QMFv2 - Allow endpoints to be directly addressed via a topic exchange
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Key: QPID-3032
URL: https://issues.apache.org/jira/browse/QPID-3032
Project: Qpid
Issue Type: Improvement
Components: Qpid Managment Framework
Reporter: Ted Ross
Assignee: Ted Ross
Priority: Minor
Fix For: 0.9
QMF uses a number of messaging patterns, including direct to single destination
and request-response using the reply-to header for the address of the response
message. This enhancement allows direct addressing to be done using the topic
exchange rather than the direct exchange. This has a number of advantages:
1) It allows a QMF domain to be configured using only one topic exchange, which
is simpler than pairing a direct and a topic exchange.
2) It allows security policy to be applied (details below) because the
topic-wildcard feature can be used in broker ACLs.
3) It allows for scaling into large networks of brokers where inter-broker
links are summarized and direct topic routing keys are defined hierarchically
based on topology.
Details on security policy:
With this enhancement, it is possible to write a very concise policy (using
broker ACLs) that restricts user roles to be "QMF Agent Only", or "QMF Console
Only", or any combination of these. Furthermore, since a QMF domain is tied to
an exchange, these policies can be independently applied to different domains.
Code changes needed:
1) QMFv2 implementation uses the topic exchange as the basis for direct
addresses (agent direct, and console reply-to)
2) The legacy C++ agent (qpid::agent) must be able to send a message to any
arbitrary reply-to.
3) The broker-agent must be able to send a message to any arbitrary reply-to.
Note that the broker and C++ agents currently only use the "routing-key"
portion of the reply-to. They hard-code the "exchange" portion as amq.direct.
This is arguably a bug in its own right.
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