Improve token pool to prevent rate limits
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2d788704b1
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@ -31,9 +31,6 @@ proc genHeaders*(token: Token = nil): HttpHeaders =
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"DNT": "1"
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})
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proc rateLimitError(): ref RateLimitError =
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newException(RateLimitError, "rate limited with " & getPoolInfo())
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proc fetch*(url: Uri; oldApi=false): Future[JsonNode] {.async.} =
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once:
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pool = HttpPool()
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@ -54,12 +51,16 @@ proc fetch*(url: Uri; oldApi=false): Future[JsonNode] {.async.} =
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echo resp.status, ": ", body
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result = newJNull()
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if not oldApi and resp.headers.hasKey(rl & "limit"):
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token.remaining = parseInt(resp.headers[rl & "remaining"])
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token.reset = fromUnix(parseInt(resp.headers[rl & "reset"]))
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if not oldApi and resp.headers.hasKey(rl & "reset"):
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let time = fromUnix(parseInt(resp.headers[rl & "reset"]))
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if token.reset != time:
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token.remaining = parseInt(resp.headers[rl & "limit"])
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token.reset = time
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if result.getError notin {invalidToken, forbidden, badToken}:
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token.release()
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token.lastUse = getTime()
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else:
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echo "fetch error: ", result.getError
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except Exception:
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echo "error: ", url
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raise rateLimitError()
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@ -1,4 +1,4 @@
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import asyncdispatch, httpclient, times, sequtils, json, math
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import asyncdispatch, httpclient, times, sequtils, json, math, random
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import strutils, strformat
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import types, agents, consts, http_pool
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@ -6,11 +6,20 @@ 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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minFail = initDuration(seconds=10)
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minFail = initDuration(minutes=30)
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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 < minFail:
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return Token()
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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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@ -33,7 +42,6 @@ proc fetchToken(): Future[Token] {.async.} =
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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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result = Token()
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echo "fetching token failed: ", e.msg
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proc expired(token: Token): bool {.inline.} =
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@ -49,19 +57,25 @@ proc isLimited(token: Token): bool {.inline.} =
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token.expired
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proc release*(token: Token) =
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if token != nil and not token.expired:
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token.lastUse = getTime()
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tokenPool.insert(token)
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if token != nil and token.expired:
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tokenPool.delete(tokenPool.find(token))
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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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result.release()
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result = tokenPool.pop()
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result = tokenPool.sample()
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if result.isLimited:
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result.release()
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result = await fetchToken()
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tokenPool.add result
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echo getPoolInfo()
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if result == nil:
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raise rateLimitError()
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dec result.remaining
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proc poolTokens*(amount: int) {.async.} =
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var futs: seq[Future[Token]]
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@ -69,7 +83,14 @@ proc poolTokens*(amount: int) {.async.} =
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futs.add fetchToken()
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for token in futs:
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release(await token)
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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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echo getPoolInfo()
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proc initTokenPool*(cfg: Config) {.async.} =
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clientPool = HttpPool()
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@ -78,7 +99,3 @@ proc initTokenPool*(cfg: Config) {.async.} =
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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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proc getPoolInfo*: string =
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let avg = tokenPool.mapIt(it.remaining).sum()
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return &"{tokenPool.len} tokens, average remaining: {avg}"
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