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tronchecker.go
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package checkup
import (
"bytes"
"encoding/binary"
"encoding/hex"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"strings"
"time"
"github.com/sourcegraph/checkup/utils"
)
type Block struct {
BlockID string `json:"blockID`
BlockHeader BlockHeader `json:"block_header"`
// TODO: Transactions
}
type BlockHeader struct {
Witness string `json:"witness_signature"`
RawData RawData `json:"raw_data"`
}
type RawData struct {
TxTrieRoot string `json:"txTrieRoot"`
ParentHash string `json:"parentHash"`
Timestamp int64 `json:"timestamp"`
Number int64 `json:"number"`
WitnessAdress string `json:"witness_address"`
Version int `json:"version"`
}
// GetBlockID return the block ID
func (bc *Block) GetBlockID() string {
return bc.BlockID
}
// GetBlockHeight return the block height
func (bc *Block) GetBlockHeight() int64 {
return bc.BlockHeader.RawData.Number
}
// GetTimestamp return the block timestamp
func (bc *Block) GetTimestamp() int64 {
return bc.BlockHeader.RawData.Timestamp
}
// GetBlockHash return the block hash, the calculation defined in java-tron/src/main/java/org/tron/core/capsule/TransactionCapsule.java:setReference()
// setRefBlockHash(ByteString.copyFrom(ByteArray.subArray(blockHash, 8, 16)))
func (bc *Block) GetBlockHash() []byte {
blockHash, _ := hex.DecodeString(bc.GetBlockID())
return blockHash[8:16]
}
// GetBlockBytes return the block hash, the calculation defined in java-tron/src/main/java/org/tron/core/capsule/TransactionCapsule.java:setReference()
// setRefBlockBytes(ByteString.copyFrom(ByteArray.subArray(refBlockNum, 6, 8)))
func (bc *Block) GetBlockBytes() []byte {
var buf = make([]byte, 8)
binary.BigEndian.PutUint64(buf, uint64(bc.GetBlockHeight()))
return buf[6:8]
}
// GetBlockHashString return the hex encoded string of the block hash
func (bc *Block) GetBlockHashString() string {
return hex.EncodeToString(bc.GetBlockHash())
}
// GetBlockBytesString return the hex encoded string of the block bytes
func (bc *Block) GetBlockBytesString() string {
return hex.EncodeToString(bc.GetBlockBytes())
}
// TronChecker implements a Checker for Tron endpoints.
type TronChecker struct {
// Name is the name of the endpoint.
Name string `json:"endpoint_name"`
// URL is the URL of the endpoint.
URL string `json:"endpoint_url"`
// User is the user name
User string `json:"user"`
// Password is the password
Password string `json:"password"`
// BlockHeightBehind is the threshold of the current block height behind etherscan
BlockHeightBehind uint32 `json:"blockHeightBehind"`
// URL is the URL of the endpoint.
ReferURL string `json:"refer_url,omitempty"`
// UpStatus is the HTTP status code expected by
// a healthy endpoint. Default is http.StatusOK.
UpStatus int `json:"up_status,omitempty"`
// ThresholdRTT is the maximum round trip time to
// allow for a healthy endpoint. If non-zero and a
// request takes longer than ThresholdRTT, the
// endpoint will be considered unhealthy. Note that
// this duration includes any in-between network
// latency.
ThresholdRTT time.Duration `json:"threshold_rtt,omitempty"`
// MustContain is a string that the response body
// must contain in order to be considered up.
// NOTE: If set, the entire response body will
// be consumed, which has the potential of using
// lots of memory and slowing down checks if the
// response body is large.
MustContain string `json:"must_contain,omitempty"`
// MustNotContain is a string that the response
// body must NOT contain in order to be considered
// up. If both MustContain and MustNotContain are
// set, they are and-ed together. NOTE: If set,
// the entire response body will be consumed, which
// has the potential of using lots of memory and
// slowing down checks if the response body is large.
MustNotContain string `json:"must_not_contain,omitempty"`
// Attempts is how many requests the client will
// make to the endpoint in a single check.
Attempts int `json:"attempts,omitempty"`
// AttemptSpacing spaces out each attempt in a check
// by this duration to avoid hitting a remote too
// quickly in succession. By default, no waiting
// occurs between attempts.
AttemptSpacing time.Duration `json:"attempt_spacing,omitempty"`
// Client is the http.Client with which to make
// requests. If not set, DefaultHTTPClient is
// used.
Client *http.Client `json:"-"`
// Headers contains headers to added to the request
// that is sent for the check
Headers http.Header `json:"headers,omitempty"`
}
// Check performs checks using c according to its configuration.
// An error is only returned if there is a configuration error.
func (c TronChecker) Check() (Result, error) {
if c.Attempts < 1 {
c.Attempts = 1
}
if c.Client == nil {
c.Client = DefaultHTTPClient
}
if c.UpStatus == 0 {
c.UpStatus = http.StatusOK
}
result := Result{Title: c.Name, Endpoint: c.URL, Timestamp: Timestamp()}
req, err := http.NewRequest("POST", c.URL, bytes.NewBuffer([]byte("")))
req.Header.Set("Content-Type", "application/json")
if c.User != "" && c.Password != "" {
req.SetBasicAuth(c.User, c.Password)
}
if err != nil {
return result, err
}
if c.Headers != nil {
for key, header := range c.Headers {
req.Header.Add(key, strings.Join(header, ", "))
}
}
result.Times = c.doChecks(req)
return c.conclude(result), nil
}
// doChecks executes req using c.Client and returns each attempt.
func (c TronChecker) doChecks(req *http.Request) Attempts {
checks := make(Attempts, c.Attempts)
for i := 0; i < c.Attempts; i++ {
start := time.Now()
resp, err := c.Client.Do(req)
checks[i].RTT = time.Since(start)
if err != nil {
checks[i].Error = err.Error()
continue
}
err = c.checkDown(resp)
if err != nil {
checks[i].Error = err.Error()
}
resp.Body.Close()
if c.AttemptSpacing > 0 {
time.Sleep(c.AttemptSpacing)
}
}
return checks
}
// conclude takes the data in result from the attempts and
// computes remaining values needed to fill out the result.
// It detects degraded (high-latency) responses and makes
// the conclusion about the result's status.
func (c TronChecker) conclude(result Result) Result {
result.ThresholdRTT = c.ThresholdRTT
// Check errors (down)
for i := range result.Times {
if result.Times[i].Error != "" {
result.Down = true
result.Message = result.Times[i].Error
return result
}
}
// Check round trip time (degraded)
if c.ThresholdRTT > 0 {
stats := result.ComputeStats()
if stats.Median > c.ThresholdRTT {
result.Notice = fmt.Sprintf("median round trip time exceeded threshold (%s)", c.ThresholdRTT)
result.Degraded = true
return result
}
}
result.Healthy = true
return result
}
// checkDown checks whether the endpoint is down based on resp and
// the configuration of c. It returns a non-nil error if down.
// Note that it does not check for degraded response.
func (c TronChecker) checkDown(resp *http.Response) error {
// Check status code
if resp.StatusCode != c.UpStatus {
return fmt.Errorf("response status %s", resp.Status)
}
bodyBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("reading response body: %v", err)
}
// parse blockheight
var checkresult = new(Block)
err = json.Unmarshal(bodyBytes, &checkresult)
if err != nil {
return err
}
//now := time.Now().UnixNano()
//then := checkresult.GetTimestamp()
//log.Printf("url:%s last block BlockHeight:%d\n", c.URL, checkresult.GetBlockHeight())
//i, _ := strconv.ParseInt(timestamp.(string), 10, 64)
//log.Printf("%d", i)
//["block_header"]["raw_data"]["number"]
/* https://developers.tron.network/reference#wallet-getnowblock
curl -X POST https://api.trongrid.io/wallet/getnowblock
{
"block": [
{
"block_header": {
"raw_data": {
"timestamp": 1552949766000,
"txTrieRoot": "d9b24867ce1b1134e033701addfdeca4f5f17d4d0ed8ff9e684a2ff16ba68629",
"parentHash": "0000000000741b9d468ba7f17caf68490d91f94794652466e8eb187fc168a9ee",
"number": 7609246,
"witness_address": "41beab998551416b02f6721129bb01b51fceceba08",
"version": 7
*/
var responsebody []byte
url := "https://api.trongrid.io/wallet/getnowblock"
if c.ReferURL != "" {
log.Printf("TRON(%s) height ReferURL:%s\n", c.Name, c.ReferURL)
url = c.ReferURL
}
responsebodyStr := utils.GlobalCacheGetString(url)
if responsebodyStr == "" {
client := &http.Client{}
req, err := http.NewRequest("POST", url, bytes.NewBuffer([]byte("")))
req.Header.Set("Content-Type", "application/json")
res, err := client.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
responsebody, err = ioutil.ReadAll(res.Body)
if err != nil {
return err
}
str := string(responsebody[:])
utils.GlobalCacheSetString(url, str)
} else {
log.Printf("TRON(%s) use cache key: %s", c.Name, url)
responsebody = []byte(responsebodyStr)
}
var tronresult = new(Block)
err = json.Unmarshal(responsebody, &tronresult)
if err != nil {
return err
}
log.Printf("%s, %s BlockHeight:%d, check url:%s last block BlockHeight:%d\n", c.Name, url, tronresult.GetBlockHeight(), c.URL, checkresult.GetBlockHeight())
lastTronBlockNum := tronresult.GetBlockHeight()
lastTronCheckBlockNum := checkresult.GetBlockHeight()
blockDiff := lastTronBlockNum - lastTronCheckBlockNum
if (lastTronBlockNum > lastTronCheckBlockNum) && (blockDiff > int64(c.BlockHeightBehind)) {
return fmt.Errorf("%s blockheight(%d) was behind trongrid %s (%d) > %d blocks, threshold(%d)", c.Name, lastTronCheckBlockNum, url, lastTronBlockNum, blockDiff, c.BlockHeightBehind)
}
return nil
}