62 lines
1.5 KiB
Go
62 lines
1.5 KiB
Go
package metrics
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"github.com/google/uuid"
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"github.com/cloudflare/cloudflared/tunnelstate"
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)
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// ReadyServer serves HTTP 200 if the tunnel can serve traffic. Intended for k8s readiness checks.
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type ReadyServer struct {
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clientID uuid.UUID
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tracker *tunnelstate.ConnTracker
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}
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// NewReadyServer initializes a ReadyServer and starts listening for dis/connection events.
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func NewReadyServer(
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clientID uuid.UUID,
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tracker *tunnelstate.ConnTracker,
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) *ReadyServer {
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return &ReadyServer{
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clientID,
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tracker,
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}
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}
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type body struct {
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Status int `json:"status"`
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ReadyConnections uint `json:"readyConnections"`
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ConnectorID uuid.UUID `json:"connectorId"`
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}
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// ServeHTTP responds with HTTP 200 if the tunnel is connected to the edge.
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func (rs *ReadyServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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statusCode, readyConnections := rs.makeResponse()
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w.WriteHeader(statusCode)
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body := body{
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Status: statusCode,
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ReadyConnections: readyConnections,
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ConnectorID: rs.clientID,
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}
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msg, err := json.Marshal(body)
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if err != nil {
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_, _ = fmt.Fprintf(w, `{"error": "%s"}`, err)
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}
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_, _ = w.Write(msg)
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}
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// This is the bulk of the logic for ServeHTTP, broken into its own pure function
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// to make unit testing easy.
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func (rs *ReadyServer) makeResponse() (statusCode int, readyConnections uint) {
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readyConnections = rs.tracker.CountActiveConns()
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if readyConnections > 0 {
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return http.StatusOK, readyConnections
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} else {
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return http.StatusServiceUnavailable, readyConnections
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}
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}
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