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|
package gitaly
import (
"context"
"fmt"
"sync"
grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
"google.golang.org/grpc"
gitalyauth "gitlab.com/gitlab-org/gitaly/v16/auth"
"gitlab.com/gitlab-org/gitaly/v16/client"
gitalyclient "gitlab.com/gitlab-org/gitaly/v16/client"
"gitlab.com/gitlab-org/labkit/correlation"
grpccorrelation "gitlab.com/gitlab-org/labkit/correlation/grpc"
"gitlab.com/gitlab-org/labkit/log"
grpctracing "gitlab.com/gitlab-org/labkit/tracing/grpc"
"gitlab.com/gitlab-org/gitlab-shell/v14/internal/metrics"
)
type Command struct {
ServiceName string
Address string
Token string
}
type connectionsCache struct {
sync.RWMutex
connections map[Command]*grpc.ClientConn
}
type Client struct {
SidechannelRegistry *gitalyclient.SidechannelRegistry
cache connectionsCache
}
func (c *Client) InitSidechannelRegistry(ctx context.Context) {
c.SidechannelRegistry = gitalyclient.NewSidechannelRegistry(log.ContextLogger(ctx))
}
func (c *Client) GetConnection(ctx context.Context, cmd Command) (*grpc.ClientConn, error) {
c.cache.RLock()
conn := c.cache.connections[cmd]
c.cache.RUnlock()
if conn != nil {
return conn, nil
}
c.cache.Lock()
defer c.cache.Unlock()
if conn := c.cache.connections[cmd]; conn != nil {
return conn, nil
}
conn, err := c.newConnection(ctx, cmd)
if err != nil {
return nil, err
}
if c.cache.connections == nil {
c.cache.connections = make(map[Command]*grpc.ClientConn)
}
c.cache.connections[cmd] = conn
return conn, nil
}
func (c *Client) newConnection(ctx context.Context, cmd Command) (conn *grpc.ClientConn, err error) {
defer func() {
label := "ok"
if err != nil {
label = "fail"
}
metrics.GitalyConnectionsTotal.WithLabelValues(label).Inc()
}()
if cmd.Address == "" {
return nil, fmt.Errorf("no gitaly_address given")
}
serviceName := correlation.ExtractClientNameFromContext(ctx)
if serviceName == "" {
serviceName = "gitlab-shell-unknown"
log.WithContextFields(ctx, log.Fields{"service_name": serviceName}).Warn("No gRPC service name specified, defaulting to gitlab-shell-unknown")
}
serviceName = fmt.Sprintf("%s-%s", serviceName, cmd.ServiceName)
connOpts := client.DefaultDialOpts
connOpts = append(
connOpts,
grpc.WithChainStreamInterceptor(
grpctracing.StreamClientTracingInterceptor(),
grpc_prometheus.StreamClientInterceptor,
grpccorrelation.StreamClientCorrelationInterceptor(
grpccorrelation.WithClientName(serviceName),
),
),
grpc.WithChainUnaryInterceptor(
grpctracing.UnaryClientTracingInterceptor(),
grpc_prometheus.UnaryClientInterceptor,
grpccorrelation.UnaryClientCorrelationInterceptor(
grpccorrelation.WithClientName(serviceName),
),
),
// In https://gitlab.com/groups/gitlab-org/-/epics/8971, we added DNS discovery support to Praefect. This was
// done by making two changes:
// - Configure client-side round-robin load-balancing in client dial options. We added that as a default option
// inside gitaly client in gitaly client since v15.9.0
// - Configure DNS resolving. Due to some technical limitations, we don't use gRPC's built-in DNS resolver.
// Instead, we implement our own DNS resolver. This resolver is exposed via the following configuration.
// Afterward, workhorse can detect and handle DNS discovery automatically. The user needs to setup and set
// Gitaly address to something like "dns:gitaly.service.dc1.consul"
gitalyclient.WithGitalyDNSResolver(gitalyclient.DefaultDNSResolverBuilderConfig()),
)
if cmd.Token != "" {
connOpts = append(connOpts,
grpc.WithPerRPCCredentials(gitalyauth.RPCCredentialsV2(cmd.Token)),
)
}
return client.DialSidechannel(ctx, cmd.Address, c.SidechannelRegistry, connOpts)
}
|
