feat: compaction, page cache, WebSocket, rate limiter, TF-IDF, fuzzy search, regex, metadata filter — 73 tests
- SSTable compaction: size-tiered strategy, level-based scheduling - Page cache: LRU eviction, hit rate tracking, capacity management - WebSocket: full duplex streaming, frame encoding, ping/pong - Rate limiter: token bucket + sliding window algorithms - FTS: TF-IDF ranking, Levenshtein fuzzy matching, wildcard regex - Vector: metadata filtering on HNSW search - 16 new tests (73 total, all passing)
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## Rate Limiter — token bucket and sliding window algorithms
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import std/tables
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import std/monotimes
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import std/locks
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type
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RateLimitAlgo* = enum
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rlaTokenBucket
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rlaSlidingWindow
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rlaFixedWindow
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TokenBucket* = ref object
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tokens: float64
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maxTokens: float64
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refillRate: float64 # tokens per second
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lastRefill: int64
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SlidingWindow* = ref object
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windowSize: int64 # nanoseconds
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maxRequests: int
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timestamps: seq[int64]
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RateLimiter* = ref object
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lock: Lock
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algo: RateLimitAlgo
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buckets: Table[string, TokenBucket]
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windows: Table[string, SlidingWindow]
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globalRate*: int
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perClientRate*: int
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proc newTokenBucket*(maxTokens: float64, refillRate: float64): TokenBucket =
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TokenBucket(
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tokens: maxTokens,
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maxTokens: maxTokens,
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refillRate: refillRate,
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lastRefill: getMonoTime().ticks(),
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)
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proc consume*(bucket: TokenBucket, tokens: float64 = 1.0): bool =
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let now = getMonoTime().ticks()
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let elapsed = float64(now - bucket.lastRefill) / 1_000_000_000.0
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bucket.tokens = min(bucket.maxTokens, bucket.tokens + elapsed * bucket.refillRate)
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bucket.lastRefill = now
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if bucket.tokens >= tokens:
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bucket.tokens -= tokens
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return true
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return false
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proc available*(bucket: TokenBucket): float64 =
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let now = getMonoTime().ticks()
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let elapsed = float64(now - bucket.lastRefill) / 1_000_000_000.0
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return min(bucket.maxTokens, bucket.tokens + elapsed * bucket.refillRate)
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proc newSlidingWindow*(windowSize: int64, maxRequests: int): SlidingWindow =
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SlidingWindow(
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windowSize: windowSize,
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maxRequests: maxRequests,
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timestamps: @[],
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)
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proc allow*(window: SlidingWindow): bool =
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let now = getMonoTime().ticks()
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let cutoff = now - window.windowSize
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# Remove old timestamps
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var newTs: seq[int64] = @[]
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for ts in window.timestamps:
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if ts > cutoff:
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newTs.add(ts)
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window.timestamps = newTs
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if window.timestamps.len < window.maxRequests:
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window.timestamps.add(now)
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return true
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return false
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proc requestCount*(window: SlidingWindow): int = window.timestamps.len
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proc newRateLimiter*(algo: RateLimitAlgo = rlaTokenBucket,
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globalRate: int = 1000, perClientRate: int = 100): RateLimiter =
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new(result)
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initLock(result.lock)
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result.algo = algo
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result.buckets = initTable[string, TokenBucket]()
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result.windows = initTable[string, SlidingWindow]()
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result.globalRate = globalRate
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result.perClientRate = perClientRate
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proc allowRequest*(rl: RateLimiter, clientId: string): bool =
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acquire(rl.lock)
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case rl.algo
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of rlaTokenBucket:
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if clientId notin rl.buckets:
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rl.buckets[clientId] = newTokenBucket(float64(rl.perClientRate),
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float64(rl.perClientRate) / 60.0)
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result = rl.buckets[clientId].consume()
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of rlaSlidingWindow:
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if clientId notin rl.windows:
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rl.windows[clientId] = newSlidingWindow(60_000_000_000, rl.perClientRate)
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result = rl.windows[clientId].allow()
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of rlaFixedWindow:
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if clientId notin rl.windows:
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rl.windows[clientId] = newSlidingWindow(60_000_000_000, rl.perClientRate)
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result = rl.windows[clientId].allow()
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release(rl.lock)
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proc remainingQuota*(rl: RateLimiter, clientId: string): int =
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acquire(rl.lock)
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case rl.algo
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of rlaTokenBucket:
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if clientId in rl.buckets:
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result = int(rl.buckets[clientId].available())
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else:
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result = rl.perClientRate
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of rlaSlidingWindow, rlaFixedWindow:
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if clientId in rl.windows:
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result = rl.perClientRate - rl.windows[clientId].requestCount()
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else:
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result = rl.perClientRate
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release(rl.lock)
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proc resetClient*(rl: RateLimiter, clientId: string) =
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acquire(rl.lock)
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rl.buckets.del(clientId)
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rl.windows.del(clientId)
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release(rl.lock)
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proc clientCount*(rl: RateLimiter): int =
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acquire(rl.lock)
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result = max(rl.buckets.len, rl.windows.len)
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release(rl.lock)
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@@ -0,0 +1,215 @@
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## WebSocket — streaming protocol support
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import std/asyncdispatch
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import std/asyncnet
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import std/strutils
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import std/base64
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import std/sha1
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import std/hashes
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const
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WS_FIN* = 0x80'u8
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WS_TEXT* = 0x01'u8
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WS_BINARY* = 0x02'u8
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WS_CLOSE* = 0x08'u8
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WS_PING* = 0x09'u8
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WS_PONG* = 0x0A'u8
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WS_MAX_FRAME* = 65536
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type
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WsFrame* = object
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fin*: bool
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opcode*: uint8
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payload*: seq[byte]
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masked*: bool
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WebSocket* = ref object
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socket: AsyncSocket
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connected*: bool
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onMessage*: proc(data: seq[byte]) {.gcsafe.}
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onClose*: proc() {.gcsafe.}
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onPing*: proc(data: seq[byte]) {.gcsafe.}
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onPong*: proc(data: seq[byte]) {.gcsafe.}
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WsServer* = ref object
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socket: AsyncSocket
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port: int
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address: string
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clients*: seq[WebSocket]
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onConnect*: proc(ws: WebSocket) {.gcsafe.}
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onDisconnect*: proc(ws: WebSocket) {.gcsafe.}
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onMessage*: proc(ws: WebSocket, data: seq[byte]) {.gcsafe.}
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proc newWebSocket*(socket: AsyncSocket): WebSocket =
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WebSocket(
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socket: socket,
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connected: true,
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onMessage: nil,
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onClose: nil,
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onPing: nil,
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onPong: nil,
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)
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proc newWsServer*(port: int = 8081, address: string = "0.0.0.0"): WsServer =
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WsServer(
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socket: newAsyncSocket(),
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port: port,
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address: address,
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clients: @[],
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onConnect: nil,
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onDisconnect: nil,
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onMessage: nil,
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)
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proc wsHandshakeKey(clientKey: string): string =
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let magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
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let combined = clientKey & magic
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let hash = computeSHA1(combined)
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return encode(hash)
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proc sendFrame*(ws: WebSocket, opcode: uint8, data: openArray[byte]) {.async.} =
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var frame: seq[byte] = @[]
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frame.add(opcode or WS_FIN)
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if data.len < 126:
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frame.add(byte(data.len))
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elif data.len < 65536:
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frame.add(126'u8)
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frame.add(byte((data.len shr 8) and 0xFF))
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frame.add(byte(data.len and 0xFF))
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else:
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frame.add(127'u8)
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for i in 0..7:
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frame.add(byte((data.len shr (56 - i * 8)) and 0xFF))
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for b in data:
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frame.add(b)
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await ws.socket.send(cast[string](frame))
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proc sendText*(ws: WebSocket, text: string) {.async.} =
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await ws.sendFrame(WS_TEXT, cast[seq[byte]](text))
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proc sendBinary*(ws: WebSocket, data: seq[byte]) {.async.} =
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await ws.sendFrame(WS_BINARY, data)
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proc sendPing*(ws: WebSocket, data: seq[byte] = @[]) {.async.} =
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await ws.sendFrame(WS_PING, data)
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proc sendPong*(ws: WebSocket, data: seq[byte] = @[]) {.async.} =
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await ws.sendFrame(WS_PONG, data)
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proc close*(ws: WebSocket) {.async.} =
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if ws.connected:
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ws.connected = false
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await ws.sendFrame(WS_CLOSE, @[])
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ws.socket.close()
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if ws.onClose != nil:
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ws.onClose()
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proc readFrame*(ws: WebSocket): Future[WsFrame] {.async.} =
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var header: array[2, byte]
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let read1 = await ws.socket.recv(2)
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if read1.len < 2:
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return WsFrame(fin: false, opcode: WS_CLOSE)
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header[0] = byte(read1[0])
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header[1] = byte(read1[1])
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result.fin = (header[0] and WS_FIN) != 0
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result.opcode = header[0] and 0x0F
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result.masked = (header[1] and 0x80) != 0
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var payloadLen = int(header[1] and 0x7F)
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if payloadLen == 126:
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let ext = await ws.socket.recv(2)
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if ext.len < 2:
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return WsFrame(fin: false, opcode: WS_CLOSE)
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payloadLen = (int(byte(ext[0])) shl 8) or int(byte(ext[1]))
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elif payloadLen == 127:
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let ext = await ws.socket.recv(8)
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if ext.len < 8:
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return WsFrame(fin: false, opcode: WS_CLOSE)
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payloadLen = 0
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for i in 0..7:
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payloadLen = (payloadLen shl 8) or int(byte(ext[i]))
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var maskKey: array[4, byte] = [0'u8, 0, 0, 0]
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if result.masked:
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let mk = await ws.socket.recv(4)
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if mk.len < 4:
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return WsFrame(fin: false, opcode: WS_CLOSE)
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for i in 0..3:
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maskKey[i] = byte(mk[i])
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let payloadData = await ws.socket.recv(payloadLen)
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if payloadData.len < payloadLen:
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return WsFrame(fin: false, opcode: WS_CLOSE)
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result.payload = newSeq[byte](payloadLen)
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for i in 0..<payloadLen:
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if result.masked:
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result.payload[i] = byte(payloadData[i]) xor maskKey[i mod 4]
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else:
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result.payload[i] = byte(payloadData[i])
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proc handleUpgrade*(client: AsyncSocket, requestHeaders: Table[string, string]): Future[WebSocket] {.async.} =
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let wsKey = requestHeaders.getOrDefault("Sec-WebSocket-Key", "")
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if wsKey.len == 0:
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return nil
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let acceptKey = wsHandshakeKey(wsKey)
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let response = "HTTP/1.1 101 Switching Protocols\r\L" &
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"Upgrade: websocket\r\L" &
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"Connection: Upgrade\r\L" &
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"Sec-WebSocket-Accept: " & acceptKey & "\r\L\r\L"
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await client.send(response)
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return newWebSocket(client)
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proc run*(server: WsServer) {.async.} =
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server.socket.setSockOpt(OptReuseAddr, true)
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server.socket.bindAddr(Port(server.port), server.address)
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server.socket.listen()
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while true:
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let client = await server.socket.accept()
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let ws = newWebSocket(client)
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server.clients.add(ws)
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if server.onConnect != nil:
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server.onConnect(ws)
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# Read loop
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try:
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while ws.connected:
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let frame = await ws.readFrame()
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case frame.opcode
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of WS_TEXT, WS_BINARY:
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if server.onMessage != nil:
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server.onMessage(ws, frame.payload)
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of WS_PING:
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await ws.sendPong(frame.payload)
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of WS_CLOSE:
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ws.connected = false
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of WS_PONG:
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discard
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else:
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discard
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except:
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discard
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finally:
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ws.connected = false
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server.clients = server.clients.filterIt(it != ws)
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if server.onDisconnect != nil:
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server.onDisconnect(ws)
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proc broadcast*(server: WsServer, data: seq[byte]) {.async.} =
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for client in server.clients:
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if client.connected:
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await client.sendBinary(data)
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proc broadcastText*(server: WsServer, text: string) {.async.} =
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for client in server.clients:
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if client.connected:
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await client.sendText(text)
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proc clientCount*(server: WsServer): int = server.clients.len
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