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package types
import (
"encoding/json"
"io/ioutil"
"time"
"github.com/pkg/errors"
crypto "github.com/tendermint/go-crypto"
cmn "github.com/tendermint/tmlibs/common"
)
//------------------------------------------------------------
// core types for a genesis definition
// GenesisValidator is an initial validator.
type GenesisValidator struct {
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"`
AppHash cmn.HexBytes `json:"app_hash"`
AppOptions interface{} `json:"app_options,omitempty"`
}
// SaveAs is a utility method for saving GenensisDoc as a JSON file.
func (genDoc *GenesisDoc) SaveAs(file string) error {
genDocBytes, err := json.Marshal(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 errors.Errorf("Genesis doc must include non-empty chain_id")
}
if genDoc.ConsensusParams == nil {
genDoc.ConsensusParams = DefaultConsensusParams()
} else {
if err := genDoc.ConsensusParams.Validate(); err != nil {
return err
}
}
if len(genDoc.Validators) == 0 {
return errors.Errorf("The genesis file must have at least one validator")
}
for _, v := range genDoc.Validators {
if v.Power == 0 {
return errors.Errorf("The genesis file cannot contain validators with no voting power: %v", v)
}
}
if genDoc.GenesisTime.IsZero() {
genDoc.GenesisTime = time.Now()
}
return nil
}
//------------------------------------------------------------
// Make genesis state from file
// GenesisDocFromJSON unmarshalls JSON data into a GenesisDoc.
func GenesisDocFromJSON(jsonBlob []byte) (*GenesisDoc, error) {
genDoc := GenesisDoc{}
err := json.Unmarshal(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, errors.Wrap(err, "Couldn't read GenesisDoc file")
}
genDoc, err := GenesisDocFromJSON(jsonBlob)
if err != nil {
return nil, errors.Wrap(err, cmn.Fmt("Error reading GenesisDoc at %v", genDocFile))
}
return genDoc, nil
}