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client_health.go
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client_health.go
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package grid
import (
"context"
"errors"
"fmt"
"io"
"time"
"github.com/lytics/retry"
healthpb "google.golang.org/grpc/health/grpc_health_v1"
)
func (c *Client) Check(ctx context.Context, peer string) (*healthpb.HealthCheckResponse, error) {
nsReceiver, err := namespaceName(Peers, c.cfg.Namespace, peer)
if err != nil {
return nil, fmt.Errorf("namespacing name: %w", err)
}
var resp *healthpb.HealthCheckResponse
_ = retry.XWithContext(ctx, 3, time.Second, func(ctx context.Context) error {
var client healthpb.HealthClient
client, _, err = c.getHealthClient(ctx, nsReceiver)
if err != nil {
return nil
}
resp, err = client.Check(ctx, &healthpb.HealthCheckRequest{})
if err != nil {
return err
}
return nil
})
if err != nil {
return nil, fmt.Errorf("checking health: %w", err)
}
return resp, nil
}
func (c *Client) Watch(ctx context.Context, peer string) (healthpb.Health_WatchClient, error) {
nsReceiver, err := namespaceName(Peers, c.cfg.Namespace, peer)
if err != nil {
return nil, fmt.Errorf("namespacing name: %w", err)
}
var recv healthpb.Health_WatchClient
_ = retry.XWithContext(ctx, 3, time.Second, func(ctx context.Context) error {
var client healthpb.HealthClient
client, _, err = c.getHealthClient(ctx, nsReceiver)
if err != nil {
return nil
}
recv, err = client.Watch(ctx, &healthpb.HealthCheckRequest{})
if err != nil {
return err
}
return nil
})
if err != nil {
return nil, fmt.Errorf("checking health: %w", err)
}
return recv, nil
}
// WaitUntilServing blocks until the peer is serving or the context is done.
// Will retry with exponential backoff.
func (c *Client) WaitUntilServing(ctx context.Context, peer string) error {
b := newBackoff()
defer b.Stop()
LOOP:
for {
if err := b.Backoff(ctx); err != nil {
return fmt.Errorf("backing off: %w", err)
}
stream, err := c.Watch(ctx, peer)
if err != nil {
c.logf("watching peer: %v", err)
continue
}
resp := new(healthpb.HealthCheckResponse)
for resp.Status != healthpb.HealthCheckResponse_SERVING {
resp, err = stream.Recv()
if errors.Is(err, io.EOF) {
c.logf("stream ended, restarting")
continue LOOP
}
if err != nil {
return fmt.Errorf("receiving: %w", err)
}
}
return nil
}
}
func (c *Client) getHealthClient(ctx context.Context, nsReceiver string) (healthpb.HealthClient, int64, error) {
c.mu.Lock()
defer c.mu.Unlock()
cc, id, err := c.getCCLocked(ctx, nsReceiver)
if err != nil {
return nil, id, err
}
return cc.health, id, nil
}