func (t *tracer) pidsForContainer(id string) ([]int, error) {
var container docker.Container
t.docker.WalkContainers(func(c docker.Container) {
if c.ID() == id {
container = c
}
})
if container == nil {
return []int{}, fmt.Errorf("Not Found")
}
pidTree, err := process.NewTree(process.NewWalker("/proc"))
if err != nil {
return []int{}, err
}
return pidTree.GetChildren(container.PID())
}
func TestTree(t *testing.T) {
walker := &mockWalker{
processes: []process.Process{
{PID: 1, PPID: 0, Name: "init"},
{PID: 2, PPID: 1, Name: "bash"},
{PID: 3, PPID: 1, Name: "apache", Threads: 2},
{PID: 4, PPID: 2, Name: "ping", Cmdline: "ping foo.bar.local"},
},
}
tree, err := process.NewTree(walker)
if err != nil {
t.Fatalf("newProcessTree error: %v", err)
}
for pid, want := range map[int]int{2: 1, 3: 1, 4: 2} {
have, err := tree.GetParent(pid)
if err != nil || !reflect.DeepEqual(want, have) {
t.Errorf("%d: want %#v, have %#v (%v)", pid, want, have, err)
}
}
}
func (t *tracer) http(port int) {
router := mux.NewRouter()
router.Methods("GET").Path("/container").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
pidTree, err := process.NewTree(process.NewWalker("/proc"))
if err != nil {
respondWith(w, http.StatusBadRequest, err.Error())
return
}
containers := []Container{}
t.docker.WalkContainers(func(container docker.Container) {
children, _ := pidTree.GetChildren(container.PID())
out := Container{
Name: strings.TrimPrefix(container.Container().Name, "/"),
ID: container.ID(),
PIDs: children,
}
containers = append(containers, out)
})
respondWith(w, http.StatusOK, containers)
})
router.Methods("POST").Path("/container/{id}").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
children, err := t.pidsForContainer(id)
if err != nil {
respondWith(w, http.StatusBadRequest, err.Error())
return
}
for _, pid := range children {
t.ptrace.TraceProcess(pid)
}
w.WriteHeader(204)
})
router.Methods("DELETE").Path("/container/{id}").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
children, err := t.pidsForContainer(id)
if err != nil {
respondWith(w, http.StatusBadRequest, err.Error())
return
}
for _, pid := range children {
t.ptrace.StopTracing(pid)
}
w.WriteHeader(204)
})
router.Methods("GET").Path("/pid").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
respondWith(w, http.StatusOK, t.ptrace.AttachedPIDs())
})
router.Methods("POST").Path("/pid/{pid:\\d+}").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
pid, err := strconv.Atoi(mux.Vars(r)["pid"])
if err != nil {
respondWith(w, http.StatusBadRequest, err.Error())
return
}
t.ptrace.TraceProcess(pid)
w.WriteHeader(204)
})
router.Methods("DELETE").Path("/pid/{pid:\\d+}").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
pid, err := strconv.Atoi(mux.Vars(r)["pid"])
if err != nil {
respondWith(w, http.StatusBadRequest, err.Error())
return
}
t.ptrace.StopTracing(pid)
w.WriteHeader(204)
})
router.Methods("GET").Path("/traces").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
respondWith(w, http.StatusOK, t.store.Traces())
})
mime.AddExtensionType(".svg", "image/svg+xml")
router.Methods("GET").PathPrefix("/").Handler(http.FileServer(FS(false))) // everything else is static
log.Printf("Launching HTTP API on port %d", port)
srv := &http.Server{
Addr: fmt.Sprintf(":%d", port),
Handler: router,
}
if err := srv.ListenAndServe(); err != nil {
log.Printf("Unable to create http listener: %v", err)
}
}