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Implement ApplyConfig for Loki (#416)
* Implement ApplyConfig for Loki * add integration test for ApplyConfig * fix lint, race errors, map deletion * make windows test happy
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Original file line number | Diff line number | Diff line change |
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//+build !race | ||
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package loki | ||
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import ( | ||
"fmt" | ||
"io/ioutil" | ||
"net" | ||
"net/http" | ||
"os" | ||
"strings" | ||
"testing" | ||
"time" | ||
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"github.com/go-kit/kit/log" | ||
"github.com/grafana/agent/pkg/util" | ||
"github.com/grafana/loki/pkg/distributor" | ||
"github.com/grafana/loki/pkg/logproto" | ||
"github.com/prometheus/client_golang/prometheus" | ||
"github.com/stretchr/testify/require" | ||
"gopkg.in/yaml.v2" | ||
) | ||
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func TestLoki(t *testing.T) { | ||
// | ||
// Create a temporary file to tail | ||
// | ||
positionsDir, err := ioutil.TempDir(os.TempDir(), "positions-*") | ||
require.NoError(t, err) | ||
t.Cleanup(func() { | ||
_ = os.RemoveAll(positionsDir) | ||
}) | ||
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tmpFile, err := ioutil.TempFile(os.TempDir(), "*.log") | ||
require.NoError(t, err) | ||
t.Cleanup(func() { | ||
_ = os.RemoveAll(tmpFile.Name()) | ||
}) | ||
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// | ||
// Listen for push requests and pass them through to a channel | ||
// | ||
pushes := make(chan *logproto.PushRequest) | ||
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lis, err := net.Listen("tcp", "127.0.0.1:0") | ||
require.NoError(t, err) | ||
t.Cleanup(func() { | ||
require.NoError(t, lis.Close()) | ||
}) | ||
go func() { | ||
_ = http.Serve(lis, http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) { | ||
req, err := distributor.ParseRequest(r) | ||
require.NoError(t, err) | ||
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pushes <- req | ||
_, _ = rw.Write(nil) | ||
})) | ||
}() | ||
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// | ||
// Launch Loki so it starts tailing the file and writes to our server. | ||
// | ||
cfgText := util.Untab(fmt.Sprintf(` | ||
positions_directory: %s | ||
configs: | ||
- name: default | ||
clients: | ||
- url: http://%s/loki/api/v1/push | ||
batchwait: 50ms | ||
batchsize: 1 | ||
scrape_configs: | ||
- job_name: system | ||
static_configs: | ||
- targets: [localhost] | ||
labels: | ||
job: test | ||
__path__: %s | ||
`, positionsDir, lis.Addr().String(), tmpFile.Name())) | ||
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var cfg Config | ||
dec := yaml.NewDecoder(strings.NewReader(cfgText)) | ||
dec.SetStrict(true) | ||
require.NoError(t, dec.Decode(&cfg)) | ||
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logger := log.NewSyncLogger(log.NewNopLogger()) | ||
l, err := New(prometheus.NewRegistry(), cfg, logger) | ||
require.NoError(t, err) | ||
defer l.Stop() | ||
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// | ||
// Write a log line and wait for it to come through. | ||
// | ||
fmt.Fprintf(tmpFile, "Hello, world!\n") | ||
select { | ||
case <-time.After(time.Second * 30): | ||
require.FailNow(t, "timed out waiting for data to be pushed") | ||
case req := <-pushes: | ||
require.Equal(t, "Hello, world!", req.Streams[0].Entries[0].Line) | ||
} | ||
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// | ||
// Apply a new config and write a new line. | ||
// | ||
cfgText = util.Untab(fmt.Sprintf(` | ||
positions_directory: %s | ||
configs: | ||
- name: default | ||
clients: | ||
- url: http://%s/loki/api/v1/push | ||
batchwait: 50ms | ||
batchsize: 5 | ||
scrape_configs: | ||
- job_name: system | ||
static_configs: | ||
- targets: [localhost] | ||
labels: | ||
job: test-2 | ||
__path__: %s | ||
`, positionsDir, lis.Addr().String(), tmpFile.Name())) | ||
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var newCfg Config | ||
dec = yaml.NewDecoder(strings.NewReader(cfgText)) | ||
dec.SetStrict(true) | ||
require.NoError(t, dec.Decode(&newCfg)) | ||
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require.NoError(t, l.ApplyConfig(newCfg)) | ||
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fmt.Fprintf(tmpFile, "Hello again!\n") | ||
select { | ||
case <-time.After(time.Second * 30): | ||
require.FailNow(t, "timed out waiting for data to be pushed") | ||
case req := <-pushes: | ||
require.Equal(t, "Hello again!", req.Streams[0].Entries[0].Line) | ||
} | ||
} |
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