--- a/src/kaigo/horori/searcher/server/searcher.go	Fri Apr 24 22:22:12 2020 +0900
+++ b/src/kaigo/horori/searcher/server/searcher.go	Fri May 01 23:45:22 2020 +0900
@@ -1,5 +1,5 @@
  /*
-  Last Change: 2020-04-23 木 14:43:54.
+  Last Change: 2020-05-01 金 10:46:51.
  */
 
 package main
@@ -20,6 +20,7 @@
 	"sort"
 	"strconv"
 	"strings"
+	"time"
 )
 
 type hhs struct {
@@ -56,6 +57,7 @@
     hhash map[string]hhs
 	iymdhash map[string]string
 	iyhash map[string]string
+	logfile string
 )
 
 func init() {
@@ -63,6 +65,7 @@
 	hhsdb = "hhsdb.csv"
 	indexdb = "index.csv"
 	pwdb = "passwd"
+	logfile = "searcher.log"
 }
 
 func main() {
@@ -169,6 +172,15 @@
 	return nil
 }
 
+func write_errlog(no int, msg string) {
+	log := filepath.Join(server_root, logfile)
+	t := time.Now().Format("2006-01-02 15:04")
+	msg = fmt.Sprintf("%s [%02d] %s\n", t, no, msg)
+	f, _ := os.OpenFile(log, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	f.Write([]byte(msg))
+	f.Close()
+}
+
 /** HTTP HANDLERS **/
 /* Get /h/0800012345 -> name:addr:20200101#20210701#... */
 func hhs_handler(w http.ResponseWriter, r *http.Request) {
@@ -230,6 +242,7 @@
 
 	f, err := os.Open(file)
 	if err != nil {
+		write_errlog(1, "cannot open " + file)
 		http.NotFound(w, r)
 		return
 	}
@@ -275,13 +288,14 @@
 /* POST /u/ */
 func uphhsdb_handler(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodPost {
+		write_errlog(10, "not post method")
 		http.NotFound(w, r)
 		return
 	}
 
-	file := filepath.Join(server_root, hhsdb)
-	f, err := os.Create(file)
+	f, err := os.Create(hhsdb)
 	if err != nil {
+		write_errlog(11, "cannot create " + hhsdb)
 		http.NotFound(w, r)
 		return
 	}
@@ -290,6 +304,7 @@
     b, err := ioutil.ReadAll(r.Body)
     r.Body.Close()
 	if err != nil {
+		write_errlog(12, "cannot read req-body")
 		http.NotFound(w, r)
 		return
 	}
@@ -297,12 +312,14 @@
 	br := bytes.NewReader(b)
     zr, err := gzip.NewReader(br)
 	if err != nil {
+		write_errlog(13, "gzip-reader error")
 		http.NotFound(w, r)
         return
 	}
 	n, err := io.Copy(f, zr)
 
 	if err := zr.Close(); err != nil {
+		write_errlog(14, "gzip-reader error")
 		http.NotFound(w, r)
         return
 	}
@@ -315,6 +332,7 @@
 /* POST /ui/20200401/0800012345.tgz */
 func upimage_handler(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodPost {
+		write_errlog(20, "not post method")
 		http.NotFound(w, r)
 		return
 	}
@@ -332,6 +350,7 @@
 	file := filepath.Join(server_root, "images", ymd, tgz)
 	f, err := os.Create(file)
 	if err != nil {
+		write_errlog(21, "cannot create " + file)
 		http.NotFound(w, r)
 		return
 	}
@@ -339,6 +358,7 @@
 
 	n, err := io.Copy(f, r.Body)
 	if err != nil {
+		write_errlog(22, "cannot copy req-body")
 		http.NotFound(w, r)
 		return
 	}
@@ -410,6 +430,7 @@
 func pw_handler(w http.ResponseWriter, r *http.Request) {
     b, err := ioutil.ReadFile(pwdb)
 	if err != nil {
+		write_errlog(30, "cannot read passwd-file")
 		http.NotFound(w, r)
 		return
 	}