internal

Documentation

Index

• Constants
• Variables
• func AgentURLFromEnv() *url.URL
• func BoolEnv(key string, def bool) bool
• func BoolVal(val string, def bool) bool
• func CleanGitMetadataTags(tags map[string]string)
• func ContainerID() string
• func DurationEnv(key string, def time.Duration) time.Duration
• func EntityID() string
• func FloatEnv(key string, def float64) float64
• func ForEachStringTag(str string, delimiter string, fn func(key string, val string))
• func GetGitMetadataTags() map[string]string
• func GetTracerGitMetadataTags() map[string]string
• func IntEnv(key string, def int) int
• func IsExecutionTraced(ctx context.Context) bool
• func ParseTagString(str string) map[string]string
• func RefreshGitMetadataTags()
• func WithExecutionNotTraced(ctx context.Context) context.Context
• func WithExecutionTraced(ctx context.Context) context.Context
• type LockMap
  • func NewLockMap(m map[string]string) *LockMap
  • func (l *LockMap) Clear()
  • func (l *LockMap) Get(k string) string
  • func (l *LockMap) Iter(f func(key string, val string))
  • func (l *LockMap) Len() int
  • func (l *LockMap) Set(k, v string)
• type MetaStructValue
• type StatsdClient
  • func NewStatsdClient(addr string, globalTags []string) (StatsdClient, error)

Constants

const (
	DefaultAgentHostname  = "localhost"
	DefaultTraceAgentPort = "8126"
)

const (
	// EnvGitMetadataEnabledFlag specifies the environment variable name for enable/disable
	EnvGitMetadataEnabledFlag = "DD_TRACE_GIT_METADATA_ENABLED"
	// EnvGitRepositoryURL specifies the environment variable name for git repository URL
	EnvGitRepositoryURL = "DD_GIT_REPOSITORY_URL"
	// EnvGitCommitSha specifies the environment variable name git commit sha
	EnvGitCommitSha = "DD_GIT_COMMIT_SHA"
	// EnvDDTags specifies the environment variable name global tags
	EnvDDTags = "DD_TAGS"

	// TagRepositoryURL specifies the tag name for git repository URL
	TagRepositoryURL = "git.repository_url"
	// TagCommitSha specifies the tag name for git commit sha
	TagCommitSha = "git.commit.sha"
	// TagGoPath specifies the tag name for go module path
	TagGoPath = "go_path"

	// TraceTagRepositoryURL specifies the trace tag name for git repository URL
	TraceTagRepositoryURL = "_dd.git.repository_url"
	// TraceTagCommitSha specifies the trace tag name for git commit sha
	TraceTagCommitSha = "_dd.git.commit.sha"
	// TraceTagGoPath specifies the trace tag name for go module path
	TraceTagGoPath = "_dd.go_path"
)

const DDTagsDelimiter = ":"

DDTagsDelimiter is the separator between key-val pairs for DD env vars

const DefaultDogstatsdAddr = "localhost:8125"

const OtelTagsDelimeter = "="

OtelTagsDelimeter is the separator between key-val pairs for OTEL env vars

Variables

var ActiveSpanKey = contextKey{}

ActiveSpanKey is used to set tracer context on a context.Context objects with a unique key

var DefaultTraceAgentUDSPath = "/var/run/datadog/apm.socket"

This is a variable rather than a constant so it can be replaced in unit tests

Functions

func AgentURLFromEnv

func AgentURLFromEnv() *url.URL

AgentURLFromEnv resolves the URL for the trace agent based on the default host/port and UDS path, and via standard environment variables. AgentURLFromEnv has the following priority order:

• First, DD_TRACE_AGENT_URL if it is set
• Then, if either of DD_AGENT_HOST and DD_TRACE_AGENT_PORT are set, use http://DD_AGENT_HOST:DD_TRACE_AGENT_PORT, defaulting to localhost and 8126, respectively
• Then, DefaultTraceAgentUDSPath, if the path exists
• Finally, localhost:8126

func BoolEnv

func BoolEnv(key string, def bool) bool

BoolEnv returns the parsed boolean value of an environment variable, or def otherwise.

func BoolVal

func BoolVal(val string, def bool) bool

BoolVal returns the parsed boolean value of string val, or def if not parseable

func CleanGitMetadataTags

func CleanGitMetadataTags(tags map[string]string)

CleanGitMetadataTags cleans up tags from git metadata

func ContainerID

func ContainerID() string

ContainerID attempts to return the container ID from /proc/self/cgroup or empty on failure.

func DurationEnv

func DurationEnv(key string, def time.Duration) time.Duration

DurationEnv returns the parsed duration value of an environment variable, or def otherwise.

func EntityID

func EntityID() string

EntityID attempts to return the container ID or the cgroup node controller's inode if the container ID is not available. The cid is prefixed with `cid-` and the inode with `in-`.

func FloatEnv

func FloatEnv(key string, def float64) float64

FloatEnv returns the parsed float64 value of an environment variable, or def otherwise.

func ForEachStringTag

func ForEachStringTag(str string, delimiter string, fn func(key string, val string))

ForEachStringTag runs fn on every key val pair encountered in str. str may contain multiple key val pairs separated by either space or comma (but not a mixture of both), and each key val pair is separated by a delimiter.

func GetGitMetadataTags

func GetGitMetadataTags() map[string]string

GetGitMetadataTags returns git metadata tags. Returned map is read-only

func GetTracerGitMetadataTags

func GetTracerGitMetadataTags() map[string]string

GetTracerGitMetadataTags returns git metadata tags for tracer NB: Currently tracer inject tags with some workaround (only with _dd prefix and only for the first span in payload) So we provide different tag names

func IntEnv

func IntEnv(key string, def int) int

IntEnv returns the parsed int value of an environment variable, or def otherwise.

func IsExecutionTraced

func IsExecutionTraced(ctx context.Context) bool

IsExecutionTraced returns whether ctx is associated with an execution trace task, as indicated via WithExecutionTraced

func ParseTagString

func ParseTagString(str string) map[string]string

ParseTagString returns tags parsed from string as map

func RefreshGitMetadataTags

func RefreshGitMetadataTags()

RefreshGitMetadataTags reset cached metadata tags. NOT thread-safe, use for testing only

func WithExecutionNotTraced

func WithExecutionNotTraced(ctx context.Context) context.Context

WithExecutionNotTraced marks that the context is *not* covered by an execution trace task. This is intended to prevent child spans (which inherit information from ctx) from being considered covered by a task, when an integration may create its own child span with its own execution trace task.

func WithExecutionTraced

func WithExecutionTraced(ctx context.Context) context.Context

WithExecutionTraced marks ctx as being associated with an execution trace task. It is assumed that ctx already contains a trace task. The caller is responsible for ending the task.

This is intended for a specific case where the database/sql contrib package only creates spans *after* an operation, in case the operation was unavailable, and thus execution trace tasks tied to the span only capture the very end. This function enables creating a task *before* creating a span, and communicating to the APM tracer that it does not need to create a task. In general, APM instrumentation should prefer creating tasks around the operation rather than after the fact, if possible.

Types

type LockMap

type LockMap struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

LockMap uses an RWMutex to synchronize map access to allow for concurrent access. This should not be used for cases with heavy write load and performance concerns.

func NewLockMap

func NewLockMap(m map[string]string) *LockMap

func (*LockMap) Clear

func (l *LockMap) Clear()

func (*LockMap) Get

func (l *LockMap) Get(k string) string

func (*LockMap) Iter

func (l *LockMap) Iter(f func(key string, val string))

Iter iterates over all the map entries passing in keys and values to provided func f. Note this is READ ONLY.

func (*LockMap) Len

func (l *LockMap) Len() int

func (*LockMap) Set

func (l *LockMap) Set(k, v string)

type MetaStructValue

type MetaStructValue struct {
	Value any // TODO: further constraining Value's type, especially if it becomes public
}

MetaStructValue is a custom type wrapper used to send metadata to the agent via the `meta_struct` field instead of the `meta` inside a span.

type StatsdClient

type StatsdClient interface {
	Incr(name string, tags []string, rate float64) error
	Count(name string, value int64, tags []string, rate float64) error
	Gauge(name string, value float64, tags []string, rate float64) error
	Timing(name string, value time.Duration, tags []string, rate float64) error
	Flush() error
	Close() error
}

func NewStatsdClient

func NewStatsdClient(addr string, globalTags []string) (StatsdClient, error)

NewStatsdClient returns a new statsd client with the provided address and globaltags