You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
56 lines
1.6 KiB
Go
56 lines
1.6 KiB
Go
package main
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"fmt"
|
|
"sync/atomic"
|
|
"time"
|
|
)
|
|
|
|
// NewObjectId returns a new unique ObjectId.
|
|
// This function causes a runtime error if it fails to get the hostname
|
|
// of the current machine.
|
|
func newRequestId() RequestId {
|
|
b := make([]byte, 12)
|
|
// Timestamp, 4 bytes, big endian
|
|
binary.BigEndian.PutUint32(b, uint32(time.Now().Unix()))
|
|
b[4] = global.machineId[0]
|
|
b[5] = global.machineId[1]
|
|
b[6] = global.machineId[2]
|
|
// Pid, 2 bytes, specs don't specify endianness, but we use big endian.
|
|
b[7] = byte(global.pid >> 8)
|
|
b[8] = byte(global.pid)
|
|
// Increment, 3 bytes, big endian
|
|
i := atomic.AddUint32(&global.requestCounter, 1)
|
|
b[9] = byte(i >> 16)
|
|
b[10] = byte(i >> 8)
|
|
b[11] = byte(i)
|
|
return RequestId(b)
|
|
}
|
|
|
|
// RequestId is used for tagging each incoming http request for logging
|
|
// purposes. The actual implementation is just the ObjectId implementation
|
|
// found in launchpad.net/mgo/bson. This will most likely change and evolve
|
|
// into its own format.
|
|
type RequestId string
|
|
|
|
func (id RequestId) String() string {
|
|
return fmt.Sprintf("%x", string(id))
|
|
}
|
|
|
|
// Time returns the timestamp part of the id.
|
|
// It's a runtime error to call this method with an invalid id.
|
|
func (id RequestId) Time() time.Time {
|
|
secs := int64(binary.BigEndian.Uint32(id.byteSlice(0, 4)))
|
|
return time.Unix(secs, 0)
|
|
}
|
|
|
|
// byteSlice returns byte slice of id from start to end.
|
|
// Calling this function with an invalid id will cause a runtime panic.
|
|
func (id RequestId) byteSlice(start, end int) []byte {
|
|
if len(id) != 12 {
|
|
panic(fmt.Sprintf("Invalid RequestId: %q", string(id)))
|
|
}
|
|
return []byte(string(id)[start:end])
|
|
}
|