LS-5226: Add support for Proto over HTTP

- Fixed an issue in examples where argparser will not parse bool
as expected (use_tls)
- Added options to Tracer use_thrift or use_http
- Created Converter abstract class, either a Thrift or an HTTP
converter will be used
- Implemented HTTPConnection

Author: frenchfrywpepper

examples/http/context_in_headers.py

@@ -31,6 +31,7 @@
 import opentracing.ext.tags
 import lightstep
 
+
 class RemoteHandler(BaseHTTPRequestHandler):
     """This handler receives the request from the client.
     """
@@ -121,18 +122,23 @@ def lightstep_tracer_from_args():
             default='collector.lightstep.com')
     parser.add_argument('--port', help='The LightStep reporting service port.',
             type=int, default=443)
-    parser.add_argument('--use_tls', help='Whether to use TLS for reporting',
-            type=bool, default=True)
+    parser.add_argument('--use_tls', help='Use TLS for reporting',
+                        dest="use_tls", action='store_true')
     parser.add_argument('--component_name', help='The LightStep component name',
             default='TrivialExample')
     args = parser.parse_args()
 
+    if args.use_tls:
+        collector_encryption = 'tls'
+    else:
+        collector_encryption = 'none'
+
     return lightstep.Tracer(
             component_name=args.component_name,
             access_token=args.token,
             collector_host=args.host,
             collector_port=args.port,
-            collector_encryption=('tls' if args.use_tls else 'none'),
+            collector_encryption=collector_encryption,
             )
 
 

examples/nontrivial/main.py

@@ -3,7 +3,6 @@
 library.
 """
 import argparse
-import contextlib
 import sys
 import time
 import threading
@@ -16,13 +15,15 @@
 import opentracing
 import lightstep
 
+
 def sleep_dot():
     """Short sleep and writes a dot to the STDOUT.
     """
     time.sleep(0.05)
     sys.stdout.write('.')
     sys.stdout.flush()
 
+
 def add_spans():
     """Calls the opentracing API, doesn't use any LightStep-specific code.
     """
@@ -69,18 +70,23 @@ def lightstep_tracer_from_args():
                         default='collector.lightstep.com')
     parser.add_argument('--port', help='The LightStep reporting service port.',
                         type=int, default=443)
-    parser.add_argument('--use_tls', help='Whether to use TLS for reporting',
-                        type=bool, default=True)
+    parser.add_argument('--use_tls', help='Use TLS for reporting',
+                        dest="use_tls", action='store_true')
     parser.add_argument('--component_name', help='The LightStep component name',
                         default='NonTrivialExample')
     args = parser.parse_args()
 
+    if args.use_tls:
+        collector_encryption = 'tls'
+    else:
+        collector_encryption = 'none'
+
     return lightstep.Tracer(
-	    component_name=args.component_name,
-	    access_token=args.token,
-	    collector_host=args.host,
-	    collector_port=args.port,
-        collector_encryption=('tls' if args.use_tls else 'none'))
+        component_name=args.component_name,
+        access_token=args.token,
+        collector_host=args.host,
+        collector_port=args.port,
+        collector_encryption=collector_encryption)
 
 
 if __name__ == '__main__':

examples/trivial/main.py

@@ -1,21 +1,22 @@
 """Simple example showing several generations of spans in a trace.
 """
 import argparse
-import contextlib
 import sys
 import time
 import traceback
 
 import opentracing
 import lightstep.tracer
 
+
 def sleep_dot():
     """Short sleep and writes a dot to the STDOUT.
     """
     time.sleep(0.05)
     sys.stdout.write('.')
     sys.stdout.flush()
 
+
 def add_spans():
     """Calls the opentracing API, doesn't use any LightStep-specific code.
     """
@@ -62,19 +63,28 @@ def lightstep_tracer_from_args():
                         default='collector.lightstep.com')
     parser.add_argument('--port', help='The LightStep reporting service port.',
                         type=int, default=443)
-    parser.add_argument('--use_tls', help='Whether to use TLS for reporting',
-                        type=bool, default=True)
+    parser.add_argument('--use_tls', help='Use TLS for reporting',
+                        dest="use_tls", action='store_true')
     parser.add_argument('--component_name', help='The LightStep component name',
                         default='TrivialExample')
+    parser.add_argument('--use_http', help='Use proto over http',
+                        dest="use_http", action='store_true')
     args = parser.parse_args()
 
+    if args.use_tls:
+        collector_encryption = 'tls'
+    else:
+        collector_encryption = 'none'
+
     return lightstep.Tracer(
             component_name=args.component_name,
             access_token=args.token,
             collector_host=args.host,
             collector_port=args.port,
             verbosity=1,
-            collector_encryption=('tls' if args.use_tls else 'none'))
+            collector_encryption=collector_encryption,
+            use_thrift=not args.use_http,
+            use_http=args.use_http)
 
 
 if __name__ == '__main__':

lightstep/converter.py

@@ -0,0 +1,52 @@
+from abc import ABCMeta, abstractmethod
+
+
+class Converter(object):
+    """Converter is a simple abstract interface for converting span data to wire compatible formats for the Satellites.
+    """
+
+    __metaclass__ = ABCMeta
+
+    @abstractmethod
+    def create_auth(self, access_token):
+        pass
+
+    @abstractmethod
+    def create_runtime(self, component_name, tags, guid):
+        pass
+
+    @abstractmethod
+    def create_span_record(self, span, guid):
+        pass
+
+    @abstractmethod
+    def append_attribute(self, span_record, key, value):
+        pass
+
+    @abstractmethod
+    def append_join_id(self, span_record, key, value):
+        pass
+
+    @abstractmethod
+    def append_log(self, span_record, log):
+        pass
+
+    @abstractmethod
+    def create_report(self, runtime, span_records):
+        pass
+
+    @abstractmethod
+    def combine_span_records(self, report_request, span_records):
+        pass
+
+    @abstractmethod
+    def num_span_records(self, report_request):
+        pass
+
+    @abstractmethod
+    def get_span_records(self, report_request):
+        pass
+
+    @abstractmethod
+    def get_span_name(self, span_record):
+        pass

lightstep/http_connection.py

@@ -0,0 +1,62 @@
+""" Connection class establishes HTTP connection with server.
+    Utilized to send Proto Report Requests.
+"""
+import threading
+import requests
+
+from lightstep.collector_pb2 import ReportResponse
+
+CONSECUTIVE_ERRORS_BEFORE_RECONNECT = 200
+
+
+class _HTTPConnection(object):
+    """Instances of _Connection are used to establish a connection to the
+    server via HTTP protocol.
+    """
+    def __init__(self, collector_url):
+        self._collector_url = collector_url
+        self._lock = threading.Lock()
+        self.ready = True
+        self._report_eof_count = 0
+        self._report_consecutive_errors = 0
+
+    def open(self):
+        """Establish HTTP connection to the server.
+        """
+        pass
+
+    # May throw an Exception on failure.
+    def report(self, *args, **kwargs):
+        """Report to the server."""
+        # Notice the annoying case change on the method name. I chose to stay
+        # consistent with casing in this class vs staying consistent with the
+        # casing of the pass-through method.
+        auth = args[0]
+        report = args[1]
+        with self._lock:
+            try:
+                report.auth.access_token = auth.access_token
+                headers = {"Content-Type": "application/octet-stream",
+                           "Accept": "application/octet-stream"}
+
+                r = requests.post(self._collector_url, headers=headers, data=report.SerializeToString())
+                resp = ReportResponse()
+                resp.ParseFromString(r.content)
+                self._report_consecutive_errors = 0
+                return resp
+            except EOFError:
+                self._report_consecutive_errors += 1
+                self._report_eof_count += 1
+                raise Exception('EOFError')
+            finally:
+                # In case the client has fallen into an unrecoverable state,
+                # recreate the data structure if there are continued report
+                # failures
+                if self._report_consecutive_errors == CONSECUTIVE_ERRORS_BEFORE_RECONNECT:
+                    self._report_consecutive_errors = 0
+                    self.ready = False
+
+    def close(self):
+        """Close HTTP connection to the server."""
+        self.ready = False
+        pass

lightstep/http_converter.py

@@ -0,0 +1,84 @@
+from lightstep.collector_pb2 import Auth, ReportRequest, Span, Reporter, KeyValue, Reference, SpanContext
+from lightstep.converter import Converter
+from . import util
+from . import version as tracer_version
+import sys
+from google.protobuf.timestamp_pb2 import Timestamp
+
+
+class HttpConverter(Converter):
+
+    def create_auth(self, access_token):
+        auth = Auth()
+        auth.access_token = access_token
+        return auth
+
+    def create_runtime(self, component_name, tags, guid):
+        if component_name is None:
+            component_name = sys.argv[0]
+
+        python_version = '.'.join(map(str, sys.version_info[0:3]))
+
+        if tags is None:
+            tags = {}
+        tracer_tags = tags.copy()
+
+        tracer_tags.update({
+            'lightstep.tracer_platform': 'python',
+            'lightstep.tracer_platform_version': python_version,
+            'lightstep.tracer_version': tracer_version.LIGHTSTEP_PYTHON_TRACER_VERSION,
+            'lightstep.component_name': component_name,
+            'lightstep.guid': util._id_to_hex(guid),
+        })
+
+        # Convert tracer_tags to a list of KeyValue pairs.
+        runtime_attrs = [KeyValue(key=k, string_value=util._coerce_str(v)) for (k, v) in tracer_tags.items()]
+
+        return Reporter(reporter_id=guid, tags=runtime_attrs)
+
+    def create_span_record(self, span, guid):
+        span_context = SpanContext(trace_id=span.context.trace_id,
+                                   span_id=span.context.span_id)
+        span_record = Span(span_context=span_context,
+                           operation_name=util._coerce_str(span.operation_name),
+                           start_timestamp=Timestamp(seconds=int(span.start_time)),
+                           duration_micros=int(util._time_to_micros(span.duration)))
+        if span.parent_id is not None:
+            reference = span_record.references.add()
+            reference.relationship=Reference.CHILD_OF
+            reference.span_context.span_id=span.parent_id
+
+        return span_record
+
+    def append_attribute(self, span_record, key, value):
+        kv = span_record.tags.add()
+        kv.key = key
+        kv.string_value = value
+
+    def append_join_id(self, span_record, key, value):
+        self.append_attribute(span_record, key, value)
+
+    def append_log(self, span_record, log):
+        if log.key_values is not None and len(log.key_values) > 0:
+            proto_log = span_record.logs.add()
+            proto_log.timestamp.seconds=int(log.timestamp)
+            for k, v in log.key_values.items():
+                field = proto_log.fields.add()
+                field.key = k
+                field.string_value = util._coerce_str(v)
+
+    def create_report(self, runtime, span_records):
+        return ReportRequest(reporter=runtime, spans=span_records)
+
+    def combine_span_records(self, report_request, span_records):
+        report_request.spans.extend(span_records)
+        return report_request.spans
+
+    def num_span_records(self, report_request):
+        return len(report_request.spans)
+
+    def get_span_records(self, report_request):
+        return report_request.spans
+
+    def get_span_name(self, span_record):
+        return span_record.operation_name