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main.go
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main.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"database/sql"
"fmt"
"io"
"net/http"
"os"
"time"
_ "github.com/mattn/go-sqlite3"
"go.uber.org/zap"
)
const (
sqlQuery = "SELECT * FROM contacts"
dbName = "test.db"
tableDefinition = `CREATE TABLE contacts (
contact_id INTEGER PRIMARY KEY,
first_name TEXT NOT NULL,
last_name TEXT NOT NULL,
email TEXT NOT NULL UNIQUE,
phone TEXT NOT NULL UNIQUE);`
tableInsertion = `INSERT INTO 'contacts'
('first_name', 'last_name', 'email', 'phone') VALUES
('Moshe', 'Levi', 'moshe@gmail.com', '052-1234567');`
)
// Server is Http server that exposes multiple endpoints.
type Server struct {
db *sql.DB
}
// Create the db file.
func CreateDb() {
file, err := os.Create(dbName)
if err != nil {
panic(err)
}
err = file.Close()
if err != nil {
panic(err)
}
}
// NewServer creates a server struct after initialing rand.
func NewServer() *Server {
CreateDb()
database, err := sql.Open("sqlite3", dbName)
if err != nil {
panic(err)
}
_, err = database.Exec(tableDefinition)
if err != nil {
panic(err)
}
_, err = database.Exec(tableInsertion)
if err != nil {
panic(err)
}
return &Server{
db: database,
}
}
func (s *Server) queryDb(w http.ResponseWriter, req *http.Request) {
ctx := req.Context()
conn, err := s.db.Conn(ctx)
if err != nil {
panic(err)
}
rows, err := conn.QueryContext(req.Context(), sqlQuery)
if err != nil {
panic(err)
}
logger.Info("queryDb called")
for rows.Next() {
var id int
var firstName string
var lastName string
var email string
var phone string
err := rows.Scan(&id, &firstName, &lastName, &email, &phone)
if err != nil {
panic(err)
}
fmt.Fprintf(w, "ID: %d, firstName: %s, lastName: %s, email: %s, phone: %s\n", id, firstName, lastName, email, phone)
}
}
var logger *zap.Logger
func main() {
var err error
logger, err = zap.NewDevelopment()
if err != nil {
fmt.Printf("error creating zap logger, error:%v", err)
return
}
port := fmt.Sprintf(":%d", 8080)
logger.Info("starting http server", zap.String("port", port))
s := NewServer()
http.HandleFunc("/query_db", s.queryDb)
go func() {
_ = http.ListenAndServe(":8080", nil)
}()
// give time for auto-instrumentation to start up
time.Sleep(5 * time.Second)
resp, err := http.Get("http://localhost:8080/query_db")
if err != nil {
logger.Error("Error performing GET", zap.Error(err))
}
body, err := io.ReadAll(resp.Body)
if err != nil {
logger.Error("Error reading http body", zap.Error(err))
}
logger.Info("Body:\n", zap.String("body", string(body[:])))
_ = resp.Body.Close()
// give time for auto-instrumentation to report signal
time.Sleep(5 * time.Second)
}