87 lines
2.4 KiB
Go
87 lines
2.4 KiB
Go
package main
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import log "github.com/sirupsen/logrus"
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//import "io/ioutil"
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import "fmt"
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import "strconv"
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const appPrefix = "steem-block-fetcher"
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type SteemDataStorer interface {
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SetCurrentBlockHeight() error
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ForceSetCurrentBlockHeight(BlockNumber) error
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CurrentBlockHeight() BlockNumber
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HaveOpsForBlock(BlockNumber) bool
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StoreBlockOps(BlockNumber, *[]byte) error
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}
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// SteemDataStore is the object with which the rest of this tool interacts
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type SteemDataStore struct {
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kv KVStorer
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}
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func NewSteemDataStore(dir string) *SteemDataStore {
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self := new(SteemDataStore)
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self.kv = NewRedisKVStore()
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return self
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}
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func (self *SteemDataStore) ForceSetCurrentBlockHeight(blockNum BlockNumber) error {
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keyname := fmt.Sprintf("%s:global:CurrentBlockHeight", appPrefix)
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value := fmt.Sprintf("%d", blockNum)
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return self.kv.Put(&keyname, &value)
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}
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// this function searches for the highest contiguously stored blocknum
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// and updates the memo in the db
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func (self *SteemDataStore) SetCurrentBlockHeight() error {
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nextVal := self.FindHighestContiguousBlockInDb(self.CurrentBlockHeight())
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keyname := fmt.Sprintf("%s:global:CurrentBlockHeight", appPrefix)
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value := fmt.Sprintf("%d", nextVal)
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log.Infof("updating our current highest block in db to %d", nextVal)
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return self.kv.Put(&keyname, &value)
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}
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func (self *SteemDataStore) FindHighestContiguousBlockInDb(from BlockNumber) BlockNumber {
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last := from
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var keyname string
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var try BlockNumber
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for {
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try = BlockNumber(uint64(last) + 1)
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keyname = fmt.Sprintf("%s:BlockOps:%d", appPrefix, try)
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exists, _ := self.kv.Exists(&keyname)
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if exists == false {
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log.Debugf("cannot find block %d in db, highest found is %d", try, last)
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return last
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} else {
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last = try
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}
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}
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}
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func (self *SteemDataStore) StoreBlockOps(blockNum BlockNumber, blockOps *[]byte) error {
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keyname := fmt.Sprintf("%s:BlockOps:%d", appPrefix, blockNum)
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value := string(*blockOps)
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return self.kv.Put(&keyname, &value)
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}
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func (self *SteemDataStore) HaveOpsForBlock(blockNum BlockNumber) bool {
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panic("unimplemented")
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}
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func (self *SteemDataStore) CurrentBlockHeight() BlockNumber {
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keyname := fmt.Sprintf("%s:global:CurrentBlockHeight", appPrefix)
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val, err := self.kv.Get(&keyname)
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if err != nil {
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// assume this is key not found, initialize key to default
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self.ForceSetCurrentBlockHeight(0)
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// retry
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return self.CurrentBlockHeight()
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}
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intval, err := strconv.ParseUint(*val, 10, 64)
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return BlockNumber(intval)
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}
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