refactor ElasticBackup and ElasticIndex for better startup handling
parent
f6c702fba7
commit
f1b89345e2
@ -0,0 +1,224 @@
|
||||
"""
|
||||
Functionality:
|
||||
- Handle json zip file based backup
|
||||
- create backup
|
||||
- restore backup
|
||||
"""
|
||||
|
||||
import json
|
||||
import os
|
||||
import zipfile
|
||||
from datetime import datetime
|
||||
|
||||
from home.src.es.connect import ElasticWrap, IndexPaginate
|
||||
from home.src.ta.config import AppConfig
|
||||
from home.src.ta.helper import get_mapping, ignore_filelist
|
||||
|
||||
|
||||
class ElasticBackup:
|
||||
"""dump index to nd-json files for later bulk import"""
|
||||
|
||||
def __init__(self, reason=False):
|
||||
self.config = AppConfig().config
|
||||
self.cache_dir = self.config["application"]["cache_dir"]
|
||||
self.timestamp = datetime.now().strftime("%Y%m%d")
|
||||
self.index_config = get_mapping()
|
||||
self.reason = reason
|
||||
|
||||
def backup_all_indexes(self):
|
||||
"""backup all indexes, add reason to init"""
|
||||
print("backup all indexes")
|
||||
if not self.reason:
|
||||
raise ValueError("missing backup reason in ElasticBackup")
|
||||
|
||||
for index in self.index_config:
|
||||
index_name = index["index_name"]
|
||||
print(f"backup: export in progress for {index_name}")
|
||||
if not self.index_exists(index_name):
|
||||
print(f"skip backup for not yet existing index {index_name}")
|
||||
continue
|
||||
|
||||
self.backup_index(index_name)
|
||||
|
||||
self.zip_it()
|
||||
if self.reason == "auto":
|
||||
self.rotate_backup()
|
||||
|
||||
@staticmethod
|
||||
def backup_index(index_name):
|
||||
"""export all documents of a single index"""
|
||||
data = {
|
||||
"query": {"match_all": {}},
|
||||
"sort": [{"_doc": {"order": "desc"}}],
|
||||
}
|
||||
paginate = IndexPaginate(
|
||||
f"ta_{index_name}", data, keep_source=True, callback=BackupCallback
|
||||
)
|
||||
_ = paginate.get_results()
|
||||
|
||||
def zip_it(self):
|
||||
"""pack it up into single zip file"""
|
||||
file_name = f"ta_backup-{self.timestamp}-{self.reason}.zip"
|
||||
folder = os.path.join(self.cache_dir, "backup")
|
||||
|
||||
to_backup = []
|
||||
for file in os.listdir(folder):
|
||||
if file.endswith(".json"):
|
||||
to_backup.append(os.path.join(folder, file))
|
||||
|
||||
backup_file = os.path.join(folder, file_name)
|
||||
|
||||
comp = zipfile.ZIP_DEFLATED
|
||||
with zipfile.ZipFile(backup_file, "w", compression=comp) as zip_f:
|
||||
for backup_file in to_backup:
|
||||
zip_f.write(backup_file, os.path.basename(backup_file))
|
||||
|
||||
# cleanup
|
||||
for backup_file in to_backup:
|
||||
os.remove(backup_file)
|
||||
|
||||
def post_bulk_restore(self, file_name):
|
||||
"""send bulk to es"""
|
||||
file_path = os.path.join(self.cache_dir, file_name)
|
||||
with open(file_path, "r", encoding="utf-8") as f:
|
||||
data = f.read()
|
||||
|
||||
if not data.strip():
|
||||
return
|
||||
|
||||
_, _ = ElasticWrap("_bulk").post(data=data, ndjson=True)
|
||||
|
||||
def get_all_backup_files(self):
|
||||
"""build all available backup files for view"""
|
||||
backup_dir = os.path.join(self.cache_dir, "backup")
|
||||
backup_files = os.listdir(backup_dir)
|
||||
all_backup_files = ignore_filelist(backup_files)
|
||||
all_available_backups = [
|
||||
i
|
||||
for i in all_backup_files
|
||||
if i.startswith("ta_") and i.endswith(".zip")
|
||||
]
|
||||
all_available_backups.sort(reverse=True)
|
||||
|
||||
backup_dicts = []
|
||||
for backup_file in all_available_backups:
|
||||
file_split = backup_file.split("-")
|
||||
if len(file_split) == 2:
|
||||
timestamp = file_split[1].strip(".zip")
|
||||
reason = False
|
||||
elif len(file_split) == 3:
|
||||
timestamp = file_split[1]
|
||||
reason = file_split[2].strip(".zip")
|
||||
|
||||
to_add = {
|
||||
"filename": backup_file,
|
||||
"timestamp": timestamp,
|
||||
"reason": reason,
|
||||
}
|
||||
backup_dicts.append(to_add)
|
||||
|
||||
return backup_dicts
|
||||
|
||||
def restore(self, filename):
|
||||
"""
|
||||
restore from backup zip file
|
||||
call reset from ElasitIndexWrap first to start blank
|
||||
"""
|
||||
zip_content = self._unpack_zip_backup(filename)
|
||||
self._restore_json_files(zip_content)
|
||||
|
||||
def _unpack_zip_backup(self, filename):
|
||||
"""extract backup zip and return filelist"""
|
||||
backup_dir = os.path.join(self.cache_dir, "backup")
|
||||
file_path = os.path.join(backup_dir, filename)
|
||||
|
||||
with zipfile.ZipFile(file_path, "r") as z:
|
||||
zip_content = z.namelist()
|
||||
z.extractall(backup_dir)
|
||||
|
||||
return zip_content
|
||||
|
||||
def _restore_json_files(self, zip_content):
|
||||
"""go through the unpacked files and restore"""
|
||||
backup_dir = os.path.join(self.cache_dir, "backup")
|
||||
|
||||
for json_f in zip_content:
|
||||
|
||||
file_name = os.path.join(backup_dir, json_f)
|
||||
|
||||
if not json_f.startswith("es_") or not json_f.endswith(".json"):
|
||||
os.remove(file_name)
|
||||
continue
|
||||
|
||||
print("restoring: " + json_f)
|
||||
self.post_bulk_restore(file_name)
|
||||
os.remove(file_name)
|
||||
|
||||
@staticmethod
|
||||
def index_exists(index_name):
|
||||
"""check if index already exists to skip"""
|
||||
_, status_code = ElasticWrap(f"ta_{index_name}").get()
|
||||
exists = status_code == 200
|
||||
|
||||
return exists
|
||||
|
||||
def rotate_backup(self):
|
||||
"""delete old backups if needed"""
|
||||
rotate = self.config["scheduler"]["run_backup_rotate"]
|
||||
if not rotate:
|
||||
return
|
||||
|
||||
all_backup_files = self.get_all_backup_files()
|
||||
auto = [i for i in all_backup_files if i["reason"] == "auto"]
|
||||
|
||||
if len(auto) <= rotate:
|
||||
print("no backup files to rotate")
|
||||
return
|
||||
|
||||
backup_dir = os.path.join(self.cache_dir, "backup")
|
||||
|
||||
all_to_delete = auto[rotate:]
|
||||
for to_delete in all_to_delete:
|
||||
file_path = os.path.join(backup_dir, to_delete["filename"])
|
||||
print(f"remove old backup file: {file_path}")
|
||||
os.remove(file_path)
|
||||
|
||||
|
||||
class BackupCallback:
|
||||
"""handle backup ndjson writer as callback for IndexPaginate"""
|
||||
|
||||
def __init__(self, source, index_name):
|
||||
self.source = source
|
||||
self.index_name = index_name
|
||||
self.timestamp = datetime.now().strftime("%Y%m%d")
|
||||
|
||||
def run(self):
|
||||
"""run the junk task"""
|
||||
file_content = self._build_bulk()
|
||||
self._write_es_json(file_content)
|
||||
|
||||
def _build_bulk(self):
|
||||
"""build bulk query data from all_results"""
|
||||
bulk_list = []
|
||||
|
||||
for document in self.source:
|
||||
document_id = document["_id"]
|
||||
es_index = document["_index"]
|
||||
action = {"index": {"_index": es_index, "_id": document_id}}
|
||||
source = document["_source"]
|
||||
bulk_list.append(json.dumps(action))
|
||||
bulk_list.append(json.dumps(source))
|
||||
|
||||
# add last newline
|
||||
bulk_list.append("\n")
|
||||
file_content = "\n".join(bulk_list)
|
||||
|
||||
return file_content
|
||||
|
||||
def _write_es_json(self, file_content):
|
||||
"""write nd-json file for es _bulk API to disk"""
|
||||
cache_dir = AppConfig().config["application"]["cache_dir"]
|
||||
file_name = f"es_{self.index_name.lstrip('ta_')}-{self.timestamp}.json"
|
||||
file_path = os.path.join(cache_dir, "backup", file_name)
|
||||
with open(file_path, "a+", encoding="utf-8") as f:
|
||||
f.write(file_content)
|
Loading…
Reference in New Issue