Documentation
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Overview ¶
Package telemetry records what 012 spends its time on, as structured events written with log/slog. It is off unless a destination is given: a JSON log file (012 --log path, or O12_LOG), one line per event that DuckDB or an OpenTelemetry Collector's filelog receiver can read, and/or an OTLP/HTTP endpoint (012 --otlp URL, or OTEL_EXPORTER_OTLP_ENDPOINT) that gets the events as logs, spans as traces and frame summaries as metrics. Stdout belongs to the terminal UI. See docs/observability.md.
Events carry sizes, counts and durations only: never cell contents, file contents or secrets.
The API is small on purpose, so call sites stay few and backends can change behind it without touching them.
Index ¶
- func Close() error
- func Debug(name string, d time.Duration, attrs ...slog.Attr)
- func Enabled() bool
- func Event(name string, d time.Duration, attrs ...slog.Attr)
- func Frame(render, key time.Duration)
- func Logger() *slog.Logger
- func Set(name string, v int64)
- func Setup(c Config) (func() error, error)
- func WithParent(ctx context.Context, p Parent) context.Context
- type Config
- type OTLPConfig
- type Parent
- type Span
- type Trace
- func (t *Trace) Begin(name string)
- func (t *Trace) End(attrs ...slog.Attr) bool
- func (t *Trace) Enter(p Parent) int
- func (t *Trace) Event(name string, d time.Duration, attrs ...slog.Attr)
- func (t *Trace) Leave(depth int)
- func (t *Trace) Parent() Parent
- func (t *Trace) Start(name string, attrs ...slog.Attr) Span
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func Close ¶
func Close() error
Close stops recording, sends what OTLP has queued (waiting at most about one request timeout) and closes the log file.
func Debug ¶
Debug logs a finished operation at Debug level, for events too frequent to keep by default (and to send as spans).
func Frame ¶
Frame records a frame that took render to draw. key is how long ago the key press it answers happened, or 0 when it answers none.
func Set ¶
Set records a gauge, such as the number of cells or JEV questions waiting, reported with the next frame summary.
Types ¶
type Config ¶
type Config struct {
// LogPath is the JSON log file, appended to. Empty (and no OTLP)
// turns telemetry off.
LogPath string
// Level is the least severe level logged; Info by default. Debug adds
// an event for every frame and every command.
Level slog.Level
// Version is 012's version or commit, added to the start event and
// sent as the OTLP service.version.
Version string
// OTLP sends events to an OpenTelemetry endpoint too, or instead.
OTLP OTLPConfig
}
Config says where events go.
func ConfigFromEnv ¶
func ConfigFromEnv() Config
ConfigFromEnv reads O12_LOG, O12_LOG_LEVEL (debug, info, warn) and the standard OTEL_* variables described at OTLPConfig.
type OTLPConfig ¶
type OTLPConfig struct {
// Endpoint is the base URL, like http://localhost:4318, to which
// /v1/logs, /v1/traces and /v1/metrics are appended
// (OTEL_EXPORTER_OTLP_ENDPOINT, or 012 --otlp).
Endpoint string
// LogsEndpoint, TracesEndpoint and MetricsEndpoint are full URLs for
// one signal each, used as they are
// (OTEL_EXPORTER_OTLP_{LOGS,TRACES,METRICS}_ENDPOINT).
LogsEndpoint, TracesEndpoint, MetricsEndpoint string
// NoLogs, NoTraces and NoMetrics leave a signal out
// (OTEL_{LOGS,TRACES,METRICS}_EXPORTER=none).
NoLogs, NoTraces, NoMetrics bool
// Headers go with every request, e.g. for authentication
// (OTEL_EXPORTER_OTLP_HEADERS). They are never logged.
Headers map[string]string
// Resource adds resource attributes (OTEL_RESOURCE_ATTRIBUTES);
// service.name stays 012.
Resource map[string]string
// Timeout bounds each request (OTEL_EXPORTER_OTLP_TIMEOUT, in
// milliseconds); 3 s when zero.
Timeout time.Duration
// NoCompression sends plain JSON instead of gzip
// (OTEL_EXPORTER_OTLP_COMPRESSION=none).
NoCompression bool
// Disabled turns OTLP off whatever else is set (OTEL_SDK_DISABLED).
Disabled bool
}
OTLPConfig says where OTLP goes. ConfigFromEnv reads it from the standard OTEL_* variables. Nothing is sent unless an endpoint is set.
type Parent ¶
type Parent struct {
// contains filtered or unexported fields
}
Parent identifies a span that others can nest under, from any goroutine. The zero Parent is none: spans under it are roots, each in a trace of its own.
func ParentFrom ¶
ParentFrom is the Parent ctx carries, zero if none.
type Span ¶
type Span struct {
// contains filtered or unexported fields
}
Span times one operation. The zero Span, returned while off, does nothing. With OTLP on it is sent as a span, and the log record of the same event carries its trace, span and parent ids.
func Start ¶
Start begins timing an operation named like "recalc" or "import", with up to four attributes known at the start, as a root span.
func (Span) End ¶
End logs the operation with its duration in milliseconds and any attributes learned along the way, such as rows read. A span started through a Trace is no longer open in it.
type Trace ¶
type Trace struct {
// contains filtered or unexported fields
}
Trace is the spans open in one thread of work, innermost last: one UI program's, or one import's. Spans started through it nest under the innermost open span, and stay open in it until they end. It belongs to one goroutine at a time, like the Model or workbook that keeps it. A nil *Trace works too, with nothing open.
func NewTrace ¶
NewTrace returns a Trace with base open, if it isn't zero, beneath everything started through it.
func (*Trace) Begin ¶
Begin starts a span like Start and keeps it for End, for code that has nowhere to keep a Span, such as the engine's hooks (see cmd/012). On a nil Trace it does nothing.
func (*Trace) Enter ¶
Enter makes p the innermost open span, until Leave with the depth it returns: for a span that lives across several updates (a macro run, a session) to hold what each of them starts.
Source Files