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357 lines
14 KiB
Go
357 lines
14 KiB
Go
package loki
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import (
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"io/ioutil"
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"math"
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"net/http"
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"net/http/httptest"
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"strings"
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"testing"
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"time"
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"github.com/go-kit/kit/log"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"github.com/lixh00/loki-client-go/pkg/backoff"
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"github.com/lixh00/loki-client-go/pkg/httputil"
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"github.com/lixh00/loki-client-go/pkg/labelutil"
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"github.com/lixh00/loki-client-go/pkg/urlutil"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/testutil"
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"github.com/prometheus/common/config"
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"github.com/prometheus/common/model"
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"github.com/lixh00/loki-client-go/pkg/logproto"
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)
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var logEntries = []entry{
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{labels: model.LabelSet{}, Entry: logproto.Entry{Timestamp: time.Unix(1, 0).UTC(), Line: "line1"}},
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{labels: model.LabelSet{}, Entry: logproto.Entry{Timestamp: time.Unix(2, 0).UTC(), Line: "line2"}},
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{labels: model.LabelSet{}, Entry: logproto.Entry{Timestamp: time.Unix(3, 0).UTC(), Line: "line3"}},
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{labels: model.LabelSet{"__tenant_id__": "tenant-1"}, Entry: logproto.Entry{Timestamp: time.Unix(4, 0).UTC(), Line: "line4"}},
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{labels: model.LabelSet{"__tenant_id__": "tenant-1"}, Entry: logproto.Entry{Timestamp: time.Unix(5, 0).UTC(), Line: "line5"}},
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{labels: model.LabelSet{"__tenant_id__": "tenant-2"}, Entry: logproto.Entry{Timestamp: time.Unix(6, 0).UTC(), Line: "line6"}},
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}
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type receivedReq struct {
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tenantID string
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pushReq logproto.PushRequest
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}
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func TestClient_Handle(t *testing.T) {
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tests := map[string]struct {
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clientBatchSize int
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clientBatchWait time.Duration
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clientMaxRetries int
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clientTenantID string
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serverResponseStatus int
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inputEntries []entry
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inputDelay time.Duration
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expectedReqs []receivedReq
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expectedMetrics string
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}{
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"batch log entries together until the batch size is reached": {
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clientBatchSize: 10,
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clientBatchWait: 100 * time.Millisecond,
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clientMaxRetries: 3,
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serverResponseStatus: 200,
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inputEntries: []entry{logEntries[0], logEntries[1], logEntries[2]},
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expectedReqs: []receivedReq{
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{
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tenantID: "",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[0].Entry, logEntries[1].Entry}}}},
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},
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{
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tenantID: "",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[2].Entry}}}},
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},
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},
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expectedMetrics: `
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# HELP promtail_sent_entries_total Number of log entries sent to the ingester.
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# TYPE promtail_sent_entries_total counter
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promtail_sent_entries_total{host="__HOST__"} 3.0
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# HELP promtail_dropped_entries_total Number of log entries dropped because failed to be sent to the ingester after all retries.
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# TYPE promtail_dropped_entries_total counter
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promtail_dropped_entries_total{host="__HOST__"} 0
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`,
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},
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"batch log entries together until the batch wait time is reached": {
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clientBatchSize: 10,
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clientBatchWait: 100 * time.Millisecond,
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clientMaxRetries: 3,
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serverResponseStatus: 200,
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inputEntries: []entry{logEntries[0], logEntries[1]},
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inputDelay: 110 * time.Millisecond,
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expectedReqs: []receivedReq{
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{
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tenantID: "",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[0].Entry}}}},
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},
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{
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tenantID: "",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[1].Entry}}}},
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},
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},
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expectedMetrics: `
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# HELP promtail_sent_entries_total Number of log entries sent to the ingester.
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# TYPE promtail_sent_entries_total counter
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promtail_sent_entries_total{host="__HOST__"} 2.0
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# HELP promtail_dropped_entries_total Number of log entries dropped because failed to be sent to the ingester after all retries.
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# TYPE promtail_dropped_entries_total counter
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promtail_dropped_entries_total{host="__HOST__"} 0
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`,
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},
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"retry send a batch up to backoff's max retries in case the server responds with a 5xx": {
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clientBatchSize: 10,
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clientBatchWait: 10 * time.Millisecond,
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clientMaxRetries: 3,
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serverResponseStatus: 500,
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inputEntries: []entry{logEntries[0]},
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expectedReqs: []receivedReq{
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{
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tenantID: "",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[0].Entry}}}},
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},
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{
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tenantID: "",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[0].Entry}}}},
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},
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{
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tenantID: "",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[0].Entry}}}},
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},
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},
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expectedMetrics: `
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# HELP promtail_dropped_entries_total Number of log entries dropped because failed to be sent to the ingester after all retries.
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# TYPE promtail_dropped_entries_total counter
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promtail_dropped_entries_total{host="__HOST__"} 1.0
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# HELP promtail_sent_entries_total Number of log entries sent to the ingester.
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# TYPE promtail_sent_entries_total counter
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promtail_sent_entries_total{host="__HOST__"} 0
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`,
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},
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"do not retry send a batch in case the server responds with a 4xx": {
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clientBatchSize: 10,
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clientBatchWait: 10 * time.Millisecond,
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clientMaxRetries: 3,
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serverResponseStatus: 400,
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inputEntries: []entry{logEntries[0]},
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expectedReqs: []receivedReq{
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{
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tenantID: "",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[0].Entry}}}},
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},
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},
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expectedMetrics: `
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# HELP promtail_dropped_entries_total Number of log entries dropped because failed to be sent to the ingester after all retries.
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# TYPE promtail_dropped_entries_total counter
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promtail_dropped_entries_total{host="__HOST__"} 1.0
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# HELP promtail_sent_entries_total Number of log entries sent to the ingester.
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# TYPE promtail_sent_entries_total counter
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promtail_sent_entries_total{host="__HOST__"} 0
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`,
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},
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"do retry sending a batch in case the server responds with a 429": {
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clientBatchSize: 10,
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clientBatchWait: 10 * time.Millisecond,
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clientMaxRetries: 3,
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serverResponseStatus: 429,
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inputEntries: []entry{logEntries[0]},
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expectedReqs: []receivedReq{
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{
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tenantID: "",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[0].Entry}}}},
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},
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{
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tenantID: "",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[0].Entry}}}},
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},
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{
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tenantID: "",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[0].Entry}}}},
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},
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},
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expectedMetrics: `
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# HELP promtail_dropped_entries_total Number of log entries dropped because failed to be sent to the ingester after all retries.
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# TYPE promtail_dropped_entries_total counter
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promtail_dropped_entries_total{host="__HOST__"} 1.0
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# HELP promtail_sent_entries_total Number of log entries sent to the ingester.
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# TYPE promtail_sent_entries_total counter
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promtail_sent_entries_total{host="__HOST__"} 0
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`,
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},
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"batch log entries together honoring the client tenant ID": {
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clientBatchSize: 100,
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clientBatchWait: 100 * time.Millisecond,
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clientMaxRetries: 3,
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clientTenantID: "tenant-default",
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serverResponseStatus: 200,
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inputEntries: []entry{logEntries[0], logEntries[1]},
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expectedReqs: []receivedReq{
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{
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tenantID: "tenant-default",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[0].Entry, logEntries[1].Entry}}}},
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},
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},
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expectedMetrics: `
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# HELP promtail_sent_entries_total Number of log entries sent to the ingester.
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# TYPE promtail_sent_entries_total counter
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promtail_sent_entries_total{host="__HOST__"} 2.0
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# HELP promtail_dropped_entries_total Number of log entries dropped because failed to be sent to the ingester after all retries.
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# TYPE promtail_dropped_entries_total counter
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promtail_dropped_entries_total{host="__HOST__"} 0
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`,
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},
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"batch log entries together honoring the tenant ID overridden while processing the pipeline stages": {
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clientBatchSize: 100,
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clientBatchWait: 100 * time.Millisecond,
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clientMaxRetries: 3,
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clientTenantID: "tenant-default",
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serverResponseStatus: 200,
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inputEntries: []entry{logEntries[0], logEntries[3], logEntries[4], logEntries[5]},
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expectedReqs: []receivedReq{
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{
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tenantID: "tenant-default",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[0].Entry}}}},
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},
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{
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tenantID: "tenant-1",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[3].Entry, logEntries[4].Entry}}}},
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},
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{
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tenantID: "tenant-2",
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pushReq: logproto.PushRequest{Streams: []logproto.Stream{{Labels: "{}", Entries: []logproto.Entry{logEntries[5].Entry}}}},
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},
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},
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expectedMetrics: `
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# HELP promtail_sent_entries_total Number of log entries sent to the ingester.
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# TYPE promtail_sent_entries_total counter
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promtail_sent_entries_total{host="__HOST__"} 4.0
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# HELP promtail_dropped_entries_total Number of log entries dropped because failed to be sent to the ingester after all retries.
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# TYPE promtail_dropped_entries_total counter
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promtail_dropped_entries_total{host="__HOST__"} 0
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`,
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},
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}
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for testName, testData := range tests {
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t.Run(testName, func(t *testing.T) {
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// Reset metrics
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sentEntries.Reset()
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droppedEntries.Reset()
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// Create a buffer channel where we do enqueue received requests
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receivedReqsChan := make(chan receivedReq, 10)
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// Start a local HTTP server
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server := httptest.NewServer(createServerHandler(receivedReqsChan, testData.serverResponseStatus))
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require.NotNil(t, server)
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defer server.Close()
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// Get the URL at which the local test server is listening to
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serverURL := urlutil.URLValue{}
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err := serverURL.Set(server.URL)
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require.NoError(t, err)
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// Instance the client
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cfg := Config{
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URL: serverURL,
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BatchWait: testData.clientBatchWait,
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BatchSize: testData.clientBatchSize,
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Client: config.HTTPClientConfig{},
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BackoffConfig: backoff.BackoffConfig{MinBackoff: 1 * time.Millisecond, MaxBackoff: 2 * time.Millisecond, MaxRetries: testData.clientMaxRetries},
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ExternalLabels: labelutil.LabelSet{},
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Timeout: 1 * time.Second,
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TenantID: testData.clientTenantID,
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}
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c, err := NewWithLogger(cfg, log.NewNopLogger())
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require.NoError(t, err)
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// Send all the input log entries
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for i, logEntry := range testData.inputEntries {
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err = c.Handle(logEntry.labels, logEntry.Timestamp, logEntry.Line)
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require.NoError(t, err)
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if testData.inputDelay > 0 && i < len(testData.inputEntries)-1 {
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time.Sleep(testData.inputDelay)
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}
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}
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// Wait until the expected push requests are received (with a timeout)
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deadline := time.Now().Add(1 * time.Second)
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for len(receivedReqsChan) < len(testData.expectedReqs) && time.Now().Before(deadline) {
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time.Sleep(5 * time.Millisecond)
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}
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// Stop the client: it waits until the current batch is sent
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c.Stop()
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close(receivedReqsChan)
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// Get all push requests received on the server side
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receivedReqs := make([]receivedReq, 0)
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for req := range receivedReqsChan {
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receivedReqs = append(receivedReqs, req)
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}
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// Due to implementation details (maps iteration ordering is random) we just check
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// that the expected requests are equal to the received requests, without checking
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// the exact order which is not guaranteed in case of multi-tenant
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require.ElementsMatch(t, testData.expectedReqs, receivedReqs)
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expectedMetrics := strings.Replace(testData.expectedMetrics, "__HOST__", serverURL.Host, -1)
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err = testutil.GatherAndCompare(prometheus.DefaultGatherer, strings.NewReader(expectedMetrics), "promtail_sent_entries_total", "promtail_dropped_entries_total")
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assert.NoError(t, err)
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})
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}
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}
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func createServerHandler(receivedReqsChan chan receivedReq, status int) http.HandlerFunc {
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return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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// Parse the request
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var pushReq logproto.PushRequest
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if err := httputil.ParseProtoReader(req.Context(), req.Body, int(req.ContentLength), math.MaxInt32, &pushReq, httputil.RawSnappy); err != nil {
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rw.WriteHeader(500)
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return
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}
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receivedReqsChan <- receivedReq{
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tenantID: req.Header.Get("X-Scope-OrgID"),
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pushReq: pushReq,
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}
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rw.WriteHeader(status)
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})
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}
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type roundTripFunc func(r *http.Request) (*http.Response, error)
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func (s roundTripFunc) RoundTrip(r *http.Request) (*http.Response, error) {
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return s(r)
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}
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func TestClient_EncodeJSON(t *testing.T) {
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c, err := NewWithDefault("http://loki.com/loki/api/v1/push")
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require.NoError(t, err)
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c.cfg.EncodeJson = true
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c.client.Transport = roundTripFunc(func(r *http.Request) (*http.Response, error) {
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require.Equal(t, r.Header.Get("Content-Type"), JSONContentType)
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require.Equal(t, r.URL.Path, "/loki/api/v1/push")
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b, err := ioutil.ReadAll(r.Body)
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require.NoError(t, err)
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require.Equal(t, `{"streams":[{"stream":{"foo":"bar"},"values":[["1","11"],["2","22"]]},{"stream":{"foo":"buzz"},"values":[["3","33"],["4","44"]]}]}`, string(b))
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return &http.Response{StatusCode: 200, Body: http.NoBody}, nil
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})
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c.sendBatch("",
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newBatch(
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entry{labels: model.LabelSet{"foo": "bar"}, Entry: logproto.Entry{Timestamp: time.Unix(0, 1), Line: "11"}},
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entry{labels: model.LabelSet{"foo": "bar"}, Entry: logproto.Entry{Timestamp: time.Unix(0, 2), Line: "22"}},
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entry{labels: model.LabelSet{"foo": "buzz"}, Entry: logproto.Entry{Timestamp: time.Unix(0, 3), Line: "33"}},
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entry{labels: model.LabelSet{"foo": "buzz"}, Entry: logproto.Entry{Timestamp: time.Unix(0, 4), Line: "44"}},
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),
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)
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}
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