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// Copyright 2018 Google LLC.
//
// 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.
//
syntax = "proto3";
package google.api.expr.v1alpha1;
import "google/api/expr/v1alpha1/value.proto";
import "google/rpc/status.proto";
option cc_enable_arenas = true;
option go_package = "google.golang.org/genproto/googleapis/api/expr/v1alpha1;expr";
option java_multiple_files = true;
option java_outer_classname = "EvalProto";
option java_package = "com.google.api.expr.v1alpha1";
// The state of an evaluation.
//
// Can represent an inital, partial, or completed state of evaluation.
message EvalState {
// A single evalution result.
message Result {
// The id of the expression this result if for.
int64 expr = 1;
// The index in `values` of the resulting value.
int64 value = 2;
}
// The unique values referenced in this message.
repeated ExprValue values = 1;
// An ordered list of results.
//
// Tracks the flow of evaluation through the expression.
// May be sparse.
repeated Result results = 3;
}
// The value of an evaluated expression.
message ExprValue {
// An expression can resolve to a value, error or unknown.
oneof kind {
// A concrete value.
Value value = 1;
// The set of errors in the critical path of evalution.
//
// Only errors in the critical path are included. For example,
// `(<error1> || true) && <error2>` will only result in `<error2>`,
// while `<error1> || <error2>` will result in both `<error1>` and
// `<error2>`.
//
// Errors cause by the presence of other errors are not included in the
// set. For example `<error1>.foo`, `foo(<error1>)`, and `<error1> + 1` will
// only result in `<error1>`.
//
// Multiple errors *might* be included when evaluation could result
// in different errors. For example `<error1> + <error2>` and
// `foo(<error1>, <error2>)` may result in `<error1>`, `<error2>` or both.
// The exact subset of errors included for this case is unspecified and
// depends on the implementation details of the evaluator.
ErrorSet error = 2;
// The set of unknowns in the critical path of evaluation.
//
// Unknown behaves identically to Error with regards to propagation.
// Specifically, only unknowns in the critical path are included, unknowns
// caused by the presence of other unknowns are not included, and multiple
// unknowns *might* be included included when evaluation could result in
// different unknowns. For example:
//
// (<unknown[1]> || true) && <unknown[2]> -> <unknown[2]>
// <unknown[1]> || <unknown[2]> -> <unknown[1,2]>
// <unknown[1]>.foo -> <unknown[1]>
// foo(<unknown[1]>) -> <unknown[1]>
// <unknown[1]> + <unknown[2]> -> <unknown[1]> or <unknown[2[>
//
// Unknown takes precidence over Error in cases where a `Value` can short
// circuit the result:
//
// <error> || <unknown> -> <unknown>
// <error> && <unknown> -> <unknown>
//
// Errors take precidence in all other cases:
//
// <unknown> + <error> -> <error>
// foo(<unknown>, <error>) -> <error>
UnknownSet unknown = 3;
}
}
// A set of errors.
//
// The errors included depend on the context. See `ExprValue.error`.
message ErrorSet {
// The errors in the set.
repeated google.rpc.Status errors = 1;
}
// A set of expressions for which the value is unknown.
//
// The unknowns included depend on the context. See `ExprValue.unknown`.
message UnknownSet {
// The ids of the expressions with unknown values.
repeated int64 exprs = 1;
}
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