kopia lustrzana https://github.com/bugout-dev/moonstream
280 wiersze
6.4 KiB
Go
280 wiersze
6.4 KiB
Go
/*
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Load balancer logic.
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*/
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package main
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import (
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"bytes"
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"encoding/json"
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"io/ioutil"
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"log"
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"net/http"
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"net/http/httputil"
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"net/url"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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)
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// Main variable of pool of blockchains which contains pool of nodes
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// for each blockchain we work during session.
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var blockchainPools map[string]*NodePool
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// Node structure with
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// Endpoint for geth/bor/etc node http.server endpoint
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type Node struct {
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Endpoint *url.URL
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Alive bool
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CurrentBlock uint64
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CallCounter uint64
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mux sync.RWMutex
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GethReverseProxy *httputil.ReverseProxy
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}
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type TopNodeBlock struct {
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Block uint64
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Node *Node
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}
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type NodePool struct {
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NodesMap map[string][]*Node
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NodesSet []*Node
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TopNode TopNodeBlock
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}
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// Node status response struct for HealthCheck
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type NodeStatusResultResponse struct {
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Number string `json:"number"`
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}
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type NodeStatusResponse struct {
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Result NodeStatusResultResponse `json:"result"`
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}
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// AddNode to the nodes pool
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func AddNode(blockchain string, tags []string, node *Node) {
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if blockchainPools == nil {
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blockchainPools = make(map[string]*NodePool)
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}
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if blockchainPools[blockchain] == nil {
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blockchainPools[blockchain] = &NodePool{}
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}
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if blockchainPools[blockchain].NodesMap == nil {
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blockchainPools[blockchain].NodesMap = make(map[string][]*Node)
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}
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blockchainPools[blockchain].NodesSet = append(blockchainPools[blockchain].NodesSet, node)
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for _, tag := range tags {
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blockchainPools[blockchain].NodesMap[tag] = append(
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blockchainPools[blockchain].NodesMap[tag],
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node,
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)
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}
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}
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// SetAlive with mutex for exact node
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func (node *Node) SetAlive(alive bool) {
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node.mux.Lock()
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node.Alive = alive
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node.mux.Unlock()
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}
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// IsAlive returns true when node is alive
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func (node *Node) IsAlive() (alive bool) {
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node.mux.RLock()
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alive = node.Alive
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node.mux.RUnlock()
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return alive
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}
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// UpdateNodeState updates block number and live status,
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// also it returns number of time node appeal
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func (node *Node) UpdateNodeState(currentBlock uint64, alive bool) (callCounter uint64) {
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node.mux.Lock()
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node.CurrentBlock = currentBlock
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node.Alive = alive
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callCounter = node.CallCounter
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node.mux.Unlock()
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return callCounter
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}
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// IncreaseCallCounter increased to 1 each time node called
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func (node *Node) IncreaseCallCounter() {
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node.mux.Lock()
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if node.CallCounter >= NB_MAX_COUNTER_NUMBER {
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log.Printf("Number of calls for node %s reached %d limit, reset the counter.", node.Endpoint, NB_MAX_COUNTER_NUMBER)
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node.CallCounter = uint64(0)
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} else {
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node.CallCounter++
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}
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node.mux.Unlock()
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}
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func containsGeneric[T comparable](b []T, e T) bool {
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for _, v := range b {
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if v == e {
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return true
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}
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}
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return false
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}
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func (npool *NodePool) FilterTagsNodes(tags []string) ([]*Node, TopNodeBlock) {
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nodesMap := npool.NodesMap
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nodesSet := npool.NodesSet
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tagSet := make(map[string]map[*Node]bool)
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for tag, nodes := range nodesMap {
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if tagSet[tag] == nil {
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tagSet[tag] = make(map[*Node]bool)
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}
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for _, node := range nodes {
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tagSet[tag][node] = true
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}
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}
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topNode := TopNodeBlock{}
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var filteredNodes []*Node
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for _, node := range nodesSet {
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accept := true
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for _, tag := range tags {
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if tagSet[tag][node] != true {
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accept = false
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break
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}
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}
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if accept {
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filteredNodes = append(filteredNodes, node)
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currentBlock := node.CurrentBlock
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if currentBlock >= npool.TopNode.Block {
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topNode.Block = currentBlock
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topNode.Node = node
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}
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}
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}
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return filteredNodes, topNode
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}
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// GetNextNode returns next active peer to take a connection
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// Loop through entire nodes to find out an alive one and chose one with small CallCounter
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func GetNextNode(nodes []*Node, topNode TopNodeBlock) *Node {
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nextNode := topNode.Node
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for _, node := range nodes {
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if node.IsAlive() {
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currentBlock := node.CurrentBlock
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if currentBlock < topNode.Block-NB_HIGHEST_BLOCK_SHIFT {
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// Bypass outdated nodes
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continue
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}
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if node.CallCounter < nextNode.CallCounter {
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nextNode = node
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}
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}
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}
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if nextNode == nil {
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return nil
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}
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// Increase CallCounter value with 1
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atomic.AddUint64(&nextNode.CallCounter, uint64(1))
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return nextNode
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}
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// SetNodeStatus modify status of the node
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func SetNodeStatus(url *url.URL, alive bool) {
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for _, nodes := range blockchainPools {
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for _, n := range nodes.NodesSet {
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if n.Endpoint.String() == url.String() {
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n.SetAlive(alive)
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break
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}
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}
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}
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}
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// StatusLog logs node status
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// TODO(kompotkot): Print list of alive and dead nodes
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func StatusLog() {
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for blockchain, nodes := range blockchainPools {
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for _, n := range nodes.NodesSet {
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log.Printf(
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"Blockchain %s node %s is alive %t",
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blockchain, n.Endpoint.Host, n.Alive,
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)
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}
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}
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}
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// HealthCheck fetch the node latest block
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func HealthCheck() {
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for blockchain, nodes := range blockchainPools {
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for _, n := range nodes.NodesSet {
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alive := false
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httpClient := http.Client{Timeout: NB_HEALTH_CHECK_CALL_TIMEOUT}
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resp, err := httpClient.Post(
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n.Endpoint.String(),
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"application/json",
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bytes.NewBuffer([]byte(`{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["latest", false],"id":1}`)),
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)
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if err != nil {
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n.UpdateNodeState(0, alive)
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log.Printf("Unable to reach node: %s", n.Endpoint.Host)
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continue
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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n.UpdateNodeState(0, alive)
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log.Printf("Unable to parse response from %s node, err %v", n.Endpoint.Host, err)
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continue
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}
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var statusResponse NodeStatusResponse
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err = json.Unmarshal(body, &statusResponse)
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if err != nil {
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n.UpdateNodeState(0, alive)
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log.Printf("Unable to read json response from %s node, err: %v", n.Endpoint.Host, err)
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continue
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}
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blockNumberHex := strings.Replace(statusResponse.Result.Number, "0x", "", -1)
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blockNumber, err := strconv.ParseUint(blockNumberHex, 16, 64)
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if err != nil {
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n.UpdateNodeState(0, alive)
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log.Printf("Unable to parse block number from hex to string, err: %v", err)
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continue
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}
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// Mark node in list of pool as alive and update current block
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if blockNumber != 0 {
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alive = true
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}
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callCounter := n.UpdateNodeState(blockNumber, alive)
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if blockNumber > nodes.TopNode.Block {
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nodes.TopNode.Block = blockNumber
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nodes.TopNode.Node = n
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}
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log.Printf(
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"In blockchain %s node %s is alive: %t with current block: %d called: %d times", blockchain, n.Endpoint.Host, alive, blockNumber, callCounter,
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)
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}
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}
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}
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