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grpcruntime.go
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grpcruntime.go
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// Copyright 2022 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.
package engine
import (
"context"
"fmt"
"io"
"io/ioutil"
v1 "github.com/GoogleContainerTools/kpt/pkg/api/kptfile/v1"
"github.com/GoogleContainerTools/kpt/pkg/fn"
"github.com/GoogleContainerTools/kpt/porch/engine/pkg/kpt"
"github.com/GoogleContainerTools/kpt/porch/func/evaluator"
"google.golang.org/grpc"
"k8s.io/klog/v2"
)
type grpcRuntime struct {
cc *grpc.ClientConn
client evaluator.FunctionEvaluatorClient
}
var _ kpt.FunctionRuntime = &grpcRuntime{}
func (gr *grpcRuntime) GetRunner(ctx context.Context, fn *v1.Function) (fn.FunctionRunner, error) {
return &grpcRunner{
ctx: ctx,
client: gr.client,
image: fn.Image,
}, nil
}
func (gr *grpcRuntime) Close() error {
var err error
if gr.cc != nil {
if err = gr.cc.Close(); err != nil {
klog.Warningf("Failed to close grpc client connection: %v", err)
}
gr.cc = nil
}
return err
}
type grpcRunner struct {
ctx context.Context
client evaluator.FunctionEvaluatorClient
image string
}
var _ fn.FunctionRunner = &grpcRunner{}
func (gr *grpcRunner) Run(r io.Reader, w io.Writer) error {
in, err := ioutil.ReadAll(r)
if err != nil {
return fmt.Errorf("failed to read function runner input: %w", err)
}
res, err := gr.client.EvaluateFunction(gr.ctx, &evaluator.EvaluateFunctionRequest{
ResourceList: in,
Image: gr.image,
})
if err != nil {
return fmt.Errorf("func eval failed: %w", err)
}
if _, err := w.Write(res.ResourceList); err != nil {
return fmt.Errorf("failed to write function runner output: %w", err)
}
return nil
}