Any default values for connection hostname?

[ssorj]

If I set "host" but not "hostname" in the connection options, is there any defaulting of "hostname" done?

I'm working with somebody who is using Rhea in combination with Qpid Dispatch Router, with a vhost policy config. When they use Qpid Proton C++, it seems to default the hostname field. Rhea does not appear to.

And then, if this is truly a difference, should Rhea default it?

[ssorj]

Qpid Proton:

~$ PN_TRACE_FRM=1 qconnect
[0x55dcadbb1860]: SASL:FRAME:  -> SASL
[0x55dcadbb1860]: SASL:FRAME:  <- SASL
[0x55dcadbb1860]: AMQP:FRAME:0 <- @sasl-mechanisms(64) [sasl-server-mechanisms=@<symbol>[:GSS-SPNEGO, :GSSAPI, :DIGEST-MD5, :CRAM-MD5, :ANONYMOUS]]
[0x55dcadbb1860]: AMQP:FRAME:0 -> @sasl-init(65) [mechanism=:ANONYMOUS, initial-response=b"anonymous@localhost.localdomain"]
[0x55dcadbb1860]: AMQP:FRAME:0 <- @sasl-outcome(68) [code=0x0]
[0x55dcadbb1860]: AMQP:FRAME:  -> AMQP
[0x55dcadbb1860]: AMQP:FRAME:0 -> @open(16) [container-id="qconnect-f7732f72", hostname="localhost", channel-max=0x7fff]
[0x55dcadbb1860]: AMQP:FRAME:  <- AMQP
[0x55dcadbb1860]: AMQP:FRAME:0 <- @open(16) [container-id="broker-9c177377", channel-max=0x7fff]
qconnect-f7732f72: Connected to amqp://localhost:5672
[0x55dcadbb1860]: AMQP:FRAME:0 -> @close(24) []
[0x55dcadbb1860]:   IO:FRAME:  -> EOS
[0x55dcadbb1860]: AMQP:FRAME:0 <- @close(24) []
[0x55dcadbb1860]:   IO:FRAME:  <- EOS

Rhea:

~/code/equipage/rhea$ DEBUG=rhea* ./connect.js //localhost/abc
  rhea:io [connection-1] connected 127.0.0.1:59042 -> 127.0.0.1:5672 +0ms
  rhea:frames [connection-1] -> { protocol_id: 0, major: 1, minor: 0, revision: 0 } +0ms
  rhea:frames [connection-1]:0 -> open#10 {"container_id":"34fa3d85-cf3d-954f-9486-13929d6cd2d3"}  +3ms
  rhea:raw [connection-1] SENT: 58 0000003a02000000005310d00000002a00000001a12433346661336438352d636633642d393534662d393438362d313339323964366364326433 +0ms
  rhea:io [connection-1] read 8 bytes +5ms
  rhea:frames [connection-1] <- { protocol_id: 0, major: 1, minor: 0, revision: 0 } +1ms
  rhea:io [connection-1] read 36 bytes +0ms
  rhea:io [connection-1] got frame of size 36 +0ms
  rhea:raw [connection-1] RECV: 36 0000002402000000005310c01704a10f62726f6b65722d39633137373337374040607fff +1ms
  rhea:frames [connection-1]:0 <- open#10 {"container_id":"broker-9c177377","channel_max":32767}  +1ms
  rhea:events [connection-1] Connection got event: connection_open +0ms
  rhea:events [34fa3d85-cf3d-954f-9486-13929d6cd2d3] Container got event: connection_open +0ms
CONNECT: Connected to '//localhost/abc'
  rhea:frames [connection-1]:0 -> close#18 {}  +1ms
  rhea:raw [connection-1] SENT: 12 0000000c0200000000531845 +2ms
  rhea:io [connection-1] read 12 bytes +2ms
  rhea:io [connection-1] got frame of size 12 +0ms
  rhea:raw [connection-1] RECV: 12 0000000c0200000000531845 +0ms
  rhea:frames [connection-1]:0 <- close#18 {}  +0ms
  rhea:events [connection-1] Connection got event: connection_close +2ms
  rhea:events [34fa3d85-cf3d-954f-9486-13929d6cd2d3] Container got event: connection_close +0ms

[grs]

If you default it, how do you override that to leave it unspecified (e.g. in order to use the default, whatever that is)?

[ssorj]

https://qpid.apache.org/releases/qpid-proton-0.37.0/proton/cpp/api/classproton_1_1connection__options.html#a0300a2a68ecca3f684e91e637a45e028
https://qpid.apache.org/releases/qpid-proton-0.37.0/proton/c/api/group__connection.html#ga3ab6a8a556270cff74c39da910a89b5c
https://qpid.apache.org/releases/qpid-proton-0.37.0/proton/c/api/group__connection.html#ga3ab6a8a556270cff74c39da910a89b5c
I didn't find any guidance in the API docs on that front. I'm guessing you would have to set it to empty string or null.

[ssorj]

I noticed something else from the Rhea README.md:

"hostname - to present to remote in the open frame (defaults to host)"

https://github.com/amqp/rhea#container