Add prepare callback to connect()

[laurent-aml]

connect() is missing the prepare callback, similarly to what AnyEvent::Socket::tcp_connect provides.
I suggest:

@@ -70,7 +70,7 @@ has max_payload_size => (
 
 sub connect
 {
-  my($self, $uri) = @_;
+  my($self, $uri, $preparecb) = @_;
   unless(ref $uri)
   {
     require URI;
@@ -167,7 +167,10 @@ sub connect
         undef $done;
       }
     });
-  }, sub { $self->timeout };
+  }, sub {
+    my $timeout = $preparecb->(@_) if defined $preparecb;
+    return $timeout || $self->timeout;
+  };
   $done;
 }

[plicease]

Looks reasonable. This ( + documentation + a test ) would make a good PR.

[plicease]

I am not sure but I think I'd like the prepare callback to be a attribute on the client object.

[plicease]

Although I am not sure, I did try implementing it as an optional last argument on the connect function here:

6fd9014

arguably this is more like the AnyEvent::Socket interface, especially now that we are going to have optional host and port overrides.

[laurent-aml]

I was about to revisit this. Thanks for your work on this.
Your patch looks good, except that it does not fallback to the default timeout if the prepare callback returns 0/undef (which is the behavior of AnyEvent::Socket).

Suggestion:

@@ -83,7 +83,10 @@ has env_proxy => (
 
 sub connect
 {
-  my($self, $uri, $host, $port) = @_;
+  my $self = shift;
+  my $uri = shift;
+  my $prepare_cb = pop if ref $_[-1] eq 'CODE';
+  my($host, $port) = @_;
   unless(ref $uri)
   {
     require URI;
@@ -184,7 +187,10 @@ sub connect
         undef $done;
       }
     });
-  }, sub { $self->timeout });
+  }, sub {
+    my $timeout = $prepare_cb->(@_) if defined $prepare_cb;
+    return $timeout || $self->timeout;
+  });
   $done;
 }