93 lines
2.6 KiB
Go
93 lines
2.6 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package fingerprint
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import (
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"fmt"
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"strconv"
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"strings"
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"time"
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log "github.com/hashicorp/go-hclog"
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"github.com/hashicorp/nomad/helper"
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"github.com/hashicorp/nomad/helper/useragent"
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vapi "github.com/hashicorp/vault/api"
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)
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const (
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vaultAvailable = "available"
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vaultUnavailable = "unavailable"
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)
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// VaultFingerprint is used to fingerprint for Vault
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type VaultFingerprint struct {
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logger log.Logger
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client *vapi.Client
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lastState string
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}
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// NewVaultFingerprint is used to create a Vault fingerprint
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func NewVaultFingerprint(logger log.Logger) Fingerprint {
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return &VaultFingerprint{logger: logger.Named("vault"), lastState: vaultUnavailable}
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}
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func (f *VaultFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error {
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config := req.Config
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if config.VaultConfig == nil || !config.VaultConfig.IsEnabled() {
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return nil
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}
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// Only create the client once to avoid creating too many connections to Vault
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if f.client == nil {
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vaultConfig, err := config.VaultConfig.ApiConfig()
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if err != nil {
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return fmt.Errorf("Failed to initialize the Vault client config: %v", err)
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}
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f.client, err = vapi.NewClient(vaultConfig)
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if err != nil {
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return fmt.Errorf("Failed to initialize Vault client: %s", err)
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}
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useragent.SetHeaders(f.client)
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}
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// Connect to vault and parse its information
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status, err := f.client.Sys().SealStatus()
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if err != nil {
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// Print a message indicating that Vault is not available anymore
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if f.lastState == vaultAvailable {
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f.logger.Info("Vault is unavailable")
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}
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f.lastState = vaultUnavailable
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return nil
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}
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resp.AddAttribute("vault.accessible", strconv.FormatBool(true))
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// We strip the Vault prefix because < 0.6.2 the version looks like:
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// status.Version = "Vault v0.6.1"
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resp.AddAttribute("vault.version", strings.TrimPrefix(status.Version, "Vault "))
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resp.AddAttribute("vault.cluster_id", status.ClusterID)
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resp.AddAttribute("vault.cluster_name", status.ClusterName)
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// If Vault was previously unavailable print a message to indicate the Agent
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// is available now
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if f.lastState == vaultUnavailable {
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f.logger.Info("Vault is available")
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}
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f.lastState = vaultAvailable
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resp.Detected = true
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return nil
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}
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func (f *VaultFingerprint) Periodic() (bool, time.Duration) {
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if f.lastState == vaultAvailable {
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// Fingerprint infrequently once Vault is initially discovered with wide
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// jitter to avoid thundering herds of fingerprints against central Vault
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// servers.
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return true, (30 * time.Second) + helper.RandomStagger(90*time.Second)
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}
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return true, 15 * time.Second
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}
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