Re: [netconf] Yangdoctors last call review of draft-ietf-netconf-https-notif-06

"Acee Lindem (acee)" <acee@cisco.com> Wed, 10 February 2021 19:03 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Mahesh Jethanandani <mjethanandani@gmail.com>
CC: "yang-doctors@ietf.org" <yang-doctors@ietf.org>, "draft-ietf-netconf-https-notif.all@ietf.org" <draft-ietf-netconf-https-notif.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "netconf@ietf.org" <netconf@ietf.org>, tom petch <ietfc@btconnect.com>
Thread-Topic: Yangdoctors last call review of draft-ietf-netconf-https-notif-06
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Date: Wed, 10 Feb 2021 19:03:49 +0000
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Subject: Re: [netconf] Yangdoctors last call review of draft-ietf-netconf-https-notif-06
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Hi Mahesh,

Thanks for the update. See some inlines.

From: Mahesh Jethanandani <mjethanandani@gmail.com>
Date: Monday, February 8, 2021 at 11:27 PM
To: Acee Lindem <acee@cisco.com>
Cc: YANG Doctors <yang-doctors@ietf.org>rg>, "draft-ietf-netconf-https-notif.all@ietf.org" <draft-ietf-netconf-https-notif.all@ietf.org>rg>, "last-call@ietf.org" <last-call@ietf.org>rg>, "netconf@ietf.org" <netconf@ietf.org>
Subject: Re: Yangdoctors last call review of draft-ietf-netconf-https-notif-06

Hi Acee,

Thank you first of all for the review of the document. You reviewed -06, and we have since submitted -07. I will in my responses reflect the changes in -07 that might affect the comments you have provided.


On Jan 27, 2021, at 9:01 AM, Acee Lindem via Datatracker <noreply@ietf.org<mailto:noreply@ietf.org>> wrote:

Reviewer: Acee Lindem
Review result: Almost Ready

The document is almost ready for WG Last Call. I have the following comments:

Model ietf-sub-notif-recv-list:

   Seems odd to have a model that adds a choice statement without any
   valid options. I realize you expect other transports in the future but
   having a separate module the one defined in the same draft seems like a
   profligate design choice.

The draft contains two models as you have noted. While the ietf-sub-notif-recv-list adds a choice statement, the second model goes on to adding a case statement for that choice statement. We could have hard coded the two models together, but believe that by separating them, we offer the flexibility to implementations that may choose not to implement both the models. Also, other transports can augment "receiver-instances", without including the entire http transport model.

Well, right now, there is only one choice for transport.

If it helps, we can add a comment to that effect in the model to explain our motivation.

That would be good although I understood the motivation. I guess this is one way to make it optional but currently the only option is both models or neither.



Model ietf-sub-notif-recv-list:
   1. The prefix "hn" seems inconsistent to lose the context. I'd use
       "snrlhn".  This wouldn't be an issue if you combined the modules.

The updated model in -07 now carries the prefix “hnt”.

That is an improvement but since this augments a model with “snr” as the prefix, it seems that should be part of the prefix. If you didn’t have a separate model, it wouldn’t be an issue. ;^) However, I’m leave it to Tom (copied) for further debate.


   2. This comment is incomprehensible:

              // create the logical impossibility of enabling "tcp"
              // transport

Would it help if we expanded the comment to say:

// The "http-client-stack-grouping” supports both HTTP and HTTPS stacks by default. This draft, however supports HTTPS only. The following
// if-feature statement makes it logically impossible to configure HTTP transport.

Yes.



In the IANA section, the security considerations for the media types
point to this draft's security considerations. However, they don't
include the referenced information. It seems these IANA references
should point to other RFCs.

The updated IANA section no longer carries the media-types.

That’s better.

Thanks,
Acee



It should be noted that ietf-subscribed-notifications has a number of YANG
errors and warnings.

I also have the following editorial comments:
Acee-Lindems-iMac-2:Desktop acee$ diff -c
draft-ietf-netconf-https-notif-06.txt.orig
draft-ietf-netconf-https-notif-06.txt ***
draft-ietf-netconf-https-notif-06.txt.orig  2021-01-27 10:06:29.000000000 -0500
--- draft-ietf-netconf-https-notif-06.txt       2021-01-27 11:57:13.000000000
-0500
***************
*** 17,23 ****
    This document defines a YANG data module for configuring HTTPS based
    configured subscription, as defined in RFC 8639.  The use of HTTPS
    maximizes transport-level interoperability, while allowing for
!    encoding selection from text, e.g.  XML or JSON, to binary.

 Status of This Memo

--- 17,23 ----
    This document defines a YANG data module for configuring HTTPS based
    configured subscription, as defined in RFC 8639.  The use of HTTPS
    maximizes transport-level interoperability, while allowing for
!    encoding selection from text, e.g.,  XML or JSON, to binary.

The abstract section has been updated.



 Status of This Memo

***************
*** 103,109 ****
    documents.  This document defines two YANG 1.1 [RFC7950] data
    modules, one for augmenting the Subscription to YANG Notifications
    [RFC8639] to add a transport type, and another for configuring and
!    managing HTTPS based receivers for the notifications.

--- 103,109 ----
    documents.  This document defines two YANG 1.1 [RFC7950] data
    modules, one for augmenting the Subscription to YANG Notifications
    [RFC8639] to add a transport type, and another for configuring and
!    managing HTTPS-based receivers for the notifications.

Fixed.



***************
*** 118,124 ****
    the same receiver instance.  The second module describes how to
    enable the transmission of YANG modeled notifications, in the
    configured encoding (i.e., XML, JSON) over HTTPS.  Notifications are
!    delivered in the form of a HTTPS POST.  The use of HTTPS maximizes
    transport-level interoperability, while the encoding selection pivots
    between implementation simplicity (XML, JSON) and throughput (text
    versus binary).
--- 118,124 ----
    the same receiver instance.  The second module describes how to
    enable the transmission of YANG modeled notifications, in the
    configured encoding (i.e., XML, JSON) over HTTPS.  Notifications are
!    delivered in the form of an HTTPS POST.  The use of HTTPS maximizes
    transport-level interoperability, while the encoding selection pivots
    between implementation simplicity (XML, JSON) and throughput (text
    versus binary).
***************

Fixed.


*** 196,202 ****

    In the case of "pipelining", the flow of messages would look
    something like this.  This example shows the flow assuming that
!    Subscribed Notifications is used and therefore a <subscription-
    started> notification is sent before sending the first notification.
    The example would be the same for when Subscribed Notification is not
    used by removing the first POST message for <susbscription-started>.
--- 196,202 ----

    In the case of "pipelining", the flow of messages would look
    something like this.  This example shows the flow assuming that
!    Subscribed Notification is used and therefore a <subscription-
    started> notification is sent before sending the first notification.
    The example would be the same for when Subscribed Notification is not
    used by removing the first POST message for <susbscription-started>.
***************

This section has been rewritten.


*** 342,350 ****

 2.1.  Introduction

!    To learn the capabilities of the receiver, the publisher can issue a
    HTTPS GET request with Accept-Type set to application/ietf-https-
!    notif-cap+xml or application/ietf-https-notif-cap+json, with latter
    as the mandatory to implement, and the default in case the type is
    not specified.  If the receiver supports capabilities such as binary
    encoding of data, it can return that as a capability in a response.
--- 342,350 ----

 2.1.  Introduction

!    To learn the capabilities of the receiver, the publisher can issue an
    HTTPS GET request with Accept-Type set to application/ietf-https-
!    notif-cap+xml or application/ietf-https-notif-cap+json, with the latter
    as the mandatory to implement, and the default in case the type is
    not specified.  If the receiver supports capabilities such as binary
    encoding of data, it can return that as a capability in a response.
***************

Fixed.


*** 450,456 ****
 Internet-Draft        HTTPS Configured Subscription        November 2020

!      Copyright (c) 2018 IETF Trust and the persons identified as
      the document authors.  All rights reserved.
      Redistribution and use in source and binary forms, with or
      without modification, is permitted pursuant to, and subject
--- 450,456 ----
 Internet-Draft        HTTPS Configured Subscription        November 2020

!      Copyright (c) 2021 IETF Trust and the persons identified as
      the document authors.  All rights reserved.
      Redistribution and use in source and binary forms, with or
      without modification, is permitted pursuant to, and subject
***************

Fixed.


*** 536,545 ****

    This YANG module is a definition of a set of receivers that are
    interested in the notifications published by the publisher.  The
!    module contains the TCP, TLS and HTTPS parameters that are needed to
    communicate with the receiver.  The module augments the ietf-sub-
    notif-recv-list module to define a transport specific receiver.  As
!    mentioned earlier, it uses POST method to deliver the notification.
    The attribute 'path' defines the path for the resource on the
    receiver, as defined by 'path-absolute' in URI Generic Syntax
    [RFC3986].  The user-id used by Network Configuration Access Control
--- 536,545 ----

    This YANG module is a definition of a set of receivers that are
    interested in the notifications published by the publisher.  The
!    module contains the TCP, TLS, and HTTPS parameters that are needed to
    communicate with the receiver.  The module augments the ietf-sub-
    notif-recv-list module to define a transport specific receiver.  As
!    mentioned earlier, it uses the POST method to deliver the notification.
    The attribute 'path' defines the path for the resource on the
    receiver, as defined by 'path-absolute' in URI Generic Syntax
    [RFC3986].  The user-id used by Network Configuration Access Control
***************

This section of the module has been rewritten.


*** 639,645 ****
      description
        "YANG module for configuring HTTPS base configuration.

!         Copyright (c) 2018 IETF Trust and the persons identified as
         the document authors.  All rights reserved.
         Redistribution and use in source and binary forms, with or
         without modification, is permitted pursuant to, and subject
--- 639,645 ----
      description
        "YANG module for configuring HTTPS base configuration.

!         Copyright (c) 2021 IETF Trust and the persons identified as
         the document authors.  All rights reserved.
         Redistribution and use in source and binary forms, with or
         without modification, is permitted pursuant to, and subject
***************

Fixed.


*** 704,710 ****

            container receiver-identity {
              description
!                "Specifies mechanism for identifying the receiver.
                 The publisher MUST NOT include any content in a
                 notification that the user is not authorized to view.";

--- 704,710 ----

            container receiver-identity {
              description
!                "Specifies the mechanism for identifying the receiver.
                 The publisher MUST NOT include any content in a
                 notification that the user is not authorized to view.";

***************

This description statement has been updated.


*** 791,801 ****

 6.  Receiving Event Notifications

!    Encoding notifications for the HTTPS notifications is the same as the
    encoding notifications as defined in RESTCONF [RFC8040] Section 6.4,
    with the following changes.  Instead of saying that for JSON-encoding
    purposes, the module name for "notification" element will be "ietf-
!    restconf, it will say that for JSON-encoding purposes, the module
    name for "notification" element will be "ietf-https-notif".

    With those changes, the SSE event notification encoded JSON example
--- 791,801 ----

 6.  Receiving Event Notifications

!    Encoding notifications for the HTTPS notifications is the same as for
    encoding notifications as defined in RESTCONF [RFC8040] Section 6.4,
    with the following changes.  Instead of saying that for JSON-encoding
    purposes, the module name for "notification" element will be "ietf-
!    restconf", it will say that for JSON-encoding purposes, the module
    name for "notification" element will be "ietf-https-notif".

    With those changes, the SSE event notification encoded JSON example
***************

This and all the following sections have been updated.

Thanks.


*** 815,826 ****

 7.  IANA Considerations

!    This document registers two URI, two YANG module and two Media Types.

 7.1.  URI Registration

    in the IETF XML registry [RFC3688].  Following the format in RFC
!    3688, the following registration is requested to be made:

    URI: urn:ietf:params:xml:ns:yang:ietf-http-notif
    URI: urn:ietf:params:xml:ns:yang:ietf-sub-notif-recv-list
--- 815,826 ----

 7.  IANA Considerations

!    This document registers two URIs, two YANG modules, and two Media Types.

 7.1.  URI Registration

    in the IETF XML registry [RFC3688].  Following the format in RFC
!    3688, the following registrations are requested to be made:

    URI: urn:ietf:params:xml:ns:yang:ietf-http-notif
    URI: urn:ietf:params:xml:ns:yang:ietf-sub-notif-recv-list
***************
*** 854,860 ****

 7.3.  Media Types

! 7.3.1.  Media Type "application/ietf-https-notif-cap+xml

 Type name: application

--- 854,860 ----

 7.3.  Media Types

! 7.3.1.  Media Type "application/ietf-https-notif-cap+xml"

 Type name: application

***************
*** 917,923 ****

 Provisional registration? (standards tree only): no

! 7.3.2.  Media Type "application/ietf-https-notif-cap+json

 Type name: application

--- 917,923 ----

 Provisional registration? (standards tree only): no

! 7.3.2.  Media Type "application/ietf-https-notif-cap+json"

 Type name: application

***************
*** 1106,1112 ****
 </config>

! 8.2.  Non Subscribed Notification based Configuration

    In the case that it is desired to use HTTPS notif outside of
    Subscribed Notifications, there would have to be a module to define
--- 1106,1112 ----
 </config>

! 8.2.  Non-Subscribed Notification based Configuration

    In the case that it is desired to use HTTPS notif outside of
    Subscribed Notifications, there would have to be a module to define

Thanks,
Acee


Mahesh Jethanandani
mjethanandani@gmail.com<mailto:mjethanandani@gmail.com>