httpbeast: option to set reusePort

httpbeast.nimble

@@ -1,6 +1,6 @@
 # Package
 
-version       = "0.3.0"
+version       = "0.4.0"
 author        = "Dominik Picheta"
 description   = "A super-fast epoll-backed and parallel HTTP server."
 license       = "MIT"

src/httpbeast.nim

@@ -54,6 +54,9 @@ type
     domain*: Domain
     numThreads: int
     loggers: seq[Logger]
+    reusePort: bool
+      ## controlls whether to fail with "Address already in use".
+      ## This is currently ignored if multiple threads are spawned.
 
   HttpBeastDefect* = ref object of Defect
 
@@ -63,14 +66,15 @@ const
 proc initSettings*(port: Port = Port(8080),
                    bindAddr: string = "",
                    numThreads: int = 0,
-                   domain = Domain.AF_INET): Settings =
-
+                   domain = Domain.AF_INET,
+                   reusePort = false): Settings =
   Settings(
     port: port,
     bindAddr: bindAddr,
     domain: domain,
     numThreads: numThreads,
-    loggers: getHandlers()
+    loggers: getHandlers(),
+    reusePort: reusePort,
   )
 
 proc initData(fdKind: FdKind, ip = ""): Data =
@@ -317,7 +321,7 @@ proc eventLoop(params: (OnRequest, Settings)) =
 
   let server = newSocket(settings.domain)
   server.setSockOpt(OptReuseAddr, true)
-  server.setSockOpt(OptReusePort, true)
+  server.setSockOpt(OptReusePort, settings.reusePort)
   server.bindAddr(settings.port, settings.bindAddr)
   server.listen()
   server.getFd().setBlocking(false)
@@ -473,8 +477,13 @@ proc run*(onRequest: OnRequest, settings: Settings) =
     when compileOption("threads"):
       var threads = newSeq[Thread[(OnRequest, Settings)]](numThreads)
       for i in 0 ..< numThreads:
+        var settings2 = settings
+        if numThreads > 1: settings2.reusePort = true
+          # TODO: in future work, we can honor `reusePort = false` by
+          # attempting to bind to the port, and then on success spawn the threads
+          # with `reusePort = false`.
         createThread[(OnRequest, Settings)](
-          threads[i], eventLoop, (onRequest, settings)
+          threads[i], eventLoop, (onRequest, settings2)
         )
       echo("Listening on port ", settings.port) # This line is used in the tester to signal readiness.
       joinThreads(threads)