491 lines
15 KiB
Go
491 lines
15 KiB
Go
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//go:generate ../../../tools/config_includer/generator
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//go:generate ../../../tools/readme_config_includer/generator
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package gnmi
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import (
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"context"
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_ "embed"
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"errors"
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"fmt"
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"net"
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"strings"
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"sync"
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"time"
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"github.com/google/gnxi/utils/xpath"
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"github.com/openconfig/gnmi/proto/gnmi"
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"github.com/openconfig/gnmi/proto/gnmi_ext"
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"google.golang.org/grpc/keepalive"
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"google.golang.org/grpc/metadata"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/config"
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"github.com/influxdata/telegraf/internal/choice"
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common_tls "github.com/influxdata/telegraf/plugins/common/tls"
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"github.com/influxdata/telegraf/plugins/common/yangmodel"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
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//go:embed sample.conf
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var sampleConfig string
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// Currently supported GNMI Extensions
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var supportedExtensions = []string{"juniper_header"}
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// Define the warning to show if we cannot get a metric name.
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const emptyNameWarning = `Got empty metric-name for response (field %q), usually
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indicating configuration issues as the response cannot be related to any
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subscription.Please open an issue on https://github.com/influxdata/telegraf
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including your device model and the following response data:
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%+v
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This message is only printed once.`
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type GNMI struct {
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Addresses []string `toml:"addresses"`
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Subscriptions []subscription `toml:"subscription"`
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TagSubscriptions []tagSubscription `toml:"tag_subscription"`
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Aliases map[string]string `toml:"aliases"`
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Encoding string `toml:"encoding"`
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Origin string `toml:"origin"`
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Prefix string `toml:"prefix"`
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Target string `toml:"target"`
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UpdatesOnly bool `toml:"updates_only"`
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VendorSpecific []string `toml:"vendor_specific"`
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Username config.Secret `toml:"username"`
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Password config.Secret `toml:"password"`
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Redial config.Duration `toml:"redial"`
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MaxMsgSize config.Size `toml:"max_msg_size"`
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Depth int32 `toml:"depth"`
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Trace bool `toml:"dump_responses"`
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CanonicalFieldNames bool `toml:"canonical_field_names"`
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TrimFieldNames bool `toml:"trim_field_names"`
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PrefixTagKeyWithPath bool `toml:"prefix_tag_key_with_path"`
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GuessPathTag bool `toml:"guess_path_tag" deprecated:"1.30.0;1.35.0;use 'path_guessing_strategy' instead"`
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GuessPathStrategy string `toml:"path_guessing_strategy"`
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EnableTLS bool `toml:"enable_tls" deprecated:"1.27.0;1.35.0;use 'tls_enable' instead"`
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KeepaliveTime config.Duration `toml:"keepalive_time"`
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KeepaliveTimeout config.Duration `toml:"keepalive_timeout"`
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YangModelPaths []string `toml:"yang_model_paths"`
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EnforceFirstNamespaceAsOrigin bool `toml:"enforce_first_namespace_as_origin"`
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Log telegraf.Logger `toml:"-"`
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common_tls.ClientConfig
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// Internal state
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internalAliases map[*pathInfo]string
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decoder *yangmodel.Decoder
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cancel context.CancelFunc
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wg sync.WaitGroup
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}
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type subscription struct {
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Name string `toml:"name"`
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Origin string `toml:"origin"`
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Path string `toml:"path"`
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SubscriptionMode string `toml:"subscription_mode"`
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SampleInterval config.Duration `toml:"sample_interval"`
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SuppressRedundant bool `toml:"suppress_redundant"`
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HeartbeatInterval config.Duration `toml:"heartbeat_interval"`
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TagOnly bool `toml:"tag_only" deprecated:"1.25.0;1.35.0;please use 'tag_subscription's instead"`
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fullPath *gnmi.Path
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}
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type tagSubscription struct {
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subscription
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Match string `toml:"match"`
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Elements []string `toml:"elements"`
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}
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func (*GNMI) SampleConfig() string {
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return sampleConfig
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}
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func (c *GNMI) Init() error {
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// Check options
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switch c.Encoding {
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case "":
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c.Encoding = "proto"
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case "proto", "json", "json_ietf", "bytes":
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// Do nothing, those are valid
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default:
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return fmt.Errorf("unsupported encoding %s", c.Encoding)
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}
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if time.Duration(c.Redial) <= 0 {
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return errors.New("redial duration must be positive")
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}
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// Check vendor_specific options configured by user
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if err := choice.CheckSlice(c.VendorSpecific, supportedExtensions); err != nil {
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return fmt.Errorf("unsupported vendor_specific option: %w", err)
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}
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// Check path guessing and handle deprecated option
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if c.GuessPathTag {
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if c.GuessPathStrategy == "" {
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c.GuessPathStrategy = "common path"
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}
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if c.GuessPathStrategy != "common path" {
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return errors.New("conflicting settings between 'guess_path_tag' and 'path_guessing_strategy'")
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}
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}
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switch c.GuessPathStrategy {
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case "", "none", "common path", "subscription":
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default:
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return fmt.Errorf("invalid 'path_guessing_strategy' %q", c.GuessPathStrategy)
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}
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// Use the new TLS option for enabling
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// Honor deprecated option
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enable := (c.ClientConfig.Enable != nil && *c.ClientConfig.Enable) || c.EnableTLS
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c.ClientConfig.Enable = &enable
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// Split the subscriptions into "normal" and "tag" subscription
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// and prepare them.
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for i := len(c.Subscriptions) - 1; i >= 0; i-- {
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subscription := c.Subscriptions[i]
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// Check the subscription
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if subscription.Name == "" {
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return fmt.Errorf("empty 'name' found for subscription %d", i+1)
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}
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if subscription.Path == "" {
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return fmt.Errorf("empty 'path' found for subscription %d", i+1)
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}
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// Support and convert legacy TagOnly subscriptions
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if subscription.TagOnly {
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tagSub := tagSubscription{
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subscription: subscription,
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Match: "name",
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}
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c.TagSubscriptions = append(c.TagSubscriptions, tagSub)
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// Remove from the original subscriptions list
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c.Subscriptions = append(c.Subscriptions[:i], c.Subscriptions[i+1:]...)
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continue
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}
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if err := subscription.buildFullPath(c); err != nil {
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return err
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}
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}
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for idx := range c.TagSubscriptions {
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if err := c.TagSubscriptions[idx].buildFullPath(c); err != nil {
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return err
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}
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if c.TagSubscriptions[idx].TagOnly != c.TagSubscriptions[0].TagOnly {
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return errors.New("do not mix legacy tag_only subscriptions and tag subscriptions")
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}
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switch c.TagSubscriptions[idx].Match {
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case "":
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if len(c.TagSubscriptions[idx].Elements) > 0 {
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c.TagSubscriptions[idx].Match = "elements"
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} else {
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c.TagSubscriptions[idx].Match = "name"
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}
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case "unconditional":
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case "name":
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case "elements":
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if len(c.TagSubscriptions[idx].Elements) == 0 {
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return errors.New("tag_subscription must have at least one element")
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}
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default:
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return fmt.Errorf("unknown match type %q for tag-subscription %q", c.TagSubscriptions[idx].Match, c.TagSubscriptions[idx].Name)
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}
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}
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// Invert explicit alias list and prefill subscription names
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c.internalAliases = make(map[*pathInfo]string, len(c.Subscriptions)+len(c.Aliases)+len(c.TagSubscriptions))
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for _, s := range c.Subscriptions {
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if err := s.buildAlias(c.internalAliases, c.EnforceFirstNamespaceAsOrigin); err != nil {
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return err
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}
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}
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for _, s := range c.TagSubscriptions {
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if err := s.buildAlias(c.internalAliases, c.EnforceFirstNamespaceAsOrigin); err != nil {
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return err
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}
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}
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for alias, encodingPath := range c.Aliases {
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path := newInfoFromString(encodingPath)
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if c.EnforceFirstNamespaceAsOrigin {
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path.enforceFirstNamespaceAsOrigin()
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}
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c.internalAliases[path] = alias
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}
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c.Log.Debugf("Internal alias mapping: %+v", c.internalAliases)
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// Warn about configures insecure cipher suites
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insecure := common_tls.InsecureCiphers(c.ClientConfig.TLSCipherSuites)
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if len(insecure) > 0 {
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c.Log.Warnf("Configured insecure cipher suites: %s", strings.Join(insecure, ","))
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}
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// Check the TLS configuration
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if _, err := c.ClientConfig.TLSConfig(); err != nil {
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if errors.Is(err, common_tls.ErrCipherUnsupported) {
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secure, insecure := common_tls.Ciphers()
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c.Log.Info("Supported secure ciphers:")
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for _, name := range secure {
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c.Log.Infof(" %s", name)
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}
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c.Log.Info("Supported insecure ciphers:")
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for _, name := range insecure {
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c.Log.Infof(" %s", name)
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}
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}
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return err
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}
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// Load the YANG models if specified by the user
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if len(c.YangModelPaths) > 0 {
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decoder, err := yangmodel.NewDecoder(c.YangModelPaths...)
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if err != nil {
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return fmt.Errorf("creating YANG model decoder failed: %w", err)
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}
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c.decoder = decoder
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}
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return nil
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}
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func (c *GNMI) Start(acc telegraf.Accumulator) error {
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// Validate configuration
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request, err := c.newSubscribeRequest()
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if err != nil {
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return err
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}
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// Generate TLS config if enabled
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tlscfg, err := c.ClientConfig.TLSConfig()
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if err != nil {
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return err
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}
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// Prepare the context, optionally with credentials
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var ctx context.Context
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ctx, c.cancel = context.WithCancel(context.Background())
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if !c.Username.Empty() {
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usernameSecret, err := c.Username.Get()
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if err != nil {
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return fmt.Errorf("getting username failed: %w", err)
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}
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username := usernameSecret.String()
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usernameSecret.Destroy()
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passwordSecret, err := c.Password.Get()
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if err != nil {
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return fmt.Errorf("getting password failed: %w", err)
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}
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password := passwordSecret.String()
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passwordSecret.Destroy()
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ctx = metadata.AppendToOutgoingContext(ctx, "username", username, "password", password)
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}
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// Create a goroutine for each device, dial and subscribe
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c.wg.Add(len(c.Addresses))
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for _, addr := range c.Addresses {
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go func(addr string) {
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defer c.wg.Done()
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host, port, err := net.SplitHostPort(addr)
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if err != nil {
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acc.AddError(fmt.Errorf("unable to parse address %s: %w", addr, err))
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return
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}
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h := handler{
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host: host,
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port: port,
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aliases: c.internalAliases,
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tagsubs: c.TagSubscriptions,
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maxMsgSize: int(c.MaxMsgSize),
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vendorExt: c.VendorSpecific,
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tagStore: newTagStore(c.TagSubscriptions),
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trace: c.Trace,
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canonicalFieldNames: c.CanonicalFieldNames,
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trimSlash: c.TrimFieldNames,
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tagPathPrefix: c.PrefixTagKeyWithPath,
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guessPathStrategy: c.GuessPathStrategy,
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decoder: c.decoder,
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enforceFirstNamespaceAsOrigin: c.EnforceFirstNamespaceAsOrigin,
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log: c.Log,
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ClientParameters: keepalive.ClientParameters{
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Time: time.Duration(c.KeepaliveTime),
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Timeout: time.Duration(c.KeepaliveTimeout),
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PermitWithoutStream: false,
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},
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}
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for ctx.Err() == nil {
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if err := h.subscribeGNMI(ctx, acc, tlscfg, request); err != nil && ctx.Err() == nil {
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acc.AddError(err)
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}
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select {
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case <-ctx.Done():
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case <-time.After(time.Duration(c.Redial)):
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}
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}
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}(addr)
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}
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return nil
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}
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func (*GNMI) Gather(telegraf.Accumulator) error {
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return nil
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}
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func (c *GNMI) Stop() {
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c.cancel()
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c.wg.Wait()
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}
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func (s *subscription) buildSubscription() (*gnmi.Subscription, error) {
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gnmiPath, err := parsePath(s.Origin, s.Path, "")
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if err != nil {
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return nil, err
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}
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mode, ok := gnmi.SubscriptionMode_value[strings.ToUpper(s.SubscriptionMode)]
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if !ok {
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return nil, fmt.Errorf("invalid subscription mode %s", s.SubscriptionMode)
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}
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return &gnmi.Subscription{
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Path: gnmiPath,
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Mode: gnmi.SubscriptionMode(mode),
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HeartbeatInterval: uint64(time.Duration(s.HeartbeatInterval).Nanoseconds()),
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SampleInterval: uint64(time.Duration(s.SampleInterval).Nanoseconds()),
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SuppressRedundant: s.SuppressRedundant,
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}, nil
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}
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// Create a new gNMI SubscribeRequest
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func (c *GNMI) newSubscribeRequest() (*gnmi.SubscribeRequest, error) {
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// Create subscription objects
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subscriptions := make([]*gnmi.Subscription, 0, len(c.Subscriptions)+len(c.TagSubscriptions))
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for _, subscription := range c.TagSubscriptions {
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sub, err := subscription.buildSubscription()
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if err != nil {
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return nil, err
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||
|
|
}
|
||
|
|
subscriptions = append(subscriptions, sub)
|
||
|
|
}
|
||
|
|
for _, subscription := range c.Subscriptions {
|
||
|
|
sub, err := subscription.buildSubscription()
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
subscriptions = append(subscriptions, sub)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Construct subscribe request
|
||
|
|
gnmiPath, err := parsePath(c.Origin, c.Prefix, c.Target)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
// Do not provide an empty prefix. Required for Huawei NE40 router v8.21
|
||
|
|
// (and possibly others). See https://github.com/influxdata/telegraf/issues/12273.
|
||
|
|
if gnmiPath.Origin == "" && gnmiPath.Target == "" && len(gnmiPath.Elem) == 0 {
|
||
|
|
gnmiPath = nil
|
||
|
|
}
|
||
|
|
|
||
|
|
if c.Encoding != "proto" && c.Encoding != "json" && c.Encoding != "json_ietf" && c.Encoding != "bytes" {
|
||
|
|
return nil, fmt.Errorf("unsupported encoding %s", c.Encoding)
|
||
|
|
}
|
||
|
|
|
||
|
|
var extensions []*gnmi_ext.Extension
|
||
|
|
if c.Depth > 0 {
|
||
|
|
extensions = []*gnmi_ext.Extension{
|
||
|
|
{
|
||
|
|
Ext: &gnmi_ext.Extension_Depth{
|
||
|
|
Depth: &gnmi_ext.Depth{
|
||
|
|
Level: uint32(c.Depth),
|
||
|
|
},
|
||
|
|
},
|
||
|
|
},
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return &gnmi.SubscribeRequest{
|
||
|
|
Request: &gnmi.SubscribeRequest_Subscribe{
|
||
|
|
Subscribe: &gnmi.SubscriptionList{
|
||
|
|
Prefix: gnmiPath,
|
||
|
|
Mode: gnmi.SubscriptionList_STREAM,
|
||
|
|
Encoding: gnmi.Encoding(gnmi.Encoding_value[strings.ToUpper(c.Encoding)]),
|
||
|
|
Subscription: subscriptions,
|
||
|
|
UpdatesOnly: c.UpdatesOnly,
|
||
|
|
},
|
||
|
|
},
|
||
|
|
Extension: extensions,
|
||
|
|
}, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// ParsePath from XPath-like string to gNMI path structure
|
||
|
|
func parsePath(origin, pathToParse, target string) (*gnmi.Path, error) {
|
||
|
|
gnmiPath, err := xpath.ToGNMIPath(pathToParse)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
gnmiPath.Origin = origin
|
||
|
|
gnmiPath.Target = target
|
||
|
|
return gnmiPath, err
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *subscription) buildFullPath(c *GNMI) error {
|
||
|
|
var err error
|
||
|
|
if s.fullPath, err = xpath.ToGNMIPath(s.Path); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
s.fullPath.Origin = s.Origin
|
||
|
|
s.fullPath.Target = c.Target
|
||
|
|
if c.Prefix != "" {
|
||
|
|
prefix, err := xpath.ToGNMIPath(c.Prefix)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
s.fullPath.Elem = append(prefix.Elem, s.fullPath.Elem...)
|
||
|
|
if s.Origin == "" && c.Origin != "" {
|
||
|
|
s.fullPath.Origin = c.Origin
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *subscription) buildAlias(aliases map[*pathInfo]string, enforceFirstNamespaceAsOrigin bool) error {
|
||
|
|
// Build the subscription path without keys
|
||
|
|
path, err := parsePath(s.Origin, s.Path, "")
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
info := newInfoFromPathWithoutKeys(path)
|
||
|
|
if enforceFirstNamespaceAsOrigin {
|
||
|
|
info.enforceFirstNamespaceAsOrigin()
|
||
|
|
}
|
||
|
|
|
||
|
|
// If the user didn't provide a measurement name, use last path element
|
||
|
|
name := s.Name
|
||
|
|
if name == "" && len(info.segments) > 0 {
|
||
|
|
name = info.segments[len(info.segments)-1].id
|
||
|
|
}
|
||
|
|
if name != "" {
|
||
|
|
aliases[info] = name
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
inputs.Add("gnmi", func() telegraf.Input {
|
||
|
|
return &GNMI{
|
||
|
|
Redial: config.Duration(10 * time.Second),
|
||
|
|
EnforceFirstNamespaceAsOrigin: true,
|
||
|
|
}
|
||
|
|
})
|
||
|
|
// Backwards compatible alias:
|
||
|
|
inputs.Add("cisco_telemetry_gnmi", func() telegraf.Input {
|
||
|
|
return &GNMI{
|
||
|
|
Redial: config.Duration(10 * time.Second),
|
||
|
|
EnforceFirstNamespaceAsOrigin: true,
|
||
|
|
}
|
||
|
|
})
|
||
|
|
}
|