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tendermint/config/config.go

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package config
import (
"encoding/hex"
"errors"
"fmt"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"time"
tmjson "github.com/tendermint/tendermint/libs/json"
"github.com/tendermint/tendermint/libs/log"
tmos "github.com/tendermint/tendermint/libs/os"
"github.com/tendermint/tendermint/types"
)
const (
// FuzzModeDrop is a mode in which we randomly drop reads/writes, connections or sleep
FuzzModeDrop = iota
// FuzzModeDelay is a mode in which we randomly sleep
FuzzModeDelay
// DefaultLogLevel defines a default log level as INFO.
DefaultLogLevel = "info"
ModeFull = "full"
ModeValidator = "validator"
ModeSeed = "seed"
BlockSyncV0 = "v0"
BlockSyncV2 = "v2"
MempoolV0 = "v0"
MempoolV1 = "v1"
)
// NOTE: Most of the structs & relevant comments + the
// default configuration options were used to manually
// generate the config.toml. Please reflect any changes
// made here in the defaultConfigTemplate constant in
// config/toml.go
// NOTE: libs/cli must know to look in the config dir!
var (
DefaultTendermintDir = ".tendermint"
defaultConfigDir = "config"
defaultDataDir = "data"
defaultConfigFileName = "config.toml"
defaultGenesisJSONName = "genesis.json"
defaultMode = ModeFull
defaultPrivValKeyName = "priv_validator_key.json"
defaultPrivValStateName = "priv_validator_state.json"
defaultNodeKeyName = "node_key.json"
defaultAddrBookName = "addrbook.json"
defaultConfigFilePath = filepath.Join(defaultConfigDir, defaultConfigFileName)
defaultGenesisJSONPath = filepath.Join(defaultConfigDir, defaultGenesisJSONName)
defaultPrivValKeyPath = filepath.Join(defaultConfigDir, defaultPrivValKeyName)
defaultPrivValStatePath = filepath.Join(defaultDataDir, defaultPrivValStateName)
defaultNodeKeyPath = filepath.Join(defaultConfigDir, defaultNodeKeyName)
defaultAddrBookPath = filepath.Join(defaultConfigDir, defaultAddrBookName)
minSubscriptionBufferSize = 100
defaultSubscriptionBufferSize = 200
)
// Config defines the top level configuration for a Tendermint node
type Config struct {
// Top level options use an anonymous struct
BaseConfig `mapstructure:",squash"`
// Options for services
RPC *RPCConfig `mapstructure:"rpc"`
P2P *P2PConfig `mapstructure:"p2p"`
Mempool *MempoolConfig `mapstructure:"mempool"`
StateSync *StateSyncConfig `mapstructure:"statesync"`
BlockSync *BlockSyncConfig `mapstructure:"blocksync"`
Consensus *ConsensusConfig `mapstructure:"consensus"`
TxIndex *TxIndexConfig `mapstructure:"tx-index"`
Instrumentation *InstrumentationConfig `mapstructure:"instrumentation"`
PrivValidator *PrivValidatorConfig `mapstructure:"priv-validator"`
}
// DefaultConfig returns a default configuration for a Tendermint node
func DefaultConfig() *Config {
return &Config{
BaseConfig: DefaultBaseConfig(),
RPC: DefaultRPCConfig(),
P2P: DefaultP2PConfig(),
Mempool: DefaultMempoolConfig(),
StateSync: DefaultStateSyncConfig(),
BlockSync: DefaultBlockSyncConfig(),
Consensus: DefaultConsensusConfig(),
TxIndex: DefaultTxIndexConfig(),
Instrumentation: DefaultInstrumentationConfig(),
PrivValidator: DefaultPrivValidatorConfig(),
}
}
// DefaultValidatorConfig returns default config with mode as validator
func DefaultValidatorConfig() *Config {
cfg := DefaultConfig()
cfg.Mode = ModeValidator
return cfg
}
// TestConfig returns a configuration that can be used for testing
func TestConfig() *Config {
return &Config{
BaseConfig: TestBaseConfig(),
RPC: TestRPCConfig(),
P2P: TestP2PConfig(),
Mempool: TestMempoolConfig(),
StateSync: TestStateSyncConfig(),
BlockSync: TestBlockSyncConfig(),
Consensus: TestConsensusConfig(),
TxIndex: TestTxIndexConfig(),
Instrumentation: TestInstrumentationConfig(),
PrivValidator: DefaultPrivValidatorConfig(),
}
}
// SetRoot sets the RootDir for all Config structs
func (cfg *Config) SetRoot(root string) *Config {
cfg.BaseConfig.RootDir = root
cfg.RPC.RootDir = root
cfg.P2P.RootDir = root
cfg.Mempool.RootDir = root
cfg.Consensus.RootDir = root
cfg.PrivValidator.RootDir = root
return cfg
}
// ValidateBasic performs basic validation (checking param bounds, etc.) and
// returns an error if any check fails.
func (cfg *Config) ValidateBasic() error {
if err := cfg.BaseConfig.ValidateBasic(); err != nil {
return err
}
if err := cfg.RPC.ValidateBasic(); err != nil {
return fmt.Errorf("error in [rpc] section: %w", err)
}
if err := cfg.P2P.ValidateBasic(); err != nil {
return fmt.Errorf("error in [p2p] section: %w", err)
}
if err := cfg.Mempool.ValidateBasic(); err != nil {
return fmt.Errorf("error in [mempool] section: %w", err)
}
if err := cfg.StateSync.ValidateBasic(); err != nil {
return fmt.Errorf("error in [statesync] section: %w", err)
}
if err := cfg.BlockSync.ValidateBasic(); err != nil {
return fmt.Errorf("error in [blocksync] section: %w", err)
}
if err := cfg.Consensus.ValidateBasic(); err != nil {
return fmt.Errorf("error in [consensus] section: %w", err)
}
if err := cfg.Instrumentation.ValidateBasic(); err != nil {
return fmt.Errorf("error in [instrumentation] section: %w", err)
}
return nil
}
//-----------------------------------------------------------------------------
// BaseConfig
// BaseConfig defines the base configuration for a Tendermint node
type BaseConfig struct { //nolint: maligned
// chainID is unexposed and immutable but here for convenience
chainID string
// The root directory for all data.
// This should be set in viper so it can unmarshal into this struct
RootDir string `mapstructure:"home"`
// TCP or UNIX socket address of the ABCI application,
// or the name of an ABCI application compiled in with the Tendermint binary
ProxyApp string `mapstructure:"proxy-app"`
// A custom human readable name for this node
Moniker string `mapstructure:"moniker"`
// Mode of Node: full | validator | seed
// * validator
// - all reactors
// - with priv_validator_key.json, priv_validator_state.json
// * full
// - all reactors
// - No priv_validator_key.json, priv_validator_state.json
// * seed
// - only P2P, PEX Reactor
// - No priv_validator_key.json, priv_validator_state.json
Mode string `mapstructure:"mode"`
// Database backend: goleveldb | cleveldb | boltdb | rocksdb
// * goleveldb (github.com/syndtr/goleveldb - most popular implementation)
// - pure go
// - stable
// * cleveldb (uses levigo wrapper)
// - fast
// - requires gcc
// - use cleveldb build tag (go build -tags cleveldb)
// * boltdb (uses etcd's fork of bolt - github.com/etcd-io/bbolt)
// - EXPERIMENTAL
// - may be faster is some use-cases (random reads - indexer)
// - use boltdb build tag (go build -tags boltdb)
// * rocksdb (uses github.com/tecbot/gorocksdb)
// - EXPERIMENTAL
// - requires gcc
// - use rocksdb build tag (go build -tags rocksdb)
// * badgerdb (uses github.com/dgraph-io/badger)
// - EXPERIMENTAL
// - use badgerdb build tag (go build -tags badgerdb)
DBBackend string `mapstructure:"db-backend"`
// Database directory
DBPath string `mapstructure:"db-dir"`
// Output level for logging
LogLevel string `mapstructure:"log-level"`
// Output format: 'plain' (colored text) or 'json'
LogFormat string `mapstructure:"log-format"`
// Path to the JSON file containing the initial validator set and other meta data
Genesis string `mapstructure:"genesis-file"`
// A JSON file containing the private key to use for p2p authenticated encryption
NodeKey string `mapstructure:"node-key-file"`
// Mechanism to connect to the ABCI application: socket | grpc
ABCI string `mapstructure:"abci"`
// If true, query the ABCI app on connecting to a new peer
// so the app can decide if we should keep the connection or not
FilterPeers bool `mapstructure:"filter-peers"` // false
Other map[string]interface{} `mapstructure:",remain"`
}
// DefaultBaseConfig returns a default base configuration for a Tendermint node
func DefaultBaseConfig() BaseConfig {
return BaseConfig{
Genesis: defaultGenesisJSONPath,
NodeKey: defaultNodeKeyPath,
Mode: defaultMode,
Moniker: defaultMoniker,
ProxyApp: "tcp://127.0.0.1:26658",
ABCI: "socket",
LogLevel: DefaultLogLevel,
LogFormat: log.LogFormatPlain,
FilterPeers: false,
DBBackend: "goleveldb",
DBPath: "data",
}
}
// TestBaseConfig returns a base configuration for testing a Tendermint node
func TestBaseConfig() BaseConfig {
cfg := DefaultBaseConfig()
cfg.chainID = "tendermint_test"
cfg.Mode = ModeValidator
cfg.ProxyApp = "kvstore"
cfg.DBBackend = "memdb"
return cfg
}
func (cfg BaseConfig) ChainID() string {
return cfg.chainID
}
// GenesisFile returns the full path to the genesis.json file
func (cfg BaseConfig) GenesisFile() string {
return rootify(cfg.Genesis, cfg.RootDir)
}
// NodeKeyFile returns the full path to the node_key.json file
func (cfg BaseConfig) NodeKeyFile() string {
return rootify(cfg.NodeKey, cfg.RootDir)
}
// LoadNodeKey loads NodeKey located in filePath.
func (cfg BaseConfig) LoadNodeKeyID() (types.NodeID, error) {
jsonBytes, err := ioutil.ReadFile(cfg.NodeKeyFile())
if err != nil {
return "", err
}
nodeKey := types.NodeKey{}
err = tmjson.Unmarshal(jsonBytes, &nodeKey)
if err != nil {
return "", err
}
nodeKey.ID = types.NodeIDFromPubKey(nodeKey.PubKey())
return nodeKey.ID, nil
}
// LoadOrGenNodeKey attempts to load the NodeKey from the given filePath. If
// the file does not exist, it generates and saves a new NodeKey.
func (cfg BaseConfig) LoadOrGenNodeKeyID() (types.NodeID, error) {
if tmos.FileExists(cfg.NodeKeyFile()) {
nodeKey, err := cfg.LoadNodeKeyID()
if err != nil {
return "", err
}
return nodeKey, nil
}
nodeKey := types.GenNodeKey()
if err := nodeKey.SaveAs(cfg.NodeKeyFile()); err != nil {
return "", err
}
return nodeKey.ID, nil
}
// DBDir returns the full path to the database directory
func (cfg BaseConfig) DBDir() string {
return rootify(cfg.DBPath, cfg.RootDir)
}
// ValidateBasic performs basic validation (checking param bounds, etc.) and
// returns an error if any check fails.
func (cfg BaseConfig) ValidateBasic() error {
switch cfg.LogFormat {
case log.LogFormatJSON, log.LogFormatText, log.LogFormatPlain:
default:
return errors.New("unknown log format (must be 'plain', 'text' or 'json')")
}
switch cfg.Mode {
case ModeFull, ModeValidator, ModeSeed:
case "":
return errors.New("no mode has been set")
default:
return fmt.Errorf("unknown mode: %v", cfg.Mode)
}
// TODO (https://github.com/tendermint/tendermint/issues/6908) remove this check after the v0.35 release cycle.
// This check was added to give users an upgrade prompt to use the new
// configuration option in v0.35. In future release cycles they should no longer
// be using this configuration parameter so the check can be removed.
// The cfg.Other field can likely be removed at the same time if it is not referenced
// elsewhere as it was added to service this check.
if fs, ok := cfg.Other["fastsync"]; ok {
if _, ok := fs.(map[string]interface{}); ok {
return fmt.Errorf("a configuration section named 'fastsync' was found in the " +
"configuration file. The 'fastsync' section has been renamed to " +
"'blocksync', please update the 'fastsync' field in your configuration file to 'blocksync'")
}
}
if fs, ok := cfg.Other["fast-sync"]; ok {
if fs != "" {
return fmt.Errorf("a parameter named 'fast-sync' was found in the " +
"configuration file. The parameter to enable or disable quickly syncing with a blockchain" +
"has moved to the [blocksync] section of the configuration file as blocksync.enable. " +
"Please move the 'fast-sync' field in your configuration file to 'blocksync.enable'")
}
}
return nil
}
//-----------------------------------------------------------------------------
// PrivValidatorConfig
// PrivValidatorConfig defines the configuration parameters for running a validator
type PrivValidatorConfig struct {
RootDir string `mapstructure:"home"`
// Path to the JSON file containing the private key to use as a validator in the consensus protocol
Key string `mapstructure:"key-file"`
// Path to the JSON file containing the last sign state of a validator
State string `mapstructure:"state-file"`
// TCP or UNIX socket address for Tendermint to listen on for
// connections from an external PrivValidator process
ListenAddr string `mapstructure:"laddr"`
// Client certificate generated while creating needed files for secure connection.
// If a remote validator address is provided but no certificate, the connection will be insecure
ClientCertificate string `mapstructure:"client-certificate-file"`
// Client key generated while creating certificates for secure connection
ClientKey string `mapstructure:"client-key-file"`
// Path Root Certificate Authority used to sign both client and server certificates
RootCA string `mapstructure:"root-ca-file"`
}
// DefaultBaseConfig returns a default private validator configuration
// for a Tendermint node.
func DefaultPrivValidatorConfig() *PrivValidatorConfig {
return &PrivValidatorConfig{
Key: defaultPrivValKeyPath,
State: defaultPrivValStatePath,
}
}
// ClientKeyFile returns the full path to the priv_validator_key.json file
func (cfg *PrivValidatorConfig) ClientKeyFile() string {
return rootify(cfg.ClientKey, cfg.RootDir)
}
// ClientCertificateFile returns the full path to the priv_validator_key.json file
func (cfg *PrivValidatorConfig) ClientCertificateFile() string {
return rootify(cfg.ClientCertificate, cfg.RootDir)
}
// CertificateAuthorityFile returns the full path to the priv_validator_key.json file
func (cfg *PrivValidatorConfig) RootCAFile() string {
return rootify(cfg.RootCA, cfg.RootDir)
}
// KeyFile returns the full path to the priv_validator_key.json file
func (cfg *PrivValidatorConfig) KeyFile() string {
return rootify(cfg.Key, cfg.RootDir)
}
// StateFile returns the full path to the priv_validator_state.json file
func (cfg *PrivValidatorConfig) StateFile() string {
return rootify(cfg.State, cfg.RootDir)
}
func (cfg *PrivValidatorConfig) AreSecurityOptionsPresent() bool {
switch {
case cfg.RootCA == "":
return false
case cfg.ClientKey == "":
return false
case cfg.ClientCertificate == "":
return false
default:
return true
}
}
//-----------------------------------------------------------------------------
// RPCConfig
// RPCConfig defines the configuration options for the Tendermint RPC server
type RPCConfig struct {
RootDir string `mapstructure:"home"`
// TCP or UNIX socket address for the RPC server to listen on
ListenAddress string `mapstructure:"laddr"`
// A list of origins a cross-domain request can be executed from.
// If the special '*' value is present in the list, all origins will be allowed.
// An origin may contain a wildcard (*) to replace 0 or more characters (i.e.: http://*.domain.com).
// Only one wildcard can be used per origin.
CORSAllowedOrigins []string `mapstructure:"cors-allowed-origins"`
// A list of methods the client is allowed to use with cross-domain requests.
CORSAllowedMethods []string `mapstructure:"cors-allowed-methods"`
// A list of non simple headers the client is allowed to use with cross-domain requests.
CORSAllowedHeaders []string `mapstructure:"cors-allowed-headers"`
// TCP or UNIX socket address for the gRPC server to listen on
// NOTE: This server only supports /broadcast_tx_commit
// Deprecated: gRPC in the RPC layer of Tendermint will be removed in 0.36.
GRPCListenAddress string `mapstructure:"grpc-laddr"`
// Maximum number of simultaneous connections.
// Does not include RPC (HTTP&WebSocket) connections. See max-open-connections
// If you want to accept a larger number than the default, make sure
// you increase your OS limits.
// 0 - unlimited.
// Deprecated: gRPC in the RPC layer of Tendermint will be removed in 0.36.
GRPCMaxOpenConnections int `mapstructure:"grpc-max-open-connections"`
// Activate unsafe RPC commands like /dial-persistent-peers and /unsafe-flush-mempool
Unsafe bool `mapstructure:"unsafe"`
// Maximum number of simultaneous connections (including WebSocket).
// Does not include gRPC connections. See grpc-max-open-connections
// If you want to accept a larger number than the default, make sure
// you increase your OS limits.
// 0 - unlimited.
// Should be < {ulimit -Sn} - {MaxNumInboundPeers} - {MaxNumOutboundPeers} - {N of wal, db and other open files}
// 1024 - 40 - 10 - 50 = 924 = ~900
MaxOpenConnections int `mapstructure:"max-open-connections"`
// Maximum number of unique clientIDs that can /subscribe
// If you're using /broadcast_tx_commit, set to the estimated maximum number
// of broadcast_tx_commit calls per block.
MaxSubscriptionClients int `mapstructure:"max-subscription-clients"`
// Maximum number of unique queries a given client can /subscribe to
// If you're using GRPC (or Local RPC client) and /broadcast_tx_commit, set
// to the estimated maximum number of broadcast_tx_commit calls per block.
MaxSubscriptionsPerClient int `mapstructure:"max-subscriptions-per-client"`
// The number of events that can be buffered per subscription before
// returning `ErrOutOfCapacity`.
SubscriptionBufferSize int `mapstructure:"experimental-subscription-buffer-size"`
// The maximum number of responses that can be buffered per WebSocket
// client. If clients cannot read from the WebSocket endpoint fast enough,
// they will be disconnected, so increasing this parameter may reduce the
// chances of them being disconnected (but will cause the node to use more
// memory).
//
// Must be at least the same as `SubscriptionBufferSize`, otherwise
// connections may be dropped unnecessarily.
WebSocketWriteBufferSize int `mapstructure:"experimental-websocket-write-buffer-size"`
// If a WebSocket client cannot read fast enough, at present we may
// silently drop events instead of generating an error or disconnecting the
// client.
//
// Enabling this parameter will cause the WebSocket connection to be closed
// instead if it cannot read fast enough, allowing for greater
// predictability in subscription behavior.
CloseOnSlowClient bool `mapstructure:"experimental-close-on-slow-client"`
// How long to wait for a tx to be committed during /broadcast_tx_commit
// WARNING: Using a value larger than 10s will result in increasing the
// global HTTP write timeout, which applies to all connections and endpoints.
// See https://github.com/tendermint/tendermint/issues/3435
TimeoutBroadcastTxCommit time.Duration `mapstructure:"timeout-broadcast-tx-commit"`
// Maximum size of request body, in bytes
MaxBodyBytes int64 `mapstructure:"max-body-bytes"`
// Maximum size of request header, in bytes
MaxHeaderBytes int `mapstructure:"max-header-bytes"`
// The path to a file containing certificate that is used to create the HTTPS server.
// Might be either absolute path or path related to Tendermint's config directory.
//
// If the certificate is signed by a certificate authority,
// the certFile should be the concatenation of the server's certificate, any intermediates,
// and the CA's certificate.
//
// NOTE: both tls-cert-file and tls-key-file must be present for Tendermint to create HTTPS server.
// Otherwise, HTTP server is run.
TLSCertFile string `mapstructure:"tls-cert-file"`
// The path to a file containing matching private key that is used to create the HTTPS server.
// Might be either absolute path or path related to tendermint's config directory.
//
// NOTE: both tls-cert-file and tls-key-file must be present for Tendermint to create HTTPS server.
// Otherwise, HTTP server is run.
TLSKeyFile string `mapstructure:"tls-key-file"`
// pprof listen address (https://golang.org/pkg/net/http/pprof)
PprofListenAddress string `mapstructure:"pprof-laddr"`
}
// DefaultRPCConfig returns a default configuration for the RPC server
func DefaultRPCConfig() *RPCConfig {
return &RPCConfig{
ListenAddress: "tcp://127.0.0.1:26657",
CORSAllowedOrigins: []string{},
CORSAllowedMethods: []string{http.MethodHead, http.MethodGet, http.MethodPost},
CORSAllowedHeaders: []string{"Origin", "Accept", "Content-Type", "X-Requested-With", "X-Server-Time"},
GRPCListenAddress: "",
GRPCMaxOpenConnections: 900,
Unsafe: false,
MaxOpenConnections: 900,
MaxSubscriptionClients: 100,
MaxSubscriptionsPerClient: 5,
SubscriptionBufferSize: defaultSubscriptionBufferSize,
TimeoutBroadcastTxCommit: 10 * time.Second,
WebSocketWriteBufferSize: defaultSubscriptionBufferSize,
MaxBodyBytes: int64(1000000), // 1MB
MaxHeaderBytes: 1 << 20, // same as the net/http default
TLSCertFile: "",
TLSKeyFile: "",
}
}
// TestRPCConfig returns a configuration for testing the RPC server
func TestRPCConfig() *RPCConfig {
cfg := DefaultRPCConfig()
cfg.ListenAddress = "tcp://127.0.0.1:36657"
cfg.GRPCListenAddress = "tcp://127.0.0.1:36658"
cfg.Unsafe = true
return cfg
}
// ValidateBasic performs basic validation (checking param bounds, etc.) and
// returns an error if any check fails.
func (cfg *RPCConfig) ValidateBasic() error {
if cfg.GRPCMaxOpenConnections < 0 {
return errors.New("grpc-max-open-connections can't be negative")
}
if cfg.MaxOpenConnections < 0 {
return errors.New("max-open-connections can't be negative")
}
if cfg.MaxSubscriptionClients < 0 {
return errors.New("max-subscription-clients can't be negative")
}
if cfg.MaxSubscriptionsPerClient < 0 {
return errors.New("max-subscriptions-per-client can't be negative")
}
if cfg.SubscriptionBufferSize < minSubscriptionBufferSize {
return fmt.Errorf(
"experimental-subscription-buffer-size must be >= %d",
minSubscriptionBufferSize,
)
}
if cfg.WebSocketWriteBufferSize < cfg.SubscriptionBufferSize {
return fmt.Errorf(
"experimental-websocket-write-buffer-size must be >= experimental-subscription-buffer-size (%d)",
cfg.SubscriptionBufferSize,
)
}
if cfg.TimeoutBroadcastTxCommit < 0 {
return errors.New("timeout-broadcast-tx-commit can't be negative")
}
if cfg.MaxBodyBytes < 0 {
return errors.New("max-body-bytes can't be negative")
}
if cfg.MaxHeaderBytes < 0 {
return errors.New("max-header-bytes can't be negative")
}
return nil
}
// IsCorsEnabled returns true if cross-origin resource sharing is enabled.
func (cfg *RPCConfig) IsCorsEnabled() bool {
return len(cfg.CORSAllowedOrigins) != 0
}
func (cfg RPCConfig) KeyFile() string {
path := cfg.TLSKeyFile
if filepath.IsAbs(path) {
return path
}
return rootify(filepath.Join(defaultConfigDir, path), cfg.RootDir)
}
func (cfg RPCConfig) CertFile() string {
path := cfg.TLSCertFile
if filepath.IsAbs(path) {
return path
}
return rootify(filepath.Join(defaultConfigDir, path), cfg.RootDir)
}
func (cfg RPCConfig) IsTLSEnabled() bool {
return cfg.TLSCertFile != "" && cfg.TLSKeyFile != ""
}
//-----------------------------------------------------------------------------
// P2PConfig
// P2PConfig defines the configuration options for the Tendermint peer-to-peer networking layer
type P2PConfig struct { //nolint: maligned
RootDir string `mapstructure:"home"`
// Address to listen for incoming connections
ListenAddress string `mapstructure:"laddr"`
// Address to advertise to peers for them to dial
ExternalAddress string `mapstructure:"external-address"`
// Comma separated list of seed nodes to connect to
// We only use these if we can’t connect to peers in the addrbook
//
// Deprecated: This value is not used by the new PEX reactor. Use
// BootstrapPeers instead.
//
// TODO(#5670): Remove once the p2p refactor is complete.
Seeds string `mapstructure:"seeds"`
// Comma separated list of peers to be added to the peer store
// on startup. Either BootstrapPeers or PersistentPeers are
// needed for peer discovery
BootstrapPeers string `mapstructure:"bootstrap-peers"`
// Comma separated list of nodes to keep persistent connections to
PersistentPeers string `mapstructure:"persistent-peers"`
// UPNP port forwarding
UPNP bool `mapstructure:"upnp"`
// Path to address book
AddrBook string `mapstructure:"addr-book-file"`
// Set true for strict address routability rules
// Set false for private or local networks
AddrBookStrict bool `mapstructure:"addr-book-strict"`
// Maximum number of inbound peers
//
// TODO: Remove once p2p refactor is complete in favor of MaxConnections.
// ref: https://github.com/tendermint/tendermint/issues/5670
MaxNumInboundPeers int `mapstructure:"max-num-inbound-peers"`
// Maximum number of outbound peers to connect to, excluding persistent peers.
//
// TODO: Remove once p2p refactor is complete in favor of MaxConnections.
// ref: https://github.com/tendermint/tendermint/issues/5670
MaxNumOutboundPeers int `mapstructure:"max-num-outbound-peers"`
// MaxConnections defines the maximum number of connected peers (inbound and
// outbound).
MaxConnections uint16 `mapstructure:"max-connections"`
// MaxIncomingConnectionAttempts rate limits the number of incoming connection
// attempts per IP address.
MaxIncomingConnectionAttempts uint `mapstructure:"max-incoming-connection-attempts"`
// List of node IDs, to which a connection will be (re)established ignoring any existing limits
UnconditionalPeerIDs string `mapstructure:"unconditional-peer-ids"`
// Maximum pause when redialing a persistent peer (if zero, exponential backoff is used)
PersistentPeersMaxDialPeriod time.Duration `mapstructure:"persistent-peers-max-dial-period"`
// Time to wait before flushing messages out on the connection
FlushThrottleTimeout time.Duration `mapstructure:"flush-throttle-timeout"`
// Maximum size of a message packet payload, in bytes
MaxPacketMsgPayloadSize int `mapstructure:"max-packet-msg-payload-size"`
// Rate at which packets can be sent, in bytes/second
SendRate int64 `mapstructure:"send-rate"`
// Rate at which packets can be received, in bytes/second
RecvRate int64 `mapstructure:"recv-rate"`
// Set true to enable the peer-exchange reactor
PexReactor bool `mapstructure:"pex"`
// Comma separated list of peer IDs to keep private (will not be gossiped to
// other peers)
PrivatePeerIDs string `mapstructure:"private-peer-ids"`
// Toggle to disable guard against peers connecting from the same ip.
AllowDuplicateIP bool `mapstructure:"allow-duplicate-ip"`
// Peer connection configuration.
HandshakeTimeout time.Duration `mapstructure:"handshake-timeout"`
DialTimeout time.Duration `mapstructure:"dial-timeout"`
// Testing params.
// Force dial to fail
TestDialFail bool `mapstructure:"test-dial-fail"`
// UseLegacy enables the "legacy" P2P implementation and
// disables the newer default implementation. This flag will
// be removed in a future release.
UseLegacy bool `mapstructure:"use-legacy"`
// Makes it possible to configure which queue backend the p2p
// layer uses. Options are: "fifo", "priority" and "wdrr",
// with the default being "priority".
QueueType string `mapstructure:"queue-type"`
}
// DefaultP2PConfig returns a default configuration for the peer-to-peer layer
func DefaultP2PConfig() *P2PConfig {
return &P2PConfig{
ListenAddress: "tcp://0.0.0.0:26656",
ExternalAddress: "",
UPNP: false,
AddrBook: defaultAddrBookPath,
AddrBookStrict: true,
MaxNumInboundPeers: 40,
MaxNumOutboundPeers: 10,
MaxConnections: 64,
MaxIncomingConnectionAttempts: 100,
PersistentPeersMaxDialPeriod: 0 * time.Second,
FlushThrottleTimeout: 100 * time.Millisecond,
// The MTU (Maximum Transmission Unit) for Ethernet is 1500 bytes.
// The IP header and the TCP header take up 20 bytes each at least (unless
// optional header fields are used) and thus the max for (non-Jumbo frame)
// Ethernet is 1500 - 20 -20 = 1460
// Source: https://stackoverflow.com/a/3074427/820520
MaxPacketMsgPayloadSize: 1400,
SendRate: 5120000, // 5 mB/s
RecvRate: 5120000, // 5 mB/s
PexReactor: true,
AllowDuplicateIP: false,
HandshakeTimeout: 20 * time.Second,
DialTimeout: 3 * time.Second,
TestDialFail: false,
QueueType: "priority",
UseLegacy: false,
}
}
// TestP2PConfig returns a configuration for testing the peer-to-peer layer
func TestP2PConfig() *P2PConfig {
cfg := DefaultP2PConfig()
cfg.ListenAddress = "tcp://127.0.0.1:36656"
cfg.FlushThrottleTimeout = 10 * time.Millisecond
cfg.AllowDuplicateIP = true
return cfg
}
// AddrBookFile returns the full path to the address book
func (cfg *P2PConfig) AddrBookFile() string {
return rootify(cfg.AddrBook, cfg.RootDir)
}
// ValidateBasic performs basic validation (checking param bounds, etc.) and
// returns an error if any check fails.
func (cfg *P2PConfig) ValidateBasic() error {
if cfg.MaxNumInboundPeers < 0 {
return errors.New("max-num-inbound-peers can't be negative")
}
if cfg.MaxNumOutboundPeers < 0 {
return errors.New("max-num-outbound-peers can't be negative")
}
if cfg.FlushThrottleTimeout < 0 {
return errors.New("flush-throttle-timeout can't be negative")
}
if cfg.PersistentPeersMaxDialPeriod < 0 {
return errors.New("persistent-peers-max-dial-period can't be negative")
}
if cfg.MaxPacketMsgPayloadSize < 0 {
return errors.New("max-packet-msg-payload-size can't be negative")
}
if cfg.SendRate < 0 {
return errors.New("send-rate can't be negative")
}
if cfg.RecvRate < 0 {
return errors.New("recv-rate can't be negative")
}
return nil
}
//-----------------------------------------------------------------------------
// MempoolConfig
// MempoolConfig defines the configuration options for the Tendermint mempool.
type MempoolConfig struct {
Version string `mapstructure:"version"`
RootDir string `mapstructure:"home"`
Recheck bool `mapstructure:"recheck"`
Broadcast bool `mapstructure:"broadcast"`
// Maximum number of transactions in the mempool
Size int `mapstructure:"size"`
// Limit the total size of all txs in the mempool.
// This only accounts for raw transactions (e.g. given 1MB transactions and
// max-txs-bytes=5MB, mempool will only accept 5 transactions).
MaxTxsBytes int64 `mapstructure:"max-txs-bytes"`
// Size of the cache (used to filter transactions we saw earlier) in transactions
CacheSize int `mapstructure:"cache-size"`
// Do not remove invalid transactions from the cache (default: false)
// Set to true if it's not possible for any invalid transaction to become
// valid again in the future.
KeepInvalidTxsInCache bool `mapstructure:"keep-invalid-txs-in-cache"`
// Maximum size of a single transaction
// NOTE: the max size of a tx transmitted over the network is {max-tx-bytes}.
MaxTxBytes int `mapstructure:"max-tx-bytes"`
// Maximum size of a batch of transactions to send to a peer
// Including space needed by encoding (one varint per transaction).
// XXX: Unused due to https://github.com/tendermint/tendermint/issues/5796
MaxBatchBytes int `mapstructure:"max-batch-bytes"`
// TTLDuration, if non-zero, defines the maximum amount of time a transaction
// can exist for in the mempool.
//
// Note, if TTLNumBlocks is also defined, a transaction will be removed if it
// has existed in the mempool at least TTLNumBlocks number of blocks or if it's
// insertion time into the mempool is beyond TTLDuration.
TTLDuration time.Duration `mapstructure:"ttl-duration"`
// TTLNumBlocks, if non-zero, defines the maximum number of blocks a transaction
// can exist for in the mempool.
//
// Note, if TTLDuration is also defined, a transaction will be removed if it
// has existed in the mempool at least TTLNumBlocks number of blocks or if
// it's insertion time into the mempool is beyond TTLDuration.
TTLNumBlocks int64 `mapstructure:"ttl-num-blocks"`
}
// DefaultMempoolConfig returns a default configuration for the Tendermint mempool.
func DefaultMempoolConfig() *MempoolConfig {
return &MempoolConfig{
Version: MempoolV1,
Recheck: true,
Broadcast: true,
// Each signature verification takes .5ms, Size reduced until we implement
// ABCI Recheck
Size: 5000,
MaxTxsBytes: 1024 * 1024 * 1024, // 1GB
CacheSize: 10000,
MaxTxBytes: 1024 * 1024, // 1MB
TTLDuration: 0 * time.Second,
TTLNumBlocks: 0,
}
}
// TestMempoolConfig returns a configuration for testing the Tendermint mempool
func TestMempoolConfig() *MempoolConfig {
cfg := DefaultMempoolConfig()
cfg.CacheSize = 1000
return cfg
}
// ValidateBasic performs basic validation (checking param bounds, etc.) and
// returns an error if any check fails.
func (cfg *MempoolConfig) ValidateBasic() error {
if cfg.Size < 0 {
return errors.New("size can't be negative")
}
if cfg.MaxTxsBytes < 0 {
return errors.New("max-txs-bytes can't be negative")
}
if cfg.CacheSize < 0 {
return errors.New("cache-size can't be negative")
}
if cfg.MaxTxBytes < 0 {
return errors.New("max-tx-bytes can't be negative")
}
if cfg.TTLDuration < 0 {
return errors.New("ttl-duration can't be negative")
}
if cfg.TTLNumBlocks < 0 {
return errors.New("ttl-num-blocks can't be negative")
}
return nil
}
//-----------------------------------------------------------------------------
// StateSyncConfig
// StateSyncConfig defines the configuration for the Tendermint state sync service
type StateSyncConfig struct {
// State sync rapidly bootstraps a new node by discovering, fetching, and restoring a
// state machine snapshot from peers instead of fetching and replaying historical
// blocks. Requires some peers in the network to take and serve state machine
// snapshots. State sync is not attempted if the node has any local state
// (LastBlockHeight > 0). The node will have a truncated block history, starting from
// the height of the snapshot.
Enable bool `mapstructure:"enable"`
// State sync uses light client verification to verify state. This can be done either
// through the P2P layer or the RPC layer. Set this to true to use the P2P layer. If
// false (default), the RPC layer will be used.
UseP2P bool `mapstructure:"use-p2p"`
// If using RPC, at least two addresses need to be provided. They should be compatible
// with net.Dial, for example: "host.example.com:2125".
RPCServers []string `mapstructure:"rpc-servers"`
// The hash and height of a trusted block. Must be within the trust-period.
TrustHeight int64 `mapstructure:"trust-height"`
TrustHash string `mapstructure:"trust-hash"`
// The trust period should be set so that Tendermint can detect and gossip
// misbehavior before it is considered expired. For chains based on the Cosmos SDK,
// one day less than the unbonding period should suffice.
TrustPeriod time.Duration `mapstructure:"trust-period"`
// Time to spend discovering snapshots before initiating a restore.
DiscoveryTime time.Duration `mapstructure:"discovery-time"`
// Temporary directory for state sync snapshot chunks, defaults to os.TempDir().
// The synchronizer will create a new, randomly named directory within this directory
// and remove it when the sync is complete.
TempDir string `mapstructure:"temp-dir"`
// The timeout duration before re-requesting a chunk, possibly from a different
// peer (default: 15 seconds).
ChunkRequestTimeout time.Duration `mapstructure:"chunk-request-timeout"`
// The number of concurrent chunk and block fetchers to run (default: 4).
Fetchers int32 `mapstructure:"fetchers"`
}
func (cfg *StateSyncConfig) TrustHashBytes() []byte {
// validated in ValidateBasic, so we can safely panic here
bytes, err := hex.DecodeString(cfg.TrustHash)
if err != nil {
panic(err)
}
return bytes
}
// DefaultStateSyncConfig returns a default configuration for the state sync service
func DefaultStateSyncConfig() *StateSyncConfig {
return &StateSyncConfig{
TrustPeriod: 168 * time.Hour,
DiscoveryTime: 15 * time.Second,
ChunkRequestTimeout: 15 * time.Second,
Fetchers: 4,
}
}
// TestStateSyncConfig returns a default configuration for the state sync service
func TestStateSyncConfig() *StateSyncConfig {
return DefaultStateSyncConfig()
}
// ValidateBasic performs basic validation.
func (cfg *StateSyncConfig) ValidateBasic() error {
if !cfg.Enable {
return nil
}
// If we're not using the P2P stack then we need to validate the
// RPCServers
if !cfg.UseP2P {
if len(cfg.RPCServers) < 2 {
return errors.New("at least two rpc-servers must be specified")
}
for _, server := range cfg.RPCServers {
if server == "" {
return errors.New("found empty rpc-servers entry")
}
}
}
if cfg.DiscoveryTime != 0 && cfg.DiscoveryTime < 5*time.Second {
return errors.New("discovery time must be 0s or greater than five seconds")
}
if cfg.TrustPeriod <= 0 {
return errors.New("trusted-period is required")
}
if cfg.TrustHeight <= 0 {
return errors.New("trusted-height is required")
}
if len(cfg.TrustHash) == 0 {
return errors.New("trusted-hash is required")
}
_, err := hex.DecodeString(cfg.TrustHash)
if err != nil {
return fmt.Errorf("invalid trusted-hash: %w", err)
}
if cfg.ChunkRequestTimeout < 5*time.Second {
return errors.New("chunk-request-timeout must be at least 5 seconds")
}
if cfg.Fetchers <= 0 {
return errors.New("fetchers is required")
}
return nil
}
//-----------------------------------------------------------------------------
// BlockSyncConfig (formerly known as FastSync) defines the configuration for the Tendermint block sync service
// If this node is many blocks behind the tip of the chain, BlockSync
// allows them to catchup quickly by downloading blocks in parallel
// and verifying their commits.
type BlockSyncConfig struct {
Enable bool `mapstructure:"enable"`
Version string `mapstructure:"version"`
}
// DefaultBlockSyncConfig returns a default configuration for the block sync service
func DefaultBlockSyncConfig() *BlockSyncConfig {
return &BlockSyncConfig{
Enable: true,
Version: BlockSyncV0,
}
}
// TestBlockSyncConfig returns a default configuration for the block sync.
func TestBlockSyncConfig() *BlockSyncConfig {
return DefaultBlockSyncConfig()
}
// ValidateBasic performs basic validation.
func (cfg *BlockSyncConfig) ValidateBasic() error {
switch cfg.Version {
case BlockSyncV0:
return nil
case BlockSyncV2:
return errors.New("blocksync version v2 is no longer supported. Please use v0")
default:
return fmt.Errorf("unknown blocksync version %s", cfg.Version)
}
}
//-----------------------------------------------------------------------------
// ConsensusConfig
// ConsensusConfig defines the configuration for the Tendermint consensus service,
// including timeouts and details about the WAL and the block structure.
type ConsensusConfig struct {
RootDir string `mapstructure:"home"`
WalPath string `mapstructure:"wal-file"`
walFile string // overrides WalPath if set
// TODO: remove timeout configs, these should be global not local
// How long we wait for a proposal block before prevoting nil
TimeoutPropose time.Duration `mapstructure:"timeout-propose"`
// How much timeout-propose increases with each round
TimeoutProposeDelta time.Duration `mapstructure:"timeout-propose-delta"`
// How long we wait after receiving +2/3 prevotes for “anything” (ie. not a single block or nil)
TimeoutPrevote time.Duration `mapstructure:"timeout-prevote"`
// How much the timeout-prevote increases with each round
TimeoutPrevoteDelta time.Duration `mapstructure:"timeout-prevote-delta"`
// How long we wait after receiving +2/3 precommits for “anything” (ie. not a single block or nil)
TimeoutPrecommit time.Duration `mapstructure:"timeout-precommit"`
// How much the timeout-precommit increases with each round
TimeoutPrecommitDelta time.Duration `mapstructure:"timeout-precommit-delta"`
// How long we wait after committing a block, before starting on the new
// height (this gives us a chance to receive some more precommits, even
// though we already have +2/3).
TimeoutCommit time.Duration `mapstructure:"timeout-commit"`
// Make progress as soon as we have all the precommits (as if TimeoutCommit = 0)
SkipTimeoutCommit bool `mapstructure:"skip-timeout-commit"`
// EmptyBlocks mode and possible interval between empty blocks
CreateEmptyBlocks bool `mapstructure:"create-empty-blocks"`
CreateEmptyBlocksInterval time.Duration `mapstructure:"create-empty-blocks-interval"`
// Reactor sleep duration parameters
PeerGossipSleepDuration time.Duration `mapstructure:"peer-gossip-sleep-duration"`
PeerQueryMaj23SleepDuration time.Duration `mapstructure:"peer-query-maj23-sleep-duration"`
DoubleSignCheckHeight int64 `mapstructure:"double-sign-check-height"`
}
// DefaultConsensusConfig returns a default configuration for the consensus service
func DefaultConsensusConfig() *ConsensusConfig {
return &ConsensusConfig{
WalPath: filepath.Join(defaultDataDir, "cs.wal", "wal"),
TimeoutPropose: 3000 * time.Millisecond,
TimeoutProposeDelta: 500 * time.Millisecond,
TimeoutPrevote: 1000 * time.Millisecond,
TimeoutPrevoteDelta: 500 * time.Millisecond,
TimeoutPrecommit: 1000 * time.Millisecond,
TimeoutPrecommitDelta: 500 * time.Millisecond,
TimeoutCommit: 1000 * time.Millisecond,
SkipTimeoutCommit: false,
CreateEmptyBlocks: true,
CreateEmptyBlocksInterval: 0 * time.Second,
PeerGossipSleepDuration: 100 * time.Millisecond,
PeerQueryMaj23SleepDuration: 2000 * time.Millisecond,
DoubleSignCheckHeight: int64(0),
}
}
// TestConsensusConfig returns a configuration for testing the consensus service
func TestConsensusConfig() *ConsensusConfig {
cfg := DefaultConsensusConfig()
cfg.TimeoutPropose = 40 * time.Millisecond
cfg.TimeoutProposeDelta = 1 * time.Millisecond
cfg.TimeoutPrevote = 10 * time.Millisecond
cfg.TimeoutPrevoteDelta = 1 * time.Millisecond
cfg.TimeoutPrecommit = 10 * time.Millisecond
cfg.TimeoutPrecommitDelta = 1 * time.Millisecond
cfg.TimeoutCommit = 10 * time.Millisecond
cfg.SkipTimeoutCommit = true
cfg.PeerGossipSleepDuration = 5 * time.Millisecond
cfg.PeerQueryMaj23SleepDuration = 250 * time.Millisecond
cfg.DoubleSignCheckHeight = int64(0)
return cfg
}
// WaitForTxs returns true if the consensus should wait for transactions before entering the propose step
func (cfg *ConsensusConfig) WaitForTxs() bool {
return !cfg.CreateEmptyBlocks || cfg.CreateEmptyBlocksInterval > 0
}
// Propose returns the amount of time to wait for a proposal
func (cfg *ConsensusConfig) Propose(round int32) time.Duration {
return time.Duration(
cfg.TimeoutPropose.Nanoseconds()+cfg.TimeoutProposeDelta.Nanoseconds()*int64(round),
) * time.Nanosecond
}
// Prevote returns the amount of time to wait for straggler votes after receiving any +2/3 prevotes
func (cfg *ConsensusConfig) Prevote(round int32) time.Duration {
return time.Duration(
cfg.TimeoutPrevote.Nanoseconds()+cfg.TimeoutPrevoteDelta.Nanoseconds()*int64(round),
) * time.Nanosecond
}
// Precommit returns the amount of time to wait for straggler votes after receiving any +2/3 precommits
func (cfg *ConsensusConfig) Precommit(round int32) time.Duration {
return time.Duration(
cfg.TimeoutPrecommit.Nanoseconds()+cfg.TimeoutPrecommitDelta.Nanoseconds()*int64(round),
) * time.Nanosecond
}
// Commit returns the amount of time to wait for straggler votes after receiving +2/3 precommits
// for a single block (ie. a commit).
func (cfg *ConsensusConfig) Commit(t time.Time) time.Time {
return t.Add(cfg.TimeoutCommit)
}
// WalFile returns the full path to the write-ahead log file
func (cfg *ConsensusConfig) WalFile() string {
if cfg.walFile != "" {
return cfg.walFile
}
return rootify(cfg.WalPath, cfg.RootDir)
}
// SetWalFile sets the path to the write-ahead log file
func (cfg *ConsensusConfig) SetWalFile(walFile string) {
cfg.walFile = walFile
}
// ValidateBasic performs basic validation (checking param bounds, etc.) and
// returns an error if any check fails.
func (cfg *ConsensusConfig) ValidateBasic() error {
if cfg.TimeoutPropose < 0 {
return errors.New("timeout-propose can't be negative")
}
if cfg.TimeoutProposeDelta < 0 {
return errors.New("timeout-propose-delta can't be negative")
}
if cfg.TimeoutPrevote < 0 {
return errors.New("timeout-prevote can't be negative")
}
if cfg.TimeoutPrevoteDelta < 0 {
return errors.New("timeout-prevote-delta can't be negative")
}
if cfg.TimeoutPrecommit < 0 {
return errors.New("timeout-precommit can't be negative")
}
if cfg.TimeoutPrecommitDelta < 0 {
return errors.New("timeout-precommit-delta can't be negative")
}
if cfg.TimeoutCommit < 0 {
return errors.New("timeout-commit can't be negative")
}
if cfg.CreateEmptyBlocksInterval < 0 {
return errors.New("create-empty-blocks-interval can't be negative")
}
if cfg.PeerGossipSleepDuration < 0 {
return errors.New("peer-gossip-sleep-duration can't be negative")
}
if cfg.PeerQueryMaj23SleepDuration < 0 {
return errors.New("peer-query-maj23-sleep-duration can't be negative")
}
if cfg.DoubleSignCheckHeight < 0 {
return errors.New("double-sign-check-height can't be negative")
}
return nil
}
//-----------------------------------------------------------------------------
// TxIndexConfig
// Remember that Event has the following structure:
// type: [
// key: value,
// ...
// ]
//
// CompositeKeys are constructed by `type.key`
// TxIndexConfig defines the configuration for the transaction indexer,
// including composite keys to index.
type TxIndexConfig struct {
// The backend database list to back the indexer.
// If list contains `null`, meaning no indexer service will be used.
//
// Options:
// 1) "null" - no indexer services.
// 2) "kv" (default) - the simplest possible indexer,
// backed by key-value storage (defaults to levelDB; see DBBackend).
// 3) "psql" - the indexer services backed by PostgreSQL.
Indexer []string `mapstructure:"indexer"`
// The PostgreSQL connection configuration, the connection format:
// postgresql://<user>:<password>@<host>:<port>/<db>?<opts>
PsqlConn string `mapstructure:"psql-conn"`
}
// DefaultTxIndexConfig returns a default configuration for the transaction indexer.
func DefaultTxIndexConfig() *TxIndexConfig {
return &TxIndexConfig{
Indexer: []string{"kv"},
}
}
// TestTxIndexConfig returns a default configuration for the transaction indexer.
func TestTxIndexConfig() *TxIndexConfig {
return DefaultTxIndexConfig()
}
//-----------------------------------------------------------------------------
// InstrumentationConfig
// InstrumentationConfig defines the configuration for metrics reporting.
type InstrumentationConfig struct {
// When true, Prometheus metrics are served under /metrics on
// PrometheusListenAddr.
// Check out the documentation for the list of available metrics.
Prometheus bool `mapstructure:"prometheus"`
// Address to listen for Prometheus collector(s) connections.
PrometheusListenAddr string `mapstructure:"prometheus-listen-addr"`
// Maximum number of simultaneous connections.
// If you want to accept a larger number than the default, make sure
// you increase your OS limits.
// 0 - unlimited.
MaxOpenConnections int `mapstructure:"max-open-connections"`
// Instrumentation namespace.
Namespace string `mapstructure:"namespace"`
}
// DefaultInstrumentationConfig returns a default configuration for metrics
// reporting.
func DefaultInstrumentationConfig() *InstrumentationConfig {
return &InstrumentationConfig{
Prometheus: false,
PrometheusListenAddr: ":26660",
MaxOpenConnections: 3,
Namespace: "tendermint",
}
}
// TestInstrumentationConfig returns a default configuration for metrics
// reporting.
func TestInstrumentationConfig() *InstrumentationConfig {
return DefaultInstrumentationConfig()
}
// ValidateBasic performs basic validation (checking param bounds, etc.) and
// returns an error if any check fails.
func (cfg *InstrumentationConfig) ValidateBasic() error {
if cfg.MaxOpenConnections < 0 {
return errors.New("max-open-connections can't be negative")
}
return nil
}
//-----------------------------------------------------------------------------
// Utils
// helper function to make config creation independent of root dir
func rootify(path, root string) string {
if filepath.IsAbs(path) {
return path
}
return filepath.Join(root, path)
}
//-----------------------------------------------------------------------------
// Moniker
var defaultMoniker = getDefaultMoniker()
// getDefaultMoniker returns a default moniker, which is the host name. If runtime
// fails to get the host name, "anonymous" will be returned.
func getDefaultMoniker() string {
moniker, err := os.Hostname()
if err != nil {
moniker = "anonymous"
}
return moniker
}