547 lines
18 KiB
Python
547 lines
18 KiB
Python
"""
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Functionality:
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- initial elastic search setup
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- index configuration is represented in INDEX_CONFIG
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- index mapping and settings validation
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- backup and restore
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"""
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import json
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import os
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import zipfile
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from datetime import datetime
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import requests
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from home.src.config import AppConfig
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from home.src.helper import ignore_filelist
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# expected mapping and settings
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INDEX_CONFIG = [
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{
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"index_name": "channel",
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"expected_map": {
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"channel_id": {
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"type": "keyword",
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},
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"channel_name": {
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"type": "text",
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"fields": {
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"keyword": {
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"type": "keyword",
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"ignore_above": 256,
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"normalizer": "to_lower",
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},
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"search_as_you_type": {
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"type": "search_as_you_type",
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"doc_values": False,
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"max_shingle_size": 3,
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},
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},
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},
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"channel_banner_url": {"type": "keyword", "index": False},
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"channel_thumb_url": {"type": "keyword", "index": False},
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"channel_description": {"type": "text"},
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"channel_last_refresh": {"type": "date", "format": "epoch_second"},
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},
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"expected_set": {
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"analysis": {
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"normalizer": {
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"to_lower": {"type": "custom", "filter": ["lowercase"]}
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}
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},
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"number_of_replicas": "0",
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},
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},
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{
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"index_name": "video",
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"expected_map": {
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"vid_thumb_url": {"type": "text", "index": False},
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"date_downloaded": {"type": "date"},
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"channel": {
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"properties": {
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"channel_id": {
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"type": "keyword",
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},
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"channel_name": {
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"type": "text",
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"fields": {
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"keyword": {
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"type": "keyword",
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"ignore_above": 256,
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"normalizer": "to_lower",
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},
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"search_as_you_type": {
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"type": "search_as_you_type",
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"doc_values": False,
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"max_shingle_size": 3,
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},
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},
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},
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"channel_banner_url": {"type": "keyword", "index": False},
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"channel_thumb_url": {"type": "keyword", "index": False},
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"channel_description": {"type": "text"},
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"channel_last_refresh": {
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"type": "date",
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"format": "epoch_second",
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},
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}
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},
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"description": {"type": "text"},
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"media_url": {"type": "keyword", "index": False},
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"title": {
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"type": "text",
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"fields": {
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"keyword": {
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"type": "keyword",
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"ignore_above": 256,
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"normalizer": "to_lower",
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},
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"search_as_you_type": {
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"type": "search_as_you_type",
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"doc_values": False,
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"max_shingle_size": 3,
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},
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},
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},
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"vid_last_refresh": {"type": "date"},
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"youtube_id": {"type": "keyword"},
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"published": {"type": "date"},
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},
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"expected_set": {
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"analysis": {
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"normalizer": {
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"to_lower": {"type": "custom", "filter": ["lowercase"]}
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}
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},
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"number_of_replicas": "0",
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},
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},
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{
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"index_name": "download",
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"expected_map": {
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"timestamp": {"type": "date"},
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"channel_id": {"type": "keyword"},
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"channel_name": {
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"type": "text",
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"fields": {
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"keyword": {
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"type": "keyword",
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"ignore_above": 256,
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"normalizer": "to_lower",
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}
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},
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},
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"status": {"type": "keyword"},
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"title": {
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"type": "text",
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"fields": {
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"keyword": {
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"type": "keyword",
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"ignore_above": 256,
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"normalizer": "to_lower",
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}
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},
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},
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"vid_thumb_url": {"type": "keyword"},
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"youtube_id": {"type": "keyword"},
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},
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"expected_set": {
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"analysis": {
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"normalizer": {
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"to_lower": {"type": "custom", "filter": ["lowercase"]}
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}
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},
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"number_of_replicas": "0",
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},
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},
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]
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class ElasticIndex:
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"""
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handle mapping and settings on elastic search for a given index
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"""
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CONFIG = AppConfig().config
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ES_URL = CONFIG["application"]["es_url"]
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ES_AUTH = CONFIG["application"]["es_auth"]
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HEADERS = {"Content-type": "application/json"}
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def __init__(self, index_name, expected_map, expected_set):
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self.index_name = index_name
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self.expected_map = expected_map
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self.expected_set = expected_set
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self.exists, self.details = self.index_exists()
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def index_exists(self):
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"""check if index already exists and return mapping if it does"""
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index_name = self.index_name
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url = f"{self.ES_URL}/ta_{index_name}"
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response = requests.get(url, auth=self.ES_AUTH)
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exists = response.ok
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if exists:
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details = response.json()[f"ta_{index_name}"]
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else:
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details = False
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return exists, details
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def validate(self):
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"""
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check if all expected mappings and settings match
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returns True when rebuild is needed
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"""
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if self.expected_map:
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rebuild = self.validate_mappings()
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if rebuild:
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return rebuild
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if self.expected_set:
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rebuild = self.validate_settings()
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if rebuild:
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return rebuild
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return False
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def validate_mappings(self):
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"""check if all mappings are as expected"""
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expected_map = self.expected_map
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now_map = self.details["mappings"]["properties"]
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for key, value in expected_map.items():
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# nested
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if list(value.keys()) == ["properties"]:
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for key_n, value_n in value["properties"].items():
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if key_n not in now_map[key]["properties"].keys():
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print(key_n, value_n)
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return True
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if not value_n == now_map[key]["properties"][key_n]:
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print(key_n, value_n)
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return True
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continue
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# not nested
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if key not in now_map.keys():
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print(key, value)
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return True
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if not value == now_map[key]:
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print(key, value)
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return True
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return False
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def validate_settings(self):
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"""check if all settings are as expected"""
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now_set = self.details["settings"]["index"]
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for key, value in self.expected_set.items():
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if key not in now_set.keys():
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print(key, value)
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return True
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if not value == now_set[key]:
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print(key, value)
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return True
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return False
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def rebuild_index(self):
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"""rebuild with new mapping"""
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# backup
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self.reindex("backup")
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# delete original
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self.delete_index(backup=False)
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# create new
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self.create_blank()
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self.reindex("restore")
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# delete backup
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self.delete_index()
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def reindex(self, method):
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"""create on elastic search"""
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index_name = self.index_name
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if method == "backup":
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source = f"ta_{index_name}"
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destination = f"ta_{index_name}_backup"
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elif method == "restore":
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source = f"ta_{index_name}_backup"
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destination = f"ta_{index_name}"
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query = {"source": {"index": source}, "dest": {"index": destination}}
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data = json.dumps(query)
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url = self.ES_URL + "/_reindex?refresh=true"
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response = requests.post(
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url=url, data=data, headers=self.HEADERS, auth=self.ES_AUTH
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)
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if not response.ok:
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print(response.text)
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def delete_index(self, backup=True):
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"""delete index passed as argument"""
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if backup:
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url = f"{self.ES_URL}/ta_{self.index_name}_backup"
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else:
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url = f"{self.ES_URL}/ta_{self.index_name}"
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response = requests.delete(url, auth=self.ES_AUTH)
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if not response.ok:
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print(response.text)
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def create_blank(self):
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"""apply new mapping and settings for blank new index"""
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expected_map = self.expected_map
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expected_set = self.expected_set
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# stich payload
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payload = {}
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if expected_set:
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payload.update({"settings": expected_set})
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if expected_map:
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payload.update({"mappings": {"properties": expected_map}})
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# create
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url = f"{self.ES_URL}/ta_{self.index_name}"
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data = json.dumps(payload)
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response = requests.put(
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url=url, data=data, headers=self.HEADERS, auth=self.ES_AUTH
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)
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if not response.ok:
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print(response.text)
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class ElasticBackup:
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"""dump index to nd-json files for later bulk import"""
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def __init__(self, index_config):
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self.config = AppConfig().config
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self.index_config = index_config
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self.timestamp = datetime.now().strftime("%Y%m%d")
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self.backup_files = []
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def get_all_documents(self, index_name):
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"""export all documents of a single index"""
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headers = {"Content-type": "application/json"}
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es_url = self.config["application"]["es_url"]
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es_auth = self.config["application"]["es_auth"]
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# get PIT ID
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url = f"{es_url}/ta_{index_name}/_pit?keep_alive=1m"
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response = requests.post(url, auth=es_auth)
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json_data = json.loads(response.text)
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pit_id = json_data["id"]
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# build query
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data = {
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"query": {"match_all": {}},
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"size": 100,
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"pit": {"id": pit_id, "keep_alive": "1m"},
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"sort": [{"_id": {"order": "asc"}}],
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}
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query_str = json.dumps(data)
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url = es_url + "/_search"
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# loop until nothing left
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all_results = []
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while True:
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response = requests.get(
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url, data=query_str, headers=headers, auth=es_auth
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)
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json_data = json.loads(response.text)
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all_hits = json_data["hits"]["hits"]
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if all_hits:
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for hit in all_hits:
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search_after = hit["sort"]
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all_results.append(hit)
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# update search_after with last hit data
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data["search_after"] = search_after
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query_str = json.dumps(data)
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else:
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break
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# clean up PIT
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query_str = json.dumps({"id": pit_id})
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requests.delete(
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es_url + "/_pit", data=query_str, headers=headers, auth=es_auth
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)
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return all_results
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@staticmethod
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def build_bulk(all_results):
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"""build bulk query data from all_results"""
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bulk_list = []
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for document in all_results:
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document_id = document["_id"]
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es_index = document["_index"]
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action = {"index": {"_index": es_index, "_id": document_id}}
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source = document["_source"]
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bulk_list.append(json.dumps(action))
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bulk_list.append(json.dumps(source))
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# add last newline
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bulk_list.append("\n")
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file_content = "\n".join(bulk_list)
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return file_content
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def write_es_json(self, file_content, index_name):
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"""write nd-json file for es _bulk API to disk"""
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cache_dir = self.config["application"]["cache_dir"]
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file_name = f"es_{index_name}-{self.timestamp}.json"
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file_path = os.path.join(cache_dir, "backup", file_name)
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with open(file_path, "w", encoding="utf-8") as f:
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f.write(file_content)
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self.backup_files.append(file_path)
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def write_ta_json(self, all_results, index_name):
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"""write generic json file to disk"""
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cache_dir = self.config["application"]["cache_dir"]
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file_name = f"ta_{index_name}-{self.timestamp}.json"
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file_path = os.path.join(cache_dir, "backup", file_name)
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to_write = [i["_source"] for i in all_results]
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file_content = json.dumps(to_write)
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with open(file_path, "w", encoding="utf-8") as f:
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f.write(file_content)
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self.backup_files.append(file_path)
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def zip_it(self):
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"""pack it up into single zip file"""
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cache_dir = self.config["application"]["cache_dir"]
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file_name = f"ta_backup-{self.timestamp}.zip"
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backup_folder = os.path.join(cache_dir, "backup")
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backup_file = os.path.join(backup_folder, file_name)
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with zipfile.ZipFile(
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backup_file, "w", compression=zipfile.ZIP_DEFLATED
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) as zip_f:
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for backup_file in self.backup_files:
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zip_f.write(backup_file, os.path.basename(backup_file))
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# cleanup
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for backup_file in self.backup_files:
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os.remove(backup_file)
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def post_bulk_restore(self, file_name):
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"""send bulk to es"""
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cache_dir = self.config["application"]["cache_dir"]
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es_url = self.config["application"]["es_url"]
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es_auth = self.config["application"]["es_auth"]
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headers = {"Content-type": "application/x-ndjson"}
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file_path = os.path.join(cache_dir, file_name)
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with open(file_path, "r", encoding="utf-8") as f:
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query_str = f.read()
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if not query_str.strip():
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return
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url = es_url + "/_bulk"
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request = requests.post(
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url, data=query_str, headers=headers, auth=es_auth
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)
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if not request.ok:
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print(request.text)
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def unpack_zip_backup(self):
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"""extract backup zip and return filelist"""
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cache_dir = self.config["application"]["cache_dir"]
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backup_dir = os.path.join(cache_dir, "backup")
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backup_files = os.listdir(backup_dir)
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all_backup_files = ignore_filelist(backup_files)
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all_available_backups = [
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i
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for i in all_backup_files
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if i.startswith("ta_") and i.endswith(".zip")
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]
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all_available_backups.sort()
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newest_backup = all_available_backups[-1]
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file_path = os.path.join(backup_dir, newest_backup)
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with zipfile.ZipFile(file_path, "r") as z:
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zip_content = z.namelist()
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z.extractall(backup_dir)
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return zip_content
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def restore_json_files(self, zip_content):
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"""go through the unpacked files and restore"""
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cache_dir = self.config["application"]["cache_dir"]
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backup_dir = os.path.join(cache_dir, "backup")
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for json_f in zip_content:
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file_name = os.path.join(backup_dir, json_f)
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if not json_f.startswith("es_") or not json_f.endswith(".json"):
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os.remove(file_name)
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continue
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print("restoring: " + json_f)
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self.post_bulk_restore(file_name)
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os.remove(file_name)
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def backup_all_indexes():
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"""backup all es indexes to disk"""
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backup_handler = ElasticBackup(INDEX_CONFIG)
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for index in backup_handler.index_config:
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index_name = index["index_name"]
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all_results = backup_handler.get_all_documents(index_name)
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file_content = backup_handler.build_bulk(all_results)
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backup_handler.write_es_json(file_content, index_name)
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backup_handler.write_ta_json(all_results, index_name)
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backup_handler.zip_it()
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def restore_from_backup():
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"""restore indexes from backup file"""
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# delete
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index_check(force_restore=True)
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# recreate
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backup_handler = ElasticBackup(INDEX_CONFIG)
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zip_content = backup_handler.unpack_zip_backup()
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backup_handler.restore_json_files(zip_content)
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def index_check(force_restore=False):
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"""check if all indexes are created and have correct mapping"""
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backed_up = False
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for index in INDEX_CONFIG:
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index_name = index["index_name"]
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expected_map = index["expected_map"]
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expected_set = index["expected_set"]
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handler = ElasticIndex(index_name, expected_map, expected_set)
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# force restore
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if force_restore:
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handler.delete_index(backup=False)
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handler.create_blank()
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continue
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# create new
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if not handler.exists:
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print(f"create new blank index with name ta_{index_name}...")
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handler.create_blank()
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continue
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# validate index
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rebuild = handler.validate()
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if rebuild:
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# make backup before rebuild
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if not backed_up:
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print("running backup first")
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backup_all_indexes()
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backed_up = True
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print(f"applying new mappings to index ta_{index_name}...")
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handler.rebuild_index()
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continue
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# else all good
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print(f"ta_{index_name} index is created and up to date...")
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