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Serving SRV targets and getting all nodes in single request (#835)
* overall handler + label wrapper * srv seed list + splitCluster option * added request opts to overall handler * added splitcluster+srv tests * added overall handler test * readme update * fixed most linters * liners * added licence header * updated sync package * formatted * Update v1_compatibility_test.go * fixes due to idoqo review * overall handler + label wrapper * srv seed list + splitCluster option * added request opts to overall handler * added splitcluster+srv tests * added overall handler test * readme update * fixed most linters * liners * added licence header * fixes due to idoqo review * fix redeclaration * missing collector.pbm * fix prev merge * fix enable fcv Signed-off-by: ad <[email protected]> --------- Signed-off-by: ad <[email protected]> Co-authored-by: Jiří Čtvrtka <[email protected]> Co-authored-by: Nurlan Moldomurov <[email protected]> Co-authored-by: Nurlan Moldomurov <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| // mongodb_exporter | ||
| // Copyright (C) 2017 Percona LLC | ||
| // | ||
| // 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 exporter | ||
|
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||
| import ( | ||
| "github.com/pkg/errors" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| io_prometheus_client "github.com/prometheus/client_model/go" | ||
| ) | ||
|
|
||
| // GathererWrapped is a wrapper for prometheus.Gatherer that adds labels to all metrics. | ||
| type GathererWrapped struct { | ||
| originalGatherer prometheus.Gatherer | ||
| labels prometheus.Labels | ||
| } | ||
|
|
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| // NewGathererWrapper creates a new GathererWrapped with the given Gatherer and additional labels. | ||
| func NewGathererWrapper(gs prometheus.Gatherer, labels prometheus.Labels) *GathererWrapped { | ||
| return &GathererWrapped{ | ||
| originalGatherer: gs, | ||
| labels: labels, | ||
| } | ||
| } | ||
|
|
||
| // Gather implements prometheus.Gatherer interface. | ||
| func (g *GathererWrapped) Gather() ([]*io_prometheus_client.MetricFamily, error) { | ||
| metrics, err := g.originalGatherer.Gather() | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "failed to gather metrics") | ||
| } | ||
|
|
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| for _, metric := range metrics { | ||
| for _, m := range metric.GetMetric() { | ||
| for k, v := range g.labels { | ||
| v := v | ||
| k := k | ||
| m.Label = append(m.Label, &io_prometheus_client.LabelPair{ | ||
| Name: &k, | ||
| Value: &v, | ||
| }) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return metrics, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| // mongodb_exporter | ||
| // Copyright (C) 2017 Percona LLC | ||
| // | ||
| // 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. | ||
|
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| package exporter | ||
|
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| import ( | ||
| "net" | ||
| "net/url" | ||
| "strconv" | ||
| "strings" | ||
|
|
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| "github.com/sirupsen/logrus" | ||
| ) | ||
|
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| // GetSeedListFromSRV converts mongodb+srv URI to flat connection string. | ||
| func GetSeedListFromSRV(uri string, log *logrus.Logger) string { | ||
| uriParsed, err := url.Parse(uri) | ||
| if err != nil { | ||
| log.Fatalf("Failed to parse URI %s: %v", uri, err) | ||
| } | ||
|
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| cname, srvRecords, err := net.LookupSRV("mongodb", "tcp", uriParsed.Hostname()) | ||
| if err != nil { | ||
| log.Errorf("Failed to lookup SRV records for %s: %v", uri, err) | ||
| return uri | ||
| } | ||
|
|
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| if len(srvRecords) == 0 { | ||
| log.Errorf("No SRV records found for %s", uri) | ||
| return uri | ||
| } | ||
|
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| queryString := uriParsed.RawQuery | ||
|
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| txtRecords, err := net.LookupTXT(uriParsed.Hostname()) | ||
| if err != nil { | ||
| log.Errorf("Failed to lookup TXT records for %s: %v", cname, err) | ||
| } | ||
| if len(txtRecords) > 1 { | ||
| log.Errorf("Multiple TXT records found for %s, thus were not applied", cname) | ||
| } | ||
| if len(txtRecords) == 1 { | ||
| // We take connection parameters from the TXT record | ||
| uriParams, err := url.ParseQuery(txtRecords[0]) | ||
| if err != nil { | ||
| log.Errorf("Failed to parse TXT record %s: %v", txtRecords[0], err) | ||
| } else { | ||
| // Override connection parameters with ones from URI query string | ||
| for p, v := range uriParsed.Query() { | ||
| uriParams[p] = v | ||
| } | ||
| queryString = uriParams.Encode() | ||
| } | ||
| } | ||
|
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| // Build final connection URI | ||
| servers := make([]string, len(srvRecords)) | ||
| for i, srv := range srvRecords { | ||
| servers[i] = net.JoinHostPort(strings.TrimSuffix(srv.Target, "."), strconv.FormatUint(uint64(srv.Port), 10)) | ||
| } | ||
| uri = "mongodb://" | ||
| if uriParsed.User != nil { | ||
| uri += uriParsed.User.String() + "@" | ||
| } | ||
| uri += strings.Join(servers, ",") | ||
| if uriParsed.Path != "" { | ||
| uri += uriParsed.Path | ||
| } else { | ||
| uri += "/" | ||
| } | ||
| if queryString != "" { | ||
| uri += "?" + queryString | ||
| } | ||
|
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| return uri | ||
| } |
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