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db.py
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db.py
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import datetime
import os
import psycopg2
from psycopg2.extensions import ISOLATION_LEVEL_READ_COMMITTED
from pydantic import BaseModel
DATABASE = os.environ.get('DATABASE_URL') or 'postgresql://web:web@localhost:5432/status_board'
HEARTBEAT_LOG_INTERVAL_MINUTES = 60
def gmt2jst(dt: datetime.datetime):
return dt.astimezone(datetime.timezone(datetime.timedelta(hours=+9)))
class Device(BaseModel):
device_name: str
last_heartbeat_timestamp: datetime.datetime
report: str
return_message: str
is_active: bool
def read_JWT_secret() -> str:
"""
Read JWT secret
:return: JWT secret
"""
with psycopg2.connect(DATABASE) as conn:
with conn.cursor() as cur:
cur.execute("select secret from jwt;")
res: list[str] = cur.fetchone()
return res[0]
def read_password_from_users(name: str) -> bytes:
"""
Read user's password
:return: Hashed password if user exists.
"""
SQL = """
SELECT hashed_password
FROM users
WHERE user_name = %s;
"""
with psycopg2.connect(DATABASE) as conn:
with conn.cursor() as cur:
cur.execute(SQL, (name,))
res = cur.fetchone()
if res is None:
raise ValueError("User not exist:", name)
return res[0].tobytes()
def select_devices() -> list[Device]:
"""
:return: list of Device
"""
SQL = """
SELECT device_name, last_heartbeat, report, return_message, is_active
FROM devices
ORDER BY device_name asc; -- this sort should be in javascript
"""
with psycopg2.connect(DATABASE) as sess:
sess.isolation_level = ISOLATION_LEVEL_READ_COMMITTED
with sess.cursor() as cur:
cur.execute(SQL)
res: list[tuple] = cur.fetchall()
return [Device(**{
'device_name': tp[0],
'last_heartbeat_timestamp': gmt2jst(tp[1]),
'report': tp[2],
'return_message': tp[3],
'is_active': tp[4],
}) for tp in res]
def select_heartbeat_log_summation(period_of_hour: int = 24):
SQL = """
SELECT heartbeat_ts, COUNT(device_id)
FROM public.heartbeat_log
WHERE heartbeat_ts > %s
GROUP BY heartbeat_ts
ORDER BY heartbeat_ts ASC;
"""
start_dt = datetime.datetime.now() - datetime.timedelta(hours=period_of_hour)
data_max_size = int(60 / HEARTBEAT_LOG_INTERVAL_MINUTES * 24)
with psycopg2.connect(DATABASE) as sess:
sess.isolation_level = ISOLATION_LEVEL_READ_COMMITTED
with sess.cursor() as cur:
cur.execute(SQL, (start_dt,))
res: tuple[str] = cur.fetchall()
if len(res) > data_max_size:
res = res[len(res) - data_max_size:]
elif len(res) < data_max_size:
res = [['', 0] for _ in range(data_max_size - len(res))] + res
return res
def select_report(dev_name: str) -> str:
"""
:return: report of a device
"""
SQL = """
SELECT report
FROM devices
WHERE device_name = %s;
"""
with psycopg2.connect(DATABASE) as sess:
sess.isolation_level = ISOLATION_LEVEL_READ_COMMITTED
with sess.cursor() as cur:
cur.execute(SQL, (dev_name,))
res: tuple[str] = cur.fetchone()
return res[0] # return single value
def select_return_message(dev_name: str) -> str:
"""
:return: return_message of a device
"""
SQL = """
SELECT return_message
FROM devices
WHERE device_name = %s;
"""
with psycopg2.connect(DATABASE) as sess:
sess.isolation_level = ISOLATION_LEVEL_READ_COMMITTED
with sess.cursor() as cur:
cur.execute(SQL, (dev_name,))
res: tuple[str] = cur.fetchone()
return res[0] # return single value
def select_device_reports() -> list[tuple]:
"""
:return: list of (device_name, report)
"""
SQL = """
SELECT device_name, report
FROM devices
ORDER BY device_name ASC;
"""
with psycopg2.connect(DATABASE) as sess:
sess.isolation_level = ISOLATION_LEVEL_READ_COMMITTED
with sess.cursor() as cur:
cur.execute(SQL)
res = cur.fetchall()
return res
#################################################################################
# Insert, Update below ...
def post_heartbeat(dev_name: str, report: str|None):
SQL1 = """
SELECT device_name
FROM devices;
"""
SQL2 = """
UPDATE devices
SET last_heartbeat = current_timestamp,
report = %s
WHERE device_name = %s;
"""
with psycopg2.connect(DATABASE) as sess:
sess.isolation_level = ISOLATION_LEVEL_READ_COMMITTED
with sess.cursor() as cur:
cur.execute(SQL1)
valid_devices: set[str] = set(tp[0] for tp in cur.fetchall())
if dev_name not in valid_devices:
raise ValueError('invalid device name')
cur.execute(SQL2, (report if report is not None else '', dev_name))
sess.commit()
def update_return_message(dev_name: str, return_message: str):
SQL = """
UPDATE devices
SET return_message = %s
WHERE device_name = %s;
"""
with psycopg2.connect(DATABASE) as sess:
sess.isolation_level = ISOLATION_LEVEL_READ_COMMITTED
with sess.cursor() as cur:
cur.execute(SQL, (return_message, dev_name))
sess.commit()
def update_is_active(dev_name: str, is_active: bool):
SQL = """
UPDATE devices
SET is_active = %s
WHERE device_name= %s;
"""
with psycopg2.connect(DATABASE) as sess:
sess.isolation_level = ISOLATION_LEVEL_READ_COMMITTED
with sess.cursor() as cur:
cur.execute(SQL, (is_active, dev_name))
sess.commit()
def register_device(dev_name: str, report: str|None, return_message: str|None):
SQL1 = """
INSERT INTO public.devices (device_name, report, return_message) VALUES
(%s, %s, %s);
"""
with psycopg2.connect(DATABASE) as sess:
sess.isolation_level = ISOLATION_LEVEL_READ_COMMITTED
try:
with sess.cursor() as cur:
cur.execute(SQL1, (
dev_name,
report if report is not None else '',
return_message if return_message is not None else ''
))
sess.commit()
except psycopg2.errors.UniqueViolation:
raise ValueError('already registered device:', dev_name)
def insert_heartbeat_log(dev_name: str, minute_interval: int = HEARTBEAT_LOG_INTERVAL_MINUTES):
now = datetime.datetime.now()
now = now.replace(microsecond=0, second=0, minute=(now.minute - now.minute % minute_interval))
SQL1 = """
INSERT INTO public.heartbeat_log (device_id, heartbeat_ts) VALUES
((SELECT device_id FROM public.devices WHERE device_name = %s), %s);
"""
with psycopg2.connect(DATABASE) as sess:
sess.isolation_level = ISOLATION_LEVEL_READ_COMMITTED
try:
with sess.cursor() as cur:
cur.execute(SQL1, (
dev_name,
now,
))
sess.commit()
except psycopg2.errors.UniqueViolation:
pass
if now.hour == 12 and now.minute == 0:
clean_heartbeat_log()
def clean_heartbeat_log():
past_1_week = datetime.datetime.now() - datetime.timedelta(days=7)
SQL1 = """
DELETE FROM public.heartbeat_log WHERE heartbeat_ts < %s;
"""
with psycopg2.connect(DATABASE) as sess:
sess.isolation_level = ISOLATION_LEVEL_READ_COMMITTED
with sess.cursor() as cur:
cur.execute(SQL1, (
past_1_week,
))
sess.commit()