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hardware.go
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hardware.go
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package database
import (
"database/sql"
"fmt"
)
// Hardware node
type HardwareNode struct {
Name string `json:"name"`
Online bool `json:"online"`
Enabled bool `json:"enabled"` // Can be used to temporarily deactivate a node in case of maintenance
Url string `json:"url"`
Token string `json:"token"`
}
// Creates the table (unless it exists) which contains the hardware node
// If the database fails, this function returns an error
func createHardwareNodeTable() error {
query := `
CREATE TABLE
IF NOT EXISTS
hardware(
Url VARCHAR(50),
Online BOOLEAN DEFAULT TRUE,
Enabled BOOLEAN DEFAULT TRUE,
Name VARCHAR(30),
Token VARCHAR(100),
PRIMARY KEY (url)
)
`
if _, err := db.Exec(query); err != nil {
log.Error("Failed to create hardware table: executing query failed: ", err.Error())
return err
}
return nil
}
// Adds a new hardware node to the database
// If the node already exists (same url), its name will be updated
func CreateHardwareNode(node HardwareNode) error {
query, err := db.Prepare(`
INSERT INTO
hardware(
Url,
Online,
Enabled,
Name,
Token
)
VALUES(?, DEFAULT, DEFAULT, ?, ?)
ON DUPLICATE KEY
UPDATE Name=VALUES(Name)
`)
if err != nil {
log.Error("Failed to create a new node: prepearing query failed: ", err.Error())
return err
}
defer query.Close()
res, err := query.Exec(node.Url, node.Name, node.Token)
if err != nil {
log.Error("Failed to create a new node: executing query failed: ", err.Error())
return err
}
rowsAffected, err := res.RowsAffected()
if err != nil {
log.Error("Could not get result of AddNode: obtaining rowsAffected failed: ", err.Error())
return err
}
if rowsAffected > 0 {
log.Debug(fmt.Sprintf("Added hardware node `%s` with url `%s`", node.Name, node.Url))
}
return nil
}
// Updates the online / offline state of a given node (using its url)
func SetNodeOnline(nodeUrl string, online bool) error {
query, err := db.Prepare(`
UPDATE hardware
SET Online=?
WHERE Url=?
`)
if err != nil {
log.Error("Failed to mark uptime status of node: preparing query failed: ", err.Error())
return err
}
defer query.Close()
if _, err := query.Exec(online, nodeUrl); err != nil {
log.Error("Failed to mark uptime status of node: executing query failed: ", err.Error())
return err
}
return nil
}
// Deletes a node given its url
func DeleteHardwareNode(url string) error {
query, err := db.Prepare(`
DELETE FROM
hardware
WHERE Url=?
`)
if err != nil {
log.Error("Failed to delete hardware node: preparing query failed: ", err.Error())
return err
}
defer query.Close()
if _, err = query.Exec(url); err != nil {
log.Error("Failed to delete hardware node: executing query failed: ", err.Error())
return err
}
return nil
}
// Returns a list of hardware nodes
func GetHardwareNodes() ([]HardwareNode, error) {
res, err := db.Query(`
SELECT
Url,
Online,
Enabled,
Name,
Token
FROM hardware
`)
if err != nil {
log.Error("Failed to list hardware nodes: executing query failed: ", err.Error())
return nil, err
}
defer res.Close()
nodes := make([]HardwareNode, 0)
for res.Next() {
var node HardwareNode
if err := res.Scan(
&node.Url,
&node.Online,
&node.Enabled,
&node.Name,
&node.Token,
); err != nil {
log.Error("Failed to list hardware nodes: scanning results failed: ", err.Error())
return nil, err
}
nodes = append(nodes, node)
}
return nodes, nil
}
// Returns a hardware node given its url
func GetHardwareNodeByUrl(url string) (HardwareNode, bool, error) {
query, err := db.Prepare(`
SELECT
Url,
Online,
Enabled,
Name,
Token
FROM hardware
WHERE Url=?
`)
if err != nil {
log.Error("Failed to get Hardware node by url: preparing query failed: ", err.Error())
return HardwareNode{}, false, err
}
defer query.Close()
var node HardwareNode
if err := query.QueryRow(url).Scan(
&node.Url,
&node.Online,
&node.Enabled,
&node.Name,
&node.Token,
); err != nil {
if err == sql.ErrNoRows {
return HardwareNode{}, false, nil
}
log.Error("Failed to get Hardware node by url: executing query failed: ", err.Error())
return HardwareNode{}, false, err
}
return node, true, nil
}
// Changes the metadata of a given node
// Does not affect the online boolean
// For changing the online status, use `SetNodeOnline`
func ModifyHardwareNode(
url string,
newEnabled bool,
newName string,
newToken string,
) error {
query, err := db.Prepare(`
UPDATE hardware
SET
Enabled=?,
Name=?,
Token=?
WHERE Url=?
`)
if err != nil {
log.Error("Failed to modify Hardware node: preparing query failed: ", err.Error())
return err
}
defer query.Close()
if _, err := query.Exec(
newEnabled,
newName,
newToken,
url,
); err != nil {
log.Error("Failed to modify Hardware node: executing query failed: ", err.Error())
return err
}
return nil
}