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Added a method which tests a database connection before initiation. #4

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Merged
vkuttyp merged 1 commit into from
Feb 22, 2026
Merged

Added a method which tests a database connection before initiation. #4

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47 changes: 47 additions & 0 deletions Sources/SQLClientSwift/SQLClient.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -192,7 +192,54 @@ public actor SQLClient {

// MARK: - Synchronous Helpers

private nonisolated func checkReachability(server: String, port: UInt16) throws {
let host = CFHostCreateWithName(nil, server as CFString).takeRetainedValue()
var error = CFStreamError()
CFHostStartInfoResolution(host, .addresses, &error)

guard error.error == 0 else {
throw SQLClientError.connectionFailed(server: server)
}

// Attempt a TCP connection with a 5 second timeout
var readStream: Unmanaged<CFReadStream>?
var writeStream: Unmanaged<CFWriteStream>?
CFStreamCreatePairWithSocketToHost(nil, server as CFString, UInt32(port), &readStream, &writeStream)

guard let read = readStream?.takeRetainedValue(),
let write = writeStream?.takeRetainedValue() else {
throw SQLClientError.connectionFailed(server: server)
}

CFReadStreamOpen(read)
CFWriteStreamOpen(write)

let deadline = Date().addingTimeInterval(5)
var connected = false

while Date() < deadline {
let readStatus = CFReadStreamGetStatus(read)
let writeStatus = CFWriteStreamGetStatus(write)
if readStatus == .open && writeStatus == .open {
connected = true
break
}
Thread.sleep(forTimeInterval: 0.1)
}

CFReadStreamClose(read)
CFWriteStreamClose(write)

guard connected else {
throw SQLClientError.connectionFailed(server: server)
}
}

private nonisolated func _connectSync(options: SQLClientConnectionOptions) throws -> (login: TDSHandle, connection: TDSHandle) {
// Pre-flight — fail fast if the server isn't reachable at the TCP level.
// Default port for SQL Server is 1433.
try checkReachability(server: options.server, port: options.port ?? 1433)

dbinit()
dberrhandle(SQLClient_errorHandler)
dbmsghandle(SQLClient_messageHandler)
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