J. David Lee
1d3cc1f959
Co-authored-by: jdl <jdl@desktop> Co-authored-by: jdl <jdl@crumpington.com> Reviewed-on: #3
111 lines
2.1 KiB
Go
111 lines
2.1 KiB
Go
package peer
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import (
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"encoding/json"
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"io"
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"log"
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"net/http"
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"net/url"
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"time"
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"vppn/m"
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)
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type hubPoller struct {
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client *http.Client
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req *http.Request
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versions [256]int64
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localIP byte
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netName string
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handleControlMsg func(fromIP byte, msg any)
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}
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func newHubPoller(
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localIP byte,
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netName,
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hubURL,
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apiKey string,
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handleControlMsg func(byte, any),
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) (*hubPoller, error) {
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u, err := url.Parse(hubURL)
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if err != nil {
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return nil, err
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}
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u.Path = "/peer/fetch-state/"
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client := &http.Client{Timeout: 8 * time.Second}
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req := &http.Request{
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Method: http.MethodGet,
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URL: u,
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Header: http.Header{},
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}
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req.SetBasicAuth("", apiKey)
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return &hubPoller{
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client: client,
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req: req,
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localIP: localIP,
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netName: netName,
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handleControlMsg: handleControlMsg,
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}, nil
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}
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func (hp *hubPoller) logf(s string, args ...any) {
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log.Printf("[HubPoller] "+s, args...)
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}
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func (hp *hubPoller) Run() {
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state, err := loadNetworkState(hp.netName)
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if err != nil {
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hp.logf("Failed to load network state: %v", err)
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hp.logf("Polling hub...")
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hp.pollHub()
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} else {
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hp.applyNetworkState(state)
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}
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for range time.Tick(64 * time.Second) {
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hp.pollHub()
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}
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}
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func (hp *hubPoller) pollHub() {
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var state m.NetworkState
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resp, err := hp.client.Do(hp.req)
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if err != nil {
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hp.logf("Failed to fetch peer state: %v", err)
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return
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}
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body, err := io.ReadAll(resp.Body)
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_ = resp.Body.Close()
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if err != nil {
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hp.logf("Failed to read body from hub: %v", err)
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return
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}
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if err := json.Unmarshal(body, &state); err != nil {
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hp.logf("Failed to unmarshal response from hub: %v\n%s", err, body)
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return
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}
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hp.applyNetworkState(state)
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if err := storeNetworkState(hp.netName, state); err != nil {
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hp.logf("Failed to store network state: %v", err)
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}
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}
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func (hp *hubPoller) applyNetworkState(state m.NetworkState) {
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for i, peer := range state.Peers {
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if i != int(hp.localIP) {
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if peer == nil || peer.Version != hp.versions[i] {
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hp.handleControlMsg(byte(i), peerUpdateMsg{Peer: state.Peers[i]})
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if peer != nil {
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hp.versions[i] = peer.Version
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}
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}
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}
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}
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}
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