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107 lines
2.8 KiB
Nim
107 lines
2.8 KiB
Nim
# SPDX-License-Identifier: AGPL-3.0-only
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import asyncdispatch, httpclient, times, sequtils, json, random
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import strutils, tables
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import zippy
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import types, agents, consts, http_pool
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const
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maxAge = 3.hours # tokens expire after 3 hours
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maxLastUse = 1.hours # if a token is unused for 60 minutes, it expires
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failDelay = initDuration(minutes=30)
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var
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clientPool: HttpPool
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tokenPool: seq[Token]
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lastFailed: Time
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proc rateLimitError*(): ref RateLimitError =
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newException(RateLimitError, "rate limited")
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proc fetchToken(): Future[Token] {.async.} =
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if getTime() - lastFailed < failDelay:
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raise rateLimitError()
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let headers = newHttpHeaders({
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"accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
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"accept-encoding": "gzip",
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"accept-language": "en-US,en;q=0.5",
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"connection": "keep-alive",
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"user-agent": getAgent(),
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"authorization": auth
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})
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try:
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let
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resp = clientPool.use(headers): await c.postContent(activate)
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tokNode = parseJson(uncompress(resp))["guest_token"]
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tok = tokNode.getStr($(tokNode.getInt))
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time = getTime()
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return Token(tok: tok, init: time, lastUse: time)
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except Exception as e:
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lastFailed = getTime()
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echo "fetching token failed: ", e.msg
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proc expired(token: Token): bool =
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let time = getTime()
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token.init < time - maxAge or token.lastUse < time - maxLastUse
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proc isLimited(token: Token; api: Api): bool =
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if token.isNil or token.expired:
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return true
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if api in token.apis:
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let limit = token.apis[api]
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return (limit.remaining <= 5 and limit.reset > getTime())
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else:
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return false
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proc release*(token: Token; invalid=false) =
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if not token.isNil and (invalid or token.expired):
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let idx = tokenPool.find(token)
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if idx > -1: tokenPool.delete(idx)
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proc getToken*(api: Api): Future[Token] {.async.} =
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for i in 0 ..< tokenPool.len:
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if not (result.isNil or result.isLimited(api)):
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break
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release(result)
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result = tokenPool.sample()
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if result.isNil or result.isLimited(api):
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release(result)
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result = await fetchToken()
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tokenPool.add result
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if result.isNil:
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raise rateLimitError()
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proc setRateLimit*(token: Token; api: Api; remaining, reset: int) =
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token.apis[api] = RateLimit(
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remaining: remaining,
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reset: fromUnix(reset)
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)
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proc poolTokens*(amount: int) {.async.} =
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var futs: seq[Future[Token]]
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for i in 0 ..< amount:
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futs.add fetchToken()
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for token in futs:
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var newToken: Token
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try: newToken = await token
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except: discard
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if not newToken.isNil:
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tokenPool.add newToken
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proc initTokenPool*(cfg: Config) {.async.} =
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clientPool = HttpPool()
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while true:
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if tokenPool.countIt(not it.isLimited(Api.timeline)) < cfg.minTokens:
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await poolTokens(min(4, cfg.minTokens - tokenPool.len))
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await sleepAsync(2000)
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