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moesifmiddleware.go
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moesifmiddleware.go
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/*
* moesifmiddleware-go
*/
package moesifmiddleware
import (
"bytes"
"crypto/rand"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"time"
moesifapi "github.com/moesif/moesifapi-go"
"github.com/moesif/moesifapi-go/models"
)
// Global variable
var (
apiClient moesifapi.API
debug bool
moesifOption map[string]interface{}
disableTransactionId bool
logBody bool
logBodyOutgoing bool
appConfig = NewAppConfig()
governanceRules = NewGovernanceRules()
)
// Initialize the client
func moesifClient(moesifOption map[string]interface{}) {
var apiEndpoint string
var batchSize int
var eventQueueSize int
var timerWakeupSeconds int
// Try to fetch the api endpoint
if endpoint, found := moesifOption["Api_Endpoint"].(string); found {
apiEndpoint = endpoint
}
// Try to fetch the event queue size
if queueSize, found := moesifOption["Event_Queue_Size"].(int); found {
eventQueueSize = queueSize
}
// Try to fetch the batch size
if batch, found := moesifOption["Batch_Size"].(int); found {
batchSize = batch
}
// Try to fetch the timer wake up seconds
if timer, found := moesifOption["Timer_Wake_Up_Seconds"].(int); found {
timerWakeupSeconds = timer
}
api := moesifapi.NewAPI(moesifOption["Application_Id"].(string), &apiEndpoint, eventQueueSize, batchSize, timerWakeupSeconds)
api.SetEventsHeaderCallback("X-Moesif-Config-ETag", appConfig.Notify)
api.SetEventsHeaderCallback("X-Moesif-Rules-Tag", governanceRules.Notify)
apiClient = api
// Disable debug by default
debug = false
// Try to fetch the debug from the option
if isDebug, found := moesifOption["Debug"].(bool); found {
debug = isDebug
}
// Disable TransactionId by default
disableTransactionId = false
// Try to fetch the disableTransactionId from the option
if isEnabled, found := moesifOption["disableTransactionId"].(bool); found {
disableTransactionId = isEnabled
}
// Enable logBody by default
logBody = true
// Try to fetch the disableTransactionId from the option
if isEnabled, found := moesifOption["Log_Body"].(bool); found {
logBody = isEnabled
}
// run goroutine to check end point for updates
appConfig.Go()
// run goroutine to check end point for updates
governanceRules.Go()
}
// Moesif Response Recorder
type MoesifResponseRecorder struct {
rw http.ResponseWriter
status int
writer io.Writer
header map[string][]string
}
// Function to generate UUID
func uuid() (string, error) {
b := make([]byte, 16)
_, err := rand.Read(b)
if err != nil {
return "", err
}
return fmt.Sprintf("%X-%X-%X-%X-%X", b[0:4], b[4:6], b[6:8], b[8:10], b[10:]), nil
}
// Response Recorder
func responseRecorder(rw http.ResponseWriter, status int, writer io.Writer) MoesifResponseRecorder {
rr := MoesifResponseRecorder{
rw,
status,
writer,
make(map[string][]string, 5),
}
return rr
}
// Implementing the WriteHeader method of ResponseWriter Interface
func (rec *MoesifResponseRecorder) WriteHeader(code int) {
rec.status = code
rec.rw.WriteHeader(code)
}
// Implementing the Write method of ResponseWriter Interface
func (rec *MoesifResponseRecorder) Write(b []byte) (int, error) {
return rec.writer.Write(b)
}
// Implementing the Header method of ResponseWriter Interface
func (rec *MoesifResponseRecorder) Header() http.Header {
return rec.rw.Header()
}
// Start Capture Outgoing Request
func StartCaptureOutgoing(configurationOption map[string]interface{}) {
// Call the function to initialize the moesif client and moesif options
if apiClient == nil {
// Set the Capture_Outoing_Requests to true to capture outgoing request
configurationOption["Capture_Outoing_Requests"] = true
moesifOption = configurationOption
moesifClient(moesifOption)
}
if debug {
log.Println("Start Capturing outgoing requests")
}
// Enable logBody by default
logBodyOutgoing = true
// Try to fetch the disableTransactionId from the option
if isEnabled, found := moesifOption["Log_Body_Outgoing"].(bool); found {
logBodyOutgoing = isEnabled
}
http.DefaultTransport = DefaultTransport
}
// Update User
func UpdateUser(user *models.UserModel, configurationOption map[string]interface{}) {
// Call the function to initialize the moesif client and moesif options
if apiClient == nil {
moesifClient(configurationOption)
}
// Add event to the queue
errUpdateUser := apiClient.QueueUser(user)
// Log the message
if errUpdateUser != nil {
log.Fatalf("Error while updating user: %s.\n", errUpdateUser.Error())
} else {
log.Println("Update User successfully added to the queue")
}
}
// Update Users Batch
func UpdateUsersBatch(users []*models.UserModel, configurationOption map[string]interface{}) {
// Call the function to initialize the moesif client and moesif options
if apiClient == nil {
moesifClient(configurationOption)
}
// Add event to the queue
errUpdateUserBatch := apiClient.QueueUsers(users)
// Log the message
if errUpdateUserBatch != nil {
log.Fatalf("Error while updating users in batch: %s.\n", errUpdateUserBatch.Error())
} else {
log.Println("Updated Users successfully added to the queue")
}
}
// Update Company
func UpdateCompany(company *models.CompanyModel, configurationOption map[string]interface{}) {
// Call the function to initialize the moesif client and moesif options
if apiClient == nil {
moesifClient(configurationOption)
}
// Add event to the queue
errUpdateCompany := apiClient.QueueCompany(company)
// Log the message
if errUpdateCompany != nil {
log.Fatalf("Error while updating company: %s.\n", errUpdateCompany.Error())
} else {
log.Println("Update Company successfully added to the queue")
}
}
// Update Companies Batch
func UpdateCompaniesBatch(companies []*models.CompanyModel, configurationOption map[string]interface{}) {
// Call the function to initialize the moesif client and moesif options
if apiClient == nil {
moesifClient(configurationOption)
}
// Add event to the queue
errUpdateCompaniesBatch := apiClient.QueueCompanies(companies)
// Log the message
if errUpdateCompaniesBatch != nil {
log.Fatalf("Error while updating companies in batch: %s.\n", errUpdateCompaniesBatch.Error())
} else {
log.Println("Updated companies successfully added to the queue")
}
}
// Update Subscription
func UpdateSubscription(subscription *models.SubscriptionModel, configurationOption map[string]interface{}) {
// Call the function to initialize the moesif client and moesif options
if apiClient == nil {
moesifClient(configurationOption)
}
// Add event to the queue
errUpdateSubscription := apiClient.QueueSubscription(subscription)
// Log the message
if errUpdateSubscription != nil {
log.Fatalf("Error while updating subscription: %s.\n", errUpdateSubscription.Error())
} else {
log.Println("Update Subscription successfully added to the queue")
}
}
// Update Subscriptions Batch
func UpdateSubscriptionsBatch(subscriptions []*models.SubscriptionModel, configurationOption map[string]interface{}) {
// Call the function to initialize the moesif client and moesif options
if apiClient == nil {
moesifClient(configurationOption)
}
// Add event to the queue
errUpdateSubscriptionsBatch := apiClient.QueueSubscriptions(subscriptions)
// Log the message
if errUpdateSubscriptionsBatch != nil {
log.Fatalf("Error while updating subscriptions in batch: %s.\n", errUpdateSubscriptionsBatch.Error())
} else {
log.Println("Updated subscriptions successfully added to the queue")
}
}
// Moesif Middleware
func MoesifMiddleware(next http.Handler, configurationOption map[string]interface{}) http.Handler {
// Call the function to initialize the moesif client and moesif options
if apiClient == nil {
moesifOption = configurationOption
moesifClient(moesifOption)
}
return http.HandlerFunc(func(rw http.ResponseWriter, request *http.Request) {
// Buffer
var buf bytes.Buffer
// Create a writer to duplicates it's writes to all the provided writers
multiWriter := io.MultiWriter(rw, &buf)
// Initialize the status to 200 in case WriteHeader is not called
response := responseRecorder(
rw,
200,
multiWriter,
)
// Add transactionId to the headers
if !disableTransactionId {
// Try to fetch the transactionId from the header
transactionId := request.Header.Get("X-Moesif-Transaction-Id")
// Check if need to generate transactionId
if len(transactionId) == 0 {
transactionId, _ = uuid()
}
if len(transactionId) != 0 {
// Add transationId to the request header
request.Header.Set("X-Moesif-Transaction-Id", transactionId)
// Add transationId to the response header
rw.Header().Add("X-Moesif-Transaction-Id", transactionId)
}
}
// Request Time
requestTime := time.Now().UTC()
var body1, body2 io.ReadCloser
var err error
if logBody {
// buffer the entire request body into memory for logging
if body1, body2, err = teeBody(request.Body); err != nil {
log.Printf("Error while reading request body: %v.\n", err)
} else {
// Body is a ReadCloser meaning that it does not implement the Seek interface
// It must be buffered into memory to be read more than once
// This is a replacement reader reading the buffer for the original server handler
request.Body = body1
}
}
companyId := getConfigStringValuesForIncomingEvent("Identify_Company", request, response)
userId := getConfigStringValuesForIncomingEvent("Identify_User", request, response)
// get user / company cohort rules' individual user and company entities info
// this is used to associate these entities with a speicifc rule and provide individual
// entity fields for header and body templating in the rule
userValues, companyValues := appConfig.GetEntityValues(userId, companyId)
// get rule records for cohort members above as well as regexp rules and check all rule matches
rules := governanceRules.Get(request, userValues, companyValues, userId, companyId)
ro := NewResponseOverride(&response, rules)
if !ro.Override.Block {
// Serve the HTTP Request
next.ServeHTTP(&ro, request)
}
ro.finish()
// Response Time
responseTime := time.Now().UTC()
shouldSkip := false
if _, found := moesifOption["Should_Skip"]; found {
shouldSkip = moesifOption["Should_Skip"].(func(*http.Request, MoesifResponseRecorder) bool)(request, response)
}
if shouldSkip {
if debug {
log.Printf("Skip sending the event to Moesif")
}
} else {
if debug {
log.Printf("Sending the event to Moesif")
}
if logBody {
// this is a separate ReadCloser, reading the same buffer as above for logging
request.Body = body2
}
// Call the function to send event to Moesif
sendEvent(request, response, buf.String(), requestTime, responseTime)
}
})
}
// Sending event to Moesif
func sendEvent(request *http.Request, response MoesifResponseRecorder, rspBufferString string, reqTime time.Time, rspTime time.Time) {
// Get Api Version
var apiVersion *string = nil
if isApiVersion, found := moesifOption["Api_Version"].(string); found {
apiVersion = &isApiVersion
}
// Get Request Body
var reqBody interface{}
var reqEncoding string
readReqBody, reqBodyErr := ioutil.ReadAll(request.Body)
if reqBodyErr != nil {
if debug {
log.Printf("Error while reading request body: %s.\n", reqBodyErr.Error())
}
}
reqContentLength := getContentLength(request.Header, readReqBody)
// Check if the request body is empty
reqBody = nil
if logBody && (len(readReqBody)) > 0 {
reqBody, reqEncoding = parseBody(readReqBody, "Request_Body_Masks")
}
// Get the response body
var respBody interface{}
var respEncoding string
respContentLength := getContentLength(response.Header(), []byte(rspBufferString))
// Parse the response Body
respBody = nil
if logBody {
respBody, respEncoding = parseBody([]byte(rspBufferString), "Response_Body_Masks")
}
// Get URL Scheme
if request.URL.Scheme == "" {
request.URL.Scheme = "http"
}
// Get Metadata
var metadata map[string]interface{} = nil
if _, found := moesifOption["Get_Metadata"]; found {
metadata = moesifOption["Get_Metadata"].(func(*http.Request, MoesifResponseRecorder) map[string]interface{})(request, response)
}
// Get User
userId := getConfigStringValuesForIncomingEvent("Identify_User", request, response)
// Get Company
companyId := getConfigStringValuesForIncomingEvent("Identify_Company", request, response)
// Get Session Token
sessionToken := getConfigStringValuesForIncomingEvent("Get_Session_Token", request, response)
direction := "Incoming"
// Mask Request Header
var requestHeader map[string]interface{}
requestHeader = maskHeaders(HeaderToMap(request.Header), "Request_Header_Masks")
// Mask Response Header
var responseHeader map[string]interface{}
responseHeader = maskHeaders(HeaderToMap(response.Header()), "Response_Header_Masks")
// Send Event To Moesif
sendMoesifAsync(request, reqTime, requestHeader, apiVersion, reqBody, &reqEncoding, reqContentLength,
rspTime, response.status, responseHeader, respBody, &respEncoding, respContentLength,
userId, companyId, &sessionToken, metadata, &direction)
}
// teeBody reads all of b to memory and then returns two equivalent
// ReadClosers yielding the same bytes.
// It returns an error if the initial slurp of all bytes fails.
func teeBody(b io.ReadCloser) (r1, r2 io.ReadCloser, err error) {
if b == nil || b == http.NoBody {
// No copying needed
return http.NoBody, http.NoBody, nil
}
var buf bytes.Buffer
if _, err = buf.ReadFrom(b); err != nil {
return nil, b, err
}
if err = b.Close(); err != nil {
return nil, b, err
}
return ioutil.NopCloser(&buf), ioutil.NopCloser(bytes.NewReader(buf.Bytes())), nil
}