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115 lines
3.2 KiB
115 lines
3.2 KiB
package types
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import (
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"encoding/json"
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"io/ioutil"
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"time"
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"github.com/pkg/errors"
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crypto "github.com/tendermint/go-crypto"
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cmn "github.com/tendermint/tmlibs/common"
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)
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//------------------------------------------------------------
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// core types for a genesis definition
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// GenesisValidator is an initial validator.
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type GenesisValidator struct {
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PubKey crypto.PubKey `json:"pub_key"`
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Power int64 `json:"power"`
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Name string `json:"name"`
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}
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// GenesisDoc defines the initial conditions for a tendermint blockchain, in particular its validator set.
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type GenesisDoc struct {
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GenesisTime time.Time `json:"genesis_time"`
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ChainID string `json:"chain_id"`
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ConsensusParams *ConsensusParams `json:"consensus_params,omitempty"`
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Validators []GenesisValidator `json:"validators"`
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AppHash cmn.HexBytes `json:"app_hash"`
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AppOptions interface{} `json:"app_options,omitempty"`
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}
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// SaveAs is a utility method for saving GenensisDoc as a JSON file.
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func (genDoc *GenesisDoc) SaveAs(file string) error {
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genDocBytes, err := json.Marshal(genDoc)
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if err != nil {
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return err
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}
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return cmn.WriteFile(file, genDocBytes, 0644)
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}
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// ValidatorHash returns the hash of the validator set contained in the GenesisDoc
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func (genDoc *GenesisDoc) ValidatorHash() []byte {
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vals := make([]*Validator, len(genDoc.Validators))
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for i, v := range genDoc.Validators {
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vals[i] = NewValidator(v.PubKey, v.Power)
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}
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vset := NewValidatorSet(vals)
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return vset.Hash()
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}
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// ValidateAndComplete checks that all necessary fields are present
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// and fills in defaults for optional fields left empty
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func (genDoc *GenesisDoc) ValidateAndComplete() error {
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if genDoc.ChainID == "" {
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return errors.Errorf("Genesis doc must include non-empty chain_id")
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}
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if genDoc.ConsensusParams == nil {
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genDoc.ConsensusParams = DefaultConsensusParams()
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} else {
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if err := genDoc.ConsensusParams.Validate(); err != nil {
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return err
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}
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}
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if len(genDoc.Validators) == 0 {
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return errors.Errorf("The genesis file must have at least one validator")
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}
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for _, v := range genDoc.Validators {
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if v.Power == 0 {
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return errors.Errorf("The genesis file cannot contain validators with no voting power: %v", v)
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}
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}
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if genDoc.GenesisTime.IsZero() {
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genDoc.GenesisTime = time.Now()
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}
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return nil
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}
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//------------------------------------------------------------
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// Make genesis state from file
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// GenesisDocFromJSON unmarshalls JSON data into a GenesisDoc.
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func GenesisDocFromJSON(jsonBlob []byte) (*GenesisDoc, error) {
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genDoc := GenesisDoc{}
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err := json.Unmarshal(jsonBlob, &genDoc)
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if err != nil {
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return nil, err
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}
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if err := genDoc.ValidateAndComplete(); err != nil {
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return nil, err
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}
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return &genDoc, err
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}
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// GenesisDocFromFile reads JSON data from a file and unmarshalls it into a GenesisDoc.
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func GenesisDocFromFile(genDocFile string) (*GenesisDoc, error) {
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jsonBlob, err := ioutil.ReadFile(genDocFile)
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if err != nil {
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return nil, errors.Wrap(err, "Couldn't read GenesisDoc file")
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}
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genDoc, err := GenesisDocFromJSON(jsonBlob)
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if err != nil {
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return nil, errors.Wrap(err, cmn.Fmt("Error reading GenesisDoc at %v", genDocFile))
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}
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return genDoc, nil
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}
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