diff options
Diffstat (limited to 'vendor/google.golang.org/grpc/internal/resolver')
| -rw-r--r-- | vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go | 40 | ||||
| -rw-r--r-- | vendor/google.golang.org/grpc/internal/resolver/dns/internal/internal.go | 19 |
2 files changed, 37 insertions, 22 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 { diff --git a/vendor/google.golang.org/grpc/internal/resolver/dns/internal/internal.go b/vendor/google.golang.org/grpc/internal/resolver/dns/internal/internal.go index c7fc557d0..c0eae4f5f 100644 --- a/vendor/google.golang.org/grpc/internal/resolver/dns/internal/internal.go +++ b/vendor/google.golang.org/grpc/internal/resolver/dns/internal/internal.go @@ -28,7 +28,7 @@ import ( // NetResolver groups the methods on net.Resolver that are used by the DNS // resolver implementation. This allows the default net.Resolver instance to be -// overidden from tests. +// overridden from tests. type NetResolver interface { LookupHost(ctx context.Context, host string) (addrs []string, err error) LookupSRV(ctx context.Context, service, proto, name string) (cname string, addrs []*net.SRV, err error) @@ -50,16 +50,23 @@ var ( // The following vars are overridden from tests. var ( - // MinResolutionRate is the minimum rate at which re-resolutions are - // allowed. This helps to prevent excessive re-resolution. - MinResolutionRate = 30 * time.Second - // TimeAfterFunc is used by the DNS resolver to wait for the given duration - // to elapse. In non-test code, this is implemented by time.After. In test + // to elapse. In non-test code, this is implemented by time.After. In test // code, this can be used to control the amount of time the resolver is // blocked waiting for the duration to elapse. TimeAfterFunc func(time.Duration) <-chan time.Time + // TimeNowFunc is used by the DNS resolver to get the current time. + // In non-test code, this is implemented by time.Now. In test code, + // this can be used to control the current time for the resolver. + TimeNowFunc func() time.Time + + // TimeUntilFunc is used by the DNS resolver to calculate the remaining + // wait time for re-resolution. In non-test code, this is implemented by + // time.Until. In test code, this can be used to control the remaining + // time for resolver to wait for re-resolution. + TimeUntilFunc func(time.Time) time.Duration + // NewNetResolver returns the net.Resolver instance for the given target. NewNetResolver func(string) (NetResolver, error) |