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Roshan Patil authored6595953c
servicebuildermdl.go 11.81 KiB
//@author Ajit Jagtap//@version Mon Jul 09 2018 14:00:05 GMT+0530 (IST)// Package servicebuildermdl will help you run BL and fetch data.package servicebuildermdlimport ( "strings" "sync" "time" "corelab.mkcl.org/MKCLOS/coredevelopmentplatform/corepkgv2/validationmdl" "corelab.mkcl.org/MKCLOS/coredevelopmentplatform/corepkgv2/errormdl" "corelab.mkcl.org/MKCLOS/coredevelopmentplatform/corepkgv2/loggermdl" "github.com/oleksandr/conditions" "github.com/tidwall/gjson")var ruleCache map[string]conditions.Exprvar mutex = &sync.Mutex{}func init() { ruleCache = make(map[string]conditions.Expr)}// LoadData is a method sign for loader methodstype LoadData = func(ab *AbstractBusinessLogicHolder) error// FinalStepProcessOutput is a method sign for loader methodstype FinalStepProcessOutput = func(ab *AbstractBusinessLogicHolder) (*interface{}, error)// AbstractBusinessLogicHolder use this type to inheritancetype AbstractBusinessLogicHolder struct { localServiceData map[string]interface{} pricipalObject Principal}// GetDataString will give you stringfunc (ab *AbstractBusinessLogicHolder) GetDataString(key string) (string, bool) { //check in map temp, found := ab.localServiceData[key] if errormdl.CheckBool(!found) { return "", false } // cast it value, ok := temp.(string) if errormdl.CheckBool1(!ok) { return "", false } return value, true}// GetDataInt will give you intfunc (ab *AbstractBusinessLogicHolder) GetDataInt(key string) (int64, bool) { //check in map temp, found := ab.localServiceData[key] if errormdl.CheckBool(!found) { return 0, false } // cast it value, ok := temp.(int64) if errormdl.CheckBool1(!ok) { return 0, false } return value, true}// GetDataResultset will give you int7172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140
func (ab *AbstractBusinessLogicHolder) GetDataResultset(key string) (*gjson.Result, bool) {
//check in map
temp, found := ab.localServiceData[key]
if errormdl.CheckBool(!found) {
loggermdl.LogWarn("Key not found -", key)
return &gjson.Result{}, false
}
// cast it
value, ok := temp.(*gjson.Result)
if errormdl.CheckBool1(!ok) {
return &gjson.Result{}, false
}
return value, true
}
// GetDataBool will give you int
func (ab *AbstractBusinessLogicHolder) GetDataBool(key string) (bool, bool) {
//check in map
temp, found := ab.localServiceData[key]
if errormdl.CheckBool(!found) {
return false, false
}
// cast it
value, ok := temp.(bool)
if errormdl.CheckBool1(!ok) {
return false, false
}
return value, true
}
// GetCustomData will give you string
func (ab *AbstractBusinessLogicHolder) GetCustomData(key string) (interface{}, bool) {
//check in map
temp, found := ab.localServiceData[key]
if errormdl.CheckBool(!found) {
return 0, false
}
// cast it
return temp, true
}
// New will create memory for your data
func (ab *AbstractBusinessLogicHolder) New(principalObject *Principal) *AbstractBusinessLogicHolder {
ab.localServiceData = make(map[string]interface{})
ab.pricipalObject = *principalObject
return ab
}
// SetResultset will return map data with finaldata key
func (ab *AbstractBusinessLogicHolder) SetResultset(key string, obj *gjson.Result) {
ab.localServiceData[key] = obj
}
// SetByteData will set byte data as gjson.Result
func (ab *AbstractBusinessLogicHolder) SetByteData(key string, obj []byte) {
rs := gjson.ParseBytes(obj)
ab.localServiceData[key] = &rs
}
// SetCustomData set custom user data in map
func (ab *AbstractBusinessLogicHolder) SetCustomData(key string, data interface{}) {
ab.localServiceData[key] = data
}
// GetFinalData will return map data with finaldata key
func (ab *AbstractBusinessLogicHolder) GetFinalData() *interface{} {
a := ab.localServiceData["finaldata"]
return &a
}
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// SetFinalData will return map data with finaldata key
func (ab *AbstractBusinessLogicHolder) SetFinalData(data interface{}) {
ab.localServiceData["finaldata"] = data
}
// EchoBL sample EchoBL logic handler
func (ab *AbstractBusinessLogicHolder) EchoBL() (map[string]interface{}, error) {
// loggermdl.LogWarn("EchoBL called")
return map[string]interface{}{
"ok": int64(1),
}, nil
}
// Step help to maintain steps
type Step struct {
Stepname string
expr conditions.Expr
processDataFunc LoadData
IsValidator bool
ValidationDataKey string
ValidationFunc func(interface{}) error
RunFunc func() (map[string]interface{}, error)
ErrorFunc func() (map[string]interface{}, error)
JumpStep string
}
// ServiceBuilder will help you to run steps
type ServiceBuilder struct {
ServiceName string
steps []Step
businessLogicHolder *AbstractBusinessLogicHolder
ServiceError error
}
// GetSB Gives you service builder from where you can run steps
func GetSB(name string, ab *AbstractBusinessLogicHolder) *ServiceBuilder {
newsb := ServiceBuilder{}
newsb.ServiceName = name
newsb.businessLogicHolder = ab
return &newsb
}
// AddStep will add func step with rule
// Stepname : Give Name to step. It will appear in log.
// Rule : Give Ybl rule
// blfunc : Give Business Logic function pointer
// errorfunc : Give Error function pointer
func (sb *ServiceBuilder) AddStep(stepname, rule string, ld LoadData, blfunc, errorfunc func() (map[string]interface{}, error)) *ServiceBuilder {
if errormdl.CheckErr(sb.ServiceError) != nil {
loggermdl.LogError(sb.ServiceError)
return sb
}
step := Step{}
//Check rule in cache
mutex.Lock()
cachedRule, found := ruleCache[rule]
mutex.Unlock()
if errormdl.CheckBool(found) {
step.expr = cachedRule
} else {
// Parse the condition language and get expression
p := conditions.NewParser(strings.NewReader(rule))
expr, err := p.Parse()
if errormdl.CheckErr1(err) != nil {
loggermdl.LogError("Error in step: ", stepname, err)
sb.ServiceError = errormdl.CheckErr1(err)
return sb
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}
step.expr = expr
mutex.Lock()
ruleCache[rule] = expr
mutex.Unlock()
}
step.RunFunc = blfunc
step.ErrorFunc = errorfunc
step.Stepname = stepname
step.processDataFunc = ld
sb.steps = append(sb.steps, step)
return sb
}
// AddStepWithGoTo - AddStep with goto pointer
func (sb *ServiceBuilder) AddStepWithGoTo(stepname, rule string, ld LoadData, blfunc, errorfunc func() (map[string]interface{}, error), gotoStepName string) *ServiceBuilder {
if errormdl.CheckErr(sb.ServiceError) != nil {
loggermdl.LogError(sb.ServiceError)
return sb
}
step := Step{}
//Check rule in cache
mutex.Lock()
cachedRule, found := ruleCache[rule]
mutex.Unlock()
if errormdl.CheckBool(found) {
step.expr = cachedRule
} else {
// Parse the condition language and get expression
p := conditions.NewParser(strings.NewReader(rule))
expr, err := p.Parse()
if errormdl.CheckErr1(err) != nil {
loggermdl.LogError("Error in step: ", stepname, err)
sb.ServiceError = errormdl.CheckErr1(err)
return sb
}
step.expr = expr
mutex.Lock()
ruleCache[rule] = expr
mutex.Unlock()
}
step.RunFunc = blfunc
step.ErrorFunc = errorfunc
step.Stepname = stepname
step.processDataFunc = ld
step.JumpStep = gotoStepName
sb.steps = append(sb.steps, step)
return sb
}
// AddValidation add validation step for give dataKey
func (sb *ServiceBuilder) AddValidation(dataKey string, validationfunc func(interface{}) error) *ServiceBuilder {
if errormdl.CheckErr(sb.ServiceError) != nil {
loggermdl.LogError(sb.ServiceError)
return sb
}
step := Step{}
step.IsValidator = true
step.ValidationDataKey = dataKey
step.ValidationFunc = validationfunc
step.Stepname = "Validation Step"
sb.steps = append(sb.steps, step)
return sb
}
func (sb *ServiceBuilder) findStepIndex(stepName string) (int, bool) {
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for i, step := range sb.steps {
if step.Stepname == stepName {
return i, true
}
}
return 0, false
}
// Run all Steps one by one
func (sb *ServiceBuilder) Run(fn FinalStepProcessOutput) (*interface{}, error) {
if errormdl.CheckErr(sb.ServiceError) != nil {
loggermdl.LogError(sb.ServiceError)
return nil, errormdl.CheckErr(sb.ServiceError)
}
_, ok := sb.businessLogicHolder.localServiceData["finaldata"]
if ok {
return sb.businessLogicHolder.GetFinalData(), nil
}
maxStepCount := 100
for i := 0; i < len(sb.steps); i++ {
if maxStepCount == 0 {
loggermdl.LogError("Your steps are in recursion and cross limit of 100 steps")
return nil, errormdl.Wrap("Your steps are in recursion and cross limit of 100 steps")
}
maxStepCount--
// Validation
if sb.steps[i].IsValidator {
validationError := sb.executeValidationFunction(sb.steps[i].ValidationDataKey, sb.steps[i].ValidationFunc)
if errormdl.CheckErr(validationError) != nil {
return nil, errormdl.CheckErr(validationError)
}
continue
}
//Load Data
if sb.steps[i].processDataFunc != nil {
daoError := sb.steps[i].processDataFunc(sb.businessLogicHolder)
if errormdl.CheckErr1(daoError) != nil {
loggermdl.LogError(daoError)
return nil, errormdl.CheckErr1(daoError)
}
}
//Run step func
tmp, blError := sb.steps[i].RunFunc()
if errormdl.CheckErr2(blError) != nil {
loggermdl.LogError(blError)
return nil, errormdl.CheckErr2(blError)
}
// Validation using conditions
result, evaluteError := conditions.Evaluate(sb.steps[i].expr, tmp)
if errormdl.CheckErr3(evaluteError) != nil {
loggermdl.LogError(evaluteError)
return nil, errormdl.CheckErr3(evaluteError)
}
// if validation fails
if !result {
// loggermdl.LogWarn(sb.steps[i].Stepname, "Failed", result)
// jump step is a functionality like go to on particular step
if sb.steps[i].JumpStep != "" {
_, recoveryError := sb.executeErrorFunction(sb.steps[i].ErrorFunc)
if errormdl.CheckErr(recoveryError) != nil {
loggermdl.LogError(recoveryError)
return nil, errormdl.CheckErr(recoveryError)
}
index, ok := sb.findStepIndex(sb.steps[i].JumpStep)
if !ok {
loggermdl.LogError("Step Name spcify in GOTO not found: " + sb.steps[i].JumpStep)
return nil, errormdl.Wrap("Step Name spcify in GOTO not found: " + sb.steps[i].JumpStep)
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}
i = index - 1
continue
}
return sb.executeErrorFunction(sb.steps[i].ErrorFunc)
}
}
return sb.finalOutput(fn)
}
// executeValidationFunction exceute when validation failed for any step
func (sb *ServiceBuilder) executeValidationFunction(dataKey string, fn func(interface{}) error) error {
validationData, ok := sb.businessLogicHolder.localServiceData[dataKey]
if !ok {
loggermdl.LogError("Data Not Found For Validation: " + dataKey)
return errormdl.Wrap("Data Not Found For Validation: " + dataKey)
}
if fn == nil {
return validationmdl.ValidateStruct(validationData)
}
return fn(validationData)
}
// executeErrorFunction exceute when validation failed for any step
func (sb *ServiceBuilder) executeErrorFunction(fn func() (map[string]interface{}, error)) (*interface{}, error) {
if fn == nil {
loggermdl.LogError("Data Validation failed and No recovery function found")
return nil, errormdl.Wrap("Data Validation failed and No recovery function found")
}
_, err := fn()
if errormdl.CheckErr(err) != nil {
loggermdl.LogError(err)
return nil, errormdl.CheckErr(err)
}
return sb.businessLogicHolder.GetFinalData(), nil
}
// finalOutput return Final output
func (sb *ServiceBuilder) finalOutput(fn FinalStepProcessOutput) (*interface{}, error) {
if fn == nil {
return sb.businessLogicHolder.GetFinalData(), nil
}
return fn(sb.businessLogicHolder)
}
// Principal - Object inside JWT token
type Principal struct {
UserID string `json:"userId"`
Groups []string `json:"groups"`
SessionExpiration time.Time `json:"sessionExpiration"`
HitsCount int `json:"hitsCount"`
}
// // SetPrincipalObject - Set Principal object to BLHolder
// func (ab *AbstractBusinessLogicHolder) SetPrincipalObject(object *Principal) {
// ab.pricipalObject = *object
// }
// GetPrincipalObject - return Principal object from BLHolder
func (ab *AbstractBusinessLogicHolder) GetPrincipalObject() *Principal {
return &ab.pricipalObject
}