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Use dynamicMetadata to construct metadataMatchCriteria() #3254

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May 4, 2018
Merged

Use dynamicMetadata to construct metadataMatchCriteria() #3254

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bde0c9c
Use dynamicMetadata to construct metadataMatchCriteria()
Apr 30, 2018
1747131
Fix formatting issues
Apr 30, 2018
be4fe35
Fix more tests
Apr 30, 2018
f1f12e0
Add a test for overriding metadata matcha via dynamic metadata
Apr 30, 2018
b261a23
Handle route_entry_->metadataMatchCriteria() == nullptr
May 1, 2018
663c922
Fix formatting
May 1, 2018
b24da82
Improve method docs.
May 3, 2018
d29a4a5
Return the cached result of metadataMatchCriteria()
May 3, 2018
8b7bb04
More tests
May 3, 2018
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Use dynamicMetadata to construct metadataMatchCriteria() 
This enables filter writers to construct metadataMatchCriteria()
from a RequestInfo (e.g.: header value). This is useful given
that currently routes need to be statically matched when
using metadata, e.g.:

```
---
match:
  prefix: /
route:
  cluster: cluster-name
  metadata_match:
    filter_metadata:
      envoy.lb:
        version: '1.0'
```

For setups in which RDS isn't used and routes cannot be constructed
dynamically, a filter can be used to match which endpoints should be
used.

So a filter could do something like:

```
  auto header_value = std::string(header_entry->value().getStringView());
  auto keyval = MessageUtil::keyValueStruct("version", header_value);
  callbacks_->requestInfo().setDynamicMetadata("envoy.lb", keyval);
```

to determine the version for this request.

Signed-off-by: Raul Gutierrez Segales <[email protected]>
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Raul Gutierrez Segales committed Apr 30, 2018
commit bde0c9cc4da942a785364ece6af70da2fb1d11be
12 changes: 12 additions & 0 deletions include/envoy/router/router.h
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Expand Up @@ -334,6 +334,9 @@ class MetadataMatchCriterion {

typedef std::shared_ptr<const MetadataMatchCriterion> MetadataMatchCriterionConstSharedPtr;

class MetadataMatchCriteria;
typedef std::unique_ptr<const MetadataMatchCriteria> MetadataMatchCriteriaConstPtr;

class MetadataMatchCriteria {
public:
virtual ~MetadataMatchCriteria() {}
Expand All @@ -345,6 +348,15 @@ class MetadataMatchCriteria {
*/
virtual const std::vector<MetadataMatchCriterionConstSharedPtr>&
metadataMatchCriteria() const PURE;

/**
* Creates a new MetadataMatchCriteriaImpl, merging existing
* metadata criteria this criteria. The result criteria is the
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Nit: "with this criteria"

* combination of both sets of criteria, with those from the
* ProtobufWkt::Struct taking precedence.
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Nit: which ProtobufWkt::Struct? Do you want to use @param and @return here?

*/
virtual MetadataMatchCriteriaConstPtr
mergeMatchCriteria(const ProtobufWkt::Struct& metadata_matches) const PURE;
};

/**
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2 changes: 1 addition & 1 deletion include/envoy/upstream/load_balancer.h
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Expand Up @@ -30,7 +30,7 @@ class LoadBalancerContext {
* @return Router::MetadataMatchCriteria* metadata for use in selecting a subset of hosts
* during load balancing.
*/
virtual const Router::MetadataMatchCriteria* metadataMatchCriteria() const PURE;
virtual const Router::MetadataMatchCriteria* metadataMatchCriteria() PURE;

/**
* @return const Network::Connection* the incoming connection or nullptr to use during load
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14 changes: 4 additions & 10 deletions source/common/router/config_impl.h
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Expand Up @@ -256,14 +256,8 @@ class MetadataMatchCriteriaImpl : public MetadataMatchCriteria {
MetadataMatchCriteriaImpl(const ProtobufWkt::Struct& metadata_matches)
: metadata_match_criteria_(extractMetadataMatchCriteria(nullptr, metadata_matches)){};

/**
* Creates a new MetadataMatchCriteriaImpl, merging existing
* metadata criteria this criteria. The result criteria is the
* combination of both sets of criteria, with those from the
* ProtobufWkt::Struct taking precedence.
*/
MetadataMatchCriteriaImplConstPtr
mergeMatchCriteria(const ProtobufWkt::Struct& metadata_matches) const {
MetadataMatchCriteriaConstPtr
mergeMatchCriteria(const ProtobufWkt::Struct& metadata_matches) const override {
return MetadataMatchCriteriaImplConstPtr(
new MetadataMatchCriteriaImpl(extractMetadataMatchCriteria(this, metadata_matches)));
}
Expand Down Expand Up @@ -495,7 +489,7 @@ class RouteEntryImplBase : public RouteEntry,
const std::string runtime_key_;
Runtime::Loader& loader_;
const uint64_t cluster_weight_;
MetadataMatchCriteriaImplConstPtr cluster_metadata_match_criteria_;
MetadataMatchCriteriaConstPtr cluster_metadata_match_criteria_;
HeaderParserPtr request_headers_parser_;
HeaderParserPtr response_headers_parser_;
PerFilterConfigs per_filter_configs_;
Expand Down Expand Up @@ -539,7 +533,7 @@ class RouteEntryImplBase : public RouteEntry,
std::vector<WeightedClusterEntrySharedPtr> weighted_clusters_;
const uint64_t total_cluster_weight_;
std::unique_ptr<const HashPolicyImpl> hash_policy_;
MetadataMatchCriteriaImplConstPtr metadata_match_criteria_;
MetadataMatchCriteriaConstPtr metadata_match_criteria_;
HeaderParserPtr request_headers_parser_;
HeaderParserPtr response_headers_parser_;
envoy::api::v2::core::Metadata metadata_;
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11 changes: 10 additions & 1 deletion source/common/router/router.h
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Expand Up @@ -21,6 +21,7 @@
#include "common/common/hash.h"
#include "common/common/hex.h"
#include "common/common/logger.h"
#include "common/config/well_known_names.h"
#include "common/http/utility.h"
#include "common/request_info/request_info_impl.h"

Expand Down Expand Up @@ -161,8 +162,15 @@ class Filter : Logger::Loggable<Logger::Id::router>,
}
return {};
}
const Router::MetadataMatchCriteria* metadataMatchCriteria() const override {
const Router::MetadataMatchCriteria* metadataMatchCriteria() override {
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In the retry case you may end up calling this method multiple times. Is it worth checking to see if metadata_match_ is not nullptr and returning if not? Is there any chance that doing the merge multiple times could have strange effects? If not to both of these, I would still add a comment about how this can happen multiple times for a single request.

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I think checking for nullptr and returning early is worth it. Multiple calls to merge should yield the same result, but we can avoid the computation and creating new objects.

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@mattklein123 hold on -- can the route_entry_ for a request change (e.g.: someone called clearRouteCache() and then metadataMatchCriteria() gets called again)? In that case, caching the result for metadataMatchCriteria() would be wrong... we'd want to recompute.

cc: @zuercher @htuch

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I think it's ok, as long as metadataMatchCriteria() isn't invoked until LoadBalancer::chooseHost, which happens during Router::Filter::getConnPool in Filter::decodeHeaders and again in Filter::doRetry. The route_ and route_entry_ get set in decodeHeaders before load balancing, and I believe that once that happens they do not change.

clearRouteCache operates on the Http::ConnectionManagerImpl::ActiveStreamFilterBase which ends up being the source of the route_ and therefore route_entry_ via its implementation of StreamFilterCallbacks::route().

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This seems right, can we add an ASSERT to this effect (i.e. if we get called twice, the route entry is the same)?

if (route_entry_) {
// The request's metadata, if present, takes precedence over the route's.
const auto& request_metadata = callbacks_->requestInfo().dynamicMetadata().filter_metadata();
const auto filter_it = request_metadata.find(Envoy::Config::MetadataFilters::get().ENVOY_LB);
if (filter_it != request_metadata.end()) {
metadata_match_ = route_entry_->metadataMatchCriteria()->mergeMatchCriteria(filter_it->second);
return metadata_match_.get();
}
return route_entry_->metadataMatchCriteria();
}
return nullptr;
Expand Down Expand Up @@ -343,6 +351,7 @@ class Filter : Logger::Loggable<Logger::Id::router>,
MonotonicTime downstream_request_complete_time_;
uint32_t buffer_limit_{0};
bool stream_destroyed_{};
MetadataMatchCriteriaConstPtr metadata_match_;

// list of cookies to add to upstream headers
std::vector<std::string> downstream_set_cookies_;
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2 changes: 1 addition & 1 deletion source/extensions/filters/network/redis_proxy/conn_pool_impl.h
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Expand Up @@ -166,7 +166,7 @@ class InstanceImpl : public Instance {
// TODO(danielhochman): convert to HashUtil::xxHash64 when we have a migration strategy.
// Upstream::LoadBalancerContext
absl::optional<uint64_t> computeHashKey() override { return hash_key_; }
const Router::MetadataMatchCriteria* metadataMatchCriteria() const override { return nullptr; }
const Router::MetadataMatchCriteria* metadataMatchCriteria() override { return nullptr; }
const Network::Connection* downstreamConnection() const override { return nullptr; }

const absl::optional<uint64_t> hash_key_;
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2 changes: 1 addition & 1 deletion source/extensions/filters/network/tcp_proxy/tcp_proxy.h
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Expand Up @@ -154,7 +154,7 @@ class TcpProxyFilter : public Network::ReadFilter,

// Upstream::LoadBalancerContext
absl::optional<uint64_t> computeHashKey() override { return {}; }
const Router::MetadataMatchCriteria* metadataMatchCriteria() const override {
const Router::MetadataMatchCriteria* metadataMatchCriteria() override {
if (config_) {
return config_->metadataMatchCriteria();
}
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2 changes: 1 addition & 1 deletion test/common/router/config_impl_test.cc
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Expand Up @@ -3622,7 +3622,7 @@ TEST(MetadataMatchCriteriaImpl, Merge) {
mutable_fields->insert({"b++", v2});
mutable_fields->insert({"c", v3});

MetadataMatchCriteriaImplConstPtr matches = parent_matches.mergeMatchCriteria(metadata_struct);
MetadataMatchCriteriaConstPtr matches = parent_matches.mergeMatchCriteria(metadata_struct);

EXPECT_EQ(matches->metadataMatchCriteria().size(), 4);
auto it = matches->metadataMatchCriteria().begin();
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6 changes: 5 additions & 1 deletion test/common/router/router_test.cc
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Expand Up @@ -466,8 +466,9 @@ TEST_F(RouterTest, AddMultipleCookies) {
TEST_F(RouterTest, MetadataNoOp) { EXPECT_EQ(nullptr, router_.metadataMatchCriteria()); }

TEST_F(RouterTest, MetadataMatchCriteria) {
MockMetadataMatchCriteria matches;
envoy::api::v2::core::Metadata metadata;

EXPECT_CALL(callbacks_.request_info_, dynamicMetadata()).WillRepeatedly(ReturnRef(metadata));
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I think you should modify the mock in test/mocks/request_info to return this by default.

ON_CALL(callbacks_.route_->route_entry_, metadataMatchCriteria())
.WillByDefault(Return(&callbacks_.route_->route_entry_.metadata_matches_criteria_));
EXPECT_CALL(cm_, httpConnPoolForCluster(_, _, _, _))
Expand All @@ -491,6 +492,9 @@ TEST_F(RouterTest, MetadataMatchCriteria) {
}

TEST_F(RouterTest, NoMetadataMatchCriteria) {
envoy::api::v2::core::Metadata metadata;

EXPECT_CALL(callbacks_.request_info_, dynamicMetadata()).WillRepeatedly(ReturnRef(metadata));
ON_CALL(callbacks_.route_->route_entry_, metadataMatchCriteria()).WillByDefault(Return(nullptr));
EXPECT_CALL(cm_, httpConnPoolForCluster(_, _, _, _))
.WillOnce(
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2 changes: 1 addition & 1 deletion test/common/upstream/load_balancer_benchmark.cc
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Expand Up @@ -101,7 +101,7 @@ class TestLoadBalancerContext : public LoadBalancerContext {
public:
// Upstream::LoadBalancerContext
absl::optional<uint64_t> computeHashKey() override { return hash_key_; }
const Router::MetadataMatchCriteria* metadataMatchCriteria() const override { return nullptr; }
const Router::MetadataMatchCriteria* metadataMatchCriteria() override { return nullptr; }
const Network::Connection* downstreamConnection() const override { return nullptr; }

absl::optional<uint64_t> hash_key_;
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2 changes: 1 addition & 1 deletion test/common/upstream/maglev_lb_test.cc
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Expand Up @@ -12,7 +12,7 @@ class TestLoadBalancerContext : public LoadBalancerContext {

// Upstream::LoadBalancerContext
absl::optional<uint64_t> computeHashKey() override { return hash_key_; }
const Router::MetadataMatchCriteria* metadataMatchCriteria() const override { return nullptr; }
const Router::MetadataMatchCriteria* metadataMatchCriteria() override { return nullptr; }
const Network::Connection* downstreamConnection() const override { return nullptr; }

absl::optional<uint64_t> hash_key_;
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2 changes: 1 addition & 1 deletion test/common/upstream/original_dst_cluster_test.cc
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Expand Up @@ -38,7 +38,7 @@ class TestLoadBalancerContext : public LoadBalancerContext {
// Upstream::LoadBalancerContext
absl::optional<uint64_t> computeHashKey() override { return 0; }
const Network::Connection* downstreamConnection() const override { return connection_; }
const Router::MetadataMatchCriteria* metadataMatchCriteria() const override { return nullptr; }
const Router::MetadataMatchCriteria* metadataMatchCriteria() override { return nullptr; }

absl::optional<uint64_t> hash_key_;
const Network::Connection* connection_;
Expand Down
2 changes: 1 addition & 1 deletion test/common/upstream/ring_hash_lb_test.cc
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Expand Up @@ -28,7 +28,7 @@ class TestLoadBalancerContext : public LoadBalancerContext {

// Upstream::LoadBalancerContext
absl::optional<uint64_t> computeHashKey() override { return hash_key_; }
const Router::MetadataMatchCriteria* metadataMatchCriteria() const override { return nullptr; }
const Router::MetadataMatchCriteria* metadataMatchCriteria() override { return nullptr; }
const Network::Connection* downstreamConnection() const override { return nullptr; }

absl::optional<uint64_t> hash_key_;
Expand Down
2 changes: 1 addition & 1 deletion test/common/upstream/subset_lb_test.cc
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Expand Up @@ -92,7 +92,7 @@ class TestLoadBalancerContext : public LoadBalancerContext {
// Upstream::LoadBalancerContext
absl::optional<uint64_t> computeHashKey() override { return {}; }
const Network::Connection* downstreamConnection() const override { return nullptr; }
const Router::MetadataMatchCriteria* metadataMatchCriteria() const override {
const Router::MetadataMatchCriteria* metadataMatchCriteria() override {
return matches_.get();
}

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1 change: 1 addition & 0 deletions test/mocks/router/mocks.h
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Expand Up @@ -189,6 +189,7 @@ class MockMetadataMatchCriteria : public MetadataMatchCriteria {
// Router::MetadataMatchCriteria
MOCK_CONST_METHOD0(metadataMatchCriteria,
const std::vector<MetadataMatchCriterionConstSharedPtr>&());
MOCK_CONST_METHOD1(mergeMatchCriteria, MetadataMatchCriteriaConstPtr(const google::protobuf::Struct&));
};

class MockPathMatchCriterion : public PathMatchCriterion {
Expand Down