istio

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// Copyright Istio Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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//     http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package grpcready
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import (
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	"fmt"
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	"sync"
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	"istio.io/istio/pilot/cmd/pilot-agent/status/ready"
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	"istio.io/istio/pkg/file"
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	"istio.io/istio/pkg/istio-agent/grpcxds"
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)
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var _ ready.Prober = &probe{}
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type probe struct {
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	sync.RWMutex
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	bootstrapPath string
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	bootstrap     *grpcxds.Bootstrap
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}
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// NewProbe returns a probe that checks if a valid bootstrap file can be loaded once.
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// If that bootstrap file has a file_watcher cert provider, we also ensure those certs exist.
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func NewProbe(bootstrapPath string) ready.Prober {
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	return &probe{bootstrapPath: bootstrapPath}
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}
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func (p *probe) Check() error {
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	// TODO file watch?
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	if p.getBootstrap() == nil {
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		bootstrap, err := grpcxds.LoadBootstrap(p.bootstrapPath)
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		if err != nil {
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			return fmt.Errorf("failed loading %s: %v", p.bootstrapPath, err)
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		}
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		p.setBootstrap(bootstrap)
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	}
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	if bootstrap := p.getBootstrap(); bootstrap != nil {
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		if fwp := bootstrap.FileWatcherProvider(); fwp != nil {
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			for _, path := range fwp.FilePaths() {
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				if !file.Exists(path) {
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					return fmt.Errorf("%s does not exist", path)
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				}
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			}
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		}
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	}
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	return nil
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}
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func (p *probe) getBootstrap() *grpcxds.Bootstrap {
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	p.RLock()
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	defer p.RUnlock()
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	return p.bootstrap
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}
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func (p *probe) setBootstrap(bootstrap *grpcxds.Bootstrap) {
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	p.Lock()
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	defer p.Unlock()
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	p.bootstrap = bootstrap
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}
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