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// Copyright 2016 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file contains the protocol used to communicate between the Bazel client
// and the server. At a high level clients may call the CommandServer.run rpc
// to initiates a Bazel command and CommandServer.cancel to cancel an in-flight
// command. CommandServer.ping may be used to check for server liveness without
// executing any commands. See documentation of individual messages for more
// details.
syntax = "proto3";
package command_server;
import "google/protobuf/any.proto";
import "src/main/protobuf/failure_details.proto";
option java_package = "com.google.devtools.build.lib.server";
option java_outer_classname = "CommandProtos";
// Passed to CommandServer.run to initiate execution of a Bazel command.
message RunRequest {
// Request cookie from the output base of the server. This serves as a
// rudimentary form of mutual authentication.
string cookie = 1;
// Command and command arguments. Does not include startup arguments.
repeated bytes arg = 2;
// Tells the server whether or not the client is willing to wait for any
// concurrent in-flight request to complete (there are many commands which
// may not run concurrently). If false and there are in-flight requests then
// the server will return an error immediately.
bool block_for_lock = 3;
// A simple description of the client for reporting purposes. This value is
// required.
string client_description = 4;
// Invocation policy affects how command arguments are interpreted and should
// be passed separately. This is a proto message, either a human readable
// String or base64-encoded binary-serialized version of the message. It is
// not typed directly as an InvocationPolicy message due to distinctions
// between batch and server mode, so the parsing logic is only in the Java
// code.
string invocation_policy = 5;
// Startup arguments, in the order they were applied, tagged with where they
// came from. These options have already been parsed and already have had
// their effect. This information should only be used for logging.
repeated StartupOption startup_options = 6;
// Whether the resulting command can be preempted if additional commands
// are received.
bool preemptible = 7;
// Additional per-command information passed to the server in the form of
// arbitrary messages which the server may be programmed to recognize and
// consume. Unrecognized message types are ignored.
repeated google.protobuf.Any command_extensions = 8;
}
// Contains the a startup option with its source file. Uses bytes to preserve
// the way the user inputted the arguments, like the args in RunRequest.
message StartupOption {
// Startup option in --nullaryflag or --unaryflag=value form.
bytes option = 1;
// Where the option came from, such as an rc file or an empty string for the
// command line.
bytes source = 2;
}
// Description of an environment variable
message EnvironmentVariable {
bytes name = 1;
bytes value = 2;
}
// Description of a request by the server to the client to execute a binary
// after the command invocation finishes.
message ExecRequest {
bytes working_directory = 1;
repeated bytes argv = 2;
repeated EnvironmentVariable environment_variable = 3;
repeated bytes environment_variable_to_clear = 4;
bool should_exec = 5;
}
// Contains metadata and result data for a command execution.
message RunResponse {
// Request cookie from the output base of the server. This serves as a
// rudimentary form of mutual authentication. Set on every response.
string cookie = 1;
// Standard out of the command, chunked. May be empty.
bytes standard_output = 2;
// Standard error of the command, chunked. May be empty.
bytes standard_error = 3;
// Whether this is the last message of the stream, signals that exit_code is
// valid.
bool finished = 4;
// The exit code of the command, only valid when finished is set.
int32 exit_code = 5;
// Randomly generated command identifier, this may be used to cancel execution
// of the command by issuing a cancel call. This should be sent to the client
// as soon as possible. This is not required to be set (non-empty) on every
// response.
string command_id = 6;
// Whether the command has shut down the server; if set, the client should
// wait until the server process dies before finishing.
bool termination_expected = 7;
// A command to exec() after the command invocation finishes. Should only be
// present if finished is set.
ExecRequest exec_request = 8;
// Fine-grained failure details. Should only be present if finished is set.
// WARNING: This functionality is experimental and should not be relied on at
// this time.
// TODO(mschaller): remove experimental warning
failure_details.FailureDetail failure_detail = 9;
// Additional per-command information passed by the server in the form of
// arbitrary messages.
repeated google.protobuf.Any command_extensions = 10;
}
// Passed to CommandServer.cancel to initiate graceful cancellation of an
// in-flight command.
message CancelRequest {
// The client request cookie (see RunRequest.cookie).
string cookie = 1;
// The id of the command to cancel.
string command_id = 2;
}
message CancelResponse {
// The server response cookie (see RunResponse.cookie).
string cookie = 1;
}
// Passed to CommandServer.ping to initiate a ping request.
message PingRequest {
// The client request cookie (see RunRequest.cookie).
string cookie = 1;
}
message PingResponse {
// The server response cookie (see RunResponse.cookie).
string cookie = 1;
}
// Describes metadata necessary for connecting to and managing the server.
message ServerInfo {
// The server process's pid.
int32 pid = 1;
// Address the CommandServer is listening on. Can be passed directly to grpc
// to create a connection.
string address = 2;
// Client request cookie.
string request_cookie = 3;
// Server response cookie.
string response_cookie = 4;
}
service CommandServer {
// Run a Bazel command. See documentation of argument/return messages for
// details.
rpc Run(RunRequest) returns (stream RunResponse) {}
// Cancel a currently running Bazel command. May return before the run command
// actually terminates.
rpc Cancel(CancelRequest) returns (CancelResponse) {}
// Does not do anything. Used for liveness check.
rpc Ping(PingRequest) returns (PingResponse) {}
}