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127 lines
3.3 KiB
127 lines
3.3 KiB
package util
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import (
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"context"
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"fmt"
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"net/http"
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"strconv"
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"strings"
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"sync"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/keepalive"
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)
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var (
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// cache grpc connections
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grpcClients = make(map[string]*grpc.ClientConn)
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grpcClientsLock sync.Mutex
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)
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func init() {
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http.DefaultTransport.(*http.Transport).MaxIdleConnsPerHost = 1024
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}
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func NewGrpcServer(opts ...grpc.ServerOption) *grpc.Server {
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var options []grpc.ServerOption
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options = append(options, grpc.KeepaliveParams(keepalive.ServerParameters{
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Time: 10 * time.Second, // wait time before ping if no activity
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Timeout: 20 * time.Second, // ping timeout
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}), grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
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MinTime: 60 * time.Second, // min time a client should wait before sending a ping
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}))
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for _, opt := range opts {
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if opt != nil {
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options = append(options, opt)
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}
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}
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return grpc.NewServer(options...)
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}
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func GrpcDial(ctx context.Context, address string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
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// opts = append(opts, grpc.WithBlock())
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// opts = append(opts, grpc.WithTimeout(time.Duration(5*time.Second)))
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var options []grpc.DialOption
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options = append(options,
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// grpc.WithInsecure(),
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grpc.WithKeepaliveParams(keepalive.ClientParameters{
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Time: 30 * time.Second, // client ping server if no activity for this long
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Timeout: 20 * time.Second,
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}))
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for _, opt := range opts {
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if opt != nil {
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options = append(options, opt)
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}
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}
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return grpc.DialContext(ctx, address, options...)
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}
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func WithCachedGrpcClient(ctx context.Context, fn func(*grpc.ClientConn) error, address string, opts ...grpc.DialOption) error {
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grpcClientsLock.Lock()
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existingConnection, found := grpcClients[address]
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if found {
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grpcClientsLock.Unlock()
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err := fn(existingConnection)
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if err != nil {
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grpcClientsLock.Lock()
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delete(grpcClients, address)
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grpcClientsLock.Unlock()
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existingConnection.Close()
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}
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return err
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}
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grpcConnection, err := GrpcDial(ctx, address, opts...)
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if err != nil {
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grpcClientsLock.Unlock()
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return fmt.Errorf("fail to dial %s: %v", address, err)
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}
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grpcClients[address] = grpcConnection
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grpcClientsLock.Unlock()
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err = fn(grpcConnection)
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if err != nil {
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grpcClientsLock.Lock()
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delete(grpcClients, address)
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grpcClientsLock.Unlock()
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grpcConnection.Close()
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}
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return err
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}
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func ParseServerToGrpcAddress(server string) (serverGrpcAddress string, err error) {
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colonIndex := strings.LastIndex(server, ":")
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if colonIndex < 0 {
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return "", fmt.Errorf("server should have hostname:port format: %v", server)
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}
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port, parseErr := strconv.ParseUint(server[colonIndex+1:], 10, 64)
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if parseErr != nil {
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return "", fmt.Errorf("server port parse error: %v", parseErr)
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}
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grpcPort := int(port) + 10000
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return fmt.Sprintf("%s:%d", server[:colonIndex], grpcPort), nil
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}
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func ServerToGrpcAddress(server string) (serverGrpcAddress string) {
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hostnameAndPort := strings.Split(server, ":")
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if len(hostnameAndPort) != 2 {
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return fmt.Sprintf("unexpected server address: %s", server)
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}
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port, parseErr := strconv.ParseUint(hostnameAndPort[1], 10, 64)
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if parseErr != nil {
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return fmt.Sprintf("failed to parse port for %s:%s", hostnameAndPort[0], hostnameAndPort[1])
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}
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grpcPort := int(port) + 10000
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return fmt.Sprintf("%s:%d", hostnameAndPort[0], grpcPort)
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}
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