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134 lines
3.9 KiB
134 lines
3.9 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 Tendermint client.
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*/
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package client
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import (
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"fmt"
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log "github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/lite"
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lerr "github.com/tendermint/tendermint/lite/errors"
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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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)
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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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logger log.Logger
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chainID string
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client SignStatusClient
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}
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// NewProvider implements Provider (but not PersistentProvider).
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func NewProvider(chainID string, client SignStatusClient) lite.Provider {
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return &provider{
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logger: log.NewNopLogger(),
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chainID: chainID,
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client: client,
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}
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}
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// NewHTTPProvider can connect 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(chainID, remote string) lite.Provider {
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return NewProvider(chainID, rpcclient.NewHTTP(remote, "/websocket"))
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}
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// Implements Provider.
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func (p *provider) SetLogger(logger log.Logger) {
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logger = logger.With("module", "lite/client")
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p.logger = logger
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}
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// StatusClient returns the internal client as a StatusClient
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func (p *provider) StatusClient() rpcclient.StatusClient {
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return p.client
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}
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// LatestFullCommit implements Provider.
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func (p *provider) LatestFullCommit(chainID string, minHeight, maxHeight int64) (fc lite.FullCommit, err error) {
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if chainID != p.chainID {
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err = fmt.Errorf("expected chainID %s, got %s", p.chainID, chainID)
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return
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}
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if maxHeight != 0 && maxHeight < minHeight {
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err = fmt.Errorf("need maxHeight == 0 or minHeight <= maxHeight, got min %v and max %v",
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minHeight, maxHeight)
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return
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}
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commit, err := p.fetchLatestCommit(minHeight, maxHeight)
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if err != nil {
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return
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}
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fc, err = p.fillFullCommit(commit.SignedHeader)
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return
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}
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// fetchLatestCommit fetches the latest commit from the client.
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func (p *provider) fetchLatestCommit(minHeight int64, maxHeight int64) (*ctypes.ResultCommit, error) {
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status, err := p.client.Status()
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if err != nil {
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return nil, err
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}
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if status.SyncInfo.LatestBlockHeight < minHeight {
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err = fmt.Errorf("provider is at %v but require minHeight=%v",
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status.SyncInfo.LatestBlockHeight, minHeight)
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return nil, err
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}
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if maxHeight == 0 {
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maxHeight = status.SyncInfo.LatestBlockHeight
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} else if status.SyncInfo.LatestBlockHeight < maxHeight {
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maxHeight = status.SyncInfo.LatestBlockHeight
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}
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return p.client.Commit(&maxHeight)
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}
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// Implements Provider.
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func (p *provider) ValidatorSet(chainID string, height int64) (valset *types.ValidatorSet, err error) {
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return p.getValidatorSet(chainID, height)
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}
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func (p *provider) getValidatorSet(chainID string, height int64) (valset *types.ValidatorSet, err error) {
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if chainID != p.chainID {
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err = fmt.Errorf("expected chainID %s, got %s", p.chainID, chainID)
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return
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}
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if height < 1 {
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err = fmt.Errorf("expected height >= 1, got height %v", height)
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return
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}
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res, err := p.client.Validators(&height)
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if err != nil {
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// TODO pass through other types of errors.
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return nil, lerr.ErrUnknownValidators(chainID, height)
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}
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valset = types.NewValidatorSet(res.Validators)
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return
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}
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// This does no validation.
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func (p *provider) fillFullCommit(signedHeader types.SignedHeader) (fc lite.FullCommit, err error) {
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// Get the validators.
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valset, err := p.getValidatorSet(signedHeader.ChainID, signedHeader.Height)
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if err != nil {
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return lite.FullCommit{}, err
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}
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// Get the next validators.
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nextValset, err := p.getValidatorSet(signedHeader.ChainID, signedHeader.Height+1)
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if err != nil {
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return lite.FullCommit{}, err
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}
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return lite.NewFullCommit(signedHeader, valset, nextValset), nil
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}
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