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rule.go
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rule.go
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// Copyright 2015 Eleme Inc. All rights reserved.
package webapp
import (
"net/http"
"strconv"
"github.com/eleme/banshee/models"
"github.com/jinzhu/gorm"
"github.com/julienschmidt/httprouter"
"github.com/mattn/go-sqlite3"
)
// createRule request
type createRuleRequest struct {
Pattern string `json:"pattern"`
TrendUp bool `json:"trendUp"`
TrendDown bool `json:"trendDown"`
ThresholdMax float64 `json:"thresholdMax"`
ThresholdMin float64 `json:"thresholdMin"`
Comment string `json:"comment"`
Level int `json:"level"`
Disabled bool `json:"disabled"`
}
// createRule creates a rule.
func createRule(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
// Params
projectID, err := strconv.Atoi(ps.ByName("id"))
if err != nil {
ResponseError(w, ErrProjectID)
return
}
// Request
req := &createRuleRequest{
Level: models.RuleLevelLow,
Disabled: false,
}
if err := RequestBind(r, req); err != nil {
ResponseError(w, ErrBadRequest)
return
}
// Validate
if err := models.ValidateRulePattern(req.Pattern); err != nil {
ResponseError(w, NewValidationWebError(err))
return
}
if projectID <= 0 {
// ProjectID is invalid.
ResponseError(w, ErrProjectID)
return
}
if !req.TrendUp && !req.TrendDown && req.ThresholdMax == 0 && req.ThresholdMin == 0 {
ResponseError(w, ErrRuleNoCondition)
return
}
if err := models.ValidateRuleLevel(req.Level); err != nil {
ResponseError(w, NewValidationWebError(err))
return
}
// Find project.
proj := &models.Project{}
if err := db.Admin.DB().First(proj, projectID).Error; err != nil {
switch err {
case gorm.RecordNotFound:
ResponseError(w, ErrProjectNotFound)
return
default:
ResponseError(w, NewUnexceptedWebError(err))
return
}
}
// Create rule.
rule := &models.Rule{
ProjectID: projectID,
Pattern: req.Pattern,
TrendUp: req.TrendUp,
TrendDown: req.TrendDown,
ThresholdMax: req.ThresholdMax,
ThresholdMin: req.ThresholdMin,
Comment: req.Comment,
Level: req.Level,
Disabled: req.Disabled,
}
if err := db.Admin.DB().Create(rule).Error; err != nil {
// Write errors.
sqliteErr, ok := err.(sqlite3.Error)
if ok {
switch sqliteErr.ExtendedCode {
case sqlite3.ErrConstraintNotNull:
ResponseError(w, ErrNotNull)
return
case sqlite3.ErrConstraintPrimaryKey:
ResponseError(w, ErrPrimaryKey)
return
case sqlite3.ErrConstraintUnique:
ResponseError(w, ErrDuplicateRulePattern)
return
}
}
// Unexcepted error.
ResponseError(w, NewUnexceptedWebError(err))
return
}
// Cache
db.Admin.RulesCache.Put(rule)
// Response
rule.SetNumMetrics(len(db.Index.Filter(rule.Pattern)))
ResponseJSONOK(w, rule)
}
// deleteRule deletes a rule from a project.
func deleteRule(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
// Params
id, err := strconv.Atoi(ps.ByName("id"))
if err != nil {
ResponseError(w, ErrProjectID)
return
}
// Delete
if err := db.Admin.DB().Delete(&models.Rule{ID: id}).Error; err != nil {
switch err {
case gorm.RecordNotFound:
ResponseError(w, ErrRuleNotFound)
return
default:
ResponseError(w, NewUnexceptedWebError(err))
return
}
}
// Cache
db.Admin.RulesCache.Delete(id)
}
// editRule edits a rule
func editRule(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
// id
id, err := strconv.Atoi(ps.ByName("id"))
if err != nil {
ResponseError(w, ErrProjectID)
return
}
// Request
req := &createRuleRequest{}
if err := RequestBind(r, req); err != nil {
ResponseError(w, ErrBadRequest)
return
}
// Validate
if err := models.ValidateRulePattern(req.Pattern); err != nil {
ResponseError(w, NewValidationWebError(err))
return
}
if err := models.ValidateRuleLevel(req.Level); err != nil {
ResponseError(w, NewValidationWebError(err))
return
}
if !req.TrendUp && !req.TrendDown && req.ThresholdMax == 0 && req.ThresholdMin == 0 {
ResponseError(w, ErrRuleNoCondition)
return
}
rule := &models.Rule{}
if db.Admin.DB().Where("id = ?", id).First(&rule).Error != nil {
ResponseError(w, ErrRuleNotFound)
return
}
rule.Comment = req.Comment
rule.Level = req.Level
rule.Pattern = req.Pattern
rule.TrendUp = req.TrendUp
rule.TrendDown = req.TrendDown
rule.ThresholdMax = req.ThresholdMax
rule.ThresholdMin = req.ThresholdMin
rule.Disabled = req.Disabled
if db.Admin.DB().Save(rule).Error != nil {
ResponseError(w, ErrRuleUpdateFailed)
return
}
// Cache
db.Admin.RulesCache.Delete(id)
db.Admin.RulesCache.Put(rule)
rule.SetNumMetrics(len(db.Index.Filter(rule.Pattern)))
ResponseJSONOK(w, rule)
}