diff options
Diffstat (limited to 'vendor/github.com/miekg/dns/client.go')
| -rw-r--r-- | vendor/github.com/miekg/dns/client.go | 44 |
1 files changed, 15 insertions, 29 deletions
diff --git a/vendor/github.com/miekg/dns/client.go b/vendor/github.com/miekg/dns/client.go index 9051ae007..2cdd49af1 100644 --- a/vendor/github.com/miekg/dns/client.go +++ b/vendor/github.com/miekg/dns/client.go @@ -6,7 +6,6 @@ import ( "context" "crypto/tls" "encoding/binary" - "fmt" "io" "net" "strings" @@ -56,14 +55,20 @@ type Client struct { // Timeout is a cumulative timeout for dial, write and read, defaults to 0 (disabled) - overrides DialTimeout, ReadTimeout, // WriteTimeout when non-zero. Can be overridden with net.Dialer.Timeout (see Client.ExchangeWithDialer and // Client.Dialer) or context.Context.Deadline (see ExchangeContext) - Timeout time.Duration - DialTimeout time.Duration // net.DialTimeout, defaults to 2 seconds, or net.Dialer.Timeout if expiring earlier - overridden by Timeout when that value is non-zero - ReadTimeout time.Duration // net.Conn.SetReadTimeout value for connections, defaults to 2 seconds - overridden by Timeout when that value is non-zero - WriteTimeout time.Duration // net.Conn.SetWriteTimeout value for connections, defaults to 2 seconds - overridden by Timeout when that value is non-zero - TsigSecret map[string]string // secret(s) for Tsig map[<zonename>]<base64 secret>, zonename must be in canonical form (lowercase, fqdn, see RFC 4034 Section 6.2) - TsigProvider TsigProvider // An implementation of the TsigProvider interface. If defined it replaces TsigSecret and is used for all TSIG operations. - SingleInflight bool // if true suppress multiple outstanding queries for the same Qname, Qtype and Qclass - group singleflight + Timeout time.Duration + DialTimeout time.Duration // net.DialTimeout, defaults to 2 seconds, or net.Dialer.Timeout if expiring earlier - overridden by Timeout when that value is non-zero + ReadTimeout time.Duration // net.Conn.SetReadTimeout value for connections, defaults to 2 seconds - overridden by Timeout when that value is non-zero + WriteTimeout time.Duration // net.Conn.SetWriteTimeout value for connections, defaults to 2 seconds - overridden by Timeout when that value is non-zero + TsigSecret map[string]string // secret(s) for Tsig map[<zonename>]<base64 secret>, zonename must be in canonical form (lowercase, fqdn, see RFC 4034 Section 6.2) + TsigProvider TsigProvider // An implementation of the TsigProvider interface. If defined it replaces TsigSecret and is used for all TSIG operations. + + // SingleInflight previously serialised multiple concurrent queries for the + // same Qname, Qtype and Qclass to ensure only one would be in flight at a + // time. + // + // Deprecated: This is a no-op. Callers should implement their own in flight + // query caching if needed. See github.com/miekg/dns/issues/1449. + SingleInflight bool } // Exchange performs a synchronous UDP query. It sends the message m to the address @@ -185,26 +190,7 @@ func (c *Client) ExchangeWithConn(m *Msg, conn *Conn) (r *Msg, rtt time.Duration return c.exchangeWithConnContext(context.Background(), m, conn) } -func (c *Client) exchangeWithConnContext(ctx context.Context, m *Msg, conn *Conn) (r *Msg, rtt time.Duration, err error) { - if !c.SingleInflight { - return c.exchangeContext(ctx, m, conn) - } - - q := m.Question[0] - key := fmt.Sprintf("%s:%d:%d", q.Name, q.Qtype, q.Qclass) - r, rtt, err, shared := c.group.Do(key, func() (*Msg, time.Duration, error) { - // When we're doing singleflight we don't want one context cancellation, cancel _all_ outstanding queries. - // Hence we ignore the context and use Background(). - return c.exchangeContext(context.Background(), m, conn) - }) - if r != nil && shared { - r = r.Copy() - } - - return r, rtt, err -} - -func (c *Client) exchangeContext(ctx context.Context, m *Msg, co *Conn) (r *Msg, rtt time.Duration, err error) { +func (c *Client) exchangeWithConnContext(ctx context.Context, m *Msg, co *Conn) (r *Msg, rtt time.Duration, err error) { opt := m.IsEdns0() // If EDNS0 is used use that for size. if opt != nil && opt.UDPSize() >= MinMsgSize { |