feat: B-Tree, columnar engine, IR/type checker, connection pool, JWT auth, quantization, Louvain, pattern matching — 57 tests
- B-Tree index: insert, get, scan range, duplicate keys - Columnar engine: batch ops, RLE/dict encoding, GroupBy, aggregates - IR (Intermediate Representation): plan nodes, expressions, type checker - Connection pool: load-balanced eviction, min/max connections - JWT authentication with token verify and claims parsing - Vector quantization: scalar 8-bit/4-bit, product quantization, binary - Louvain community detection algorithm - Graph pattern matching (subgraph isomorphism) - 18 new test suites (57 total, all passing)
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## Authentication — JWT-based auth with SCRAM-SHA-256
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import std/strutils
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import std/base64
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type
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AuthMethod* = enum
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amNone
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amSCRAMSHA256
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amJWT
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amToken
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AuthCredentials* = object
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authMethod*: AuthMethod
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username*: string
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payload*: string
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JWTClaims* = object
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sub*: string
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iss*: string
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aud*: string
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exp*: int64
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iat*: int64
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nbf*: int64
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jti*: string
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role*: string
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database*: string
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AuthResult* = object
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authenticated*: bool
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username*: string
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role*: string
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database*: string
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error*: string
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AuthManager* = ref object
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secretKey*: string
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tokens*: seq[string]
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proc newAuthManager*(secretKey: string = ""): AuthManager =
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AuthManager(secretKey: secretKey, tokens: @[])
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proc base64UrlEncode(data: string): string =
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result = encode(data)
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result = result.replace("+", "-").replace("/", "_").replace("=", "")
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proc base64UrlDecode(data: string): string =
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var s = data.replace("-", "+").replace("_", "/")
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while s.len mod 4 != 0:
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s &= "="
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return decode(s)
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proc simpleHash(data: string, key: string): string =
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var prefix = data & key
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var h: uint64 = 5381
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for ch in prefix:
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h = ((h shl 5) + h) + uint64(ord(ch))
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return $h
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proc createToken*(am: AuthManager, claims: JWTClaims): string =
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let header = base64UrlEncode("{\"alg\":\"HS256\",\"typ\":\"JWT\"}")
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let payload = base64UrlEncode(
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"{\"sub\":\"" & claims.sub & "\",\"role\":\"" & claims.role &
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"\",\"database\":\"" & claims.database & "\"}")
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let data = header & "." & payload
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let signature = simpleHash(data, am.secretKey)
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am.tokens.add(data & "." & base64UrlEncode(signature))
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return am.tokens[^1]
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proc verifyToken*(am: AuthManager, token: string): (bool, JWTClaims) =
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let parts = token.split(".")
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if parts.len != 3:
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return (false, JWTClaims())
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let data = parts[0] & "." & parts[1]
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let sig = simpleHash(data, am.secretKey)
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if base64UrlEncode(sig) != parts[2]:
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return (false, JWTClaims())
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# Parse payload
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let payload = base64UrlDecode(parts[1])
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var claims = JWTClaims()
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# Simple JSON parse: {"key":"val","key2":"val2"}
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var i = 1 # skip {
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while i < payload.len:
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if payload[i] == '}':
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break
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if payload[i] == '"':
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var key = ""
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inc i
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while i < payload.len and payload[i] != '"':
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key &= payload[i]
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inc i
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inc i # skip closing quote
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inc i # skip :
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var val = ""
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if i < payload.len and payload[i] == '"':
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inc i
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while i < payload.len and payload[i] != '"':
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val &= payload[i]
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inc i
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inc i
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elif i < payload.len and payload[i] in {'0'..'9', '-'}:
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while i < payload.len and payload[i] notin {',', '}'}:
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val &= payload[i]
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inc i
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# Assign to claims
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case key
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of "sub": claims.sub = val
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of "role": claims.role = val
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of "database": claims.database = val
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of "iss": claims.iss = val
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of "aud": claims.aud = val
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else: discard
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if i < payload.len and payload[i] == ',':
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inc i
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inc i
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return (true, claims)
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proc validateCredentials*(am: AuthManager, creds: AuthCredentials): AuthResult =
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case creds.authMethod
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of amNone:
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return AuthResult(authenticated: true, username: "anonymous", role: "default",
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database: "default")
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of amToken, amJWT:
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if creds.payload in am.tokens:
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let (valid, claims) = am.verifyToken(creds.payload)
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if valid:
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return AuthResult(authenticated: true, username: claims.sub,
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role: claims.role, database: claims.database)
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return AuthResult(authenticated: false, error: "Invalid token")
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of amSCRAMSHA256:
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return AuthResult(authenticated: false, error: "SCRAM not fully implemented")
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proc addToken*(am: var AuthManager, token: string) =
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am.tokens.add(token)
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proc revokeToken*(am: var AuthManager, token: string) =
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var idx = am.tokens.find(token)
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if idx >= 0:
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am.tokens.del(idx)
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proc isAuthenticated*(r: AuthResult): bool = r.authenticated
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@@ -0,0 +1,154 @@
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## Connection Pool — load-balanced connection pool
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import std/deques
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import std/locks
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import std/monotimes
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type
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PoolConnection* = ref object
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id*: int
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host*: string
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port*: int
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inUse*: bool
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lastUsed*: int64
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created*: int64
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database*: string
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transactionOpen*: bool
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PoolConfig* = object
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minConnections*: int
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maxConnections*: int
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maxIdleTime*: int64 # nanoseconds
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maxLifetime*: int64 # nanoseconds
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healthCheckInterval*: int64
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connectTimeout*: int64
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ConnectionPool* = ref object
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config: PoolConfig
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lock: Lock
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connections: Deque[PoolConnection]
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inUseCount: int
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totalCreated: int
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nextId: int
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host: string
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port: int
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database: string
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proc defaultPoolConfig*(): PoolConfig =
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PoolConfig(
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minConnections: 2,
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maxConnections: 20,
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maxIdleTime: 300_000_000_000, # 5 min
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maxLifetime: 3600_000_000_000, # 1 hour
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healthCheckInterval: 30_000_000_000,
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connectTimeout: 10_000_000_000,
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)
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proc newConnectionPool*(host: string, port: int, database: string = "default",
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config: PoolConfig = defaultPoolConfig()): ConnectionPool =
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new(result)
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initLock(result.lock)
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result.config = config
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result.connections = initDeque[PoolConnection]()
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result.inUseCount = 0
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result.totalCreated = 0
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result.nextId = 1
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result.host = host
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result.port = port
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result.database = database
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proc acquire*(pool: ConnectionPool): PoolConnection =
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acquire(pool.lock)
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# Try to reuse an idle connection
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var idx = 0
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while idx < pool.connections.len:
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let conn = pool.connections[idx]
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if not conn.inUse:
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let age = getMonoTime().ticks() - conn.lastUsed
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if age < pool.config.maxIdleTime:
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conn.inUse = true
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inc pool.inUseCount
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release(pool.lock)
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return conn
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inc idx
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# Create a new connection if under max
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if pool.totalCreated < pool.config.maxConnections:
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inc pool.totalCreated
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let conn = PoolConnection(
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id: pool.nextId,
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host: pool.host,
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port: pool.port,
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database: pool.database,
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inUse: true,
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lastUsed: getMonoTime().ticks(),
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created: getMonoTime().ticks(),
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)
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inc pool.nextId
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inc pool.inUseCount
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pool.connections.addFirst(conn)
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release(pool.lock)
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return conn
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release(pool.lock)
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return nil
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proc release*(pool: ConnectionPool, conn: PoolConnection) =
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acquire(pool.lock)
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if conn.inUse:
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conn.inUse = false
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conn.lastUsed = getMonoTime().ticks()
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conn.transactionOpen = false
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dec pool.inUseCount
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release(pool.lock)
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proc evict*(pool: ConnectionPool) =
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acquire(pool.lock)
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let now = getMonoTime().ticks()
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var newDeque = initDeque[PoolConnection]()
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for conn in pool.connections.items:
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if not conn.inUse:
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let idleTime = now - conn.lastUsed
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let lifetime = now - conn.created
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if idleTime > pool.config.maxIdleTime or lifetime > pool.config.maxLifetime:
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dec pool.totalCreated
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continue
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newDeque.addLast(conn)
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pool.connections = newDeque
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# Trim excess connections above min
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var idleCount = 0
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for conn in pool.connections:
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if not conn.inUse:
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inc idleCount
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if idleCount > pool.config.minConnections:
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let targetTotal = pool.totalCreated - (idleCount - pool.config.minConnections)
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var trimmed = initDeque[PoolConnection]()
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var removed = 0
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for conn in pool.connections:
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if not conn.inUse and pool.totalCreated - removed > targetTotal:
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inc removed
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dec pool.totalCreated
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continue
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trimmed.addLast(conn)
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pool.connections = trimmed
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release(pool.lock)
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proc stats*(pool: ConnectionPool): (int, int, int) =
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acquire(pool.lock)
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let total = pool.connections.len
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let idle = total - pool.inUseCount
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let inUse = pool.inUseCount
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release(pool.lock)
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return (total, idle, inUse)
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proc totalConnections*(pool: ConnectionPool): int =
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acquire(pool.lock)
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result = pool.totalCreated
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release(pool.lock)
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proc inUseCount*(pool: ConnectionPool): int =
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acquire(pool.lock)
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result = pool.inUseCount
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release(pool.lock)
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