Output: Azure Monitor: Cleanup and add README
This commit is contained in:
Gunnar Aasen
@@ -14,23 +14,25 @@ import (
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"github.com/Azure/go-autorest/autorest/adal"
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"github.com/Azure/go-autorest/autorest/azure"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/internal"
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"github.com/influxdata/telegraf/plugins/outputs"
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)
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// AzureMonitor allows publishing of metrics to the Azure Monitor custom metrics service
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type AzureMonitor struct {
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ResourceID string `toml:"resourceId"`
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Region string `toml:"region"`
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HTTPPostTimeout int `toml:"httpPostTimeout"`
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AzureSubscriptionID string `toml:"azureSubscription"`
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AzureTenantID string `toml:"azureTenant"`
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AzureClientID string `toml:"azureClientId"`
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AzureClientSecret string `toml:"azureClientSecret"`
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ResourceID string `toml:"resource_id"`
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Region string `toml:"region"`
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Timeout internal.Duration `toml:"Timeout"`
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AzureSubscriptionID string `toml:"azure_subscription"`
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AzureTenantID string `toml:"azure_tenant"`
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AzureClientID string `toml:"azure_client_id"`
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AzureClientSecret string `toml:"azure_client_secret"`
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StringAsDimension bool `toml:"string_as_dimension"`
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useMsi bool
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useMsi bool `toml:"use_managed_service_identity"`
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metadataService *AzureInstanceMetadata
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instanceMetadata *VirtualMachineMetadata
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msiToken *MsiToken
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msiToken *msiToken
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msiResource string
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bearerToken string
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expiryWatermark time.Duration
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@@ -40,7 +42,7 @@ type AzureMonitor struct {
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client *http.Client
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cache map[uint64]azureMonitorMetric
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cache map[string]*azureMonitorMetric
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period time.Duration
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delay time.Duration
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periodStart time.Time
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@@ -75,31 +77,38 @@ type azureMonitorSeries struct {
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}
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var sampleConfig = `
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## The resource ID against which metric will be logged. If not
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## specified, the plugin will attempt to retrieve the resource ID
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## of the VM via the instance metadata service (optional if running
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## on an Azure VM with MSI)
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resourceId = "/subscriptions/3e9c2afc-52b3-4137-9bba-02b6eb204331/resourceGroups/someresourcegroup-rg/providers/Microsoft.Compute/virtualMachines/somevmname"
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## Azure region to publish metrics against. Defaults to eastus
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region = "useast"
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## Maximum duration to wait for HTTP post (in seconds). Defaults to 15
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httpPostTimeout = 15
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## Whether or not to use managed service identity (defaults to true).
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useManagedServiceIdentity = true
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## The resource ID against which metric will be logged. If not
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## specified, the plugin will attempt to retrieve the resource ID
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## of the VM via the instance metadata service (optional if running
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## on an Azure VM with MSI)
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#resource_id = "/subscriptions/<subscription-id>/resourceGroups/<resource-group>/providers/Microsoft.Compute/virtualMachines/<vm-name>"
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## Azure region to publish metrics against. Defaults to eastus.
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## Leave blank to automatically query the region via MSI.
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#region = "useast"
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## Leave this section blank to use Managed Service Identity.
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## TODO
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azureSubscription = "TODO"
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## TODO
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azureTenant = "TODO"
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## TODO
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azureClientId = "TODO"
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## TODO
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azureClientSecret = "TODO"
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## Write HTTP timeout, formatted as a string. If not provided, will default
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## to 5s. 0s means no timeout (not recommended).
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# timeout = "5s"
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## Whether or not to use managed service identity.
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#use_managed_service_identity = true
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## Fill in the following values if using Active Directory Service
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## Principal or User Principal for authentication.
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## Subscription ID
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#azure_subscription = ""
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## Tenant ID
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#azure_tenant = ""
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## Client ID
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#azure_client_id = ""
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## Client secrete
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#azure_client_secret = ""
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`
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const (
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azureMonitorDefaultRegion = "eastus"
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defaultRegion = "eastus"
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defaultMSIResource = "https://monitoring.azure.com/"
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)
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// Connect initializes the plugin and validates connectivity
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@@ -113,18 +122,13 @@ func (a *AzureMonitor) Connect() error {
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return fmt.Errorf("Must provide values for azureSubscription, azureTenant, azureClient and azureClientSecret, or leave all blank to default to MSI")
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}
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if a.useMsi == false {
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if !a.useMsi {
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// If using direct AD authentication create the AD access client
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oauthConfig, err := adal.NewOAuthConfig(azure.PublicCloud.ActiveDirectoryEndpoint, a.AzureTenantID)
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if err != nil {
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return fmt.Errorf("Could not initialize AD client: %s", err)
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}
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a.oauthConfig = oauthConfig
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}
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if a.HTTPPostTimeout == 0 {
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a.HTTPPostTimeout = 10
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}
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a.metadataService = &AzureInstanceMetadata{}
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@@ -133,24 +137,18 @@ func (a *AzureMonitor) Connect() error {
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a.msiResource = "https://monitoring.azure.com/"
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// Validate the resource identifier
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if a.ResourceID == "" {
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metadata, err := a.metadataService.GetInstanceMetadata()
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if err != nil {
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return fmt.Errorf("No resource id specified, and Azure Instance metadata service not available. If not running on an Azure VM, provide a value for resourceId")
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}
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a.ResourceID = metadata.AzureResourceID
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if a.Region == "" {
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a.Region = metadata.Compute.Location
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}
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metadata, err := a.metadataService.GetInstanceMetadata()
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if err != nil {
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return fmt.Errorf("No resource id specified, and Azure Instance metadata service not available. If not running on an Azure VM, provide a value for resourceId")
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}
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a.ResourceID = metadata.AzureResourceID
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if a.Region == "" {
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a.Region = azureMonitorDefaultRegion
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a.Region = metadata.Compute.Location
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}
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// Validate credentials
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err := a.validateCredentials()
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err = a.validateCredentials()
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if err != nil {
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return err
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}
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@@ -161,6 +159,45 @@ func (a *AzureMonitor) Connect() error {
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return nil
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}
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func (a *AzureMonitor) validateCredentials() error {
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// Use managed service identity
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if a.useMsi {
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// Check expiry on the token
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if a.msiToken != nil {
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expiryDuration := a.msiToken.ExpiresInDuration()
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if expiryDuration > a.expiryWatermark {
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return nil
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}
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// Token is about to expire
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log.Printf("Bearer token expiring in %s; acquiring new token\n", expiryDuration.String())
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a.msiToken = nil
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}
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// No token, acquire an MSI token
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if a.msiToken == nil {
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msiToken, err := a.metadataService.getMsiToken(a.AzureClientID, a.msiResource)
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if err != nil {
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return err
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}
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log.Printf("Bearer token acquired; expiring in %s\n", msiToken.ExpiresInDuration().String())
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a.msiToken = msiToken
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a.bearerToken = msiToken.AccessToken
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}
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// Otherwise directory acquire a token
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} else {
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adToken, err := adal.NewServicePrincipalToken(
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*(a.oauthConfig), a.AzureClientID, a.AzureClientSecret,
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azure.PublicCloud.ActiveDirectoryEndpoint)
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if err != nil {
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return fmt.Errorf("Could not acquire ADAL token: %s", err)
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}
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a.adalToken = adToken
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}
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return nil
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}
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// Description provides a description of the plugin
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func (a *AzureMonitor) Description() string {
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return "Configuration for sending aggregate metrics to Azure Monitor"
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@@ -180,9 +217,7 @@ func (a *AzureMonitor) Close() error {
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// Write writes metrics to the remote endpoint
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func (a *AzureMonitor) Write(metrics []telegraf.Metric) error {
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log.Printf("metrics collected: %+v", metrics)
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// Assemble stats on incoming metrics
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// Assemble basic stats on incoming metrics
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for _, metric := range metrics {
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select {
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case a.metrics <- metric:
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@@ -194,257 +229,6 @@ func (a *AzureMonitor) Write(metrics []telegraf.Metric) error {
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return nil
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}
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func (a *AzureMonitor) validateCredentials() error {
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// Use managed service identity
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if a.useMsi {
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// Check expiry on the token
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if a.msiToken != nil {
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expiryDuration := a.msiToken.ExpiresInDuration()
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if expiryDuration > a.expiryWatermark {
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return nil
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}
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// Token is about to expire
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log.Printf("Bearer token expiring in %s; acquiring new token\n", expiryDuration.String())
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a.msiToken = nil
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}
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// No token, acquire an MSI token
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if a.msiToken == nil {
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msiToken, err := a.metadataService.GetMsiToken(a.AzureClientID, a.msiResource)
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if err != nil {
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return err
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}
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log.Printf("Bearer token acquired; expiring in %s\n", msiToken.ExpiresInDuration().String())
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a.msiToken = msiToken
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a.bearerToken = msiToken.AccessToken
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}
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// Otherwise directory acquire a token
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} else {
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adToken, err := adal.NewServicePrincipalToken(
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*(a.oauthConfig), a.AzureClientID, a.AzureClientSecret,
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azure.PublicCloud.ActiveDirectoryEndpoint)
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if err != nil {
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return fmt.Errorf("Could not acquire ADAL token: %s", err)
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}
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a.adalToken = adToken
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}
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return nil
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}
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func (a *AzureMonitor) add(metric telegraf.Metric) {
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id := metric.HashID()
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if azm, ok := a.cache[id]; !ok {
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// hit an uncached metric, create caches for first time:
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var dimensionNames []string
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var dimensionValues []string
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for i, tag := range metric.TagList() {
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// Azure custom metrics service supports up to 10 dimensions
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if i > 9 {
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continue
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}
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dimensionNames = append(dimensionNames, tag.Key)
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dimensionValues = append(dimensionValues, tag.Value)
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}
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// Field keys are stored as the last dimension
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dimensionNames = append(dimensionNames, "field")
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var seriesList []*azureMonitorSeries
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// Store each field as a separate series with field key as a new dimension
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for _, field := range metric.FieldList() {
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azmseries := newAzureMonitorSeries(field, dimensionValues)
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seriesList = append(seriesList, azmseries)
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}
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if len(seriesList) < 1 {
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log.Printf("no valid fields for metric: %s", metric)
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return
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}
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a.cache[id] = azureMonitorMetric{
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Time: metric.Time(),
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Data: &azureMonitorData{
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BaseData: &azureMonitorBaseData{
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Metric: metric.Name(),
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Namespace: "default",
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DimensionNames: dimensionNames,
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Series: seriesList,
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},
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},
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}
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} else {
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for _, f := range metric.FieldList() {
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fv, ok := convert(f.Value)
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if !ok {
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continue
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}
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tmp, ok := azm.findSeriesWithField(f.Key)
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if !ok {
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// hit an uncached field of a cached metric
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var dimensionValues []string
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for i, tag := range metric.TagList() {
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// Azure custom metrics service supports up to 10 dimensions
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if i > 9 {
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continue
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}
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dimensionValues = append(dimensionValues, tag.Value)
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}
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azm.Data.BaseData.Series = append(azm.Data.BaseData.Series, newAzureMonitorSeries(f, dimensionValues))
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continue
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}
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//counter compute
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n := tmp.Count + 1
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tmp.Count = n
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//max/min compute
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if fv < tmp.Min {
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tmp.Min = fv
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} else if fv > tmp.Max {
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tmp.Max = fv
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}
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//sum compute
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tmp.Sum += fv
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//store final data
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a.cache[id].Data.BaseData.Series = append(a.cache[id].Data.BaseData.Series, tmp)
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}
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}
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}
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func (b *azureMonitorMetric) findSeriesWithField(f string) (*azureMonitorSeries, bool) {
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if len(b.Data.BaseData.Series) > 0 {
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for _, s := range b.Data.BaseData.Series {
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if f == s.DimensionValues[len(s.DimensionValues)-1] {
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return s, true
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}
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}
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}
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return nil, false
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}
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func newAzureMonitorSeries(f *telegraf.Field, dv []string) *azureMonitorSeries {
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fv, ok := convert(f.Value)
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if !ok {
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log.Printf("unable to convert field %s (type %T) to float type: %v", f.Key, fv, fv)
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return nil
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}
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return &azureMonitorSeries{
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DimensionValues: append(append([]string{}, dv...), f.Key),
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Min: fv,
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Max: fv,
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Sum: fv,
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Count: 1,
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}
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}
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func (a *AzureMonitor) reset() {
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a.cache = make(map[uint64]azureMonitorMetric)
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}
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func convert(in interface{}) (float64, bool) {
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switch v := in.(type) {
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case int:
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return float64(v), true
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case int8:
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return float64(v), true
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case int16:
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return float64(v), true
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case int32:
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return float64(v), true
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case int64:
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return float64(v), true
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case uint:
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return float64(v), true
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case uint8:
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return float64(v), true
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case uint16:
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return float64(v), true
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case uint32:
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return float64(v), true
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case uint64:
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return float64(v), true
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case float32:
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return float64(v), true
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case float64:
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return v, true
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case string:
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f, err := strconv.ParseFloat(v, 64)
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if err != nil {
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log.Printf("converted string: %s to %v", v, f)
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return 0, false
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}
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return f, true
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default:
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log.Printf("did not convert %T: %s", v, v)
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return 0, false
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}
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}
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func (a *AzureMonitor) push() {
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var body []byte
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for _, metric := range a.cache {
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jsonBytes, err := json.Marshal(&metric)
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log.Printf("marshalled point %s", jsonBytes)
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if err != nil {
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log.Printf("Error marshalling metrics %s", err)
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return
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}
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body = append(body, jsonBytes...)
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body = append(body, '\n')
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}
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log.Printf("Publishing metrics %s", body)
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_, err := a.postData(&body)
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if err != nil {
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log.Printf("Error publishing metrics %s", err)
|
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return
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}
|
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|
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return
|
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}
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|
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func (a *AzureMonitor) postData(msg *[]byte) (*http.Request, error) {
|
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metricsEndpoint := fmt.Sprintf("https://%s.monitoring.azure.com%s/metrics",
|
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a.Region, a.ResourceID)
|
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|
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req, err := http.NewRequest("POST", metricsEndpoint, bytes.NewBuffer(*msg))
|
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if err != nil {
|
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log.Printf("Error creating HTTP request")
|
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return nil, err
|
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}
|
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|
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req.Header.Set("Authorization", "Bearer "+a.bearerToken)
|
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req.Header.Set("Content-Type", "application/x-ndjson")
|
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|
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tr := &http.Transport{
|
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TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
|
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}
|
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client := http.Client{
|
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Transport: tr,
|
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// TODO - fix this
|
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//Timeout: time.Duration(s.HTTPPostTimeout * time.Second),
|
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Timeout: time.Duration(10 * time.Second),
|
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}
|
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resp, err := client.Do(req)
|
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if err != nil {
|
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return req, err
|
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}
|
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|
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defer resp.Body.Close()
|
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if resp.StatusCode >= 300 || resp.StatusCode < 200 {
|
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var reply []byte
|
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reply, err = ioutil.ReadAll(resp.Body)
|
||||
|
||||
if err != nil {
|
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reply = nil
|
||||
}
|
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return req, fmt.Errorf("Post Error. HTTP response code:%d message:%s reply:\n%s",
|
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resp.StatusCode, resp.Status, reply)
|
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}
|
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return req, nil
|
||||
}
|
||||
|
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func (a *AzureMonitor) run() {
|
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// The start of the period is truncated to the nearest minute.
|
||||
//
|
||||
@@ -495,13 +279,214 @@ func (a *AzureMonitor) run() {
|
||||
}
|
||||
}
|
||||
|
||||
func (a *AzureMonitor) reset() {
|
||||
a.cache = make(map[string]*azureMonitorMetric)
|
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}
|
||||
|
||||
func (a *AzureMonitor) add(metric telegraf.Metric) {
|
||||
var dimensionNames []string
|
||||
var dimensionValues []string
|
||||
for i, tag := range metric.TagList() {
|
||||
// Azure custom metrics service supports up to 10 dimensions
|
||||
if i > 10 {
|
||||
continue
|
||||
}
|
||||
dimensionNames = append(dimensionNames, tag.Key)
|
||||
dimensionValues = append(dimensionValues, tag.Value)
|
||||
}
|
||||
|
||||
// Azure Monitoe does not support string value types, so convert string
|
||||
// fields to dimensions if enabled.
|
||||
if a.StringAsDimension {
|
||||
for _, f := range metric.FieldList() {
|
||||
switch fv := f.Value.(type) {
|
||||
case string:
|
||||
dimensionNames = append(dimensionNames, f.Key)
|
||||
dimensionValues = append(dimensionValues, fv)
|
||||
metric.RemoveField(f.Key)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
for _, f := range metric.FieldList() {
|
||||
name := metric.Name() + "_" + f.Key
|
||||
fv, ok := convert(f.Value)
|
||||
if !ok {
|
||||
log.Printf("unable to convert field %s (type %T) to float type: %v", f.Key, fv, fv)
|
||||
continue
|
||||
}
|
||||
|
||||
if azm, ok := a.cache[name]; !ok {
|
||||
// hit an uncached metric, create it for first time
|
||||
a.cache[name] = &azureMonitorMetric{
|
||||
Time: metric.Time(),
|
||||
Data: &azureMonitorData{
|
||||
BaseData: &azureMonitorBaseData{
|
||||
Metric: name,
|
||||
Namespace: "default",
|
||||
DimensionNames: dimensionNames,
|
||||
Series: []*azureMonitorSeries{
|
||||
newAzureMonitorSeries(dimensionValues, fv),
|
||||
},
|
||||
},
|
||||
},
|
||||
}
|
||||
} else {
|
||||
tmp, i, ok := azm.findSeries(dimensionValues)
|
||||
if !ok {
|
||||
// add series new series (should be rare)
|
||||
n := append(azm.Data.BaseData.Series, newAzureMonitorSeries(dimensionValues, fv))
|
||||
a.cache[name].Data.BaseData.Series = n
|
||||
continue
|
||||
}
|
||||
|
||||
//counter compute
|
||||
n := tmp.Count + 1
|
||||
tmp.Count = n
|
||||
//max/min compute
|
||||
if fv < tmp.Min {
|
||||
tmp.Min = fv
|
||||
} else if fv > tmp.Max {
|
||||
tmp.Max = fv
|
||||
}
|
||||
//sum compute
|
||||
tmp.Sum += fv
|
||||
//store final data
|
||||
a.cache[name].Data.BaseData.Series[i] = tmp
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (m *azureMonitorMetric) findSeries(dv []string) (*azureMonitorSeries, int, bool) {
|
||||
if len(m.Data.BaseData.DimensionNames) != len(dv) {
|
||||
return nil, 0, false
|
||||
}
|
||||
for i := range m.Data.BaseData.Series {
|
||||
if m.Data.BaseData.Series[i].equal(dv) {
|
||||
return m.Data.BaseData.Series[i], i, true
|
||||
}
|
||||
}
|
||||
return nil, 0, false
|
||||
}
|
||||
|
||||
func newAzureMonitorSeries(dv []string, fv float64) *azureMonitorSeries {
|
||||
return &azureMonitorSeries{
|
||||
DimensionValues: append([]string{}, dv...),
|
||||
Min: fv,
|
||||
Max: fv,
|
||||
Sum: fv,
|
||||
Count: 1,
|
||||
}
|
||||
}
|
||||
|
||||
func (s *azureMonitorSeries) equal(dv []string) bool {
|
||||
if len(s.DimensionValues) != len(dv) {
|
||||
return false
|
||||
}
|
||||
for i := range dv {
|
||||
if dv[i] != s.DimensionValues[i] {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
func convert(in interface{}) (float64, bool) {
|
||||
switch v := in.(type) {
|
||||
case int64:
|
||||
return float64(v), true
|
||||
case uint64:
|
||||
return float64(v), true
|
||||
case float64:
|
||||
return v, true
|
||||
case bool:
|
||||
if v {
|
||||
return 1, true
|
||||
}
|
||||
return 1, true
|
||||
case string:
|
||||
f, err := strconv.ParseFloat(v, 64)
|
||||
if err != nil {
|
||||
return 0, false
|
||||
}
|
||||
return f, true
|
||||
default:
|
||||
return 0, false
|
||||
}
|
||||
}
|
||||
|
||||
func (a *AzureMonitor) push() {
|
||||
var body []byte
|
||||
for _, metric := range a.cache {
|
||||
jsonBytes, err := json.Marshal(&metric)
|
||||
if err != nil {
|
||||
log.Printf("Error marshalling metrics %s", err)
|
||||
return
|
||||
}
|
||||
body = append(body, jsonBytes...)
|
||||
body = append(body, '\n')
|
||||
}
|
||||
|
||||
_, err := a.postData(&body)
|
||||
if err != nil {
|
||||
log.Printf("Error publishing aggregate metrics %s", err)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (a *AzureMonitor) postData(msg *[]byte) (*http.Request, error) {
|
||||
if err := a.validateCredentials(); err != nil {
|
||||
return nil, fmt.Errorf("Error authenticating: %v", err)
|
||||
}
|
||||
|
||||
metricsEndpoint := fmt.Sprintf("https://%s.monitoring.azure.com%s/metrics",
|
||||
a.Region, a.ResourceID)
|
||||
|
||||
req, err := http.NewRequest("POST", metricsEndpoint, bytes.NewBuffer(*msg))
|
||||
if err != nil {
|
||||
log.Printf("Error creating HTTP request")
|
||||
return nil, err
|
||||
}
|
||||
|
||||
req.Header.Set("Authorization", "Bearer "+a.bearerToken)
|
||||
req.Header.Set("Content-Type", "application/x-ndjson")
|
||||
|
||||
tr := &http.Transport{
|
||||
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
|
||||
}
|
||||
client := http.Client{
|
||||
Transport: tr,
|
||||
Timeout: a.Timeout.Duration,
|
||||
}
|
||||
resp, err := client.Do(req)
|
||||
if err != nil {
|
||||
return req, err
|
||||
}
|
||||
|
||||
defer resp.Body.Close()
|
||||
if resp.StatusCode >= 300 || resp.StatusCode < 200 {
|
||||
var reply []byte
|
||||
reply, err = ioutil.ReadAll(resp.Body)
|
||||
|
||||
if err != nil {
|
||||
reply = nil
|
||||
}
|
||||
return req, fmt.Errorf("Post Error. HTTP response code:%d message:%s reply:\n%s",
|
||||
resp.StatusCode, resp.Status, reply)
|
||||
}
|
||||
return req, nil
|
||||
}
|
||||
|
||||
func init() {
|
||||
outputs.Add("azuremonitor", func() telegraf.Output {
|
||||
return &AzureMonitor{
|
||||
period: time.Minute,
|
||||
delay: time.Second * 5,
|
||||
metrics: make(chan telegraf.Metric, 100),
|
||||
shutdown: make(chan struct{}),
|
||||
StringAsDimension: true,
|
||||
Timeout: internal.Duration{Duration: time.Second * 5},
|
||||
Region: defaultRegion,
|
||||
period: time.Minute,
|
||||
delay: time.Second * 5,
|
||||
metrics: make(chan telegraf.Metric, 100),
|
||||
shutdown: make(chan struct{}),
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user