|
| 1 | +from __future__ import annotations |
| 2 | + |
| 3 | +import asyncio |
| 4 | +from datetime import datetime, timezone |
| 5 | +from typing import Optional, Tuple |
| 6 | + |
| 7 | +import asyncpg |
| 8 | + |
| 9 | +from ..config import settings |
| 10 | + |
| 11 | + |
| 12 | +def _dsn() -> str: |
| 13 | + db = settings.db |
| 14 | + return f"postgresql://{db.user}:{db.password}@{db.host}:{db.port}/{db.database}" |
| 15 | + |
| 16 | + |
| 17 | +def _period_start(dt: Optional[datetime] = None) -> datetime: |
| 18 | + dt = dt or datetime.now(timezone.utc) |
| 19 | + # Monthly period boundary (first day of month at 00:00 UTC) |
| 20 | + return datetime(dt.year, dt.month, 1, tzinfo=timezone.utc) |
| 21 | + |
| 22 | + |
| 23 | +async def _ensure_async(conn: asyncpg.Connection) -> None: |
| 24 | + await conn.execute( |
| 25 | + """ |
| 26 | + CREATE TABLE IF NOT EXISTS bot_credits_user ( |
| 27 | + user_id BIGINT NOT NULL, |
| 28 | + period_start TIMESTAMPTZ NOT NULL, |
| 29 | + used_credits INTEGER NOT NULL DEFAULT 0, |
| 30 | + updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(), |
| 31 | + PRIMARY KEY (user_id, period_start) |
| 32 | + ); |
| 33 | + CREATE INDEX IF NOT EXISTS idx_bot_credits_user_period ON bot_credits_user(period_start); |
| 34 | + CREATE TABLE IF NOT EXISTS bot_credits_global ( |
| 35 | + period_start TIMESTAMPTZ PRIMARY KEY, |
| 36 | + used_credits INTEGER NOT NULL DEFAULT 0, |
| 37 | + updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW() |
| 38 | + ); |
| 39 | + """ |
| 40 | + ) |
| 41 | + |
| 42 | + |
| 43 | +def ensure_store() -> None: |
| 44 | + async def run(): |
| 45 | + conn = await asyncpg.connect(_dsn()) |
| 46 | + try: |
| 47 | + await _ensure_async(conn) |
| 48 | + finally: |
| 49 | + await conn.close() |
| 50 | + |
| 51 | + asyncio.run(run()) |
| 52 | + |
| 53 | + |
| 54 | +def _credits_for_text_chars(in_chars: int, out_est_tokens: int) -> int: |
| 55 | + tokens_in = int(round(in_chars * float(settings.credit_tokens_per_char))) |
| 56 | + tokens_total = tokens_in + int(out_est_tokens) |
| 57 | + per_k = float(settings.credit_per_1k_tokens) or 1.0 |
| 58 | + # credits ~ tokens_total / 1000 * per_k |
| 59 | + credits = int((tokens_total + 999) // 1000 * per_k) |
| 60 | + return max(1, credits) |
| 61 | + |
| 62 | + |
| 63 | +def estimate_credits_for_question(question: str) -> int: |
| 64 | + return _credits_for_text_chars(len(question or ""), int(settings.credit_est_output_tokens)) |
| 65 | + |
| 66 | + |
| 67 | +def pre_authorize(user_id: int, est_credits: int, *, now: Optional[datetime] = None, user_limit_override: Optional[int] = None) -> Tuple[bool, int, int]: |
| 68 | + """Reserve credits if within per-user limit and global cap. |
| 69 | +
|
| 70 | + Returns (ok, user_used_after, global_used_after). If ok is False, no change. |
| 71 | + """ |
| 72 | + period = _period_start(now) |
| 73 | + |
| 74 | + async def run() -> Tuple[bool, int, int]: |
| 75 | + conn = await asyncpg.connect(_dsn()) |
| 76 | + try: |
| 77 | + await _ensure_async(conn) |
| 78 | + async with conn.transaction(): |
| 79 | + # Load current usage |
| 80 | + row_u = await conn.fetchrow( |
| 81 | + "SELECT used_credits FROM bot_credits_user WHERE user_id=$1 AND period_start=$2", |
| 82 | + int(user_id), |
| 83 | + period, |
| 84 | + ) |
| 85 | + user_used = int(row_u[0]) if row_u else 0 |
| 86 | + row_g = await conn.fetchrow( |
| 87 | + "SELECT used_credits FROM bot_credits_global WHERE period_start=$1", |
| 88 | + period, |
| 89 | + ) |
| 90 | + global_used = int(row_g[0]) if row_g else 0 |
| 91 | + |
| 92 | + user_limit = int(user_limit_override or settings.credit_default_limit) |
| 93 | + # Limit can be overridden by ranks; resolved outside and passed? For now use default; the caller can pass a higher est or pre-check limit. |
| 94 | + # Enforce limits |
| 95 | + if settings.credit_enabled: |
| 96 | + if user_used + est_credits > user_limit: |
| 97 | + return False, user_used, global_used |
| 98 | + if global_used + est_credits > int(settings.credit_global_cap): |
| 99 | + return False, user_used, global_used |
| 100 | + |
| 101 | + # Upsert increments |
| 102 | + await conn.execute( |
| 103 | + """ |
| 104 | + INSERT INTO bot_credits_user(user_id, period_start, used_credits) |
| 105 | + VALUES ($1, $2, $3) |
| 106 | + ON CONFLICT (user_id, period_start) |
| 107 | + DO UPDATE SET used_credits = bot_credits_user.used_credits + EXCLUDED.used_credits, updated_at=NOW() |
| 108 | + """, |
| 109 | + int(user_id), |
| 110 | + period, |
| 111 | + int(est_credits), |
| 112 | + ) |
| 113 | + await conn.execute( |
| 114 | + """ |
| 115 | + INSERT INTO bot_credits_global(period_start, used_credits) |
| 116 | + VALUES ($1, $2) |
| 117 | + ON CONFLICT (period_start) |
| 118 | + DO UPDATE SET used_credits = bot_credits_global.used_credits + EXCLUDED.used_credits, updated_at=NOW() |
| 119 | + """, |
| 120 | + period, |
| 121 | + int(est_credits), |
| 122 | + ) |
| 123 | + return True, user_used + est_credits, global_used + est_credits |
| 124 | + finally: |
| 125 | + await conn.close() |
| 126 | + |
| 127 | + return asyncio.run(run()) |
| 128 | + |
| 129 | + |
| 130 | +def adjust_usage(user_id: int, delta: int, *, now: Optional[datetime] = None) -> None: |
| 131 | + """Adjust usage by delta (can be negative). Best-effort.""" |
| 132 | + if delta == 0: |
| 133 | + return |
| 134 | + period = _period_start(now) |
| 135 | + |
| 136 | + async def run(): |
| 137 | + conn = await asyncpg.connect(_dsn()) |
| 138 | + try: |
| 139 | + await _ensure_async(conn) |
| 140 | + async with conn.transaction(): |
| 141 | + await conn.execute( |
| 142 | + """ |
| 143 | + INSERT INTO bot_credits_user(user_id, period_start, used_credits) |
| 144 | + VALUES ($1, $2, $3) |
| 145 | + ON CONFLICT (user_id, period_start) |
| 146 | + DO UPDATE SET used_credits = GREATEST(0, bot_credits_user.used_credits + EXCLUDED.used_credits), updated_at=NOW() |
| 147 | + """, |
| 148 | + int(user_id), period, int(delta) |
| 149 | + ) |
| 150 | + await conn.execute( |
| 151 | + """ |
| 152 | + INSERT INTO bot_credits_global(period_start, used_credits) |
| 153 | + VALUES ($1, $2) |
| 154 | + ON CONFLICT (period_start) |
| 155 | + DO UPDATE SET used_credits = GREATEST(0, bot_credits_global.used_credits + EXCLUDED.used_credits), updated_at=NOW() |
| 156 | + """, |
| 157 | + period, int(delta) |
| 158 | + ) |
| 159 | + finally: |
| 160 | + await conn.close() |
| 161 | + |
| 162 | + asyncio.run(run()) |
| 163 | + |
| 164 | + |
| 165 | +def resolve_user_limit_from_roles(*, member_roles: list[tuple[int, str]]) -> int: |
| 166 | + """Compute per-user credit limit based on configured rank mappings and role names/ids. |
| 167 | +
|
| 168 | + member_roles: list of (role_id, role_name) |
| 169 | + """ |
| 170 | + # Determine rank candidates from roles |
| 171 | + by_name = settings.credit_role_ranks_by_name or {} |
| 172 | + by_id = settings.credit_role_ranks_by_id or {} |
| 173 | + ranks: set[str] = set() |
| 174 | + for rid, name in member_roles: |
| 175 | + if name and name in by_name: |
| 176 | + ranks.add(by_name[name]) |
| 177 | + s_rid = str(rid) |
| 178 | + if s_rid in by_id: |
| 179 | + ranks.add(by_id[s_rid]) |
| 180 | + # Map ranks to limits and take max |
| 181 | + rank_limits = settings.credit_rank_limits or {} |
| 182 | + max_limit = int(settings.credit_default_limit) |
| 183 | + for r in ranks: |
| 184 | + lim = rank_limits.get(r) |
| 185 | + if isinstance(lim, int) and lim > max_limit: |
| 186 | + max_limit = lim |
| 187 | + return max_limit |
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