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package lite
import (
lerr "github.com/tendermint/tendermint/lite/errors"
"github.com/tendermint/tendermint/types"
log "github.com/tendermint/tmlibs/log"
)
// multiProvider allows you to place one or more caches in front of a source
// Provider. It runs through them in order until a match is found.
type multiProvider struct {
logger log.Logger
providers []PersistentProvider
}
// NewMultiProvider returns a new provider which wraps multiple other providers.
func NewMultiProvider(providers ...PersistentProvider) *multiProvider {
return &multiProvider{
logger: log.NewNopLogger(),
providers: providers,
}
}
// SetLogger sets logger on self and all subproviders.
func (mc *multiProvider) SetLogger(logger log.Logger) {
mc.logger = logger
for _, p := range mc.providers {
p.SetLogger(logger)
}
}
// SaveFullCommit saves on all providers, and aborts on the first error.
func (mc *multiProvider) SaveFullCommit(fc FullCommit) (err error) {
for _, p := range mc.providers {
err = p.SaveFullCommit(fc)
if err != nil {
return
}
}
return
}
// LatestFullCommit loads the latest from all providers and provides
// the latest FullCommit that satisfies the conditions.
// Returns the first error encountered.
func (mc *multiProvider) LatestFullCommit(chainID string, minHeight, maxHeight int64) (fc FullCommit, err error) {
for _, p := range mc.providers {
var fc_ FullCommit
fc_, err = p.LatestFullCommit(chainID, minHeight, maxHeight)
if lerr.IsErrCommitNotFound(err) {
err = nil
continue
} else if err != nil {
return
}
if fc == (FullCommit{}) {
fc = fc_
} else if fc_.Height() > fc.Height() {
fc = fc_
}
if fc.Height() == maxHeight {
return
}
}
if fc == (FullCommit{}) {
err = lerr.ErrCommitNotFound()
return
}
return
}
// ValidatorSet returns validator set at height as provided by the first
// provider which has it, or an error otherwise.
func (mc *multiProvider) ValidatorSet(chainID string, height int64) (valset *types.ValidatorSet, err error) {
for _, p := range mc.providers {
valset, err = p.ValidatorSet(chainID, height)
if err == nil {
// TODO Log unexpected types of errors.
return valset, nil
}
}
return nil, lerr.ErrMissingValidators(chainID, height)
}