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calculating.go
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calculating.go
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package actions
import (
"encoding/json"
"fmt"
"github.com/ottogroup/penelope/pkg/builder"
"github.com/ottogroup/penelope/pkg/repository"
"github.com/ottogroup/penelope/pkg/requestobjects"
"go.opencensus.io/trace"
"io/ioutil"
"net/http"
)
type CalculateBackupHandler struct {
processorBuilder *builder.ProcessorBuilder
}
func NewCalculateBackupHandler(processorBuilder *builder.ProcessorBuilder) *CalculateBackupHandler {
return &CalculateBackupHandler{processorBuilder: processorBuilder}
}
// ServeHTTP will handle Calculating operation
func (dl *CalculateBackupHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx, span := trace.StartSpan(r.Context(), "CalculateBackupHandler.ServeHTTP")
defer span.End()
bodyBytes, err := ioutil.ReadAll(r.Body)
if !checkRequestBodyIsValid(w, err) {
return
}
var request requestobjects.CalculateRequest
err = json.Unmarshal(bodyBytes, &request)
body := string(bodyBytes)
if !checkParsingBodyIsValid(w, err, body) {
return
}
if !validateCancelRequest(w, request, body) {
return
}
principal, isValid := getPrincipalOrElsePrepareFailedResponse(w, r)
if !isValid {
return
}
// business logic
processor, err := dl.processorBuilder.ProcessorForRequestType(ctx, requestobjects.Calculating)
if err != nil {
logMsg := fmt.Sprintf("Error creating new backup processor. Err: %s", err)
respMsg := "Could not handle request"
prepareResponse(w, logMsg, respMsg, http.StatusInternalServerError)
return
}
processorArguments := dl.processorBuilder.ProcessorArgumentsForRequest(&request, principal)
result, err := processor.Process(ctx, &processorArguments)
if err != nil {
logMsg := fmt.Sprintf("Error creating processing backup entity. Err: %s", err)
errMsg := fmt.Sprintf("could not handle request because of: %s", err)
prepareResponse(w, logMsg, errMsg, http.StatusPreconditionFailed)
return
}
responseBody, err := json.Marshal(result.CalculateResponse)
if err != nil {
logMsg := fmt.Sprintf("Error creating response body. Err: %s", err)
respMsg := "Could not handle request"
prepareResponse(w, logMsg, respMsg, http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
_, err = w.Write(responseBody)
if err != nil {
logMsg := fmt.Sprintf("Error creating response body. Err: %s", err)
respMsg := "Could not handle request"
prepareResponse(w, logMsg, respMsg, http.StatusInternalServerError)
return
}
}
func validateCancelRequest(w http.ResponseWriter, request requestobjects.CalculateRequest, body string) bool {
if !checkMandatoryFieldsAreSet(w, getUnsetMandatoryFieldsForCalculateRequest(request), body) {
return false
}
if !checkStrategyIsValid(w, request.Strategy, body) {
return false
}
if !checkTypeIsValid(w, request.Type, body) {
return false
}
if !checkRegionIsValid(w, request.TargetOptions.Region, body) {
return false
}
if !checkStorageClassIsValid(w, request.TargetOptions.StorageClass, body) {
return false
}
if !checkSourceOptionsAreValidForCalculateRequest(w, request) {
return false
}
return true
}
func getUnsetMandatoryFieldsForCalculateRequest(request requestobjects.CalculateRequest) []string {
var unsetMandatoryFields []string
if request.TargetOptions.Region == "" {
unsetMandatoryFields = append(unsetMandatoryFields, "region")
} else if request.Type == "" {
unsetMandatoryFields = append(unsetMandatoryFields, "type")
} else if request.Strategy == "" {
unsetMandatoryFields = append(unsetMandatoryFields, "strategy")
} else if request.Project == "" {
unsetMandatoryFields = append(unsetMandatoryFields, "project")
}
return unsetMandatoryFields
}
func checkSourceOptionsAreValidForCalculateRequest(w http.ResponseWriter, request requestobjects.CalculateRequest) bool {
if repository.BigQuery.EqualTo(request.Type) && request.BigQueryOptions.Dataset == "" {
logMsg := "Error bigquery backup type missing mandatory dataset field"
respMsg := "Missing mandatory bigquery dataset name"
prepareResponse(w, logMsg, respMsg, http.StatusBadRequest)
return false
} else if repository.CloudStorage.EqualTo(request.Type) && request.GCSOptions.Bucket == "" {
logMsg := "Error cloudstorage backup type missing mandatory bucket field"
respMsg := "Missing mandatory cloudstorage bucket name"
prepareResponse(w, logMsg, respMsg, http.StatusBadRequest)
return false
}
return true
}