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watchtower/pkg/api/api.go

64 lines
1.2 KiB
Go

package api
import (
"errors"
"io"
"net/http"
"os"
log "github.com/sirupsen/logrus"
)
var (
lock chan bool
)
func init() {
lock = make(chan bool, 1)
lock <- true
}
// SetupHTTPUpdates configures the endpoint needed for triggering updates via http
func SetupHTTPUpdates(apiToken string, updateFunction func()) error {
if apiToken == "" {
return errors.New("api token is empty or has not been set. not starting api")
}
log.Println("Watchtower HTTP API started.")
http.HandleFunc("/v1/update", func(w http.ResponseWriter, r *http.Request) {
log.Info("Updates triggered by HTTP API request.")
_, err := io.Copy(os.Stdout, r.Body)
if err != nil {
log.Println(err)
return
}
if r.Header.Get("Token") != apiToken {
log.Println("Invalid token. Not updating.")
return
}
log.Println("Valid token found. Attempting to update.")
select {
case chanValue := <-lock:
defer func() { lock <- chanValue }()
updateFunction()
default:
log.Debug("Skipped. Another update already running.")
}
})
return nil
}
// WaitForHTTPUpdates starts the http server and listens for requests.
func WaitForHTTPUpdates() error {
log.Fatal(http.ListenAndServe(":8080", nil))
os.Exit(0)
return nil
}