This commit swaps to using a Sync task to place generated code in the
src/generated folder instead of the gradle-protobuf-plugin's
generatedFilesBaseDir. This provides much nicer results on failed
builds, and you will no longer see all the generated files deleted.
But at the same time the Sync task makes it easy to only copy the
grpc-generated code. This was not previously done because we were lazy
and using generatedFilesBaseDir, which made it difficult to treat the
services differently from the messages.
The LoadBalancingConfig message, which looks like
```json
{
"policy_name" : {
"config_key1" : "config_value1",
"config_key2" : "config_value2"
}
}
```
appears multiple times. It gets super tedious and confusing to handle, because both the whole config and the value (in the above example is `{ "config_key1" : "config_value1" }`) are just `Map<String, Object>`, and each user needs to do the following validation:
1. The whole config must have exactly one key
2. The value must be a map
Here I define `LbConfig` that holds the policy name and the config value, and a method in `ServiceConfigUtil` that converts the parsed JSON format into `LbConfig`.
There is also multiple cases where you need to handle a list of configs (top-level balancing policy, child and fallback policies in xds, grpclb child policies). I also made another helper method in `ServiceConfigUtil` to convert them into `List<LbConfig>`.
Found and fixed a bug in the xds code, where the top-level balancer should pass the config value (excluding the policy name), not the whole config to the child balancers. Search for "supported_1_option" in the diff to see it in the tests.
added fallback handling
in addition:
- made XdsLbState not abstract for now
- did not include graceful swapping balancers when service config change, for now just shutdown the old one and use the new one.
* Import envoy proto file to the latest internal version, which has correct java proto options. (The PGV proto, `validate.proto`, doesn't have the correct and up-to-date java_package proto option yet, but as long as we don't use those generated classes, it seems fine.)
* Stop modifying java proto options by import.sh.
* Apply shadow plugin when publishing.
For Bazel, we upgrade to protobuf 3.6.1.2 and javalite HEAD to fix
incompatibilities in newer Bazel releases.
compiler/Dockerfile is unused, so it was removed instead of being updated.
protoc no longer includes codegen for nano, so we remain on the older protoc
any time nano is used.
Protobuf now requires C++11 when compiling, so windows was swapped to
VC 14.
- defined XdsLbState, playing a similar role to GrpclbState
- there are two modes of XdsLbState: STANDARD and CUSTOM
- on `XdsLoadBalancer.handleResolvedAddressGroups()`, the `xdsLoadBalancer` will update the `xdsLbState` based on the lb config in the attributes passed in
All files other than the following are generated by `import.sh`.
```
settings.gradle
xds/build.gradle
xds/third_party/envoy/import.sh
xds/third_party/protoc-gen-validate/import.sh
```
ZHANG Dapeng
Tim van der Lippe
Carl Mastrangelo
Eric Anderson
Kun Zhang