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main.go
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main.go
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package main
import (
"log"
"net/http"
"os"
"strconv"
"strings"
"sync"
ma "github.com/willianpc/instana-mock-agent/agent"
)
var (
port string
portsPool int
portMap map[int]*ma.Agent
mainMu sync.Mutex
)
func init() {
portsPool = 29090
port = "9090"
portMap = make(map[int]*ma.Agent)
if p := os.Getenv("MOCK_AGENT_PORT"); p != "" {
port = p
}
}
func spawnAgent(w http.ResponseWriter, r *http.Request) {
mainMu.Lock()
defer mainMu.Unlock()
var newPort int
p := strings.Split(r.URL.Path, "/")
if len(p) != 3 {
// path is neither /spawn/ or /spawn/{port}
w.WriteHeader(http.StatusInternalServerError)
return
}
// /spawn/ called
if p[2] == "" {
portsPool++
if _, ok := portMap[portsPool]; ok {
// port already in use
w.WriteHeader(http.StatusInternalServerError)
return
}
newPort = portsPool
}
// /spawn/some_port called
if p[2] != "" {
agentPort, err := strconv.Atoi(p[2])
if err != nil {
// port is not a number
w.WriteHeader(http.StatusInternalServerError)
return
}
if _, ok := portMap[agentPort]; ok {
// port already in use
w.WriteHeader(http.StatusInternalServerError)
return
}
newPort = agentPort
}
if newPort == 0 {
w.WriteHeader(http.StatusInternalServerError)
return
}
agentSpawn := ma.NewAgent(&ma.Options{
Addr: ":" + strconv.Itoa(newPort),
})
agentSpawn.Start()
portMap[newPort] = agentSpawn
w.Header().Add("X-MOCK-AGENT-PORT", strconv.Itoa(newPort))
_, err := w.Write([]byte(strconv.Itoa(newPort) + "\n"))
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
}
}
func killAgent(w http.ResponseWriter, r *http.Request) {
p := strings.Split(r.URL.Path, "/")
if len(p) != 3 {
w.WriteHeader(http.StatusInternalServerError)
return
}
agentPort, err := strconv.Atoi(p[2])
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
mainMu.Lock()
defer mainMu.Unlock()
if _, ok := portMap[agentPort]; ok {
err = portMap[agentPort].Stop()
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
delete(portMap, agentPort)
w.WriteHeader(http.StatusOK)
return
}
w.WriteHeader(http.StatusInternalServerError)
}
func agentList(w http.ResponseWriter, r *http.Request) {
l := ""
for k := range portMap {
l += ", " + strconv.Itoa(k)
}
_, _ = w.Write([]byte(l))
}
func main() {
http.HandleFunc("/spawn/", spawnAgent)
http.HandleFunc("/kill/", killAgent)
http.HandleFunc("/list", agentList)
log.Fatal(http.ListenAndServe(":"+port, nil))
}