntimeError("meilisearch") | ||
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| def selftest(): | ||
| """ | ||
| Check that we can access the meilisearch index. | ||
| """ | ||
| try: | ||
| return {"meilisearch": Client().meilisearch_index.created_at} | ||
| except meilisearch.errors.MeilisearchError as e: | ||
| raise SearchViewRuntimeError( | ||
| {"meilisearch_error": traceback.format_exc()} | ||
| ) from e |
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