105 lines
2.8 KiB
Nim
105 lines
2.8 KiB
Nim
# SPDX-License-Identifier: AGPL-3.0-only
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import asyncdispatch, httpclient, times, sequtils, json, math, random
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import strutils, strformat
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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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expirationTime = 3.hours
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maxLastUse = 1.hours
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resetPeriod = 15.minutes
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failDelay = initDuration(minutes=30)
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var
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clientPool {.threadvar.}: HttpPool
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tokenPool {.threadvar.}: seq[Token]
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lastFailed: Time
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proc getPoolInfo*: string =
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if tokenPool.len == 0: return "token pool empty"
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let avg = tokenPool.mapIt(it.remaining).sum() div tokenPool.len
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return &"{tokenPool.len} tokens, average remaining: {avg}"
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proc rateLimitError*(): ref RateLimitError =
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newException(RateLimitError, "rate limited with " & getPoolInfo())
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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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var
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resp: string
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tokNode: JsonNode
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tok: string
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try:
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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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let time = getTime()
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result = Token(tok: tok, remaining: 187, reset: time + resetPeriod,
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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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template expired(token: Token): untyped =
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let time = getTime()
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token.init < time - expirationTime or
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token.lastUse < time - maxLastUse
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template isLimited(token: Token): untyped =
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token == nil or (token.remaining <= 5 and token.reset > getTime()) or
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token.expired
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proc release*(token: Token; invalid=false) =
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if token != nil 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*(): Future[Token] {.async.} =
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for i in 0 ..< tokenPool.len:
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if not result.isLimited: break
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release(result)
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result = tokenPool.sample()
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if result.isLimited:
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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 == nil:
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raise rateLimitError()
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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 newToken != nil:
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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) < 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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