chore: Update go connector to wrap nested errors during dial. (#1015)

Author: hessjcg

dialer.go

@@ -235,15 +235,15 @@ func NewDialer(ctx context.Context, opts ...Option) (*Dialer, error) {
 			Scopes: []string{sqladmin.SqlserviceAdminScope},
 		})
 		if err != nil {
-			return nil, fmt.Errorf("failed to create default credentials: %v", err)
+			return nil, fmt.Errorf("failed to create default credentials: %w", err)
 		}
 		cfg.authCredentials = c
 		// create second set of credentials, scoped for IAM AuthN login only
 		scoped, err := credentials.DetectDefault(&credentials.DetectOptions{
 			Scopes: []string{iamLoginScope},
 		})
 		if err != nil {
-			return nil, fmt.Errorf("failed to create scoped credentials: %v", err)
+			return nil, fmt.Errorf("failed to create scoped credentials: %w", err)
 		}
 		cfg.iamLoginTokenProvider = scoped.TokenProvider
 	}
@@ -265,7 +265,7 @@ func NewDialer(ctx context.Context, opts ...Option) (*Dialer, error) {
 			UniverseDomain: cfg.getClientUniverseDomain(),
 		})
 		if err != nil {
-			return nil, fmt.Errorf("failed to create auth client: %v", err)
+			return nil, fmt.Errorf("failed to create auth client: %w", err)
 		}
 		// If callers have not provided an HTTPClient explicitly with
 		// WithHTTPClient, then use auth client
@@ -282,7 +282,7 @@ func NewDialer(ctx context.Context, opts ...Option) (*Dialer, error) {
 
 	client, err := sqladmin.NewService(ctx, cfg.sqladminOpts...)
 	if err != nil {
-		return nil, fmt.Errorf("failed to create sqladmin client: %v", err)
+		return nil, fmt.Errorf("failed to create sqladmin client: %w", err)
 	}
 
 	dc := dialConfig{

internal/cloudsql/resolver.go

@@ -103,7 +103,7 @@ func (r *DNSInstanceConnectionNameResolver) queryDNS(ctx context.Context, domain
 	records, err := r.dnsResolver.LookupTXT(ctx, domainName)
 	// If resolve failed and no records were found, return the error.
 	if err != nil {
-		return instance.ConnName{}, fmt.Errorf("unable to resolve TXT record for %q: %v", domainName, err)
+		return instance.ConnName{}, fmt.Errorf("unable to resolve TXT record for %q: %w", domainName, err)
 	}
 
 	// Process the records returning the first valid TXT record.
@@ -119,7 +119,7 @@ func (r *DNSInstanceConnectionNameResolver) queryDNS(ctx context.Context, domain
 		// Parse the target as a CN
 		cn, parseErr := instance.ParseConnNameWithDomainName(record, domainName)
 		if parseErr != nil {
-			perr = fmt.Errorf("unable to parse TXT for %q -> %q : %v", domainName, record, parseErr)
+			perr = fmt.Errorf("unable to parse TXT for %q -> %q : %w", domainName, record, parseErr)
 			continue
 		}
 		return cn, nil

internal/trace/metrics.go

@@ -137,7 +137,7 @@ func InitMetrics() error {
 			bytesSentView,
 			bytesReceivedView,
 		); rErr != nil {
-			registerErr = fmt.Errorf("failed to initialize metrics: %v", rErr)
+			registerErr = fmt.Errorf("failed to initialize metrics: %w", rErr)
 		}
 	})
 	return registerErr