config

Documentation

Index

• Constants
• func Reset()
• type Configuration
  • func Instance() *Configuration
  • func (config *Configuration) Read(fileNames ...string) error
  • func (config *Configuration) Reload() error
• type ConfigurationSettings
  • func Settings() *ConfigurationSettings
• type HAProxyConfigurationSettings
  • func (settings *HAProxyConfigurationSettings) GetProxyAddresses() (addresses [](*url.URL), err error)
  • func (settings *HAProxyConfigurationSettings) IsEmpty() bool
• type HostPort
  • func ParseHostPort(address string) (hostPort *HostPort, err error)
  • func (h *HostPort) String() string
  • func (h *HostPort) URL() *url.URL
• type MySQLClusterConfigurationSettings
• type MySQLConfigurationSettings
• type StaticHostsConfigurationSettings
  • func (settings *StaticHostsConfigurationSettings) IsEmpty() bool
• type StoresSettings
• type VitessConfigurationSettings
  • func (settings *VitessConfigurationSettings) IsEmpty() bool

Constants

const DefaultMySQLPort = 3306

Functions

func Reset

func Reset()

Reset sets the initial state of the configuration instance

Types

type Configuration

type Configuration struct {
	// contains filtered or unexported fields
}

Configuration struct stores the readFileNames and points to the settings which are the configuration parameters used in the application. see ConfigurationSettings for the available settings. Read file names are also stored to allow configuration reloading.

func Instance

func Instance() *Configuration

Instance returns the global instance of Configuration

func (*Configuration) Read

func (config *Configuration) Read(fileNames ...string) error

Read reads configuration from all given files, in order of input. Each file can override the properties of the previous files Initially, the settings are the defult ones defined by newConfigurationSettings

func (*Configuration) Reload

func (config *Configuration) Reload() error

Reload re-reads configuration from last used files

type ConfigurationSettings

type ConfigurationSettings struct {
	ListenPort           int
	DataCenter           string
	Environment          string
	Domain               string
	ShareDomain          string
	RaftBind             string
	RaftDataDir          string
	DefaultRaftPort      int      // if a RaftNodes entry does not specify port, use this one
	RaftNodes            []string // Raft nodes to make initial connection with
	BackendMySQLHost     string
	BackendMySQLPort     int
	BackendMySQLSchema   string
	BackendMySQLUser     string
	BackendMySQLPassword string
	MemcacheServers      []string // if given, freno will report to aggregated values to given memcache
	MemcachePath         string   // use as prefix to metric path in memcache key, e.g. if `MemcachePath` is "myprefix" the key would be "myprefix/mysql/maincluster". Default: "freno"
	Stores               StoresSettings
}

ConfigurationSettings models a set of configurable values, that can be provided by the user via one or several JSON formatted files.

Some of the settinges have reasonable default values, and some other (like database credentials) are strictly expected from user.

func Settings

func Settings() *ConfigurationSettings

Settings returns the settings of the global instance of Configuration

type HAProxyConfigurationSettings

type HAProxyConfigurationSettings struct {
	Host      string
	Port      int
	Addresses string
	PoolName  string
}

func (*HAProxyConfigurationSettings) GetProxyAddresses

func (settings *HAProxyConfigurationSettings) GetProxyAddresses() (addresses [](*url.URL), err error)

func (*HAProxyConfigurationSettings) IsEmpty

func (settings *HAProxyConfigurationSettings) IsEmpty() bool

type HostPort

type HostPort struct {
	Host string
	Port int
}

func ParseHostPort

func ParseHostPort(address string) (hostPort *HostPort, err error)

func (*HostPort) String

func (h *HostPort) String() string

func (*HostPort) URL

func (h *HostPort) URL() *url.URL

type MySQLClusterConfigurationSettings

type MySQLClusterConfigurationSettings struct {
	User                 string   // override MySQLConfigurationSettings's, or leave empty to inherit those settings
	Password             string   // override MySQLConfigurationSettings's, or leave empty to inherit those settings
	MetricQuery          string   // override MySQLConfigurationSettings's, or leave empty to inherit those settings
	CacheMillis          int      // override MySQLConfigurationSettings's, or leave empty to inherit those settings
	ThrottleThreshold    float64  // override MySQLConfigurationSettings's, or leave empty to inherit those settings
	Port                 int      // Specify if different than 3306 or if different than specified by MySQLConfigurationSettings
	IgnoreHostsCount     int      // Number of hosts that can be skipped/ignored even on error or on exceeding theesholds
	IgnoreHostsThreshold float64  // Threshold beyond which IgnoreHostsCount applies (default: 0)
	HttpCheckPort        int      // Specify if different than specified by MySQLConfigurationSettings. -1 to disable HTTP check
	HttpCheckPath        string   // Specify if different than specified by MySQLConfigurationSettings
	IgnoreHosts          []string // override MySQLConfigurationSettings's, or leave empty to inherit those settings

	HAProxySettings     HAProxyConfigurationSettings // If list of servers is to be acquired via HAProxy, provide this field
	VitessSettings      VitessConfigurationSettings  // If list of servers is to be acquired via Vitess, provide this field
	StaticHostsSettings StaticHostsConfigurationSettings
}

type MySQLConfigurationSettings

type MySQLConfigurationSettings struct {
	User                 string
	Password             string
	MetricQuery          string
	CacheMillis          int // optional, if defined then probe result will be cached, and future probes may use cached value
	ThrottleThreshold    float64
	Port                 int      // Specify if different than 3306; applies to all clusters
	IgnoreDialTcpErrors  bool     // Skip hosts where a metric cannot be retrieved due to TCP dial errors
	IgnoreHostsCount     int      // Number of hosts that can be skipped/ignored even on error or on exceeding theesholds
	IgnoreHostsThreshold float64  // Threshold beyond which IgnoreHostsCount applies (default: 0)
	HttpCheckPort        int      // port for HTTP check. -1 to disable.
	HttpCheckPath        string   // If non-empty, requires HttpCheckPort
	IgnoreHosts          []string // If non empty, substrings to indicate hosts to be ignored/skipped
	VitessCells          []string // Name of the Vitess cells for polling tablet hosts

	Clusters map[string](*MySQLClusterConfigurationSettings) // cluster name -> cluster config
}

type StaticHostsConfigurationSettings

type StaticHostsConfigurationSettings struct {
	Hosts []string // a host can be "hostname" or "hostname:port"
}

func (*StaticHostsConfigurationSettings) IsEmpty

func (settings *StaticHostsConfigurationSettings) IsEmpty() bool

type StoresSettings

type StoresSettings struct {
	MySQL MySQLConfigurationSettings // Any and all MySQL setups go here

}

type VitessConfigurationSettings

type VitessConfigurationSettings struct {
	API         string
	Cells       []string
	Keyspace    string
	Shard       string
	TimeoutSecs uint
}

func (*VitessConfigurationSettings) IsEmpty

func (settings *VitessConfigurationSettings) IsEmpty() bool