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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "time" | ||
|
|
||
| tz "github.com/ecadlabs/gotez/v2" | ||
| ) | ||
|
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| type Config struct { | ||
| Listen string `yaml:"listen"` | ||
| URL string `yaml:"url"` | ||
| ChainID *tz.ChainID `yaml:"chain_id"` | ||
| Timeout time.Duration `yaml:"timeout"` | ||
| Tolerance time.Duration `yaml:"tolerance"` | ||
| ReconnectDelay time.Duration `yaml:"reconnect_delay"` | ||
| UseTimestamps bool `yaml:"use_timestamps"` | ||
| CheckBlockDelay bool `yaml:"check_block_delay"` | ||
| CheckBootstrapped bool `yaml:"check_bootstrapped"` | ||
| CheckSyncState bool `yaml:"check_sync_state"` | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| listen: :8080 | ||
| url: http://ghostnet.ecadinfra.com:8080 | ||
| chain_id: NetXnHfVqm9iesp |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| package main | ||
|
|
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| import ( | ||
| "context" | ||
| "time" | ||
|
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| tz "github.com/ecadlabs/gotez/v2" | ||
| "github.com/ecadlabs/gotez/v2/client" | ||
| log "github.com/sirupsen/logrus" | ||
| ) | ||
|
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| type HealthChecker struct { | ||
| Monitor *HeadMonitor | ||
| Client *client.Client | ||
| ChainID *tz.ChainID | ||
| Timeout time.Duration | ||
|
|
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| CheckBlockDelay bool | ||
| CheckBootstrapped bool | ||
| CheckSyncState bool | ||
| } | ||
|
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| type HealthStatus struct { | ||
| IsBootstrapped bool `json:"bootstrapped"` | ||
| IsSynced bool `json:"synced"` | ||
| BlockDelayOk bool `json:"block_delay_ok"` | ||
| } | ||
|
|
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| func (h *HealthChecker) HealthStatus(ctx context.Context) (*HealthStatus, bool, error) { | ||
| var status HealthStatus | ||
| ok := true | ||
| if h.CheckBootstrapped || h.CheckSyncState { | ||
| c, cancel := context.WithTimeout(ctx, h.Timeout) | ||
| defer cancel() | ||
| resp, err := h.Client.IsBootstrapped(c, h.ChainID) | ||
| if err != nil { | ||
| return nil, false, err | ||
| } | ||
| if h.CheckBootstrapped { | ||
| status.IsBootstrapped = resp.Bootstrapped | ||
| ok = ok && status.IsBootstrapped | ||
| } | ||
| if h.CheckSyncState { | ||
| status.IsSynced = resp.SyncState == client.SyncStateSynced | ||
| ok = ok && status.IsSynced | ||
| } | ||
| } | ||
| if h.CheckBlockDelay { | ||
| status.BlockDelayOk = h.Monitor.Status() | ||
| ok = ok && status.BlockDelayOk | ||
| } | ||
|
|
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| if !ok { | ||
| log.WithFields(log.Fields{ | ||
| "chain_id": h.ChainID, | ||
| "bootstrapped": status.IsBootstrapped, | ||
| "synced": status.IsSynced, | ||
| "block_delay_ok": status.BlockDelayOk, | ||
| }).Warn("Chain health is not ok") | ||
| } | ||
| return &status, ok, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| package main | ||
|
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| // Logging middleware inspired by github.com/urfave/negroni | ||
|
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| import ( | ||
| "net/http" | ||
| "time" | ||
|
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| log "github.com/sirupsen/logrus" | ||
| ) | ||
|
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| func (rw *responseWriter) Status() int { | ||
| return rw.status | ||
| } | ||
|
|
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| func (rw *responseWriter) WriteHeader(s int) { | ||
| rw.status = s | ||
| rw.ResponseWriter.WriteHeader(s) | ||
| } | ||
|
|
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| func (rw *responseWriter) Write(data []byte) (int, error) { | ||
| if rw.status == 0 { | ||
| rw.status = http.StatusOK | ||
| } | ||
|
|
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| return rw.ResponseWriter.Write(data) | ||
| } | ||
|
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| var _ http.ResponseWriter = &responseWriter{} | ||
| var _ http.ResponseWriter = &responseWriterHijacker{} | ||
| var _ http.Hijacker = &responseWriterHijacker{} | ||
|
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| // ResponseStatusWriter wraps http.ResponseWriter to save HTTP status code | ||
| type ResponseStatusWriter interface { | ||
| http.ResponseWriter | ||
| Status() int | ||
| } | ||
|
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| type responseWriter struct { | ||
| http.ResponseWriter | ||
| status int | ||
| } | ||
|
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| type responseWriterHijacker struct { | ||
| *responseWriter | ||
| http.Hijacker | ||
| } | ||
|
|
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| func newResponseStatusWriter(w http.ResponseWriter) ResponseStatusWriter { | ||
| ret := &responseWriter{ | ||
| ResponseWriter: w, | ||
| } | ||
|
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| if h, ok := w.(http.Hijacker); ok { | ||
| return &responseWriterHijacker{ | ||
| responseWriter: ret, | ||
| Hijacker: h, | ||
| } | ||
| } | ||
|
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| return ret | ||
| } | ||
|
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| // Logging is a logrus-enabled logging middleware | ||
| type Logging struct { | ||
| Logger *log.Logger | ||
| } | ||
|
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| func (l *Logging) log() *log.Logger { | ||
| if l.Logger != nil { | ||
| return l.Logger | ||
| } | ||
| return log.StandardLogger() | ||
| } | ||
|
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| // Handler wraps provided http.Handler with middleware | ||
| func (l *Logging) Handler(h http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| timestamp := time.Now() | ||
|
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| rw := newResponseStatusWriter(w) | ||
| h.ServeHTTP(rw, r) | ||
|
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| fields := log.Fields{ | ||
| "start_time": timestamp.Format(time.RFC3339), | ||
| "duration": time.Since(timestamp), | ||
| "status": rw.Status(), | ||
| "hostname": r.Host, | ||
| "method": r.Method, | ||
| "path": r.URL.Path, | ||
| } | ||
|
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| l.log().WithFields(fields).Println(r.Method + " " + r.URL.Path) | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "net/http" | ||
| "os" | ||
| "os/signal" | ||
| "time" | ||
|
|
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| "flag" | ||
|
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| "github.com/ecadlabs/gotez/v2/client" | ||
| "github.com/gorilla/mux" | ||
| log "github.com/sirupsen/logrus" | ||
| "golang.org/x/sys/unix" | ||
| "gopkg.in/yaml.v3" | ||
| ) | ||
|
|
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| const ( | ||
| defaultListen = ":8080" | ||
| defaultTimeout = 30 * time.Second | ||
| defaultTolerance = 1 * time.Second | ||
| defaultReconnectDelay = 10 * time.Second | ||
| ) | ||
|
|
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| func main() { | ||
| logLevel := flag.String("l", "info", "Log level: [error, warn, info, debug, trace]") | ||
| confPath := flag.String("c", "", "Config file path") | ||
| flag.Parse() | ||
|
|
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| ll, err := log.ParseLevel(*logLevel) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| log.SetLevel(ll) | ||
|
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| conf := Config{ | ||
| Listen: defaultListen, | ||
| Timeout: defaultTimeout, | ||
| Tolerance: defaultTolerance, | ||
| ReconnectDelay: defaultReconnectDelay, | ||
| CheckBlockDelay: true, | ||
| CheckBootstrapped: true, | ||
| CheckSyncState: true, | ||
| } | ||
|
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| buf, err := os.ReadFile(*confPath) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| if err := yaml.Unmarshal(buf, &conf); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
|
|
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| cl := client.Client{ | ||
| URL: conf.URL, | ||
| } | ||
|
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| mon := HeadMonitor{ | ||
| Client: &cl, | ||
| ChainID: conf.ChainID, | ||
| Timeout: conf.Timeout, | ||
| Tolerance: conf.Tolerance, | ||
| ReconnectDelay: conf.ReconnectDelay, | ||
| UseTimestamps: conf.UseTimestamps, | ||
| } | ||
| checker := HealthChecker{ | ||
| Monitor: &mon, | ||
| Client: &cl, | ||
| ChainID: conf.ChainID, | ||
| Timeout: conf.Timeout, | ||
| CheckBlockDelay: conf.CheckBlockDelay, | ||
| CheckBootstrapped: conf.CheckBootstrapped, | ||
| CheckSyncState: conf.CheckSyncState, | ||
| } | ||
| if conf.CheckBlockDelay { | ||
| mon.Start() | ||
| defer mon.Stop(context.Background()) | ||
| } | ||
|
|
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| r := mux.NewRouter() | ||
| r.Methods("GET").Path("/health").HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| status, ok, err := checker.HealthStatus(r.Context()) | ||
| if err != nil { | ||
| w.WriteHeader(http.StatusInternalServerError) | ||
| fmt.Fprintf(w, "%v", err) | ||
| return | ||
| } | ||
| var code int | ||
| if ok { | ||
| code = http.StatusOK | ||
| } else { | ||
| code = http.StatusInternalServerError | ||
| } | ||
| w.Header().Set("Content-Type", "application/json; charset=utf-8") | ||
| w.WriteHeader(code) | ||
| json.NewEncoder(w).Encode(status) | ||
| }) | ||
| r.Use((&Logging{}).Handler) | ||
|
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| srv := &http.Server{ | ||
| Handler: r, | ||
| Addr: conf.Listen, | ||
| } | ||
| go func() { | ||
| log.Infof("Listening on %s", conf.Listen) | ||
| srv.ListenAndServe() | ||
| }() | ||
|
|
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| c := make(chan os.Signal, 1) | ||
| signal.Notify(c, unix.SIGINT, unix.SIGTERM) | ||
| <-c | ||
|
|
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| srv.Shutdown(context.Background()) | ||
| } |
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