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main.go
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main.go
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// sqllite example used
// https://www.codeproject.com/Articles/5261771/Golang-SQLite-Simple-Example
// counter example used
// https://play.golang.org/p/1eDuXo2BkoO
package main
import (
"database/sql"
"flag"
"fmt"
"log"
"net/http"
"os"
"sync/atomic"
"time"
"github.com/google/uuid"
_ "github.com/mattn/go-sqlite3" // Import go-sqlite3 library
)
func main() {
recoverPtr := flag.Bool("recovery", true, "remove database file before run.")
cleanPtr := flag.Bool("cleanup", true, "cleanup database between insert sample")
insertWaitPtr := flag.Int("insertWait", 10, "wait time between inserts in millisecond.")
sleepWaitPtr := flag.Int("sleepWait", 10, "wait time for inserts to complete in seconds.")
insertCountPtr := flag.Int("insertCount", 10000, "how many uuids to insert into the SqlLite database.")
metricsPortPtr := flag.String("metricsPort", ":8080", "TCP port for metrics server to run from.")
flag.Parse()
if *recoverPtr {
err := os.Remove("sqlite-database.db") // I delete the file to avoid duplicated records.
if err != nil {
log.Println("no database file present.")
}
}
insertWait := time.Duration(*insertWaitPtr)
sleepWait := time.Duration(*sleepWaitPtr)
insertCount := *insertCountPtr
metricsPort := *metricsPortPtr
// SQLite is a file based database.
var passC count32
var failC count32
test := &test{
&passC,
&failC,
false,
0,
make(map[string]int32),
0,
}
// configure metrics server
metrics := func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, test.PrometheusMetric(insertCount, *insertWaitPtr, *sleepWaitPtr))
}
http.HandleFunc("/metrics", metrics)
go http.ListenAndServe(metricsPort, nil)
// start io testing.
for true {
if *cleanPtr {
err := os.Remove("sqlite-database.db") // I delete the file to avoid duplicated records.
if err != nil {
log.Println("no database file present.")
}
}
// sqllite creation
log.Println("Creating sqlite-database.db...")
file, err := os.Create("sqlite-database.db") // Create SQLite file
if err != nil {
log.Fatal(err.Error())
}
file.Close()
log.Println("sqlite-database.db created")
sqliteDatabase, err := sql.Open("sqlite3", "./sqlite-database.db") // Open the created SQLite File
defer sqliteDatabase.Close() // Defer Closing the database
//defer test.Reset()
createTable(sqliteDatabase) // Create Database Tables
insertTestData := `INSERT INTO testdata(text1, text1) VALUES (?, ?)`
statement, err := sqliteDatabase.Prepare(insertTestData) // Prepare statement.
// This is good to avoid SQL injections
if err != nil {
log.Fatalln(err.Error())
}
// INSERT RECORDS
log.Println("Starting inserts.")
for i := 1; i < insertCount; i++ {
go insertTest(sqliteDatabase, statement, test)
time.Sleep(insertWait * time.Millisecond)
}
log.Println("Starating sleep.")
time.Sleep(sleepWait * time.Second)
log.Println("Display")
// DISPLAY INSERTED RECORDS
displayTest(sqliteDatabase, 10)
dropTable(sqliteDatabase)
test.Report()
// to test to stdout. using prometheus npw.
//test.Report()
}
}
func createTable(db *sql.DB) {
createStudentTableSQL := `CREATE TABLE testdata (
"id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
"text1" TEXT,
"text2" TEXT
);` // SQL Statement for Create Table
log.Println("Create test table...")
statement, err := db.Prepare(createStudentTableSQL) // Prepare SQL Statement
if err != nil {
log.Fatal(err.Error())
}
statement.Exec() // Execute SQL Statements
log.Println("test table created")
}
func dropTable(db *sql.DB) {
createStudentTableSQL := "drop TABLE testdata" // SQL Statement for Create Table
log.Println("drop test table...")
statement, err := db.Prepare(createStudentTableSQL) // Prepare SQL Statement
if err != nil {
log.Fatal(err.Error())
}
statement.Exec() // Execute SQL Statements
log.Println("test table dropped.")
}
// We are passing db reference connection from main to our method with other parameters
func insertTest(db *sql.DB, statement *sql.Stmt, test *test) {
text1 := uuid.NewString()
text2 := uuid.NewString()
_, err := statement.Exec(text1, text2)
if err != nil {
test.Fail(err.Error())
return
}
test.Pass()
}
func displayTest(db *sql.DB, limit int) {
row, err := db.Query(fmt.Sprintf("SELECT * FROM testdata LIMIT %d", limit))
if err != nil {
log.Fatal(err)
}
defer row.Close()
for row.Next() { // Iterate and fetch the records from result cursor
var id int
var text1 string
var text2 string
row.Scan(&id, &text1, &text2)
log.Println("test: ", id, " ", text1, " ", text2)
}
}
type count32 int32
func (c *count32) Inc() int32 {
return atomic.AddInt32((*int32)(c), 1)
}
func (c *count32) Get() int32 {
return atomic.LoadInt32((*int32)(c))
}
type test struct {
pass *count32
fail *count32
failure bool
firstFailureSeen int32
failureMessages map[string]int32
resetCount int32
}
func (t *test) Pass() {
t.pass.Inc()
}
func (t *test) Fail(err string) {
if val, ok := t.failureMessages[err]; ok {
t.failureMessages[err] = val + 1
} else {
t.failureMessages[err] = 1
}
t.fail.Inc()
}
func (t *test) Reset() {
var passC count32
var failC count32
t.pass = &passC
t.fail = &failC
t.failureMessages = make(map[string]int32)
t.resetCount++
}
func (t *test) Report() {
log.Println("pass", t.pass.Get())
log.Println("fail", t.fail.Get())
log.Println("first failure", t.firstFailureSeen)
log.Println("failure reasons", t.failureMessages)
}
func (t *test) PrometheusMetric(insertCount int, insertWait int, sleepWait int) string {
pass := fmt.Sprintf("iometrics_sqllite_pass{insertCount=\"%d\",insertWait=\"%d\",sleepWait=\"%d\"} %d", insertCount, insertWait, sleepWait, t.pass.Get())
fail := fmt.Sprintf("iometrics_sqllite_fail{insertCount=\"%d\",insertWait=\"%d\",sleepWait=\"%d\"} %d", insertCount, insertWait, sleepWait, t.fail.Get())
//firstFailure := fmt.Sprintf("iometrics_sqllite_firstFailure{insertCount=\"%d\",insertWait=\"%d\",sleepWait=\"%d\"} %d", insertCount, insertWait, sleepWait, t.firstFailureSeen)
metric := fmt.Sprintf(`
%s
%s`, pass, fail)
return metric
}