Created
May 29, 2020 08:32
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Echo handle store in Raft: https://github.com/yusufsyaifudin/raft-sample/blob/48254d0c71/server/store_handler/handler_store.go#L22-L74
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| package store_handler | |
| import ( | |
| "encoding/json" | |
| "fmt" | |
| "github.com/hashicorp/raft" | |
| "github.com/labstack/echo/v4" | |
| "net/http" | |
| "strings" | |
| "time" | |
| "ysf/raftsample/fsm" | |
| ) | |
| // requestStore payload for storing new data in raft cluster | |
| type requestStore struct { | |
| Key string `json:"key"` | |
| Value interface{} `json:"value"` | |
| } | |
| // Store handling save to raft cluster. Store will invoke raft.Apply to make this stored in all cluster | |
| // with acknowledge from n quorum. Store must be done in raft leader, otherwise return error. | |
| func (h handler) Store(eCtx echo.Context) error { | |
| var form = requestStore{} | |
| if err := eCtx.Bind(&form); err != nil { | |
| return eCtx.JSON(http.StatusUnprocessableEntity, map[string]interface{}{ | |
| "error": fmt.Sprintf("error binding: %s", err.Error()), | |
| }) | |
| } | |
| form.Key = strings.TrimSpace(form.Key) | |
| if form.Key == "" { | |
| return eCtx.JSON(http.StatusUnprocessableEntity, map[string]interface{}{ | |
| "error": "key is empty", | |
| }) | |
| } | |
| if h.raft.State() != raft.Leader { | |
| return eCtx.JSON(http.StatusUnprocessableEntity, map[string]interface{}{ | |
| "error": "not the leader", | |
| }) | |
| } | |
| payload := fsm.CommandPayload{ | |
| Operation: "SET", | |
| Key: form.Key, | |
| Value: form.Value, | |
| } | |
| data, err := json.Marshal(payload) | |
| if err != nil { | |
| return eCtx.JSON(http.StatusUnprocessableEntity, map[string]interface{}{ | |
| "error": fmt.Sprintf("error preparing saving data payload: %s", err.Error()), | |
| }) | |
| } | |
| applyFuture := h.raft.Apply(data, 500*time.Millisecond) | |
| if err := applyFuture.Error(); err != nil { | |
| return eCtx.JSON(http.StatusUnprocessableEntity, map[string]interface{}{ | |
| "error": fmt.Sprintf("error persisting data in raft cluster: %s", err.Error()), | |
| }) | |
| } | |
| _, ok := applyFuture.Response().(*fsm.ApplyResponse) | |
| if !ok { | |
| return eCtx.JSON(http.StatusUnprocessableEntity, map[string]interface{}{ | |
| "error": fmt.Sprintf("error response is not match apply response"), | |
| }) | |
| } | |
| return eCtx.JSON(http.StatusOK, map[string]interface{}{ | |
| "message": "success persisting data", | |
| "data": form, | |
| }) | |
| } |
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