frostfs-sdk-go/pool/tree/client.go

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package tree
import (
"context"
"fmt"
"sync"
grpcService "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool/tree/service"
"google.golang.org/grpc"
)
type treeClient struct {
mu sync.RWMutex
address string
opts []grpc.DialOption
conn *grpc.ClientConn
service grpcService.TreeServiceClient
healthy bool
}
// newTreeClient creates new tree client with auto dial.
func newTreeClient(addr string, opts ...grpc.DialOption) *treeClient {
return &treeClient{
address: addr,
opts: opts,
}
}
func (c *treeClient) dial(ctx context.Context) error {
c.mu.Lock()
defer c.mu.Unlock()
if c.conn != nil {
return fmt.Errorf("couldn't dial '%s': connection already established", c.address)
}
var err error
c.conn, err = grpc.DialContext(ctx, c.address, c.opts...)
if err != nil {
return fmt.Errorf("grpc dial node tree service: %w", err)
}
c.service = grpcService.NewTreeServiceClient(c.conn)
if _, err = c.service.Healthcheck(ctx, &grpcService.HealthcheckRequest{}); err != nil {
return fmt.Errorf("healthcheck tree service: %w", err)
}
c.healthy = true
return nil
}
func (c *treeClient) redialIfNecessary(ctx context.Context) (healthHasChanged bool, err error) {
c.mu.Lock()
defer c.mu.Unlock()
if c.conn == nil {
c.conn, err = grpc.DialContext(ctx, c.address, c.opts...)
if err != nil {
return false, fmt.Errorf("grpc dial node tree service: %w", err)
}
c.service = grpcService.NewTreeServiceClient(c.conn)
}
wasHealthy := c.healthy
if _, err = c.service.Healthcheck(ctx, &grpcService.HealthcheckRequest{}); err != nil {
c.healthy = false
return wasHealthy, fmt.Errorf("healthcheck tree service: %w", err)
}
c.healthy = true
return !wasHealthy, nil
}
func (c *treeClient) serviceClient() (grpcService.TreeServiceClient, error) {
c.mu.RLock()
defer c.mu.RUnlock()
if c.conn == nil || !c.healthy {
return nil, fmt.Errorf("unhealthy endpoint: '%s'", c.address)
}
return c.service, nil
}
func (c *treeClient) endpoint() string {
return c.address
}
func (c *treeClient) isHealthy() bool {
c.mu.RLock()
defer c.mu.RUnlock()
return c.healthy
}
func (c *treeClient) setHealthy(val bool) {
c.mu.Lock()
defer c.mu.Unlock()
c.healthy = val
}
func (c *treeClient) close() error {
c.mu.Lock()
defer c.mu.Unlock()
if c.conn == nil {
return nil
}
return c.conn.Close()
}