115 lines
3.2 KiB
Go
115 lines
3.2 KiB
Go
/*
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* Copyright 2020 The Dragonfly 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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*/
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//go:generate mockgen -destination mocks/client_mock.go -source client.go -package mocks
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package client
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import (
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"context"
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"fmt"
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"time"
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grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
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grpc_zap "github.com/grpc-ecosystem/go-grpc-middleware/logging/zap"
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grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
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"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
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"google.golang.org/grpc"
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healthpb "google.golang.org/grpc/health/grpc_health_v1"
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logger "d7y.io/dragonfly/v2/internal/dflog"
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)
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const (
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// contextTimeout is timeout of grpc invoke.
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contextTimeout = 2 * time.Second
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)
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// GetClient returns health client.
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func GetClient(ctx context.Context, target string, opts ...grpc.DialOption) (Client, error) {
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conn, err := grpc.DialContext(
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ctx,
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target,
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append([]grpc.DialOption{
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grpc.WithUnaryInterceptor(grpc_middleware.ChainUnaryClient(
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otelgrpc.UnaryClientInterceptor(),
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grpc_prometheus.UnaryClientInterceptor,
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grpc_zap.UnaryClientInterceptor(logger.GrpcLogger.Desugar()),
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)),
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grpc.WithStreamInterceptor(grpc_middleware.ChainStreamClient(
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otelgrpc.StreamClientInterceptor(),
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grpc_prometheus.StreamClientInterceptor,
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grpc_zap.StreamClientInterceptor(logger.GrpcLogger.Desugar()),
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)),
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}, opts...)...,
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)
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if err != nil {
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return nil, err
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}
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return &client{
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HealthClient: healthpb.NewHealthClient(conn),
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ClientConn: conn,
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}, nil
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}
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// Check checks health of grpc server.
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func Check(ctx context.Context, target string, opts ...grpc.DialOption) error {
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healthClient, err := GetClient(ctx, target, opts...)
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if err != nil {
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return err
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}
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defer healthClient.Close()
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if err := healthClient.Check(context.Background(), &healthpb.HealthCheckRequest{}); err != nil {
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return err
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}
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return nil
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}
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// Client is the interface for grpc client.
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type Client interface {
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// Check checks health of grpc server.
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Check(context.Context, *healthpb.HealthCheckRequest, ...grpc.CallOption) error
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// Close tears down the ClientConn and all underlying connections.
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Close() error
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}
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// client provides health grpc function.
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type client struct {
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healthpb.HealthClient
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*grpc.ClientConn
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}
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// Check checks health of grpc server.
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func (c *client) Check(ctx context.Context, req *healthpb.HealthCheckRequest, opts ...grpc.CallOption) error {
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ctx, cancel := context.WithTimeout(ctx, contextTimeout)
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defer cancel()
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resp, err := c.HealthClient.Check(ctx, req, opts...)
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if err != nil {
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return err
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}
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if resp.Status != healthpb.HealthCheckResponse_SERVING {
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return fmt.Errorf("check %s health failed, because of status is %d", c.ClientConn.Target(), resp.Status)
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}
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return nil
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}
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