package types import ( "encoding/json" "fmt" "io/ioutil" "time" "github.com/tendermint/tendermint/crypto" cmn "github.com/tendermint/tendermint/libs/common" ) 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 { 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(fmt.Sprintf("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 _, v := range genDoc.Validators { if v.Power == 0 { return cmn.NewError("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 := 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 }