Add profiler, edit to database behaviour (Add retries)

.gitignore

@@ -6,3 +6,4 @@ bin/
 config.json
 chromagies
 log.txt
+__debug*

main.go

@@ -37,7 +37,7 @@ func main() {
 
 	var conf config.Server = (config.GetConfig()).Server
 
-	http.ListenAndServe(fmt.Sprintf("%s:%s", conf.IP, conf.Port), router)
+	http.ListenAndServe(fmt.Sprintf("%s:%d", conf.IP, conf.Port), router)
 	stopServer()
 }
 
@@ -71,7 +71,7 @@ func initConfig() {
 	}
 
 	if err != nil {
-		log.Fatal("Cannot read/write config file !")
+		log.Fatalln("Cannot read/write config file !")
 	}
 }
 

src/api/api.go

@@ -1,22 +1,32 @@
 package api
 
 import (
+	"chromagies/src/database"
+	"chromagies/src/profiler"
 	"fmt"
 	"net/http"
+	"time"
 
 	"github.com/gorilla/mux"
 )
 
+const (
+	profiler_API_PROCESS_REQUEST string = "API Process Request"
+)
+
 var apiRootPath string = "/api/v1"
 
 func Init(router *mux.Router) {
 
+	profiler.Register(profiler_API_PROCESS_REQUEST, 10000, "µs")
+
 	router.HandleFunc(apiRootPath, apiRoot).Methods("GET")
 
 	routerAuth := router.PathPrefix(apiRootPath + "/auth").Subrouter()
 	routerPage := router.PathPrefix(apiRootPath + "/page").Subrouter()
 	routerUser := router.PathPrefix(apiRootPath + "/user").Subrouter()
 	routerTag := router.PathPrefix(apiRootPath + "/tag").Subrouter()
+	routerDebug := router.PathPrefix(apiRootPath + "/debug").Subrouter()
 
 	routerAuth.HandleFunc("", apiAuth)
 	routerAuth.HandleFunc("/login", apiAuthLogin)
@@ -32,67 +42,118 @@ func Init(router *mux.Router) {
 
 	routerTag.HandleFunc("", apiTag)
 	routerTag.HandleFunc("/{name}", apiTagName)
+
+	routerDebug.HandleFunc("/profiler", apiDebugProfiler)
+	routerDebug.HandleFunc("/profiler/{name}", apiDebugProfilerName)
 }
 
 // API ROOT
 
 func apiRoot(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
 	fmt.Fprintf(w, "API ROOT")
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
 }
 
 // API Auth
 
 func apiAuth(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
 	fmt.Fprintf(w, "API Auth")
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
 }
 
 func apiAuthLogin(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
 	fmt.Fprintf(w, "API Auth Login")
+	database.Ping()
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
 }
 
 func apiAuthLogout(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
 	fmt.Fprintf(w, "API Auth Logout")
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
 }
 
 // API Page
 
 func apiPage(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
 	fmt.Fprintf(w, "API Page")
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
 }
 
 func apiPageFolder(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
 	vars := mux.Vars(r)
 	fmt.Fprintf(w, "API Page Folder(%s)", vars["folder"])
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
 }
 
 func apiPageFolderPage(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
 	vars := mux.Vars(r)
 	fmt.Fprintf(w, "API Page Folder(%s) Page(%s)", vars["folder"], vars["page"])
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
 }
 
 func apiPageFolderPageContent(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
 	vars := mux.Vars(r)
 	fmt.Fprintf(w, "API Page Folder(%s) Page(%s) Content", vars["folder"], vars["page"])
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
 }
 
 // API User
 
 func apiUser(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
 	fmt.Fprintf(w, "API User")
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
 }
 
 func apiUserName(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
 	vars := mux.Vars(r)
 	fmt.Fprintf(w, "API User Name(%s)", vars["name"])
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
 }
 
 // API Tag
 
 func apiTag(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
 	fmt.Fprintf(w, "API Tag")
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
 }
 
 func apiTagName(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
 	vars := mux.Vars(r)
 	fmt.Fprintf(w, "API Tag Name(%s)", vars["name"])
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
+}
+
+// API Tag
+
+func apiDebugProfiler(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
+
+	var entries []string
+	profiler.GetAll(&entries)
+
+	for i := range entries {
+		var entry string = entries[i]
+		fmt.Fprintf(w, "API Debug Profiler(%s)\n\n%s\n\n", entry, string(profiler.Get(entry).ToString()))
+	}
+
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
+}
+
+func apiDebugProfilerName(w http.ResponseWriter, r *http.Request) {
+	tStart := time.Now()
+	vars := mux.Vars(r)
+	fmt.Fprintf(w, "API Debug Profiler(%s)\n%s", vars["name"], string(profiler.Get(vars["name"]).ToString()))
+	profiler.Add(profiler_API_PROCESS_REQUEST, time.Duration(time.Since(tStart).Microseconds()))
 }

src/config/config.go

@@ -10,10 +10,12 @@ const CONFIG_FILE_NAME string = "./config.json"
 const CONFIG_FILE_DEFAULT_CONF string = `{
     "Database": {
         "Host": "localhost",
-        "Port": "3306",
+        "Port": 3306,
         "Database": "Chromagies",
         "User": "chromagies_user",
-        "Password": "12345678"
+        "Password": "12345678",
+        "RetriesOnError": 5,
+        "TimeBetweenRetriesMs": 100
     },
 
     "Logger": {
@@ -21,16 +23,18 @@ const CONFIG_FILE_DEFAULT_CONF string = `{
     },
     "Server": {
         "IP": "0.0.0.0",
-        "Port": "12345"
+        "Port": 12345
     }
 }`
 
 type Database struct {
 	Host                 string
-	Port     string
+	Port                 uint16
 	Database             string
 	User                 string
 	Password             string
+	RetriesOnError       uint16
+	TimeBetweenRetriesMs uint16
 }
 
 type Logger struct {
@@ -39,7 +43,7 @@ type Logger struct {
 
 type Server struct {
 	IP   string
-	Port string
+	Port uint16
 }
 
 type Config struct {

src/database/database.go

@@ -2,38 +2,44 @@ package database
 
 import (
 	"chromagies/src/config"
+	"chromagies/src/profiler"
 	"database/sql"
 	"fmt"
 	"log"
+	"time"
 
 	_ "github.com/go-sql-driver/mysql"
 )
 
+const (
+	profiler_DATABASE_CONNECT string = "Database Connect"
+	profiler_DATABASE_QUERY   string = "Database Query"
+	profiler_DATABASE_PING    string = "Database Ping"
+)
+
 var db *sql.DB
 var dbConfig config.Database
-var dbPath string
+var isInit bool
 
 func Init() {
-	var err error
+	if isInit {
+		return
+	}
+
 	dbConfig = config.GetConfig().Database
-	dbPath = fmt.Sprintf("%s:%s@(%s:%s)/%s?parseTime=true", dbConfig.User, dbConfig.Password, dbConfig.Host, dbConfig.Port, dbConfig.Database)
 
-	db, err = sql.Open("mysql", dbPath)
+	profiler.Register(profiler_DATABASE_CONNECT, 20, "µs")
-	if err != nil {
+	profiler.Register(profiler_DATABASE_QUERY, 4000, "µs")
-		log.Println("Cannot connect to database !")
+	profiler.Register(profiler_DATABASE_PING, 20, "µs")
-		log.Fatal(err)
-	}
 
-	err = db.Ping()
+	isInit = true
-	if err != nil {
+
-		log.Println("Cannot ping the database !")
+	Connect()
-		log.Fatal(err)
-	}
 
 	var query string = `SHOW GRANTS;`
 	var rows *sql.Rows = executeQuery(query)
+	if rows != nil {
 		defer rows.Close()
-
 		for rows.Next() {
 			var res string
 			rows.Scan(&res)
@@ -41,14 +47,111 @@ func Init() {
 		}
 	}
 
+}
+
+func Terminate() {
+	isInit = false
+	if db != nil {
+		db.Close()
+		db = nil
+	}
+}
+
+func Connect() {
+	if !isInit {
+		return
+	}
+
+	if db != nil {
+		db.Close()
+	}
+
+	var err error
+	var dbPath string = fmt.Sprintf("%s:%s@(%s:%d)/%s?parseTime=true", dbConfig.User, dbConfig.Password, dbConfig.Host, dbConfig.Port, dbConfig.Database)
+	log.Printf("Connecting to database %s at %s:%d as %s\n", dbConfig.Database, dbConfig.Host, dbConfig.Port, dbConfig.User)
+
+	tStart := time.Now()
+	for i := range dbConfig.RetriesOnError {
+		db, err = sql.Open("mysql", dbPath)
+		if err == nil {
+			break
+		}
+		log.Printf("Error while connecting the database [%d/%d] : %s\n", i+1, dbConfig.RetriesOnError, err)
+		time.Sleep((time.Duration)(dbConfig.TimeBetweenRetriesMs) * time.Millisecond)
+	}
+	profiler.Add(profiler_DATABASE_CONNECT, time.Duration(time.Since(tStart).Microseconds()))
+
+	if err != nil {
+		log.Fatalln("Cannot connect to database !")
+	}
+
+	Ping()
+}
+
+func Disconnect() {
+	if !isInit {
+		return
+	}
+
+	if db == nil {
+		return
+	}
+
+	db.Close()
+}
+
+func Ping() {
+	if !isInit {
+		return
+	}
+
+	if db == nil {
+		return
+	}
+
+	var err error
+	tStart := time.Now()
+	for i := range dbConfig.RetriesOnError {
+		err = db.Ping()
+		if err == nil {
+			break
+		}
+		log.Printf("Error while pinging the database [%d/%d] : %s\n", i+1, dbConfig.RetriesOnError, err)
+		time.Sleep((time.Duration)(dbConfig.TimeBetweenRetriesMs) * time.Millisecond)
+	}
+	profiler.Add(profiler_DATABASE_PING, time.Duration(time.Since(tStart).Microseconds()))
+
+	if err != nil {
+		log.Fatalln("Cannot ping the database !")
+	}
+}
+
 func executeQuery(query string) *sql.Rows {
+	if !isInit {
+		return nil
+	}
+
+	if db == nil {
+		return nil
+	}
+
+	Ping()
+
 	var err error
 	var rows *sql.Rows
-
+	tStart := time.Now()
+	for i := range dbConfig.RetriesOnError {
 		rows, err = db.Query(query)
+		if err == nil {
+			break
+		}
+		log.Printf("Error while querying the database [%d/%d] : %s\n", i+1, dbConfig.RetriesOnError, err)
+		time.Sleep((time.Duration)(dbConfig.TimeBetweenRetriesMs) * time.Millisecond)
+	}
+	profiler.Add(profiler_DATABASE_QUERY, time.Duration(time.Since(tStart).Microseconds()))
+
 	if err != nil {
-		log.Println("Error while query DB :")
+		log.Fatalln("Cannot query the database !")
-		log.Fatal(err)
 	}
 
 	return rows

src/profiler/profiler.go

@@ -0,0 +1,139 @@
+package profiler
+
+import (
+	"fmt"
+	"log"
+	"maps"
+	"math"
+	"slices"
+	"sync"
+	"time"
+)
+
+const PROFILER_DEFAULT_MAX_COUNT uint32 = 1000
+const PROFILER_DEFAULT_UNIT string = ""
+
+type Data struct {
+	count     uint32
+	mean      float64
+	min       time.Duration
+	max       time.Duration
+	lastValue time.Duration
+	unit      string
+}
+
+type Profile struct {
+	sync.RWMutex
+	unit      string
+	count     uint32
+	maxCount  uint32
+	index     uint32
+	sum       time.Duration
+	mean      float64
+	values    []time.Duration
+	lastValue time.Duration
+}
+
+var profiles map[string]*Profile = make(map[string]*Profile)
+
+func Register(entry string, maxValues uint32, unit string) {
+	var profile *Profile
+	var exist bool
+	profile, exist = profiles[entry]
+
+	if exist && (profile != nil) {
+		return
+	}
+
+	profile = new(Profile)
+	profile.maxCount = maxValues
+	profile.values = make([]time.Duration, profile.maxCount)
+	profile.unit = unit
+	profiles[entry] = profile
+}
+
+func Add(entry string, duration time.Duration) {
+	var profile *Profile
+	var exist bool
+	profile, exist = profiles[entry]
+
+	if !exist || (profile == nil) {
+		profile = new(Profile)
+		profile.maxCount = PROFILER_DEFAULT_MAX_COUNT
+		profile.values = make([]time.Duration, profile.maxCount)
+		profile.unit = PROFILER_DEFAULT_UNIT
+		profiles[entry] = profile
+	}
+
+	profile.Lock()
+
+	var lastValue time.Duration = profile.values[profile.index]
+	profile.values[profile.index] = duration
+	profile.index++
+	if profile.index >= profile.maxCount {
+		profile.index = 0
+	}
+
+	if profile.count < profile.maxCount {
+		profile.count++
+	}
+
+	profile.sum += duration - lastValue
+	profile.mean = (((float64)(profile.sum)) / (float64)(time.Duration(profile.count)))
+	profile.lastValue = duration
+
+	profile.Unlock()
+}
+
+func GetAll(entries *[]string) {
+	*entries = slices.Collect(maps.Keys(profiles))
+}
+
+func Get(entry string) Data {
+	var profile *Profile
+	var exist bool
+	profile, exist = profiles[entry]
+
+	if !exist || (profile == nil) {
+		profile = new(Profile)
+		profiles[entry] = profile
+	}
+
+	var data Data
+
+	profile.RLock()
+
+	data.mean = profile.mean
+	data.min = math.MaxInt64
+	data.max = 0
+	data.count = profile.count
+	data.unit = profile.unit
+	data.lastValue = profile.lastValue
+	for i := range profile.count {
+		value := profile.values[i]
+		if value < data.min {
+			data.min = value
+		}
+		if value > data.max {
+			data.max = value
+		}
+	}
+
+	profile.RUnlock()
+
+	return data
+}
+
+func (data Data) ToString() string {
+	return fmt.Sprintf(`
+        - Last value :       %d %s
+        - Mean :             %f %s
+        - Min :              %d %s
+        - Max :              %d %s
+        - Number of values : %d
+    `, data.lastValue, data.unit, data.mean, data.unit, data.min, data.unit, data.max, data.unit, data.count)
+}
+
+func Log(entry string) {
+	log.Println(Get(entry).ToString())
+}