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package memsizeui
import (
"bytes"
"fmt"
"html/template"
"net/http"
"reflect"
"sort"
"strings"
"sync"
"time"
"github.com/fjl/memsize"
)
type Handler struct {
init sync.Once
mux http.ServeMux
mu sync.Mutex
reports map[int]Report
roots map[string]interface{}
reportID int
}
type Report struct {
ID int
Date time.Time
Duration time.Duration
RootName string
Sizes memsize.Sizes
}
type templateInfo struct {
Roots []string
Reports map[int]Report
PathDepth int
Data interface{}
}
func (ti *templateInfo) Link(path ...string) string {
prefix := strings.Repeat("../", ti.PathDepth)
return prefix + strings.Join(path, "")
}
func (h *Handler) Add(name string, v interface{}) {
rv := reflect.ValueOf(v)
if rv.Kind() != reflect.Ptr || rv.IsNil() {
panic("root must be non-nil pointer")
}
h.mu.Lock()
if h.roots == nil {
h.roots = make(map[string]interface{})
}
h.roots[name] = v
h.mu.Unlock()
}
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
h.init.Do(func() {
h.reports = make(map[int]Report)
h.mux.HandleFunc("/", h.handleRoot)
h.mux.HandleFunc("/scan", h.handleScan)
h.mux.HandleFunc("/report/", h.handleReport)
})
h.mux.ServeHTTP(w, r)
}
func (h *Handler) templateInfo(r *http.Request, data interface{}) *templateInfo {
h.mu.Lock()
roots := make([]string, 0, len(h.roots))
for name := range h.roots {
roots = append(roots, name)
}
h.mu.Unlock()
sort.Strings(roots)
return &templateInfo{
Roots: roots,
Reports: h.reports,
PathDepth: strings.Count(r.URL.Path, "/") - 1,
Data: data,
}
}
func (h *Handler) handleRoot(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
serveHTML(w, rootTemplate, http.StatusOK, h.templateInfo(r, nil))
}
func (h *Handler) handleScan(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
http.Error(w, "invalid HTTP method, want POST", http.StatusMethodNotAllowed)
return
}
ti := h.templateInfo(r, "Unknown root")
id, ok := h.scan(r.URL.Query().Get("root"))
if !ok {
serveHTML(w, notFoundTemplate, http.StatusNotFound, ti)
return
}
w.Header().Add("Location", ti.Link(fmt.Sprintf("report/%d", id)))
w.WriteHeader(http.StatusSeeOther)
}
func (h *Handler) handleReport(w http.ResponseWriter, r *http.Request) {
var id int
fmt.Sscan(strings.TrimPrefix(r.URL.Path, "/report/"), &id)
h.mu.Lock()
report, ok := h.reports[id]
h.mu.Unlock()
if !ok {
serveHTML(w, notFoundTemplate, http.StatusNotFound, h.templateInfo(r, "Report not found"))
} else {
serveHTML(w, reportTemplate, http.StatusOK, h.templateInfo(r, report))
}
}
func (h *Handler) scan(root string) (int, bool) {
h.mu.Lock()
defer h.mu.Unlock()
val, ok := h.roots[root]
if !ok {
return 0, false
}
id := h.reportID
start := time.Now()
sizes := memsize.Scan(val)
h.reports[id] = Report{
ID: id,
RootName: root,
Date: start.Truncate(1 * time.Second),
Duration: time.Since(start),
Sizes: sizes,
}
h.reportID++
return id, true
}
func serveHTML(w http.ResponseWriter, tpl *template.Template, status int, ti *templateInfo) {
w.Header().Set("content-type", "text/html")
var buf bytes.Buffer
if err := tpl.Execute(&buf, ti); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
buf.WriteTo(w)
}
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