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genesis.go
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genesis.go
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package types
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"time"
"github.com/tendermint/tendermint/crypto"
cmn "github.com/tendermint/tendermint/libs/common"
tmtime "github.com/tendermint/tendermint/types/time"
)
const (
// MaxChainIDLen is a maximum length of the chain ID.
MaxChainIDLen = 50
)
//------------------------------------------------------------
// core types for a genesis definition
// GenesisValidator is an initial validator.
type GenesisValidator struct {
Address Address `json:"address"`
PubKey crypto.PubKey `json:"pub_key"`
Power int64 `json:"power"`
Name string `json:"name"`
}
// GenesisDoc defines the initial conditions for a tendermint blockchain, in particular its validator set.
type GenesisDoc struct {
GenesisTime time.Time `json:"genesis_time"`
ChainID string `json:"chain_id"`
ConsensusParams *ConsensusParams `json:"consensus_params,omitempty"`
Validators []GenesisValidator `json:"validators,omitempty"`
AppHash cmn.HexBytes `json:"app_hash"`
AppState json.RawMessage `json:"app_state,omitempty"`
}
// SaveAs is a utility method for saving GenensisDoc as a JSON file.
func (genDoc *GenesisDoc) SaveAs(file string) error {
genDocBytes, err := cdc.MarshalJSONIndent(genDoc, "", " ")
if err != nil {
return err
}
return cmn.WriteFile(file, genDocBytes, 0644)
}
// ValidatorHash returns the hash of the validator set contained in the GenesisDoc
func (genDoc *GenesisDoc) ValidatorHash() []byte {
vals := make([]*Validator, len(genDoc.Validators))
for i, v := range genDoc.Validators {
vals[i] = NewValidator(v.PubKey, v.Power)
}
vset := NewValidatorSet(vals)
return vset.Hash()
}
// ValidateAndComplete checks that all necessary fields are present
// and fills in defaults for optional fields left empty
func (genDoc *GenesisDoc) ValidateAndComplete() error {
if genDoc.ChainID == "" {
return cmn.NewError("Genesis doc must include non-empty chain_id")
}
if len(genDoc.ChainID) > MaxChainIDLen {
return cmn.NewError("chain_id in genesis doc is too long (max: %d)", MaxChainIDLen)
}
if genDoc.ConsensusParams == nil {
genDoc.ConsensusParams = DefaultConsensusParams()
} else {
if err := genDoc.ConsensusParams.Validate(); err != nil {
return err
}
}
for i, v := range genDoc.Validators {
if v.Power == 0 {
return cmn.NewError("The genesis file cannot contain validators with no voting power: %v", v)
}
if len(v.Address) > 0 && !bytes.Equal(v.PubKey.Address(), v.Address) {
return cmn.NewError("Incorrect address for validator %v in the genesis file, should be %v", v, v.PubKey.Address())
}
if len(v.Address) == 0 {
genDoc.Validators[i].Address = v.PubKey.Address()
}
}
if genDoc.GenesisTime.IsZero() {
genDoc.GenesisTime = tmtime.Now()
}
return nil
}
//------------------------------------------------------------
// Make genesis state from file
// GenesisDocFromJSON unmarshalls JSON data into a GenesisDoc.
func GenesisDocFromJSON(jsonBlob []byte) (*GenesisDoc, error) {
genDoc := GenesisDoc{}
err := cdc.UnmarshalJSON(jsonBlob, &genDoc)
if err != nil {
return nil, err
}
if err := genDoc.ValidateAndComplete(); err != nil {
return nil, err
}
return &genDoc, err
}
// GenesisDocFromFile reads JSON data from a file and unmarshalls it into a GenesisDoc.
func GenesisDocFromFile(genDocFile string) (*GenesisDoc, error) {
jsonBlob, err := ioutil.ReadFile(genDocFile)
if err != nil {
return nil, cmn.ErrorWrap(err, "Couldn't read GenesisDoc file")
}
genDoc, err := GenesisDocFromJSON(jsonBlob)
if err != nil {
return nil, cmn.ErrorWrap(err, fmt.Sprintf("Error reading GenesisDoc at %v", genDocFile))
}
return genDoc, nil
}