diff options
Diffstat (limited to 'vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go')
| -rw-r--r-- | vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go | 40 |
1 files changed, 24 insertions, 16 deletions
diff --git a/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go b/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go index abab35e25..4552db16b 100644 --- a/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go +++ b/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go @@ -24,6 +24,7 @@ import ( "context" "encoding/json" "fmt" + "math/rand" "net" "os" "strconv" @@ -35,28 +36,35 @@ import ( "google.golang.org/grpc/grpclog" "google.golang.org/grpc/internal/backoff" "google.golang.org/grpc/internal/envconfig" - "google.golang.org/grpc/internal/grpcrand" "google.golang.org/grpc/internal/resolver/dns/internal" "google.golang.org/grpc/resolver" "google.golang.org/grpc/serviceconfig" ) -// EnableSRVLookups controls whether the DNS resolver attempts to fetch gRPCLB -// addresses from SRV records. Must not be changed after init time. -var EnableSRVLookups = false +var ( + // EnableSRVLookups controls whether the DNS resolver attempts to fetch gRPCLB + // addresses from SRV records. Must not be changed after init time. + EnableSRVLookups = false -// ResolvingTimeout specifies the maximum duration for a DNS resolution request. -// If the timeout expires before a response is received, the request will be canceled. -// -// It is recommended to set this value at application startup. Avoid modifying this variable -// after initialization as it's not thread-safe for concurrent modification. -var ResolvingTimeout = 30 * time.Second + // MinResolutionInterval is the minimum interval at which re-resolutions are + // allowed. This helps to prevent excessive re-resolution. + MinResolutionInterval = 30 * time.Second -var logger = grpclog.Component("dns") + // ResolvingTimeout specifies the maximum duration for a DNS resolution request. + // If the timeout expires before a response is received, the request will be canceled. + // + // It is recommended to set this value at application startup. Avoid modifying this variable + // after initialization as it's not thread-safe for concurrent modification. + ResolvingTimeout = 30 * time.Second + + logger = grpclog.Component("dns") +) func init() { resolver.Register(NewBuilder()) internal.TimeAfterFunc = time.After + internal.TimeNowFunc = time.Now + internal.TimeUntilFunc = time.Until internal.NewNetResolver = newNetResolver internal.AddressDialer = addressDialer } @@ -203,12 +211,12 @@ func (d *dnsResolver) watcher() { err = d.cc.UpdateState(*state) } - var waitTime time.Duration + var nextResolutionTime time.Time if err == nil { // Success resolving, wait for the next ResolveNow. However, also wait 30 // seconds at the very least to prevent constantly re-resolving. backoffIndex = 1 - waitTime = internal.MinResolutionRate + nextResolutionTime = internal.TimeNowFunc().Add(MinResolutionInterval) select { case <-d.ctx.Done(): return @@ -217,13 +225,13 @@ func (d *dnsResolver) watcher() { } else { // Poll on an error found in DNS Resolver or an error received from // ClientConn. - waitTime = backoff.DefaultExponential.Backoff(backoffIndex) + nextResolutionTime = internal.TimeNowFunc().Add(backoff.DefaultExponential.Backoff(backoffIndex)) backoffIndex++ } select { case <-d.ctx.Done(): return - case <-internal.TimeAfterFunc(waitTime): + case <-internal.TimeAfterFunc(internal.TimeUntilFunc(nextResolutionTime)): } } } @@ -417,7 +425,7 @@ func chosenByPercentage(a *int) bool { if a == nil { return true } - return grpcrand.Intn(100)+1 <= *a + return rand.Intn(100)+1 <= *a } func canaryingSC(js string) string { |