* rds: add source IP and (generated) cookie hash policies.
There is room to grow the affinity policy now to arbitrary hashing on
connection properties (e.g. 3 tuple, 5 tuple, etc.) but we only care
about source IP address today.
Fixes#69.
* Clarify TTL wording.
* Document passive vs. generated cookie affinity behaviors.
Rename ForwardAction to RouteAction as requests are not really "forwarded". There is fair amount of mutation, traffic splitting, neither of which implies "forwarding". c.f. Istio route rules.
Add metadata to endpoints in EDS.
Allow routes to specify a metadata_match. WeightedClusters can further
specify an additional metadata_match based on weighting.
Log all metadata. It makes sense to have available to the logging
pipeline all metadata used during request processing, not just some
that is explicitly annotated. This then makes available the endpoint's
metadata for log consumption. The tradeoff is that this will increase
log sizes when metadata is plentiful. We may want to consider a way to
filter this in logs in the future.
Fixes#81 and #91.
We can dynamically discover service/method descriptors in Envoy, so we
don't need to generate any C++ stubs for this. This simplifies the
Google import and removes an unnecessary build output.
* Factor all subscription responses to DiscoveryResponse message with an Any
resource type. This further simplifies the Subscription interface in
the Envoy client, as it no longer needs to be templatized on the
response type.
* Replace version_info bytes type with string. This allows plain
strings to be used in JSON representations rather than base64 encoded
strings as required in the canonical proto3 translation of bytes.
* Clarify ACK/NACK semantics with version_info in comments.
Fixes#85.
This PR allows for easier implementation of a unified subscription model
in Envoy for gRPC/REST/inotify filesystem config updates:
* The DiscoveryRequest basically looks the same in all subscription APIs
today, so factored out to DiscoveryRequest.
* xDiscoveryResponse now uses a consistent convention. This will allow
C++ template level duck typing to populate the response in a single
implementation for all APIs. This is mostly relevant for the filesystem
watch implementation, where we need to map from resource names to file
paths, but could also make API server implementation easier
potentially.
While still supporting only 2 priorities today, this PR leaves room for
an additional finite number of priorities via enum extension. Since
we're not planning on reflecting arbitrary downstream priorities in the
upstream connection, we only expect a small number of priorities to be
useful in configuring routes and clusters.
Fixes#1.
There are multiple uses for opaque metadata that is associated with the
specific listener/filter chain/route that a request matches on:
1. Logging. Similar to header values, we can log the metadata values.
A listener might belong to a higher level concept in the
configuration language that generated LDS protos, e.g. there might be
a rule identifier expressed. This metadata allows logs to reflect the
rule identifier.
2. Future custom stats backends might use metadata to guide where and
how stats are emitted. E.g. the metadata might include information
about which stats collector to emit to.
3. Proprietary filters can receive additional inputs via the metadata.
The per-filter metadata generalizes and replaces the opaque_config in
RDS ForwardAction.
The metadata is structured such that each filter's metadata is under the
reverse DNS namespace defined by the filter. Shared metadata may be
arranged by coordinating on the reverse DNS namespace.
As an example, the "envoy.http_connection_manager.access_log" filter
namespace is suggested to be used for HTTP access logging.
Fixes#33.
As previously pointed out in #9, the empty string is not generally a useful
value in the xDS APIs, so can be be considered equivalent to an unset
field. This is now documented in principles in #28 as well.
Also replace google.protobuf.BytesValue with bytes.
htuch
Shriram Rajagopalan
tschroed
Matt Klein
Piotr Sikora
Harvey Tuch