Feature #3739: Expose ControlResponse body in Controller::CommandFailCallback - ndn-cxx - NDN project issue tracking system

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Feature #3739

closed

Expose ControlResponse body in Controller::CommandFailCallback

Added by Junxiao Shi over 8 years ago. Updated over 8 years ago.

Status:

Closed

Priority:

Normal

Assignee:

Junxiao Shi

Category:

Management

Target version:

v0.5

Start date:

Due date:

% Done:

100%

Estimated time:

3.00 h

Description

Currently, Controller::start<Command> fail callback only receives status code and message.
ControlResponse <body> should be exposed to the callback, so that the caller can inspect and take actions accordingly.

Related issues 1 (0 open — 1 closed)

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Updated by Junxiao Shi over 8 years ago

Blocks Bug #3232: Inaccurate log message when changing FacePersistency added

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Updated by Junxiao Shi over 8 years ago

This is necessary to implement #3232-12 procedure: when a client attempts to create a face but gets a conflict, the client needs to inspect the properties given in the response and decide whether to send an update.

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Updated by Junxiao Shi over 8 years ago

Status changed from New to In Progress

ndn::nfd::ControlResponse is an alias of ndn::mgmt::ControlResponse.
ControlResponse mismatches ControlCommand spec in that it expects exactly one TLV block in <body>, while the spec defines the <body> to be zero or more TLV blocks.

Then, to expose the <body>, ControlResponse should be given to Controller::CommandFailCallback.

This would require a backwards-incompatible change: even if I add a start overload to accept the old std::function<void(uint32_t code, const std::string& reason)> type, many callers are using bind([] (uint32_t) {}, _1) or similar when calling start, and they will get confused.

Thus, my plan is to:

change CommandFailCallback to function<void(const ControlResponse& resp)>; an internal instance of ControlResponse will be used for situations like command timeout or response validation failure
declare DatasetFailCallback as the old CommandFailCallback to use in fetch