140 lines
3.2 KiB
Go
140 lines
3.2 KiB
Go
package tree
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import (
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"context"
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"crypto/tls"
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"errors"
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"fmt"
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"sync"
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apiClient "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/api/rpc/client"
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grpcService "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool/tree/service"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials"
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"google.golang.org/grpc/credentials/insecure"
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)
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type treeClient struct {
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mu sync.RWMutex
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address string
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opts []grpc.DialOption
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conn *grpc.ClientConn
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service grpcService.TreeServiceClient
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healthy bool
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}
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// ErrUnhealthyEndpoint is returned when client in the pool considered unavailable.
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var ErrUnhealthyEndpoint = errors.New("unhealthy endpoint")
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// newTreeClient creates new tree client with auto dial.
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func newTreeClient(addr string, opts ...grpc.DialOption) *treeClient {
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return &treeClient{
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address: addr,
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opts: opts,
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}
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}
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func (c *treeClient) dial(ctx context.Context) error {
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c.mu.Lock()
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defer c.mu.Unlock()
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if c.conn != nil {
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return fmt.Errorf("couldn't dial '%s': connection already established", c.address)
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}
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var err error
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if c.conn, c.service, err = createClient(c.address, c.opts...); err != nil {
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return err
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}
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if _, err = c.service.Healthcheck(ctx, &grpcService.HealthcheckRequest{}); err != nil {
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return fmt.Errorf("healthcheck tree service: %w", err)
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}
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c.healthy = true
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return nil
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}
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func (c *treeClient) redialIfNecessary(ctx context.Context) (healthHasChanged bool, err error) {
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c.mu.Lock()
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defer c.mu.Unlock()
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if c.conn == nil {
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if c.conn, c.service, err = createClient(c.address, c.opts...); err != nil {
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return false, err
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}
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}
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wasHealthy := c.healthy
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if _, err = c.service.Healthcheck(ctx, &grpcService.HealthcheckRequest{}); err != nil {
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c.healthy = false
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return wasHealthy, fmt.Errorf("healthcheck tree service: %w", err)
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}
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c.healthy = true
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return !wasHealthy, nil
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}
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func createClient(addr string, clientOptions ...grpc.DialOption) (*grpc.ClientConn, grpcService.TreeServiceClient, error) {
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host, tlsEnable, err := apiClient.ParseURI(addr)
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if err != nil {
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return nil, nil, fmt.Errorf("parse address: %w", err)
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}
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creds := insecure.NewCredentials()
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if tlsEnable {
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creds = credentials.NewTLS(&tls.Config{})
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}
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options := []grpc.DialOption{grpc.WithTransportCredentials(creds)}
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// the order is matter, we want client to be able to overwrite options.
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opts := append(options, clientOptions...)
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conn, err := grpc.NewClient(host, opts...)
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if err != nil {
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return nil, nil, fmt.Errorf("grpc create node tree service: %w", err)
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}
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return conn, grpcService.NewTreeServiceClient(conn), nil
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}
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func (c *treeClient) serviceClient() (grpcService.TreeServiceClient, error) {
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c.mu.RLock()
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defer c.mu.RUnlock()
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if c.conn == nil || !c.healthy {
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return nil, fmt.Errorf("%w: '%s'", ErrUnhealthyEndpoint, c.address)
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}
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return c.service, nil
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}
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func (c *treeClient) endpoint() string {
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return c.address
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}
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func (c *treeClient) isHealthy() bool {
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c.mu.RLock()
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defer c.mu.RUnlock()
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return c.healthy
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}
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func (c *treeClient) setHealthy(val bool) {
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c.mu.Lock()
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defer c.mu.Unlock()
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c.healthy = val
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}
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func (c *treeClient) close() error {
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c.mu.Lock()
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defer c.mu.Unlock()
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if c.conn == nil {
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return nil
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}
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return c.conn.Close()
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}
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