feat: Add exporter to datadog

docs/examples/datadog_exporter/README.rst

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+Datadog Exporter Example
+=======================
+
+This example shows how to use OpenTelemetry to send tracing data to Datadog.
+
+Installation
+------------
+
+.. code-block:: sh
+
+    pip install opentelemetry-api
+    pip install opentelemetry-sdk
+    pip install opentelemetry-ext-datadog
+
+Run the Example
+---------------
+
+* Start Datadog Agent
+
+.. code-block:: sh
+
+    docker run -d -v /var/run/docker.sock:/var/run/docker.sock:ro \
+        -v /proc/:/host/proc/:ro \
+        -v /sys/fs/cgroup/:/host/sys/fs/cgroup:ro \
+        -p 127.0.0.1:8126:8126/tcp \
+        -e DD_API_KEY="<DATADOG_API_KEY>" \
+        -e DD_APM_ENABLED=true \
+        datadog/agent:latest
+
+* Run the example
+
+.. code-block:: sh
+
+    python datadog_exporter.py
+
+The traces will be available at http://datadoghq.com/.

docs/examples/datadog_exporter/datadog_exporter.py

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+#!/usr/bin/env python3
+#
+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import os
+
+from opentelemetry import trace
+from opentelemetry.ext.datadog import DatadogSpanExporter
+from opentelemetry.sdk.trace import TracerProvider
+from opentelemetry.sdk.trace.export import BatchExportSpanProcessor
+
+trace.set_tracer_provider(TracerProvider())
+tracer = trace.get_tracer(__name__)
+
+exporter = DatadogSpanExporter(agent_url="http://localhost:8126")
+
+span_processor = BatchExportSpanProcessor(exporter)
+trace.get_tracer_provider().add_span_processor(span_processor)
+
+with tracer.start_as_current_span("foo"):
+    with tracer.start_as_current_span("bar"):
+        with tracer.start_as_current_span("baz"):
+            print("Hello world from OpenTelemetry Python!")

ext/opentelemetry-ext-datadog/README.rst

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+OpenTelemetry Datadog Exporter
+==============================
+
+This library allows to export tracing data to `Datadog <https://www.datadoghq.com/>`_.
+
+Installation
+------------
+
+.. code-block:: sh
+
+    pip install opentelemetry-ext-datadog
+
+
+.. _Datadog: https://www.datadoghq.com/
+.. _OpenTelemetry: https://github.com/open-telemetry/opentelemetry-python/
+
+
+References
+----------
+
+* `Datadog <https://www.datadoghq.com/>`_
+* `OpenTelemetry Project <https://opentelemetry.io/>`_

ext/opentelemetry-ext-datadog/setup.cfg

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+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+[metadata]
+name = opentelemetry-ext-datadog
+description = Datadog Exporter for OpenTelemetry
+long_description = file: README.rst
+long_description_content_type = text/x-rst
+author = OpenTelemetry Authors
+author_email = cncf-opentelemetry-contributors@lists.cncf.io
+url = https://github.com/open-telemetry/opentelemetry-python/ext/opentelemetry-ext-datadog
+platforms = any
+license = Apache-2.0
+classifiers =
+    Development Status :: 4 - Beta
+    Intended Audience :: Developers
+    License :: OSI Approved :: Apache Software License
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+
+[options]
+python_requires = >=3.5
+package_dir=
+    =src
+packages=find_namespace:
+install_requires =
+    opentelemetry-api
+    opentelemetry-sdk
+    ddtrace
+
+[options.packages.find]
+where = src

ext/opentelemetry-ext-datadog/setup.py

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+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import os
+
+import setuptools
+
+BASE_DIR = os.path.dirname(__file__)
+VERSION_FILENAME = os.path.join(
+    BASE_DIR, "src", "opentelemetry", "ext", "datadog", "version.py"
+)
+PACKAGE_INFO = {}
+with open(VERSION_FILENAME) as f:
+    exec(f.read(), PACKAGE_INFO)
+
+setuptools.setup(version=PACKAGE_INFO["__version__"])

ext/opentelemetry-ext-datadog/src/opentelemetry/ext/datadog/__init__.py

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+import logging
+import os
+from urllib.parse import urlparse
+
+from ddtrace.encoding import MsgpackEncoder
+from ddtrace.internal.writer import AgentWriter
+from ddtrace.span import Span as DatadogSpan
+
+import opentelemetry.trace as trace_api
+from opentelemetry.sdk.trace import Span
+from opentelemetry.sdk.trace.export import SpanExporter, SpanExportResult
+from opentelemetry.trace.status import StatusCanonicalCode
+
+log = logging.getLogger(__name__)
+
+DEFAULT_AGENT_URL = "http://localhost:8126"
+
+
+class DatadogSpanExporter(SpanExporter):
+    def __init__(self, agent_url=None, service=None):
+        self.agent_url = (
+            agent_url
+            if agent_url
+            else os.environ.get("DD_TRACE_AGENT_URL", DEFAULT_AGENT_URL)
+        )
+        self.service = service if service else os.environ.get("DD_SERVICE")
+        self._agent_writer = None
+
+    @property
+    def agent_writer(self):
+        if self._agent_writer is None:
+            url_parsed = urlparse(self.agent_url)
+            if url_parsed.scheme in ("http", "https"):
+                self._agent_writer = AgentWriter(
+                    hostname=url_parsed.hostname,
+                    port=url_parsed.port,
+                    https=url_parsed.scheme == "https",
+                )
+            elif url_parsed.scheme == "unix":
+                self._agent_writer = AgentWriter(uds_path=url_parsed.path)
+            else:
+                raise ValueError(
+                    "Unknown scheme `%s` for agent URL" % url_parsed.scheme
+                )
+        return self._agent_writer
+
+    def export(self, spans):
+        datadog_spans = self._translate_to_datadog(spans)
+
+        self.agent_writer.write(spans=datadog_spans)
+
+        return SpanExportResult.SUCCESS
+
+    def shutdown(self):
+        if self.agent_writer.started:
+            self.agent_writer.stop()
+            self.agent_writer.join(self.agent_writer.exit_timeout)
+
+    def _translate_to_datadog(self, spans):
+        datadog_spans = []
+
+        for span in spans:
+            trace_id, parent_id, span_id = _get_trace_ids(span)
+
+            # datadog Span is initialized with a reference to the tracer which is
+            # used to record the span when it is finished. We can skip ignore this
+            # because we are not calling the finish method and explictly set the
+            # duration.
+            tracer = None
+
+            datadog_span = DatadogSpan(
+                tracer,
+                span.name,
+                # set service name if root span
+                service=self.service if parent_id == 0 else None,
+                # TODO: Handle resource
+                resource=span.name,
+                trace_id=trace_id,
+                span_id=span_id,
+                parent_id=parent_id,
+            )
+            datadog_span.start_ns = span.start_time
+            datadog_span.duration_ns = span.end_time - span.start_time
+            datadog_span.error = (
+                1
+                if span.status.canonical_code is not StatusCanonicalCode.OK
+                else 0
+            )
+
+            # TODO: Add span type
+            # TODO: Add span tags
+            # TODO: Add exception info
+
+            datadog_spans.append(datadog_span)
+
+        return datadog_spans
+
+
+def _get_trace_ids(span):
+    ctx = span.get_context()
+    trace_id = ctx.trace_id
+    span_id = ctx.span_id
+
+    if isinstance(span.parent, trace_api.Span):
+        parent_id = span.parent.get_context().span_id
+    elif isinstance(span.parent, trace_api.SpanContext):
+        parent_id = span.parent.span_id
+    else:
+        parent_id = 0
+
+    trace_id = _convert_trace_id_uint64(trace_id)
+
+    return trace_id, parent_id, span_id
+
+
+def _convert_trace_id_uint64(otel_id):
+    raw = otel_id.to_bytes(16, "big")
+    return int.from_bytes(raw[8:], byteorder="big")

ext/opentelemetry-ext-datadog/src/opentelemetry/ext/datadog/version.py

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+# Copyright 2019, OpenCensus Authors
+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+__version__ = "0.7.dev0"