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epoch.go
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epoch.go
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package handlers
import (
"database/sql"
"encoding/json"
"eth2-exporter/db"
"eth2-exporter/templates"
"eth2-exporter/types"
"eth2-exporter/utils"
"fmt"
"net/http"
"strconv"
"strings"
"github.com/gorilla/mux"
)
// Epoch will show the epoch using a go template
func Epoch(w http.ResponseWriter, r *http.Request) {
epochTemplateFiles := append(layoutTemplateFiles, "epoch.html")
epochFutureTemplateFiles := append(layoutTemplateFiles, "epochFuture.html")
epochNotFoundTemplateFiles := append(layoutTemplateFiles, "epochnotfound.html")
var epochTemplate = templates.GetTemplate(epochTemplateFiles...)
var epochFutureTemplate = templates.GetTemplate(epochFutureTemplateFiles...)
var epochNotFoundTemplate = templates.GetTemplate(epochNotFoundTemplateFiles...)
const MaxEpochValue = 4294967296 // we only render a page for epochs up to this value
w.Header().Set("Content-Type", "text/html")
vars := mux.Vars(r)
epochString := strings.Replace(vars["epoch"], "0x", "", -1)
epochTitle := fmt.Sprintf("Epoch %v", epochString)
epoch, err := strconv.ParseUint(epochString, 10, 64)
metaPath := fmt.Sprintf("/epoch/%v", epoch)
if err != nil {
data := InitPageData(w, r, "blockchain", metaPath, epochTitle, append(layoutTemplateFiles, epochNotFoundTemplateFiles...))
if handleTemplateError(w, r, "epoch.go", "Epoch", "parse epochString", epochNotFoundTemplate.ExecuteTemplate(w, "layout", data)) != nil {
return // an error has occurred and was processed
}
return
}
epochPageData := types.EpochPageData{}
err = db.ReaderDb.Get(&epochPageData, `
SELECT
epoch,
blockscount,
proposerslashingscount,
attesterslashingscount,
attestationscount,
depositscount,
voluntaryexitscount,
validatorscount,
averagevalidatorbalance,
finalized,
eligibleether,
globalparticipationrate,
votedether
FROM epochs
WHERE epoch = $1`, epoch)
if err != nil {
//Epoch not in database -> Show future epoch
if epoch > MaxEpochValue {
data := InitPageData(w, r, "blockchain", metaPath, epochTitle, append(layoutTemplateFiles, epochNotFoundTemplateFiles...))
if handleTemplateError(w, r, "epoch.go", "Epoch", ">MaxEpochValue", epochNotFoundTemplate.ExecuteTemplate(w, "layout", data)) != nil {
return // an error has occurred and was processed
}
return
}
//Create placeholder structs
blocks := make([]*types.IndexPageDataBlocks, utils.Config.Chain.Config.SlotsPerEpoch)
for i := range blocks {
slot := uint64(i) + (epoch * utils.Config.Chain.Config.SlotsPerEpoch)
block := types.IndexPageDataBlocks{
Epoch: epoch,
Slot: slot,
Ts: utils.SlotToTime(slot),
Status: 4,
}
blocks[31-i] = &block
}
epochPageData = types.EpochPageData{
Epoch: epoch,
BlocksCount: utils.Config.Chain.Config.SlotsPerEpoch,
PreviousEpoch: epoch - 1,
NextEpoch: epoch + 1,
Ts: utils.EpochToTime(epoch),
Blocks: blocks,
}
//Render template
data := InitPageData(w, r, "blockchain", metaPath, epochTitle, append(layoutTemplateFiles, epochFutureTemplateFiles...))
data.Data = epochPageData
if handleTemplateError(w, r, "epoch.go", "Epoch", "Done (not in Database)", epochFutureTemplate.ExecuteTemplate(w, "layout", data)) != nil {
return // an error has occurred and was processed
}
return
}
err = db.ReaderDb.Select(&epochPageData.Blocks, `
SELECT
blocks.slot,
blocks.proposer,
blocks.blockroot,
blocks.parentroot,
blocks.attestationscount,
blocks.depositscount,
blocks.withdrawalcount,
blocks.voluntaryexitscount,
blocks.proposerslashingscount,
blocks.attesterslashingscount,
blocks.status,
blocks.syncaggregate_participation,
COALESCE(validator_names.name, '') AS name
FROM blocks
LEFT JOIN validators ON blocks.proposer = validators.validatorindex
LEFT JOIN validator_names ON validators.pubkey = validator_names.publickey
WHERE epoch = $1
ORDER BY blocks.slot DESC`, epoch)
if err != nil {
logger.Errorf("error epoch blocks data: %v", err)
data := InitPageData(w, r, "blockchain", metaPath, epochTitle, append(layoutTemplateFiles, epochNotFoundTemplateFiles...))
if handleTemplateError(w, r, "epoch.go", "Epoch", "read Blocks from db", epochNotFoundTemplate.ExecuteTemplate(w, "layout", data)) != nil {
return // an error has occurred and was processed
}
return
}
for _, block := range epochPageData.Blocks {
block.Ts = utils.SlotToTime(block.Slot)
block.ProposerFormatted = utils.FormatValidatorWithName(block.Proposer, block.ProposerName)
switch block.Status {
case 0:
epochPageData.ScheduledCount += 1
case 1:
epochPageData.ProposedCount += 1
epochPageData.SyncParticipationRate += block.SyncAggParticipation
epochPageData.WithdrawalCount += block.Withdrawals
case 2:
epochPageData.MissedCount += 1
case 3:
epochPageData.OrphanedCount += 1
}
}
withdrawalTotal, err := db.GetEpochWithdrawalsTotal(epoch)
if err != nil {
logger.Errorf("error getting epoch withdrawals total: %v", err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
epochPageData.WithdrawalTotal = utils.FormatCurrentBalance(withdrawalTotal, GetCurrency(r))
epochPageData.SyncParticipationRate /= float64(epochPageData.ProposedCount)
epochPageData.Ts = utils.EpochToTime(epochPageData.Epoch)
err = db.ReaderDb.Get(&epochPageData.NextEpoch, "SELECT epoch FROM epochs WHERE epoch > $1 ORDER BY epoch LIMIT 1", epochPageData.Epoch)
if err == sql.ErrNoRows {
epochPageData.NextEpoch = 0
} else if err != nil {
logger.Errorf("error retrieving next epoch for epoch %v: %v", epochPageData.Epoch, err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
if epochPageData.Epoch == 0 {
epochPageData.PreviousEpoch = 0
} else {
err = db.ReaderDb.Get(&epochPageData.PreviousEpoch, "SELECT epoch FROM epochs WHERE epoch < $1 ORDER BY epoch DESC LIMIT 1", epochPageData.Epoch)
if err != nil {
logger.Errorf("error retrieving previous epoch for epoch %v: %v", epochPageData.Epoch, err)
epochPageData.PreviousEpoch = 0
}
}
data := InitPageData(w, r, "blockchain", metaPath, epochTitle, append(layoutTemplateFiles, epochTemplateFiles...))
data.Data = epochPageData
if utils.IsApiRequest(r) {
w.Header().Set("Content-Type", "application/json")
err = json.NewEncoder(w).Encode(data.Data)
} else {
err = epochTemplate.ExecuteTemplate(w, "layout", data)
}
if handleTemplateError(w, r, "epoch.go", "Epoch", "Done", err) != nil {
return // an error has occurred and was processed
}
}