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api/services: define the introspection API

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After several requests for information about platform support,
configuration introspection and feature switches, we now have a solution
that should work in all these use cases. The Introspection API hooks
into the plugin subsystem registration process. During registration,
plugins declare several pieces of information, allowing clients to
discover the cababilities and support that a containerd instance
provides, including whether or not it loaded with an error.

To allow symmetrical error reporting, the `google/rpc.Status` protobuf
definitions have been brought in from the googleapis project.
Unfortunately, we had to generate these in place to match our protobuf
system.

Once we like this design, we can add an implementation to integrate it
directly with the plugin system.

Enjoy!

Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day
2017-10-04 16:48:20 -07:00
parent 12c79cc0d9
commit 363d692f35
18 changed files with 5678 additions and 5 deletions
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6
Protobuild.toml
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@@ -7,12 +7,12 @@ plugins = ["grpc", "fieldpath"]
[includes]
# Include paths that will be added before all others. Typically, you want to
# treat the root of the project as an include, but this may not be necessary.
# before = ["."]
before = ["./protobuf"]
# Paths that should be treated as include roots in relation to the vendor
# directory. These will be calculated with the vendor directory nearest the
# target package.
vendored = ["github.com/gogo/protobuf"]
packages = ["github.com/gogo/protobuf"]
# Paths that will be added untouched to the end of the includes. We use
# `/usr/local/include` to pickup the common install location of protobuf.
@@ -27,6 +27,8 @@ plugins = ["grpc", "fieldpath"]
"google/protobuf/descriptor.proto" = "github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
"google/protobuf/field_mask.proto" = "github.com/gogo/protobuf/types"
"google/protobuf/timestamp.proto" = "github.com/gogo/protobuf/types"
"google/protobuf/duration.proto" = "github.com/gogo/protobuf/types"
"google/rpc/status.proto" = "github.com/containerd/containerd/protobuf/google/rpc"
# Aggregrate the API descriptors to lock down API changes.
[[descriptors]]