// computeDistance returns the distance between the two network coordinates in
// seconds. If either of the coordinates is nil then this will return positive
// infinity.
func computeDistance(a *coordinate.Coordinate, b *coordinate.Coordinate) float64 {
if a == nil || b == nil {
return math.Inf(1.0)
}
return a.DistanceTo(b).Seconds()
}
func (c *RTTCommand) Run(args []string) int {
var wan bool
cmdFlags := flag.NewFlagSet("rtt", flag.ContinueOnError)
cmdFlags.Usage = func() { c.Ui.Output(c.Help()) }
cmdFlags.BoolVar(&wan, "wan", false, "wan")
httpAddr := HTTPAddrFlag(cmdFlags)
if err := cmdFlags.Parse(args); err != nil {
return 1
}
// They must provide at least one node.
nodes := cmdFlags.Args()
if len(nodes) < 1 || len(nodes) > 2 {
c.Ui.Error("One or two node names must be specified")
c.Ui.Error("")
c.Ui.Error(c.Help())
return 1
}
// Create and test the HTTP client.
conf := api.DefaultConfig()
conf.Address = *httpAddr
client, err := api.NewClient(conf)
if err != nil {
c.Ui.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
return 1
}
coordClient := client.Coordinate()
var source string
var coord1, coord2 *coordinate.Coordinate
if wan {
source = "WAN"
// Default the second node to the agent if none was given.
if len(nodes) < 2 {
agent := client.Agent()
self, err := agent.Self()
if err != nil {
c.Ui.Error(fmt.Sprintf("Unable to look up agent info: %s", err))
return 1
}
node, dc := self["Config"]["NodeName"], self["Config"]["Datacenter"]
nodes = append(nodes, fmt.Sprintf("%s.%s", node, dc))
}
// Parse the input nodes.
parts1 := strings.Split(nodes[0], ".")
parts2 := strings.Split(nodes[1], ".")
if len(parts1) != 2 || len(parts2) != 2 {
c.Ui.Error("Node names must be specified as <node name>.<datacenter> with -wan")
return 1
}
node1, dc1 := parts1[0], parts1[1]
node2, dc2 := parts2[0], parts2[1]
// Pull all the WAN coordinates.
dcs, err := coordClient.Datacenters()
if err != nil {
c.Ui.Error(fmt.Sprintf("Error getting coordinates: %s", err))
return 1
}
// See if the requested nodes are in there.
for _, dc := range dcs {
for _, entry := range dc.Coordinates {
if dc.Datacenter == dc1 && entry.Node == node1 {
coord1 = entry.Coord
}
if dc.Datacenter == dc2 && entry.Node == node2 {
coord2 = entry.Coord
}
if coord1 != nil && coord2 != nil {
goto SHOW_RTT
}
}
}
} else {
source = "LAN"
// Default the second node to the agent if none was given.
if len(nodes) < 2 {
agent := client.Agent()
node, err := agent.NodeName()
if err != nil {
c.Ui.Error(fmt.Sprintf("Unable to look up agent info: %s", err))
return 1
}
nodes = append(nodes, node)
}
// Pull all the LAN coordinates.
entries, _, err := coordClient.Nodes(nil)
if err != nil {
c.Ui.Error(fmt.Sprintf("Error getting coordinates: %s", err))
return 1
}
// See if the requested nodes are in there.
for _, entry := range entries {
if entry.Node == nodes[0] {
coord1 = entry.Coord
}
if entry.Node == nodes[1] {
coord2 = entry.Coord
}
if coord1 != nil && coord2 != nil {
goto SHOW_RTT
}
}
}
// Make sure we found both coordinates.
if coord1 == nil {
c.Ui.Error(fmt.Sprintf("Could not find a coordinate for node %q", nodes[0]))
return 1
}
if coord2 == nil {
c.Ui.Error(fmt.Sprintf("Could not find a coordinate for node %q", nodes[1]))
return 1
}
SHOW_RTT:
// Report the round trip time.
dist := fmt.Sprintf("%.3f ms", coord1.DistanceTo(coord2).Seconds()*1000.0)
c.Ui.Output(fmt.Sprintf("Estimated %s <-> %s rtt: %s (using %s coordinates)", nodes[0], nodes[1], dist, source))
return 0
}
