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Add read-write, read-only and primary routes

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This commit is contained in:
Julien Riou 2019-08-16 19:11:27 +02:00
commit ccf95c6f86
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GPG key ID: 5061AE6DCA7C6B50
3 changed files with 54 additions and 3 deletions
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39
src/frontend.go
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@ -34,7 +34,10 @@ func (f *Frontend) Start() error {
Debug("registering routes")
r.HandleFunc("/health", HealthHandler).Methods("GET")
r.HandleFunc("/master", PrimaryHandler).Methods("GET", "OPTIONS")
r.HandleFunc("/primary", PrimaryHandler).Methods("GET", "OPTIONS")
r.HandleFunc("/read-write", ReadWriteHandler).Methods("GET", "OPTIONS")
r.HandleFunc("/replica", ReplicaHandler).Methods("GET", "OPTIONS")
r.HandleFunc("/read-only", ReadOnlyHandler).Methods("GET", "OPTIONS")
Info("listening on %s", f)
var err error
@ -148,6 +151,24 @@ func PrimaryHandler(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, message)
}
// ReadWriteHandler exposes read-write status
func ReadWriteHandler(w http.ResponseWriter, r *http.Request) {
var message string
var status int
readWrite, err := backend.IsReadWrite()
if err != nil {
message = fmt.Sprintf("{\"error\":\"%v\"}", err)
status = http.StatusServiceUnavailable
}
message = fmt.Sprintf("{\"read-write\":%t}", readWrite)
status = http.StatusServiceUnavailable
if readWrite {
status = http.StatusOK
}
w.WriteHeader(status)
io.WriteString(w, message)
}
// ReplicaHandler exposes replica status
func ReplicaHandler(w http.ResponseWriter, r *http.Request) {
var message string
@ -166,6 +187,24 @@ func ReplicaHandler(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, message)
}
// ReadOnlyHandler exposes read-only status
func ReadOnlyHandler(w http.ResponseWriter, r *http.Request) {
var message string
var status int
readOnly, err := backend.IsReadOnly()
if err != nil {
message = fmt.Sprintf("{\"error\":\"%v\"}", err)
status = http.StatusServiceUnavailable
}
message = fmt.Sprintf("{\"read-only\":%t}", readOnly)
status = http.StatusServiceUnavailable
if readOnly {
status = http.StatusOK
}
w.WriteHeader(status)
io.WriteString(w, message)
}
// Store TLS ciphers map from string to constant
// See full list at https://golang.org/pkg/crypto/tls/#pkg-constants
var tlsCiphers = map[string]uint16{