typeahead

endpoints/lyric_search.py

@@ -4,9 +4,11 @@
 import importlib
 import traceback
 import logging
+import os
 import urllib.parse
 import regex
 import aiohttp
+import aiosqlite as sqlite3
 from fastapi import FastAPI, HTTPException
 from pydantic import BaseModel 
 from lyric_search_new.sources import aggregate 
@@ -43,6 +45,13 @@ class ValidLyricRequest(BaseModel):
                         "lrc": False,
                     }
             }
+        
+class ValidTypeAheadRequest(BaseModel):
+    """
+    - **query**: query string
+    """
+    pre_query: str|None = None
+    query: str
 
         
 class ValidLyricSearchLogRequest(BaseModel):
@@ -52,6 +61,28 @@ class ValidLyricSearchLogRequest(BaseModel):
 
     webradio: bool = False
 
+
+class CacheUtils:
+    """Lyrics Cache DB Utils"""
+    def __init__(self):
+        self.lyrics_db_path = os.path.join("/", "var", "lib",
+                                        "singerdbs", "cached_lyrics.db")    
+        
+    async def check_typeahead(self, s: str, pre_query: str | None = None):
+        """Check s against artists stored - for typeahead"""
+        async with sqlite3.connect(self.lyrics_db_path,
+                                   timeout=2) as db_conn:
+            db_conn.row_factory = lambda c, r: dict([(col[0], r[idx]) for idx, col in enumerate(c.description)])
+            if not pre_query:
+                query = "SELECT distinct(artist) FROM lyrics WHERE artist LIKE ? LIMIT 15"
+                query_params = (f"%{s}%",)
+            else:
+                query = "SELECT distinct(song) FROM lyrics WHERE artist LIKE ? AND song LIKE ? LIMIT 15"
+                query_params = (f"%{pre_query}%", f"%{s}%",)
+            async with db_conn.execute(query, query_params) as db_cursor:
+                return await db_cursor.fetchall()
+
+
 class LyricSearch(FastAPI):
     """Lyric Search Endpoint"""
     def __init__(self, app: FastAPI, util, constants, glob_state): # pylint: disable=super-init-not-called
@@ -59,12 +90,15 @@ class LyricSearch(FastAPI):
         self.util = util
         self.constants = constants
         self.glob_state = glob_state
+        self.cache_utils = CacheUtils()
         self.lyrics_engine = importlib.import_module("lyrics_engine").LyricsEngine()
 
         self.endpoint_name = "lyric_search"
         self.endpoint2_name = "lyric_cache_list"
 
         self.endpoints = {
+            "typeahead/artist": self.artist_typeahead_handler,
+            "typeahead/song": self.song_typeahead_handler,
             "lyric_search": self.lyric_search_handler,
             "lyric_cache_list": self.lyric_cache_list_handler,
             "lyric_search_history": self.lyric_search_log_handler,
@@ -96,6 +130,32 @@ class LyricSearch(FastAPI):
             'data': await self.lyrics_engine.listCacheEntries()
         }
     
+    async def artist_typeahead_handler(self, data: ValidTypeAheadRequest):
+        """Artist Type  Ahead Handler"""
+        if not isinstance(data.query, str) or len(data.query) < 2:
+            return {
+                'err': True,
+                'errorText': 'Invalid request',
+            }
+        query = data.query
+        typeahead_result = await self.cache_utils.check_typeahead(query)
+        typeahead_list = [str(r.get('artist')) for r in typeahead_result]
+        return typeahead_list
+    
+    async def song_typeahead_handler(self, data: ValidTypeAheadRequest):
+        """Song Type Ahead Handler"""
+        if not isinstance(data.pre_query, str) or len(data.pre_query) < 2\
+            or not isinstance(data.query, str) or len(data.query) < 2:
+            return {
+                'err': True,
+                'errorText': 'Invalid request',
+            }
+        pre_query = data.pre_query
+        query = data.query
+        typeahead_result = await self.cache_utils.check_typeahead(query, pre_query)
+        typeahead_list = [str(r.get('song')) for r in typeahead_result]
+        return typeahead_list
+    
     async def lyric_search_log_handler(self, data: ValidLyricSearchLogRequest):
         """Lyric Search Log Handler"""
         include_radio = data.webradio