refactor(proto): move protobuf generated API to the top-level api/pb package

api/pb/common.proto

@@ -0,0 +1,72 @@
+syntax = "proto3";
+
+package api;
+
+option go_package = "github.com/psviderski/uncloud/api/pb";
+
+// Vendored at api/pb/vendor/google/rpc/status.proto.
+import "google/rpc/status.proto";
+import "google/protobuf/timestamp.proto";
+
+// Common metadata message nested in all reply message types, injected by the gRPC proxy to provide information
+// about the machine that responded to the request.
+message Metadata {
+  // ID of the machine the response came from.
+  string machine_id = 4;
+  // Name of the machine the response came from.
+  string machine_name = 5;
+  // Address of the machine the response came from.
+  string machine_addr = 1;
+
+  // error is set if the request to upstream failed. The rest of the response is undefined.
+  string error = 2;
+  // error as a gRPC Status message.
+  google.rpc.Status status = 3;
+}
+
+// A helper message for marshalling the metadata field and injecting it into the response by the gRPC proxy.
+message Empty {
+  Metadata metadata = 1;
+}
+
+// EmptyResponse is a response message to be returned by the gRPC proxy when a request to the upstream failed.
+// The nested Empty.Metadata message should contain an error.
+message EmptyResponse {
+  repeated Empty messages = 1;
+}
+
+message IP {
+  bytes ip = 1;
+}
+
+message IPPort {
+  IP ip = 1;
+  uint32 port = 2;
+}
+
+message IPPrefix {
+  IP ip = 1;
+  uint32 bits = 2;
+}
+
+message LogsRequest {
+  string id = 1;
+  // Options for logs retrieval.
+  bool follow = 2;
+  int32 tail = 3; // -1 means all
+  string since = 4; // https://www.rfc-editor.org/rfc/rfc3339.html timestamp or Go duration string
+  string until = 5; // https://www.rfc-editor.org/rfc/rfc3339.html timestamp or Go duration string
+}
+
+message LogEntry {
+  enum StreamType {
+    UNKNOWN = 0;
+    STDOUT = 1;
+    STDERR = 2;
+    HEARTBEAT = 3;
+  }
+  StreamType stream = 1;
+  google.protobuf.Timestamp timestamp = 2;
+  // Log line content. Empty for heartbeat entries.
+  bytes message = 3;
+}