73 lines
1.6 KiB
Go
73 lines
1.6 KiB
Go
package zipkintracer
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import (
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"encoding/binary"
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"net"
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"strconv"
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"strings"
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"github.com/openzipkin/zipkin-go-opentracing/thrift/gen-go/zipkincore"
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)
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// makeEndpoint takes the hostport and service name that represent this Zipkin
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// service, and returns an endpoint that's embedded into the Zipkin core Span
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// type. It will return a nil endpoint if the input parameters are malformed.
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func makeEndpoint(hostport, serviceName string) (ep *zipkincore.Endpoint) {
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ep = zipkincore.NewEndpoint()
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// Set the ServiceName
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ep.ServiceName = serviceName
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if strings.IndexByte(hostport, ':') < 0 {
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// "<host>" becomes "<host>:0"
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hostport = hostport + ":0"
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}
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// try to parse provided "<host>:<port>"
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host, port, err := net.SplitHostPort(hostport)
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if err != nil {
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// if unparsable, return as "undefined:0"
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return
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}
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// try to set port number
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p, _ := strconv.ParseUint(port, 10, 16)
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ep.Port = int16(p)
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// if <host> is a domain name, look it up
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addrs, err := net.LookupIP(host)
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if err != nil {
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// return as "undefined:<port>"
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return
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}
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var addr4, addr16 net.IP
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for i := range addrs {
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addr := addrs[i].To4()
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if addr == nil {
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// IPv6
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if addr16 == nil {
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addr16 = addrs[i].To16() // IPv6 - 16 bytes
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}
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} else {
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// IPv4
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if addr4 == nil {
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addr4 = addr // IPv4 - 4 bytes
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}
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}
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if addr16 != nil && addr4 != nil {
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// IPv4 & IPv6 have been set, we can stop looking further
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break
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}
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}
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// default to 0 filled 4 byte array for IPv4 if IPv6 only host was found
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if addr4 == nil {
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addr4 = make([]byte, 4)
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}
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// set IPv4 and IPv6 addresses
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ep.Ipv4 = (int32)(binary.BigEndian.Uint32(addr4))
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ep.Ipv6 = []byte(addr16)
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return
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}
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