From 58119480574f64be5b4748edfa0e80246c93fdd8 Mon Sep 17 00:00:00 2001 From: Antonin Bas Date: Fri, 31 May 2024 16:23:11 -0700 Subject: [PATCH] Add more features to test IPFIX collector web API When querying records, one can now specify the max number of flows that should be returned (starting with the most recent one), as well as the format of the response (json or text). We also add a size limit for the flowRecords slice, to avoid unbounded memory usage. Signed-off-by: Antonin Bas --- cmd/collector/collector.go | 68 +++++++++++--- cmd/collector/collector_test.go | 154 ++++++++++++++++++++++++++++++++ 2 files changed, 211 insertions(+), 11 deletions(-) create mode 100644 cmd/collector/collector_test.go diff --git a/cmd/collector/collector.go b/cmd/collector/collector.go index 4bd9fb93..e3bb3cc5 100644 --- a/cmd/collector/collector.go +++ b/cmd/collector/collector.go @@ -40,6 +40,8 @@ import ( const ( logToStdErrFlag = "logtostderr" + // An arbitrary limit, to prevent unbounded memory usage. + maxFlowRecords = 4096 ) var ( @@ -48,8 +50,14 @@ var ( IPFIXTransport string flowRecords []string mutex sync.Mutex + + flowTextSeparator = bytes.Repeat([]byte("="), 80) ) +type jsonResponse struct { + FlowRecords []string `json:"flowRecords"` +} + func initLoggingToFile(fs *pflag.FlagSet) { var err error @@ -134,6 +142,11 @@ func addIPFIXMessage(msg *entities.Message) { } mutex.Lock() defer mutex.Unlock() + if len(flowRecords) >= maxFlowRecords { + // Zero and remove first element. + flowRecords[0] = "" // Ensure first element can be garbage-collected. + flowRecords = flowRecords[1:] + } flowRecords = append(flowRecords, buf.String()) } @@ -240,21 +253,54 @@ func newCollectorCommand() *cobra.Command { func flowRecordHandler(w http.ResponseWriter, r *http.Request) { if r.Method == "GET" { + countP := r.URL.Query().Get("count") + var count int + if countP != "" { + var err error + if count, err = strconv.Atoi(countP); err != nil || count < 0 { + http.Error(w, "Invalid count query parameter", http.StatusBadRequest) + return + } + } else { + count = -1 + } + format := r.URL.Query().Get("format") + if format == "" { + format = "json" + } + if format != "text" && format != "json" { + http.Error(w, "Invalid format query parameter", http.StatusBadRequest) + return + } mutex.Lock() defer mutex.Unlock() + if count < 0 || count > len(flowRecords) { + count = len(flowRecords) + } // Retrieve data - klog.InfoS("Return flow records", "length", len(flowRecords)) - // Convert data to JSON - responseData := map[string]interface{}{"flowRecords": flowRecords} - jsonData, err := json.Marshal(responseData) - if err != nil { - http.Error(w, "Internal Server Error", http.StatusInternalServerError) - return + klog.InfoS("Return flow records", "length", count) + records := flowRecords[len(flowRecords)-count:] + if format == "json" { + // Convert data to JSON + responseData := &jsonResponse{ + FlowRecords: records, + } + jsonData, err := json.Marshal(responseData) + if err != nil { + http.Error(w, "Internal Server Error", http.StatusInternalServerError) + return + } + w.Header().Set("Content-Type", "application/json") + // Write JSON response + w.Write(jsonData) + } else { + w.Header().Set("Content-Type", "text/plain") + for idx := range records { + w.Write([]byte(records[idx])) + // Write a separator + w.Write(flowTextSeparator) + } } - // Set response headers - w.Header().Set("Content-Type", "application/json") - // Write JSON response - w.Write(jsonData) } else { http.Error(w, "Invalid request method", http.StatusMethodNotAllowed) } diff --git a/cmd/collector/collector_test.go b/cmd/collector/collector_test.go new file mode 100644 index 00000000..a64cb3a1 --- /dev/null +++ b/cmd/collector/collector_test.go @@ -0,0 +1,154 @@ +// Copyright 2024 VMware, Inc. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package main + +import ( + "encoding/json" + "io" + "net/http" + "net/http/httptest" + "net/url" + "strings" + "testing" + + "github.com/stretchr/testify/assert" + "github.com/stretchr/testify/require" + + "github.com/vmware/go-ipfix/pkg/entities" +) + +var testFlowRecords = []string{"flow1", "flow2", "flow3"} + +func TestFlowRecordHandler(t *testing.T) { + flowRecords = testFlowRecords + defer func() { + flowRecords = nil + }() + + testCases := []struct { + name string + countParam string + formatParam string + expectedStatus int + expectedFlows []string + }{ + { + name: "default", + expectedFlows: []string{"flow1", "flow2", "flow3"}, + }, + { + name: "last flow", + countParam: "1", + expectedFlows: []string{"flow3"}, + }, + { + name: "text format", + formatParam: "text", + expectedFlows: []string{"flow1", "flow2", "flow3"}, + }, + { + name: "json format", + formatParam: "json", + expectedFlows: []string{"flow1", "flow2", "flow3"}, + }, + { + name: "large count", + countParam: "100", + expectedFlows: []string{"flow1", "flow2", "flow3"}, + }, + { + name: "invalid count", + countParam: "-1", + expectedStatus: http.StatusBadRequest, + }, + { + name: "invalid format", + formatParam: "foobar", + expectedStatus: http.StatusBadRequest, + }, + { + name: "both params set", + countParam: "2", + formatParam: "text", + expectedFlows: []string{"flow1", "flow2"}, + }, + } + + for _, tc := range testCases { + expectedStatus := tc.expectedStatus + if expectedStatus == 0 { + expectedStatus = http.StatusOK + } + format := tc.formatParam + if format == "" { + format = "json" + } + rr := httptest.NewRecorder() + u := url.URL{ + Path: "/records", + } + q := u.Query() + if tc.countParam != "" { + q.Set("count", tc.countParam) + } + if tc.formatParam != "" { + q.Set("format", tc.formatParam) + } + u.RawQuery = q.Encode() + req, err := http.NewRequest("GET", u.String(), nil) + require.NoError(t, err) + flowRecordHandler(rr, req) + resp := rr.Result() + defer resp.Body.Close() + require.Equal(t, expectedStatus, resp.StatusCode) + body, err := io.ReadAll(resp.Body) + require.NoError(t, err) + + if expectedStatus != http.StatusOK { + return + } + + contentType := resp.Header.Get("Content-type") + if format == "json" { + require.Equal(t, "application/json", contentType) + var data jsonResponse + err := json.Unmarshal(body, &data) + require.NoError(t, err, "Invalid JSON response") + assert.Equal(t, tc.expectedFlows, data.FlowRecords) + } else if format == "text" { + require.Equal(t, "text/plain", contentType) + flows := strings.Split(string(body), string(flowTextSeparator)) + // Ignore the last empty fragment. + assert.Equal(t, tc.expectedFlows, flows[:len(flows)-1]) + } else { + require.FailNow(t, "Invalid format specified for test case") + } + } +} + +func TestAddIPFIXMessage(t *testing.T) { + defer func() { + flowRecords = nil + }() + set := entities.NewSet(false) + msg := entities.NewMessage(false) + msg.AddSet(set) + for i := 0; i < maxFlowRecords; i++ { + addIPFIXMessage(msg) + require.Len(t, flowRecords, i+1) + } + addIPFIXMessage(msg) + assert.Len(t, flowRecords, maxFlowRecords) +}