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database.go
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database.go
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package main
import (
"database/sql"
"fmt"
"log"
_ "github.com/lib/pq"
_ "github.com/jinzhu/gorm/dialects/postgres"
)
// DBConnection stores the reference to the connection to the DB
type DBConnection struct {
db *sql.DB
}
// NewDBConnection creates a new instance of a DBConnection.
func NewDBConnection(addr string) *DBConnection {
db := setupDB(addr)
return &DBConnection{db: db}
}
func setupDB(addr string) *sql.DB {
// Connect to CockroachDB
db, err := sql.Open("postgres", addr)
if err != nil {
log.Fatal(fmt.Sprintf("Failed to connect to database: %v", err))
}
// Create the "servers" and "domains" table.
if _, err := db.Exec(
`CREATE TABLE IF NOT EXISTS domains (
servers_changed BOOL NULL,
ssl_grade VARCHAR(3) NULL,
previous_ssl_grade VARCHAR(3) NULL,
logo STRING NULL,
title STRING NULL,
is_down BOOL NULL,
last_checked TIMESTAMPTZ NULL,
name STRING NOT NULL,
PRIMARY KEY (name),
INDEX lastchecked (last_checked DESC))
`); err != nil {
log.Fatal(err)
}
if _, err := db.Exec(
`CREATE TABLE IF NOT EXISTS servers (
address STRING NOT NULL,
ssl_grade VARCHAR(3) NULL,
country STRING NULL,
owner STRING NULL,
domain_name STRING NOT NULL,
FOREIGN KEY (domain_name) REFERENCES domains(name))
`); err != nil {
log.Fatal(err)
}
return db
}
func (connection *DBConnection) createServer(server Server, domainName string) error {
_, err := connection.db.Exec(
`INSERT INTO servers (address, ssl_grade, country, owner, domain_name)
VALUES ($1, $2, $3, $4, $5)`,
server.Address,
server.SSLGrade,
server.Country,
server.Owner,
domainName,
)
return err
}
func (connection *DBConnection) updateServer(server Server) error {
_, err := connection.db.Exec(
`UPDATE servers
SET ssl_grade = $1, country = $2, owner = $3
WHERE address = $4`,
server.SSLGrade,
server.Country,
server.Owner,
server.Address,
)
return err
}
func (connection *DBConnection) deleteServer(serverAddress string) error {
_, err := connection.db.Exec(
`DELETE FROM servers
WHERE address = $1`,
serverAddress,
)
return err
}
func (connection *DBConnection) getDomains() ([]Domain, error) {
var domains []Domain
rows, err := connection.db.Query("SELECT * FROM domains ORDER BY last_checked DESC")
if err != nil {
log.Fatal(err)
}
defer rows.Close()
for rows.Next() {
var domain Domain
err = rows.Scan(
&domain.ServersChanged, &domain.SSLGrade,
&domain.PreviousSSLGrade, &domain.Logo, &domain.Title,
&domain.IsDown, &domain.LastChecked, &domain.Name,
)
if err != nil {
log.Fatal(err)
}
rows2, err := connection.db.Query(
`SELECT address, ssl_grade, country, owner FROM servers WHERE domain_name = $1`,
domain.Name,
)
if err != nil {
log.Fatal(err)
}
defer rows2.Close()
for rows2.Next() {
var server Server
err := rows2.Scan(&server.Address, &server.SSLGrade, &server.Country, &server.Owner)
if err != nil {
log.Fatal(err)
}
domain.Servers = append(domain.Servers, server)
}
domains = append(domains, domain)
}
return domains, err
}
func (connection *DBConnection) getDomain(domainName string) (Domain, error) {
var domain Domain
rows, err := connection.db.Query(`SELECT * FROM domains WHERE name = $1`, domainName)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
if rows.Next() {
err = rows.Scan(
&domain.ServersChanged, &domain.SSLGrade,
&domain.PreviousSSLGrade, &domain.Logo, &domain.Title,
&domain.IsDown, &domain.LastChecked, &domain.Name,
)
if err != nil {
log.Fatal(err)
}
rows2, err := connection.db.Query(
`SELECT address, ssl_grade, country, owner FROM servers WHERE domain_name = $1`,
domain.Name,
)
if err != nil {
log.Fatal(err)
}
defer rows2.Close()
for rows2.Next() {
var server Server
err := rows2.Scan(&server.Address, &server.SSLGrade, &server.Country, &server.Owner)
if err != nil {
log.Fatal(err)
}
domain.Servers = append(domain.Servers, server)
}
}
return domain, err
}
func (connection *DBConnection) createDomain(domain Domain) {
connection.db.Exec(
`INSERT INTO domains
(servers_changed, ssl_grade, previous_ssl_grade,
logo, title, is_down, last_checked, name)
VALUES ($1, $2, $3, $4, $5, $6, $7, $8)`,
domain.ServersChanged,
domain.SSLGrade,
domain.PreviousSSLGrade,
domain.Logo,
domain.Title,
domain.IsDown,
domain.LastChecked,
domain.Name,
)
for _, server := range domain.Servers {
connection.createServer(server, domain.Name)
}
}
func (connection *DBConnection) updateDomain(domain Domain) error {
_, err := connection.db.Exec(
`UPDATE domains
SET servers_changed = $1, ssl_grade = $2, previous_ssl_grade = $3,
logo = $4, title = $5, is_down = $6, last_checked = $7
WHERE name = $8`,
domain.ServersChanged,
domain.SSLGrade,
domain.PreviousSSLGrade,
domain.Logo,
domain.Title,
domain.IsDown,
domain.LastChecked,
domain.Name,
)
return err
}