You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
138 lines
3.7 KiB
138 lines
3.7 KiB
/*
|
|
Package client defines a provider that uses a rpcclient
|
|
to get information, which is used to get new headers
|
|
and validators directly from a node.
|
|
*/
|
|
package client
|
|
|
|
import (
|
|
"bytes"
|
|
|
|
rpcclient "github.com/tendermint/tendermint/rpc/client"
|
|
ctypes "github.com/tendermint/tendermint/rpc/core/types"
|
|
"github.com/tendermint/tendermint/types"
|
|
|
|
"github.com/tendermint/tendermint/certifiers"
|
|
certerr "github.com/tendermint/tendermint/certifiers/errors"
|
|
)
|
|
|
|
type SignStatusClient interface {
|
|
rpcclient.SignClient
|
|
rpcclient.StatusClient
|
|
}
|
|
|
|
type provider struct {
|
|
node SignStatusClient
|
|
lastHeight int
|
|
}
|
|
|
|
// NewProvider can wrap any rpcclient to expose it as
|
|
// a read-only provider.
|
|
func NewProvider(node SignStatusClient) certifiers.Provider {
|
|
return &provider{node: node}
|
|
}
|
|
|
|
// NewProvider can connects to a tendermint json-rpc endpoint
|
|
// at the given url, and uses that as a read-only provider.
|
|
func NewHTTPProvider(remote string) certifiers.Provider {
|
|
return &provider{
|
|
node: rpcclient.NewHTTP(remote, "/websocket"),
|
|
}
|
|
}
|
|
|
|
// StatusClient returns the internal node as a StatusClient
|
|
func (p *provider) StatusClient() rpcclient.StatusClient {
|
|
return p.node
|
|
}
|
|
|
|
// StoreCommit is a noop, as clients can only read from the chain...
|
|
func (p *provider) StoreCommit(_ certifiers.FullCommit) error { return nil }
|
|
|
|
// GetHash gets the most recent validator and sees if it matches
|
|
//
|
|
// TODO: improve when the rpc interface supports more functionality
|
|
func (p *provider) GetByHash(hash []byte) (certifiers.FullCommit, error) {
|
|
var fc certifiers.FullCommit
|
|
vals, err := p.node.Validators(nil)
|
|
// if we get no validators, or a different height, return an error
|
|
if err != nil {
|
|
return fc, err
|
|
}
|
|
p.updateHeight(vals.BlockHeight)
|
|
vhash := types.NewValidatorSet(vals.Validators).Hash()
|
|
if !bytes.Equal(hash, vhash) {
|
|
return fc, certerr.ErrCommitNotFound()
|
|
}
|
|
return p.seedFromVals(vals)
|
|
}
|
|
|
|
// GetByHeight gets the validator set by height
|
|
func (p *provider) GetByHeight(h int) (fc certifiers.FullCommit, err error) {
|
|
commit, err := p.node.Commit(&h)
|
|
if err != nil {
|
|
return fc, err
|
|
}
|
|
return p.seedFromCommit(commit)
|
|
}
|
|
|
|
func (p *provider) LatestCommit() (fc certifiers.FullCommit, err error) {
|
|
commit, err := p.GetLatestCommit()
|
|
if err != nil {
|
|
return fc, err
|
|
}
|
|
return p.seedFromCommit(commit)
|
|
}
|
|
|
|
// GetLatestCommit should return the most recent commit there is,
|
|
// which handles queries for future heights as per the semantics
|
|
// of GetByHeight.
|
|
func (p *provider) GetLatestCommit() (*ctypes.ResultCommit, error) {
|
|
status, err := p.node.Status()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return p.node.Commit(&status.LatestBlockHeight)
|
|
}
|
|
|
|
func CommitFromResult(result *ctypes.ResultCommit) certifiers.Commit {
|
|
return (certifiers.Commit)(result.SignedHeader)
|
|
}
|
|
|
|
func (p *provider) seedFromVals(vals *ctypes.ResultValidators) (certifiers.FullCommit, error) {
|
|
// now get the commits and build a full commit
|
|
commit, err := p.node.Commit(&vals.BlockHeight)
|
|
if err != nil {
|
|
return certifiers.FullCommit{}, err
|
|
}
|
|
fc := certifiers.NewFullCommit(
|
|
CommitFromResult(commit),
|
|
types.NewValidatorSet(vals.Validators),
|
|
)
|
|
return fc, nil
|
|
}
|
|
|
|
func (p *provider) seedFromCommit(commit *ctypes.ResultCommit) (fc certifiers.FullCommit, err error) {
|
|
fc.Commit = CommitFromResult(commit)
|
|
|
|
// now get the proper validators
|
|
vals, err := p.node.Validators(&commit.Header.Height)
|
|
if err != nil {
|
|
return fc, err
|
|
}
|
|
|
|
// make sure they match the commit (as we cannot enforce height)
|
|
vset := types.NewValidatorSet(vals.Validators)
|
|
if !bytes.Equal(vset.Hash(), commit.Header.ValidatorsHash) {
|
|
return fc, certerr.ErrValidatorsChanged()
|
|
}
|
|
|
|
p.updateHeight(commit.Header.Height)
|
|
fc.Validators = vset
|
|
return fc, nil
|
|
}
|
|
|
|
func (p *provider) updateHeight(h int) {
|
|
if h > p.lastHeight {
|
|
p.lastHeight = h
|
|
}
|
|
}
|