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twin-gatus/config/config.go
2021-10-24 14:51:49 -04:00

322 lines
11 KiB
Go

package config
import (
"errors"
"io/ioutil"
"log"
"os"
"time"
"github.com/TwiN/gatus/v3/alerting"
"github.com/TwiN/gatus/v3/alerting/alert"
"github.com/TwiN/gatus/v3/alerting/provider"
"github.com/TwiN/gatus/v3/config/maintenance"
"github.com/TwiN/gatus/v3/config/ui"
"github.com/TwiN/gatus/v3/config/web"
"github.com/TwiN/gatus/v3/core"
"github.com/TwiN/gatus/v3/security"
"github.com/TwiN/gatus/v3/storage"
"gopkg.in/yaml.v2"
)
const (
// DefaultConfigurationFilePath is the default path that will be used to search for the configuration file
// if a custom path isn't configured through the GATUS_CONFIG_FILE environment variable
DefaultConfigurationFilePath = "config/config.yaml"
// DefaultFallbackConfigurationFilePath is the default fallback path that will be used to search for the
// configuration file if DefaultConfigurationFilePath didn't work
DefaultFallbackConfigurationFilePath = "config/config.yml"
)
var (
// ErrNoEndpointInConfig is an error returned when a configuration file has no endpoints configured
ErrNoEndpointInConfig = errors.New("configuration file should contain at least 1 endpoint")
// ErrConfigFileNotFound is an error returned when the configuration file could not be found
ErrConfigFileNotFound = errors.New("configuration file not found")
// ErrInvalidSecurityConfig is an error returned when the security configuration is invalid
ErrInvalidSecurityConfig = errors.New("invalid security configuration")
)
// Config is the main configuration structure
type Config struct {
// Debug Whether to enable debug logs
Debug bool `yaml:"debug"`
// Metrics Whether to expose metrics at /metrics
Metrics bool `yaml:"metrics"`
// SkipInvalidConfigUpdate Whether to make the application ignore invalid configuration
// if the configuration file is updated while the application is running
SkipInvalidConfigUpdate bool `yaml:"skip-invalid-config-update"`
// DisableMonitoringLock Whether to disable the monitoring lock
// The monitoring lock is what prevents multiple endpoints from being processed at the same time.
// Disabling this may lead to inaccurate response times
DisableMonitoringLock bool `yaml:"disable-monitoring-lock"`
// Security Configuration for securing access to Gatus
Security *security.Config `yaml:"security"`
// Alerting Configuration for alerting
Alerting *alerting.Config `yaml:"alerting"`
// Endpoints List of endpoints to monitor
Endpoints []*core.Endpoint `yaml:"endpoints"`
// Services List of endpoints to monitor
//
// XXX: Remove this in v5.0.0
// XXX: This is not a typo -- not v4.0.0, but v5.0.0 -- I want to give enough time for people to migrate
//
// Deprecated in favor of Endpoints
Services []*core.Endpoint `yaml:"services"`
// Storage is the configuration for how the data is stored
Storage *storage.Config `yaml:"storage"`
// Web is the web configuration for the application
Web *web.Config `yaml:"web"`
// UI is the configuration for the UI
UI *ui.Config `yaml:"ui"`
// Maintenance is the configuration for creating a maintenance window in which no alerts are sent
Maintenance *maintenance.Config `yaml:"maintenance"`
filePath string // path to the file from which config was loaded from
lastFileModTime time.Time // last modification time
}
// HasLoadedConfigurationFileBeenModified returns whether the file that the
// configuration has been loaded from has been modified since it was last read
func (config Config) HasLoadedConfigurationFileBeenModified() bool {
if fileInfo, err := os.Stat(config.filePath); err == nil {
if !fileInfo.ModTime().IsZero() {
return config.lastFileModTime.Unix() != fileInfo.ModTime().Unix()
}
}
return false
}
// UpdateLastFileModTime refreshes Config.lastFileModTime
func (config *Config) UpdateLastFileModTime() {
if fileInfo, err := os.Stat(config.filePath); err == nil {
if !fileInfo.ModTime().IsZero() {
config.lastFileModTime = fileInfo.ModTime()
}
} else {
log.Println("[config][UpdateLastFileModTime] Ran into error updating lastFileModTime:", err.Error())
}
}
// Load loads a custom configuration file
// Note that the misconfiguration of some fields may lead to panics. This is on purpose.
func Load(configFile string) (*Config, error) {
log.Printf("[config][Load] Reading configuration from configFile=%s", configFile)
cfg, err := readConfigurationFile(configFile)
if err != nil {
if os.IsNotExist(err) {
return nil, ErrConfigFileNotFound
}
return nil, err
}
cfg.filePath = configFile
cfg.UpdateLastFileModTime()
return cfg, nil
}
// LoadDefaultConfiguration loads the default configuration file
func LoadDefaultConfiguration() (*Config, error) {
cfg, err := Load(DefaultConfigurationFilePath)
if err != nil {
if err == ErrConfigFileNotFound {
return Load(DefaultFallbackConfigurationFilePath)
}
return nil, err
}
return cfg, nil
}
func readConfigurationFile(fileName string) (config *Config, err error) {
var bytes []byte
if bytes, err = ioutil.ReadFile(fileName); err == nil {
// file exists, so we'll parse it and return it
return parseAndValidateConfigBytes(bytes)
}
return
}
// parseAndValidateConfigBytes parses a Gatus configuration file into a Config struct and validates its parameters
func parseAndValidateConfigBytes(yamlBytes []byte) (config *Config, err error) {
// Expand environment variables
yamlBytes = []byte(os.ExpandEnv(string(yamlBytes)))
// Parse configuration file
if err = yaml.Unmarshal(yamlBytes, &config); err != nil {
return
}
if config != nil && len(config.Services) > 0 { // XXX: Remove this in v5.0.0
log.Println("WARNING: Your configuration is using 'services:', which is deprecated in favor of 'endpoints:'.")
log.Println("WARNING: See https://github.com/TwiN/gatus/issues/191 for more information")
config.Endpoints = append(config.Endpoints, config.Services...)
config.Services = nil
}
// Check if the configuration file at least has endpoints configured
if config == nil || config.Endpoints == nil || len(config.Endpoints) == 0 {
err = ErrNoEndpointInConfig
} else {
validateAlertingConfig(config.Alerting, config.Endpoints, config.Debug)
if err := validateSecurityConfig(config); err != nil {
return nil, err
}
if err := validateEndpointsConfig(config); err != nil {
return nil, err
}
if err := validateWebConfig(config); err != nil {
return nil, err
}
if err := validateUIConfig(config); err != nil {
return nil, err
}
if err := validateMaintenanceConfig(config); err != nil {
return nil, err
}
if err := validateStorageConfig(config); err != nil {
return nil, err
}
}
return
}
func validateStorageConfig(config *Config) error {
if config.Storage == nil {
config.Storage = &storage.Config{
Type: storage.TypeMemory,
}
}
err := storage.Initialize(config.Storage)
if err != nil {
return err
}
// Remove all EndpointStatus that represent endpoints which no longer exist in the configuration
var keys []string
for _, endpoint := range config.Endpoints {
keys = append(keys, endpoint.Key())
}
numberOfEndpointStatusesDeleted := storage.Get().DeleteAllEndpointStatusesNotInKeys(keys)
if numberOfEndpointStatusesDeleted > 0 {
log.Printf("[config][validateStorageConfig] Deleted %d endpoint statuses because their matching endpoints no longer existed", numberOfEndpointStatusesDeleted)
}
return nil
}
func validateMaintenanceConfig(config *Config) error {
if config.Maintenance == nil {
config.Maintenance = maintenance.GetDefaultConfig()
} else {
if err := config.Maintenance.ValidateAndSetDefaults(); err != nil {
return err
}
}
return nil
}
func validateUIConfig(config *Config) error {
if config.UI == nil {
config.UI = ui.GetDefaultConfig()
} else {
if err := config.UI.ValidateAndSetDefaults(); err != nil {
return err
}
}
return nil
}
func validateWebConfig(config *Config) error {
if config.Web == nil {
config.Web = web.GetDefaultConfig()
} else {
return config.Web.ValidateAndSetDefaults()
}
return nil
}
func validateEndpointsConfig(config *Config) error {
for _, endpoint := range config.Endpoints {
if config.Debug {
log.Printf("[config][validateEndpointsConfig] Validating endpoint '%s'", endpoint.Name)
}
if err := endpoint.ValidateAndSetDefaults(); err != nil {
return err
}
}
log.Printf("[config][validateEndpointsConfig] Validated %d endpoints", len(config.Endpoints))
return nil
}
func validateSecurityConfig(config *Config) error {
if config.Security != nil {
if config.Security.IsValid() {
if config.Debug {
log.Printf("[config][validateSecurityConfig] Basic security configuration has been validated")
}
} else {
// If there was an attempt to configure security, then it must mean that some confidential or private
// data are exposed. As a result, we'll force a panic because it's better to be safe than sorry.
return ErrInvalidSecurityConfig
}
}
return nil
}
// validateAlertingConfig validates the alerting configuration
// Note that the alerting configuration has to be validated before the endpoint configuration, because the default alert
// returned by provider.AlertProvider.GetDefaultAlert() must be parsed before core.Endpoint.ValidateAndSetDefaults()
// sets the default alert values when none are set.
func validateAlertingConfig(alertingConfig *alerting.Config, endpoints []*core.Endpoint, debug bool) {
if alertingConfig == nil {
log.Printf("[config][validateAlertingConfig] Alerting is not configured")
return
}
alertTypes := []alert.Type{
alert.TypeCustom,
alert.TypeDiscord,
alert.TypeMattermost,
alert.TypeMessagebird,
alert.TypePagerDuty,
alert.TypeSlack,
alert.TypeTeams,
alert.TypeTelegram,
alert.TypeTwilio,
}
var validProviders, invalidProviders []alert.Type
for _, alertType := range alertTypes {
alertProvider := alertingConfig.GetAlertingProviderByAlertType(alertType)
if alertProvider != nil {
if alertProvider.IsValid() {
// Parse alerts with the provider's default alert
if alertProvider.GetDefaultAlert() != nil {
for _, endpoint := range endpoints {
for alertIndex, endpointAlert := range endpoint.Alerts {
if alertType == endpointAlert.Type {
if debug {
log.Printf("[config][validateAlertingConfig] Parsing alert %d with provider's default alert for provider=%s in endpoint=%s", alertIndex, alertType, endpoint.Name)
}
provider.ParseWithDefaultAlert(alertProvider.GetDefaultAlert(), endpointAlert)
}
}
}
}
validProviders = append(validProviders, alertType)
} else {
log.Printf("[config][validateAlertingConfig] Ignoring provider=%s because configuration is invalid", alertType)
invalidProviders = append(invalidProviders, alertType)
}
} else {
invalidProviders = append(invalidProviders, alertType)
}
}
log.Printf("[config][validateAlertingConfig] configuredProviders=%s; ignoredProviders=%s", validProviders, invalidProviders)
}