forked from hashicorp/consul
/
config.go
676 lines (587 loc) · 18.8 KB
/
config.go
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package agent
import (
"encoding/base64"
"encoding/json"
"fmt"
"io"
"net"
"os"
"path/filepath"
"sort"
"strings"
"time"
"github.com/hashicorp/consul/consul"
"github.com/mitchellh/mapstructure"
)
// Ports is used to simplify the configuration by
// providing default ports, and allowing the addresses
// to only be specified once
type PortConfig struct {
DNS int // DNS Query interface
HTTP int // HTTP API
RPC int // CLI RPC
SerfLan int `mapstructure:"serf_lan"` // LAN gossip (Client + Server)
SerfWan int `mapstructure:"serf_wan"` // WAN gossip (Server onlyg)
Server int // Server internal RPC
}
// DNSConfig is used to fine tune the DNS sub-system.
// It can be used to control cache values, and stale
// reads
type DNSConfig struct {
// NodeTTL provides the TTL value for a node query
NodeTTL time.Duration `mapstructure:"-"`
NodeTTLRaw string `mapstructure:"node_ttl" json:"-"`
// ServiceTTL provides the TTL value for a service
// query for given service. The "*" wildcard can be used
// to set a default for all services.
ServiceTTL map[string]time.Duration `mapstructure:"-"`
ServiceTTLRaw map[string]string `mapstructure:"service_ttl" json:"-"`
// AllowStale is used to enable lookups with stale
// data. This gives horizontal read scalability since
// any Consul server can service the query instead of
// only the leader.
AllowStale bool `mapstructure:"allow_stale"`
// MaxStale is used to bound how stale of a result is
// accepted for a DNS lookup. This can be used with
// AllowStale to limit how old of a value is served up.
// If the stale result exceeds this, another non-stale
// stale read is performed.
MaxStale time.Duration `mapstructure:"-"`
MaxStaleRaw string `mapstructure:"max_stale" json:"-"`
}
// Config is the configuration that can be set for an Agent.
// Some of this is configurable as CLI flags, but most must
// be set using a configuration file.
type Config struct {
// Bootstrap is used to bring up the first Consul server, and
// permits that node to elect itself leader
Bootstrap bool `mapstructure:"bootstrap"`
// BootstrapExpect tries to automatically bootstrap the Consul cluster,
// by witholding peers until enough servers join.
BootstrapExpect int `mapstructure:"bootstrap_expect"`
// Server controls if this agent acts like a Consul server,
// or merely as a client. Servers have more state, take part
// in leader election, etc.
Server bool `mapstructure:"server"`
// Datacenter is the datacenter this node is in. Defaults to dc1
Datacenter string `mapstructure:"datacenter"`
// DataDir is the directory to store our state in
DataDir string `mapstructure:"data_dir"`
// DNSRecursor can be set to allow the DNS server to recursively
// resolve non-consul domains
DNSRecursor string `mapstructure:"recursor"`
// DNS configuration
DNSConfig DNSConfig `mapstructure:"dns_config"`
// Domain is the DNS domain for the records. Defaults to "consul."
Domain string `mapstructure:"domain"`
// Encryption key to use for the Serf communication
EncryptKey string `mapstructure:"encrypt" json:"-"`
// LogLevel is the level of the logs to putout
LogLevel string `mapstructure:"log_level"`
// Node name is the name we use to advertise. Defaults to hostname.
NodeName string `mapstructure:"node_name"`
// ClientAddr is used to control the address we bind to for
// client services (DNS, HTTP, RPC)
ClientAddr string `mapstructure:"client_addr"`
// BindAddr is used to control the address we bind to.
// If not specified, the first private IP we find is used.
// This controls the address we use for cluster facing
// services (Gossip, Server RPC)
BindAddr string `mapstructure:"bind_addr"`
// AdvertiseAddr is the address we use for advertising our Serf,
// and Consul RPC IP. If not specified, bind address is used.
AdvertiseAddr string `mapstructure:"advertise_addr"`
// Port configurations
Ports PortConfig
// LeaveOnTerm controls if Serf does a graceful leave when receiving
// the TERM signal. Defaults false. This can be changed on reload.
LeaveOnTerm bool `mapstructure:"leave_on_terminate"`
// SkipLeaveOnInt controls if Serf skips a graceful leave when receiving
// the INT signal. Defaults false. This can be changed on reload.
SkipLeaveOnInt bool `mapstructure:"skip_leave_on_interrupt"`
// StatsiteAddr is the address of a statsite instance. If provided,
// metrics will be streamed to that instance.
StatsiteAddr string `mapstructure:"statsite_addr"`
// Protocol is the Consul protocol version to use.
Protocol int `mapstructure:"protocol"`
// EnableDebug is used to enable various debugging features
EnableDebug bool `mapstructure:"enable_debug"`
// VerifyIncoming is used to verify the authenticity of incoming connections.
// This means that TCP requests are forbidden, only allowing for TLS. TLS connections
// must match a provided certificate authority. This can be used to force client auth.
VerifyIncoming bool `mapstructure:"verify_incoming"`
// VerifyOutgoing is used to verify the authenticity of outgoing connections.
// This means that TLS requests are used. TLS connections must match a provided
// certificate authority. This is used to verify authenticity of server nodes.
VerifyOutgoing bool `mapstructure:"verify_outgoing"`
// CAFile is a path to a certificate authority file. This is used with VerifyIncoming
// or VerifyOutgoing to verify the TLS connection.
CAFile string `mapstructure:"ca_file"`
// CertFile is used to provide a TLS certificate that is used for serving TLS connections.
// Must be provided to serve TLS connections.
CertFile string `mapstructure:"cert_file"`
// KeyFile is used to provide a TLS key that is used for serving TLS connections.
// Must be provided to serve TLS connections.
KeyFile string `mapstructure:"key_file"`
// ServerName is used with the TLS certificates to ensure the name we
// provid ematches the certificate
ServerName string `mapstructure:"server_name"`
// StartJoin is a list of addresses to attempt to join when the
// agent starts. If Serf is unable to communicate with any of these
// addresses, then the agent will error and exit.
StartJoin []string `mapstructure:"start_join"`
// UiDir is the directory containing the Web UI resources.
// If provided, the UI endpoints will be enabled.
UiDir string `mapstructure:"ui_dir"`
// PidFile is the file to store our PID in
PidFile string `mapstructure:"pid_file"`
// EnableSyslog is used to also tee all the logs over to syslog. Only supported
// on linux and OSX. Other platforms will generate an error.
EnableSyslog bool `mapstructure:"enable_syslog"`
// SyslogFacility is used to control where the syslog messages go
// By default, goes to LOCAL0
SyslogFacility string `mapstructure:"syslog_facility"`
// RejoinAfterLeave controls our interaction with the cluster after leave.
// When set to false (default), a leave causes Consul to not rejoin
// the cluster until an explicit join is received. If this is set to
// true, we ignore the leave, and rejoin the cluster on start.
RejoinAfterLeave bool `mapstructure:"rejoin_after_leave"`
// CheckUpdateInterval controls the interval on which the output of a health check
// is updated if there is no change to the state. For example, a check in a steady
// state may run every 5 second generating a unique output (timestamp, etc), forcing
// constant writes. This allows Consul to defer the write for some period of time,
// reducing the write pressure when the state is steady.
CheckUpdateInterval time.Duration `mapstructure:"-"`
CheckUpdateIntervalRaw string `mapstructure:"check_update_interval" json:"-"`
// AEInterval controls the anti-entropy interval. This is how often
// the agent attempts to reconcile it's local state with the server'
// representation of our state. Defaults to every 60s.
AEInterval time.Duration `mapstructure:"-" json:"-"`
// Checks holds the provided check definitions
Checks []*CheckDefinition `mapstructure:"-" json:"-"`
// Services holds the provided service definitions
Services []*ServiceDefinition `mapstructure:"-" json:"-"`
// ConsulConfig can either be provided or a default one created
ConsulConfig *consul.Config `mapstructure:"-" json:"-"`
// Revision is the GitCommit this maps to
Revision string `mapstructure:"-"`
// Version is the release version number
Version string `mapstructure:"-"`
// VersionPrerelease is a label for pre-release builds
VersionPrerelease string `mapstructure:"-"`
}
type dirEnts []os.FileInfo
// DefaultConfig is used to return a sane default configuration
func DefaultConfig() *Config {
return &Config{
Bootstrap: false,
BootstrapExpect: 0,
Server: false,
Datacenter: consul.DefaultDC,
Domain: "consul.",
LogLevel: "INFO",
ClientAddr: "127.0.0.1",
BindAddr: "0.0.0.0",
Ports: PortConfig{
DNS: 8600,
HTTP: 8500,
RPC: 8400,
SerfLan: consul.DefaultLANSerfPort,
SerfWan: consul.DefaultWANSerfPort,
Server: 8300,
},
DNSConfig: DNSConfig{
MaxStale: 5 * time.Second,
},
SyslogFacility: "LOCAL0",
Protocol: consul.ProtocolVersionMax,
CheckUpdateInterval: 5 * time.Minute,
AEInterval: time.Minute,
}
}
// EncryptBytes returns the encryption key configured.
func (c *Config) EncryptBytes() ([]byte, error) {
return base64.StdEncoding.DecodeString(c.EncryptKey)
}
// ClientListener is used to format a listener for a
// port on a ClientAddr
func (c *Config) ClientListener(port int) (*net.TCPAddr, error) {
ip := net.ParseIP(c.ClientAddr)
if ip == nil {
return nil, fmt.Errorf("Failed to parse IP: %v", c.ClientAddr)
}
return &net.TCPAddr{IP: ip, Port: port}, nil
}
// DecodeConfig reads the configuration from the given reader in JSON
// format and decodes it into a proper Config structure.
func DecodeConfig(r io.Reader) (*Config, error) {
var raw interface{}
var result Config
dec := json.NewDecoder(r)
if err := dec.Decode(&raw); err != nil {
return nil, err
}
// Check the result type
if obj, ok := raw.(map[string]interface{}); ok {
// Check for a "service" or "check" key, meaning
// this is actually a definition entry
if sub, ok := obj["service"]; ok {
service, err := DecodeServiceDefinition(sub)
result.Services = append(result.Services, service)
return &result, err
} else if sub, ok := obj["check"]; ok {
check, err := DecodeCheckDefinition(sub)
result.Checks = append(result.Checks, check)
return &result, err
}
}
// Decode
var md mapstructure.Metadata
msdec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
Metadata: &md,
Result: &result,
})
if err != nil {
return nil, err
}
if err := msdec.Decode(raw); err != nil {
return nil, err
}
// Handle time conversions
if raw := result.DNSConfig.NodeTTLRaw; raw != "" {
dur, err := time.ParseDuration(raw)
if err != nil {
return nil, fmt.Errorf("NodeTTL invalid: %v", err)
}
result.DNSConfig.NodeTTL = dur
}
if raw := result.DNSConfig.MaxStaleRaw; raw != "" {
dur, err := time.ParseDuration(raw)
if err != nil {
return nil, fmt.Errorf("MaxStale invalid: %v", err)
}
result.DNSConfig.MaxStale = dur
}
if len(result.DNSConfig.ServiceTTLRaw) != 0 {
if result.DNSConfig.ServiceTTL == nil {
result.DNSConfig.ServiceTTL = make(map[string]time.Duration)
}
for service, raw := range result.DNSConfig.ServiceTTLRaw {
dur, err := time.ParseDuration(raw)
if err != nil {
return nil, fmt.Errorf("ServiceTTL %s invalid: %v", service, err)
}
result.DNSConfig.ServiceTTL[service] = dur
}
}
if raw := result.CheckUpdateIntervalRaw; raw != "" {
dur, err := time.ParseDuration(raw)
if err != nil {
return nil, fmt.Errorf("CheckUpdateInterval invalid: %v", err)
}
result.CheckUpdateInterval = dur
}
return &result, nil
}
// DecodeServiceDefinition is used to decode a service definition
func DecodeServiceDefinition(raw interface{}) (*ServiceDefinition, error) {
var sub interface{}
rawMap, ok := raw.(map[string]interface{})
if !ok {
goto AFTER_FIX
}
// If no 'tags', handle the deprecated 'tag' value.
if _, ok := rawMap["tags"]; !ok {
if tag, ok := rawMap["tag"]; ok {
rawMap["tags"] = []interface{}{tag}
}
}
sub, ok = rawMap["check"]
if !ok {
goto AFTER_FIX
}
if err := FixupCheckType(sub); err != nil {
return nil, err
}
AFTER_FIX:
var md mapstructure.Metadata
var result ServiceDefinition
msdec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
Metadata: &md,
Result: &result,
})
if err != nil {
return nil, err
}
if err := msdec.Decode(raw); err != nil {
return nil, err
}
return &result, nil
}
func FixupCheckType(raw interface{}) error {
// Handle decoding of time durations
rawMap, ok := raw.(map[string]interface{})
if !ok {
return nil
}
var ttlKey string
for k, _ := range rawMap {
if strings.ToLower(k) == "ttl" {
ttlKey = k
}
}
var intervalKey string
for k, _ := range rawMap {
if strings.ToLower(k) == "interval" {
intervalKey = k
}
}
if ttl, ok := rawMap[ttlKey]; ok {
ttlS, ok := ttl.(string)
if ok {
if dur, err := time.ParseDuration(ttlS); err != nil {
return err
} else {
rawMap[ttlKey] = dur
}
}
}
if interval, ok := rawMap[intervalKey]; ok {
intervalS, ok := interval.(string)
if ok {
if dur, err := time.ParseDuration(intervalS); err != nil {
return err
} else {
rawMap[intervalKey] = dur
}
}
}
return nil
}
// DecodeCheckDefinition is used to decode a check definition
func DecodeCheckDefinition(raw interface{}) (*CheckDefinition, error) {
if err := FixupCheckType(raw); err != nil {
return nil, err
}
var md mapstructure.Metadata
var result CheckDefinition
msdec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
Metadata: &md,
Result: &result,
})
if err != nil {
return nil, err
}
if err := msdec.Decode(raw); err != nil {
return nil, err
}
return &result, nil
}
// MergeConfig merges two configurations together to make a single new
// configuration.
func MergeConfig(a, b *Config) *Config {
var result Config = *a
// Copy the strings if they're set
if b.Bootstrap {
result.Bootstrap = true
}
if b.BootstrapExpect != 0 {
result.BootstrapExpect = b.BootstrapExpect
}
if b.Datacenter != "" {
result.Datacenter = b.Datacenter
}
if b.DataDir != "" {
result.DataDir = b.DataDir
}
if b.DNSRecursor != "" {
result.DNSRecursor = b.DNSRecursor
}
if b.Domain != "" {
result.Domain = b.Domain
}
if b.EncryptKey != "" {
result.EncryptKey = b.EncryptKey
}
if b.LogLevel != "" {
result.LogLevel = b.LogLevel
}
if b.Protocol > 0 {
result.Protocol = b.Protocol
}
if b.NodeName != "" {
result.NodeName = b.NodeName
}
if b.ClientAddr != "" {
result.ClientAddr = b.ClientAddr
}
if b.BindAddr != "" {
result.BindAddr = b.BindAddr
}
if b.AdvertiseAddr != "" {
result.AdvertiseAddr = b.AdvertiseAddr
}
if b.Server == true {
result.Server = b.Server
}
if b.LeaveOnTerm == true {
result.LeaveOnTerm = true
}
if b.SkipLeaveOnInt == true {
result.SkipLeaveOnInt = true
}
if b.StatsiteAddr != "" {
result.StatsiteAddr = b.StatsiteAddr
}
if b.EnableDebug {
result.EnableDebug = true
}
if b.VerifyIncoming {
result.VerifyIncoming = true
}
if b.VerifyOutgoing {
result.VerifyOutgoing = true
}
if b.CAFile != "" {
result.CAFile = b.CAFile
}
if b.CertFile != "" {
result.CertFile = b.CertFile
}
if b.KeyFile != "" {
result.KeyFile = b.KeyFile
}
if b.ServerName != "" {
result.ServerName = b.ServerName
}
if b.Checks != nil {
result.Checks = append(result.Checks, b.Checks...)
}
if b.Services != nil {
result.Services = append(result.Services, b.Services...)
}
if b.Ports.DNS != 0 {
result.Ports.DNS = b.Ports.DNS
}
if b.Ports.HTTP != 0 {
result.Ports.HTTP = b.Ports.HTTP
}
if b.Ports.RPC != 0 {
result.Ports.RPC = b.Ports.RPC
}
if b.Ports.SerfLan != 0 {
result.Ports.SerfLan = b.Ports.SerfLan
}
if b.Ports.SerfWan != 0 {
result.Ports.SerfWan = b.Ports.SerfWan
}
if b.Ports.Server != 0 {
result.Ports.Server = b.Ports.Server
}
if b.UiDir != "" {
result.UiDir = b.UiDir
}
if b.PidFile != "" {
result.PidFile = b.PidFile
}
if b.EnableSyslog {
result.EnableSyslog = true
}
if b.RejoinAfterLeave {
result.RejoinAfterLeave = true
}
if b.DNSConfig.NodeTTL != 0 {
result.DNSConfig.NodeTTL = b.DNSConfig.NodeTTL
}
if len(b.DNSConfig.ServiceTTL) != 0 {
if result.DNSConfig.ServiceTTL == nil {
result.DNSConfig.ServiceTTL = make(map[string]time.Duration)
}
for service, dur := range b.DNSConfig.ServiceTTL {
result.DNSConfig.ServiceTTL[service] = dur
}
}
if b.DNSConfig.AllowStale {
result.DNSConfig.AllowStale = true
}
if b.DNSConfig.MaxStale != 0 {
result.DNSConfig.MaxStale = b.DNSConfig.MaxStale
}
if b.CheckUpdateIntervalRaw != "" || b.CheckUpdateInterval != 0 {
result.CheckUpdateInterval = b.CheckUpdateInterval
}
if b.SyslogFacility != "" {
result.SyslogFacility = b.SyslogFacility
}
// Copy the start join addresses
result.StartJoin = make([]string, 0, len(a.StartJoin)+len(b.StartJoin))
result.StartJoin = append(result.StartJoin, a.StartJoin...)
result.StartJoin = append(result.StartJoin, b.StartJoin...)
return &result
}
// ReadConfigPaths reads the paths in the given order to load configurations.
// The paths can be to files or directories. If the path is a directory,
// we read one directory deep and read any files ending in ".json" as
// configuration files.
func ReadConfigPaths(paths []string) (*Config, error) {
result := new(Config)
for _, path := range paths {
f, err := os.Open(path)
if err != nil {
return nil, fmt.Errorf("Error reading '%s': %s", path, err)
}
fi, err := f.Stat()
if err != nil {
f.Close()
return nil, fmt.Errorf("Error reading '%s': %s", path, err)
}
if !fi.IsDir() {
config, err := DecodeConfig(f)
f.Close()
if err != nil {
return nil, fmt.Errorf("Error decoding '%s': %s", path, err)
}
result = MergeConfig(result, config)
continue
}
contents, err := f.Readdir(-1)
f.Close()
if err != nil {
return nil, fmt.Errorf("Error reading '%s': %s", path, err)
}
// Sort the contents, ensures lexical order
sort.Sort(dirEnts(contents))
for _, fi := range contents {
// Don't recursively read contents
if fi.IsDir() {
continue
}
// If it isn't a JSON file, ignore it
if !strings.HasSuffix(fi.Name(), ".json") {
continue
}
subpath := filepath.Join(path, fi.Name())
f, err := os.Open(subpath)
if err != nil {
return nil, fmt.Errorf("Error reading '%s': %s", subpath, err)
}
config, err := DecodeConfig(f)
f.Close()
if err != nil {
return nil, fmt.Errorf("Error decoding '%s': %s", subpath, err)
}
result = MergeConfig(result, config)
}
}
return result, nil
}
// Implement the sort interface for dirEnts
func (d dirEnts) Len() int {
return len(d)
}
func (d dirEnts) Less(i, j int) bool {
return d[i].Name() < d[j].Name()
}
func (d dirEnts) Swap(i, j int) {
d[i], d[j] = d[j], d[i]
}