TraceLite

from tracelite.tracer import TracerProvider
from tracelite.span import Resource, SpanKind
from tracelite.processor import SimpleSpanProcessor
from tracelite.exporter import ConsoleExporter

provider = TracerProvider(
    resource=Resource(attributes={"service.name": "my-api"})
)
provider.add_processor(SimpleSpanProcessor(ConsoleExporter()))
tracer = provider.get_tracer()

with tracer.start_span("GET /users", kind=SpanKind.SERVER) as span:
    span.set_attribute("http.method", "GET")

    with tracer.start_span("fetch_from_db") as db:
        db.set_attribute("db.system", "postgresql")
        # ...your query runs here...

    span.set_attribute("http.status_code", 200)

from tracelite.propagator import W3CTraceContextPropagator
from tracelite.context import SpanContext

propagator = W3CTraceContextPropagator()

# Service A: inject into outgoing request
with tracer.start_span("call-service-b", kind=SpanKind.CLIENT) as span:
    headers = {}
    ctx = SpanContext(span.trace_id, span.span_id, trace_flags=1)
    propagator.inject(ctx, headers)
    # → {"traceparent": "00-4bf92f...-00f067...-01"}

# Service B: extract from incoming request
parent = propagator.extract(incoming_headers)
with tracer.start_span("handle-request", parent=parent) as span:
    # Same trace_id, linked as child span
    pass