add InetAddr constructor from string (#31459)

NEWS.md

@@ -68,6 +68,11 @@ Standard library changes
 
 * `mean` now accepts both a function argument and a `dims` keyword ([#31576]).
 
+#### Sockets
+
+* Added `InetAddr` constructor from `AbstractString`, representing IP address, and `Integer`,
+  representing port number ([#31459]).
+
 #### Miscellaneous
 
 * `foldr` and `mapfoldr` now work on any iterator that supports `Iterators.reverse`, not just arrays ([#31781]).

stdlib/Sockets/src/IPAddr.jl

@@ -274,7 +274,36 @@ struct InetAddr{T<:IPAddr}
     port::UInt16
 end
 
+"""
+    InetAddr(ip::IPAddr, port) -> InetAddr
+
+Return an `InetAddr` object from ip address `ip` and port number `port`.
+
+# Examples
+```jldoctest
+julia> Sockets.InetAddr(ip"127.0.0.1", 8000)
+Sockets.InetAddr{IPv4}(ip"127.0.0.1", 8000)
+```
+"""
 InetAddr(ip::IPAddr, port) = InetAddr{typeof(ip)}(ip, port)
+
+"""
+    InetAddr(str::AbstractString, port) -> InetAddr
+
+Return an `InetAddr` object from ip address `str` formatted as [`AbstractString`](@ref)
+and port number `port`.
+
+!!! compat "Julia 1.3"
+    This constructor requires at least Julia 1.3.
+
+# Examples
+```jldoctest
+julia> Sockets.InetAddr("127.0.0.1", 8000)
+Sockets.InetAddr{IPv4}(ip"127.0.0.1", 8000)
+```
+"""
+InetAddr(str::AbstractString, port) = InetAddr(parse(IPAddr, str), port)
+
 function show(io::IO, addr::InetAddr)
     show(io, typeof(addr))
     print(io, "(")

stdlib/Sockets/test/runtests.jl

@@ -66,6 +66,9 @@ end
     @test inet.port == 1024
     str = "Sockets.InetAddr{$(isdefined(Main, :IPv4) ? "" : "Sockets.")IPv4}(ip\"127.0.0.1\", 1024)"
     @test sprint(show, inet) == str
+    inet = Sockets.InetAddr("127.0.0.1", 1024)
+    @test inet.host == ip"127.0.0.1"
+    @test inet.port == 1024
 end
 @testset "InetAddr invalid port" begin
     @test_throws InexactError Sockets.InetAddr(IPv4(127,0,0,1), -1)