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Perform atomic writes for resulting service discovery YAML file #82

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Perform atomic writes for resulting service discovery YAML file #82

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8ff1dd4
Minor autoindents
Feb 8, 2022
15e4e98
Perform atomic writes for resulting service discovery YAML file
Feb 8, 2022
a5e9d72
Ensure outputted service discovery YAML file mode is 0644
Feb 9, 2022
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1 change: 1 addition & 0 deletions go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -11,4 +11,5 @@ require (
github.com/aws/smithy-go v1.3.0
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/go-yaml/yaml v2.1.0+incompatible
github.com/natefinch/atomic v1.0.1
)
2 changes: 2 additions & 0 deletions go.sum
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Expand Up @@ -29,6 +29,8 @@ github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9Y
github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo=
github.com/jmespath/go-jmespath/internal/testify v1.5.1 h1:shLQSRRSCCPj3f2gpwzGwWFoC7ycTf1rcQZHOlsJ6N8=
github.com/jmespath/go-jmespath/internal/testify v1.5.1/go.mod h1:L3OGu8Wl2/fWfCI6z80xFu9LTZmf1ZRjMHUOPmWr69U=
github.com/natefinch/atomic v1.0.1 h1:ZPYKxkqQOx3KZ+RsbnP/YsgvxWQPGxjC0oBt2AhwV0A=
github.com/natefinch/atomic v1.0.1/go.mod h1:N/D/ELrljoqDyT3rZrsUmtsuzvHkeB/wWjHV22AZRbM=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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12 changes: 8 additions & 4 deletions main.go
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Expand Up @@ -15,12 +15,13 @@
package main

import (
"bytes"
"context"
"errors"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"strconv"
"strings"
"time"
Expand All @@ -34,6 +35,7 @@ import (
"github.com/aws/aws-sdk-go-v2/service/sts"
"github.com/aws/smithy-go"
"github.com/go-yaml/yaml"
"github.com/natefinch/atomic"
)

type labels struct {
Expand All @@ -60,7 +62,7 @@ var times = flag.Int("config.scrape-times", 0, "how many times to scrape before
var roleArn = flag.String("config.role-arn", "", "ARN of the role to assume when scraping the AWS API (optional)")
var prometheusPortLabel = flag.String("config.port-label", "PROMETHEUS_EXPORTER_PORT", "Docker label to define the scrape port of the application (if missing an application won't be scraped)")
var prometheusPathLabel = flag.String("config.path-label", "PROMETHEUS_EXPORTER_PATH", "Docker label to define the scrape path of the application")
var prometheusSchemeLabel= flag.String("config.scheme-label", "PROMETHEUS_EXPORTER_SCHEME", "Docker label to define the scheme of the target application")
var prometheusSchemeLabel = flag.String("config.scheme-label", "PROMETHEUS_EXPORTER_SCHEME", "Docker label to define the scheme of the target application")
var prometheusFilterLabel = flag.String("config.filter-label", "", "Docker label (and optionally value) to require to scrape the application")
var prometheusServerNameLabel = flag.String("config.server-name-label", "PROMETHEUS_EXPORTER_SERVER_NAME", "Docker label to define the server name")
var prometheusJobNameLabel = flag.String("config.job-name-label", "PROMETHEUS_EXPORTER_JOB_NAME", "Docker label to define the job name")
Expand Down Expand Up @@ -297,7 +299,7 @@ func (t *AugmentedTask) ExporterInformation() []*PrometheusTaskInfo {

scheme, ok = d.DockerLabels[*prometheusSchemeLabel]
if ok {
labels.Scheme = scheme
labels.Scheme = scheme
}

ret = append(ret, &PrometheusTaskInfo{
Expand Down Expand Up @@ -661,16 +663,18 @@ func main() {
infos = append(infos, info...)
}
m, err := yaml.Marshal(infos)
b := bytes.NewBuffer(m)
if err != nil {
logError(err)
return
}
log.Printf("Writing %d discovered exporters to %s", len(infos), *outFile)
err = ioutil.WriteFile(*outFile, m, 0644)
err = atomic.WriteFile(*outFile, b)
if err != nil {
logError(err)
return
}
os.Chmod(*outFile, 0644)
}
s := time.NewTimer(1 * time.Millisecond)
t := time.NewTicker(*interval)
Expand Down