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package splunk // import "github.com/docker/docker/daemon/logger/splunk"
import (
"compress/gzip"
"context"
"encoding/json"
"fmt"
"io"
"net"
"net/http"
"sync"
"testing"
)
func (message *splunkMessage) EventAsString() (string, error) {
if val, ok := message.Event.(string); ok {
return val, nil
}
return "", fmt.Errorf("Cannot cast Event %v to string", message.Event)
}
func (message *splunkMessage) EventAsMap() (map[string]interface{}, error) {
if val, ok := message.Event.(map[string]interface{}); ok {
return val, nil
}
return nil, fmt.Errorf("Cannot cast Event %v to map", message.Event)
}
type HTTPEventCollectorMock struct {
tcpAddr *net.TCPAddr
tcpListener *net.TCPListener
mu sync.Mutex
token string
simulateServerError bool
blockingCtx context.Context
test *testing.T
connectionVerified bool
gzipEnabled *bool
messages []*splunkMessage
numOfRequests int
}
func NewHTTPEventCollectorMock(t *testing.T) *HTTPEventCollectorMock {
tcpAddr := &net.TCPAddr{IP: []byte{127, 0, 0, 1}, Port: 0, Zone: ""}
tcpListener, err := net.ListenTCP("tcp", tcpAddr)
if err != nil {
t.Fatal(err)
}
return &HTTPEventCollectorMock{
tcpAddr: tcpAddr,
tcpListener: tcpListener,
token: "4642492F-D8BD-47F1-A005-0C08AE4657DF",
simulateServerError: false,
test: t,
connectionVerified: false}
}
func (hec *HTTPEventCollectorMock) simulateErr(b bool) {
hec.mu.Lock()
hec.simulateServerError = b
hec.mu.Unlock()
}
func (hec *HTTPEventCollectorMock) withBlock(ctx context.Context) {
hec.mu.Lock()
hec.blockingCtx = ctx
hec.mu.Unlock()
}
func (hec *HTTPEventCollectorMock) URL() string {
return "http://" + hec.tcpListener.Addr().String()
}
func (hec *HTTPEventCollectorMock) Serve() error {
return http.Serve(hec.tcpListener, hec)
}
func (hec *HTTPEventCollectorMock) Close() error {
return hec.tcpListener.Close()
}
func (hec *HTTPEventCollectorMock) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
var err error
hec.numOfRequests++
hec.mu.Lock()
simErr := hec.simulateServerError
ctx := hec.blockingCtx
hec.mu.Unlock()
if ctx != nil {
<-hec.blockingCtx.Done()
}
if simErr {
if request.Body != nil {
defer request.Body.Close()
}
writer.WriteHeader(http.StatusInternalServerError)
return
}
switch request.Method {
case http.MethodOptions:
// Verify that options method is getting called only once
if hec.connectionVerified {
hec.test.Errorf("Connection should not be verified more than once. Got second request with %s method.", request.Method)
}
hec.connectionVerified = true
writer.WriteHeader(http.StatusOK)
case http.MethodPost:
// Always verify that Driver is using correct path to HEC
if request.URL.String() != "/services/collector/event/1.0" {
hec.test.Errorf("Unexpected path %v", request.URL)
}
defer request.Body.Close()
if authorization, ok := request.Header["Authorization"]; !ok || authorization[0] != ("Splunk "+hec.token) {
hec.test.Error("Authorization header is invalid.")
}
gzipEnabled := false
if contentEncoding, ok := request.Header["Content-Encoding"]; ok && contentEncoding[0] == "gzip" {
gzipEnabled = true
}
if hec.gzipEnabled == nil {
hec.gzipEnabled = &gzipEnabled
} else if gzipEnabled != *hec.gzipEnabled {
// Nothing wrong with that, but we just know that Splunk Logging Driver does not do that
hec.test.Error("Driver should not change Content Encoding.")
}
var gzipReader *gzip.Reader
var reader io.Reader
if gzipEnabled {
gzipReader, err = gzip.NewReader(request.Body)
if err != nil {
hec.test.Fatal(err)
}
reader = gzipReader
} else {
reader = request.Body
}
// Read body
var body []byte
body, err = io.ReadAll(reader)
if err != nil {
hec.test.Fatal(err)
}
// Parse message
messageStart := 0
for i := 0; i < len(body); i++ {
if i == len(body)-1 || (body[i] == '}' && body[i+1] == '{') {
var message splunkMessage
err = json.Unmarshal(body[messageStart:i+1], &message)
if err != nil {
hec.test.Log(string(body[messageStart : i+1]))
hec.test.Fatal(err)
}
hec.messages = append(hec.messages, &message)
messageStart = i + 1
}
}
if gzipEnabled {
gzipReader.Close()
}
writer.WriteHeader(http.StatusOK)
default:
hec.test.Errorf("Unexpected HTTP method %s", http.MethodOptions)
writer.WriteHeader(http.StatusBadRequest)
}
}
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