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encoding/json: RawMessage should marshal without pointer receiver #6528

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augustoroman opened this issue Oct 2, 2013 · 6 comments

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commented Oct 2, 2013

The current json.RawMessage implementation defines MarshalJSON on a pointer receiver. 
This causes unexpected behavior when marshalling with non-pointer-receiver objects.

For example:
http://play.golang.org/p/Cf_6zpIKC0

Instead, MarshalJSON should be defined on a non-pointer receiver for json.RawMessage. 
This will continue to work for existing code that uses pointer-receivers, but will
change behavior to work "correctly" on code that accidentally uses
non-pointer-receivers.
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commented Oct 3, 2013

Comment 1:

Can't be changed but worth documenting.

Labels changed: added priority-later, documentation, removed priority-triage.

Status changed to Accepted.

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commented Nov 14, 2013

Comment 2 by mattyjwilliams:

What's the solution here? Adding a comment to
http://golang.org/src/pkg/encoding/json/stream.go?s=4434:4484#L175 to warn that calling
json.Marshal on a non-pointer json.RawMessage can return "meaningless" data with err ==
nil
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commented Nov 27, 2013

Comment 3:

Labels changed: added go1.3maybe.

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commented Dec 4, 2013

Comment 5:

Labels changed: added release-none, removed go1.3maybe.

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commented Dec 4, 2013

Comment 6:

Labels changed: added repo-main.

jonboulle added a commit to jonboulle/spec that referenced this issue Mar 11, 2015

schema: use pointer to json.RawMessage
RawMessage does not marshal correctly without a pointer receiver:
- golang/go#6528
- golang/go#6458 (comment)

This is only a partial solution as really we should be marshalling the
IsolatorValue rather than the RawMessage (since currently this will only
work when marshalling Isolators that have RawMessage populated).

jonboulle added a commit to jonboulle/spec that referenced this issue Mar 11, 2015

schema: use pointer to json.RawMessage
RawMessage does not marshal correctly without a pointer receiver:
- golang/go#6528
- golang/go#6458 (comment)

This is only a partial solution as really we should be marshalling the
IsolatorValue rather than the RawMessage (since currently this will only
work when marshalling Isolators that have RawMessage populated).

@rsc rsc added this to the Unplanned milestone Apr 10, 2015

kylec1 added a commit to dropbox/changes-client that referenced this issue Oct 26, 2015

Print debugConfig if supplied; fix RawMessage use
Summary:
When we use debugConfig, it's nice to say what tweaks happened in the log.
To avoid golang/go#6528, needed to switch to using *json.RawMessage.

Test Plan: Existing unit doesn't cover it, sadly, but should be quite safe.

Reviewers: nate

Reviewed By: nate

Subscribers: changesbot, anupc

Differential Revision: https://tails.corp.dropbox.com/D147620
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commented Oct 24, 2016

Dup of #14493.

@rsc rsc closed this Oct 24, 2016

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