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Adding multiple retries for agent metadata query #1

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merged 1 commit into from
Dec 11, 2023
Merged

Adding multiple retries for agent metadata query #1

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22 changes: 21 additions & 1 deletion nex-agent/metadata.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,9 +2,11 @@ package nexagent

import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"time"

agentapi "github.com/ConnectEverything/nex/agent-api"
)
Expand Down Expand Up @@ -34,12 +36,31 @@ func GetMachineMetadata() (*agentapi.MachineMetadata, error) {
req.Header.Set("Accept", "application/json")
req.Header.Set("X-metadata-token", token)

remainingAttempts := 3
client := &http.Client{}
for remainingAttempts > 0 {
metadata, err := performMatadataQuery(url, req, client)
if err != nil {
remainingAttempts -= 1
time.Sleep(1 * time.Second)
continue
} else {
return metadata, nil
}
}

return nil, errors.New("failed to obtain metadata after multiple attempts")
}

func performMatadataQuery(url string, req *http.Request, client *http.Client) (*agentapi.MachineMetadata, error) {
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, errors.New("metadata not found")
}
bodyBytes, err := io.ReadAll(resp.Body)

if err != nil {
Expand All @@ -51,7 +72,6 @@ func GetMachineMetadata() (*agentapi.MachineMetadata, error) {
if err != nil {
return nil, fmt.Errorf("deserialization failure: %s: body: '%s'", err, string(bodyBytes))
}

return &metadata, nil
}

Expand Down