feat(backend): presence stats count time online from sessions in the browser time zone, capture uptime marks hours without data, presence reaches every stream of the account, message volume keeps empty days
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import json
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import asyncpg
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from utils.read.models import (
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CoverageGap,
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Page,
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PresenceDay,
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PresenceHour,
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PresenceSession,
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PresenceStats,
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PresenceSummary,
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)
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from utils.read.period import period_bounds
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from utils.read.presence import current_presence
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SECONDS_IN_HOUR = 3600
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SECONDS_IN_DAY = 86_400
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MIN_CELL_COVERAGE = 1800
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MIN_CELL_SHARE = 0.5
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STATS_WORK_MEM = "32MB"
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FUZZY_STATUSES = {"recently", "last_week", "last_month", "long_time_ago"}
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_SESSIONS = """
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marks AS (
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SELECT ts, status,
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least(next_offline_date, ts + interval '5 minutes',
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lead(coalesce(last_online_date, ts)) OVER w, $4) AS ended,
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lag(CASE WHEN status = 'online'
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THEN least(next_offline_date, ts + interval '5 minutes')
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ELSE coalesce(last_online_date, ts) END) OVER w AS previous
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FROM presence
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WHERE account_id = $1 AND peer_id = $2
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AND ts >= $3::timestamptz - interval '5 minutes' AND ts <= $4
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WINDOW w AS (ORDER BY ts)
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),
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online AS (
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SELECT greatest(ts, $3) AS started, ended,
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count(*) FILTER (WHERE previous IS NULL
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OR ts > previous + interval '5 minutes')
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OVER (ORDER BY ts) AS visit
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FROM marks
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WHERE status = 'online' AND ended > greatest(ts, $3)
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),
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sessions AS (
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SELECT min(started) AS started, max(ended) AS ended,
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extract(epoch FROM sum(ended - started))::float8 AS online_seconds
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FROM online
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GROUP BY visit
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)
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"""
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_SESSION_FIELDS = """
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started, ended, extract(epoch FROM ended - started)::float8 AS seconds,
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online_seconds, ended >= $4 AS ongoing
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"""
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_SESSION_PAGE = f"""
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WITH {_SESSIONS}
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SELECT {_SESSION_FIELDS}
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FROM sessions
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ORDER BY started DESC
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LIMIT $5 OFFSET $6
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""" # noqa: S608
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_COVERED_HOURS = """
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SELECT local_hour,
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extract(epoch FROM sum(
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least(ended, (local_hour + interval '1 hour') AT TIME ZONE $5)
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- greatest(started, local_hour AT TIME ZONE $5)))::float8 AS seconds
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FROM uptime,
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generate_series(date_trunc('hour', started AT TIME ZONE $5),
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date_trunc('hour', ended AT TIME ZONE $5),
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interval '1 hour') AS local_hour
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GROUP BY local_hour
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"""
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_STATS = f"""
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WITH {_SESSIONS},
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uptime AS (
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SELECT greatest(started_at, $3) AS started,
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least(seen_at + interval '90 seconds', $4) AS ended
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FROM capture_uptime
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WHERE account_id = $1 AND started_at < $4
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AND seen_at + interval '90 seconds' > $3
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),
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quarters AS (
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SELECT quarter, sum(ended - started - spill) AS inside, sum(spill) AS spill
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FROM (SELECT started, ended, quarter,
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greatest(ended - quarter - interval '15 minutes',
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interval '0') AS spill
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FROM (SELECT started, ended,
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date_bin('15 minutes', started, timestamptz 'epoch') AS quarter
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FROM online) binned) split
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GROUP BY quarter
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),
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online_hours AS (
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SELECT date_trunc('hour', quarter AT TIME ZONE $5) AS local_hour,
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extract(epoch FROM sum(share))::float8 AS seconds
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FROM (SELECT quarter, inside AS share FROM quarters
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UNION ALL
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SELECT quarter + interval '15 minutes', spill FROM quarters) shares
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GROUP BY 1
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),
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covered_hours AS ({_COVERED_HOURS}),
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hours AS (
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SELECT local_hour,
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extract(epoch FROM
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least((local_hour + interval '1 hour') AT TIME ZONE $5, $4)
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- greatest(local_hour AT TIME ZONE $5, $3))::float8 AS span,
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coalesce(online.seconds, 0) AS online,
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least(3600, greatest(coalesce(covered.seconds, 0),
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coalesce(online.seconds, 0))) AS covered
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FROM generate_series(date_trunc('hour', $3 AT TIME ZONE $5),
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date_trunc('hour', $4 AT TIME ZONE $5),
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interval '1 hour') AS local_hour
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LEFT JOIN online_hours AS online USING (local_hour)
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LEFT JOIN covered_hours AS covered USING (local_hour)
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),
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week AS (
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SELECT extract(isodow FROM local_hour)::int - 1 AS weekday,
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extract(hour FROM local_hour)::int AS hour,
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count(*) AS hours, sum(span) AS span,
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sum(online) AS online, sum(covered) AS covered
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FROM hours
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GROUP BY 1, 2
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),
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days AS (
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SELECT local_hour::date AS day, sum(online) AS online, sum(covered) AS covered
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FROM hours
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GROUP BY 1
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),
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uptime_reach AS (
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SELECT started,
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coalesce(max(ended) OVER (ORDER BY started
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ROWS BETWEEN UNBOUNDED PRECEDING
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AND 1 PRECEDING), $3) AS reached
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FROM uptime
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),
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gaps AS (
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SELECT reached AS started, started AS ended FROM uptime_reach
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UNION ALL
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SELECT coalesce(max(ended), $3), $4 FROM uptime
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),
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quiet AS (
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SELECT hour
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FROM week
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GROUP BY hour
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ORDER BY sum(online) / nullif(sum(covered), 0) NULLS LAST, hour
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LIMIT 1
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),
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activity_days AS (
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SELECT (sessions.started AT TIME ZONE $5) - make_interval(hours => quiet.hour)
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AS started,
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(sessions.ended AT TIME ZONE $5) - make_interval(hours => quiet.hour)
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AS ended,
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(($4 AT TIME ZONE $5) - make_interval(hours => quiet.hour))::date AS today
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FROM sessions, quiet
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),
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daily AS (
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SELECT extract(epoch FROM min(started - started::date))::float8 AS first_online,
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extract(epoch FROM max(ended - started::date))::float8 AS last_offline
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FROM activity_days
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WHERE started::date < today
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GROUP BY started::date
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)
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SELECT
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(SELECT count(*) FROM sessions) AS session_count,
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(SELECT coalesce(sum(online_seconds), 0) FROM sessions) AS online_seconds,
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(SELECT sum(covered) FROM hours) AS covered_seconds,
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(SELECT percentile_cont(0.5) WITHIN GROUP (
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ORDER BY extract(epoch FROM ended - started)) FROM sessions) AS median_session,
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(SELECT max(ended) FROM sessions) AS last_seen,
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(SELECT hour FROM quiet) AS day_start,
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(SELECT percentile_cont(0.5) WITHIN GROUP (ORDER BY first_online)
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FROM daily) AS first_online,
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(SELECT percentile_cont(0.5) WITHIN GROUP (ORDER BY last_offline)
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FROM daily) AS last_offline,
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(SELECT json_agg(json_build_object(
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'weekday', weekday, 'hour', hour, 'hours', hours, 'span', span,
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'online', online, 'covered', covered))
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FROM week) AS week,
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(SELECT json_agg(json_build_object(
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'day', day, 'online_seconds', online, 'covered_seconds', covered)
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ORDER BY day)
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FROM days) AS days,
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(SELECT json_agg(json_build_object('started', started, 'ended', ended)
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ORDER BY started)
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FROM gaps WHERE ended - started > interval '5 minutes') AS gaps,
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(SELECT json_agg(row_to_json(page) ORDER BY page.started DESC)
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FROM (SELECT {_SESSION_FIELDS} FROM sessions
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ORDER BY started DESC LIMIT $6 OFFSET $7) page) AS sessions
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""" # noqa: S608
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def _time_of_day(shifted: float | None, day_start: int | None) -> int | None:
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if shifted is None or day_start is None:
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return None
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return round(shifted + day_start * SECONDS_IN_HOUR) % SECONDS_IN_DAY
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def _week(rows: list[dict]) -> list[PresenceHour]:
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cells = {(row["weekday"], row["hour"]): row for row in rows}
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week: list[PresenceHour] = []
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for weekday in range(7):
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for hour in range(24):
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row = cells.get(
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(weekday, hour), {"hours": 0, "span": 0, "online": 0, "covered": 0}
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)
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covered = row["covered"]
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minutes = (
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min(60.0, row["online"] / covered * 60)
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if covered > 0
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and covered >= min(MIN_CELL_COVERAGE, row["span"] * MIN_CELL_SHARE)
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else None
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)
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week.append(
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PresenceHour(
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weekday=weekday,
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hour=hour,
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hours=row["hours"],
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online_minutes=minutes,
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covered_hours=covered / SECONDS_IN_HOUR,
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)
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)
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return week
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async def presence_stats( # noqa: PLR0913
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pool: asyncpg.Pool, account_id: int, peer_id: int, page: Page, *, days: int, tz: str
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) -> PresenceStats:
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since, until = await period_bounds(pool, days, tz)
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async with pool.acquire() as conn, conn.transaction():
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await conn.execute(f"SET LOCAL work_mem = '{STATS_WORK_MEM}'")
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row = await conn.fetchrow(
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_STATS,
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account_id,
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peer_id,
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since,
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until,
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tz,
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page.capped_limit,
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page.offset,
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)
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current = await current_presence(pool, account_id, peer_id)
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sessions = [PresenceSession(**item) for item in json.loads(row["sessions"] or "[]")]
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covered = row["covered_seconds"] or 0
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online = row["online_seconds"]
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return PresenceStats(
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peer_id=peer_id,
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tz=tz,
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since=since,
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until=until,
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current=current,
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online=current is not None
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and current.status == "online"
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and current.next_offline_date is not None
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and current.next_offline_date > until,
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hidden=row["session_count"] == 0
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and current is not None
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and current.status in FUZZY_STATUSES,
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summary=PresenceSummary(
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online_seconds=online,
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daily_seconds=online / covered * SECONDS_IN_DAY
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if covered >= SECONDS_IN_HOUR
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else None,
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covered_seconds=covered,
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session_count=row["session_count"],
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median_session_seconds=row["median_session"],
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first_online=_time_of_day(row["first_online"], row["day_start"]),
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last_offline=_time_of_day(row["last_offline"], row["day_start"]),
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last_seen=row["last_seen"]
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or (current.last_online_date if current else None),
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),
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week=_week(json.loads(row["week"] or "[]")),
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days=[PresenceDay(**item) for item in json.loads(row["days"] or "[]")],
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gaps=[CoverageGap(**item) for item in json.loads(row["gaps"] or "[]")],
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sessions=sessions,
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)
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async def presence_sessions( # noqa: PLR0913
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pool: asyncpg.Pool, account_id: int, peer_id: int, page: Page, *, days: int, tz: str
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) -> list[PresenceSession]:
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since, until = await period_bounds(pool, days, tz)
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rows = await pool.fetch(
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_SESSION_PAGE, account_id, peer_id, since, until, page.capped_limit, page.offset
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)
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return [PresenceSession(**dict(row)) for row in rows]
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