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