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Pass context argument by value on initialization to be clear that the
value is used/saved but not a pointer to the value. Previously the
northbound code was incorrectly holding a pointer to stack allocated
context structs.
However, the structure definition also had some musings (ifdef'd out
code) and a comment that might be taken to imply that user data could
follow the structure and thus be maintained by the code; it won't; so it
can't; so get rid of the disabled misleading code/text from the
structure definition.
The common use case worked b/c the transaction which cached the pointer
was created and freed inside a single function
call (`nb_condidate_commit`) that executed below the stack allocation.
All other use cases (grpc, confd, sysrepo, and -- coming soon -- mgmtd)
were bugs.
Signed-off-by: Christian Hopps <chopps@labn.net>
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Done with a combination of regex'ing and banging my head against a wall.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Signed-off-by: Christian Hopps <chopps@labn.net>
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The new northbound context structure contains information about
the client performing a configuration transaction. This information
will be made available to all configuration callbacks through the
args->context parameter.
The usefulness of this structure comes from the fact that it can be
used as a communication channel (both input and output) between the
northbound callbacks and the northbound clients. This can be done
through its "client_data" field which contains client-specific data.
This should cover some very specific scenarios where a northbound
callback should perform an action only if the configuration change
is coming from a given client. An example would be sending a PCEP
response to a PCE when an SR-TE policy is created or modified
through the PCEP northbound client (for that to happen, the
northbound callbacks need to have access to the PCEP request ID,
which needs to be available).
Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
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Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
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