Add initial OpenCensus tracing support.

api/bazel/repositories.bzl

@@ -27,9 +27,8 @@ def api_dependencies():
         build_file_content = PROMETHEUSMETRICS_BUILD_CONTENT,
     )
     envoy_http_archive(
-        name = "io_opencensus_trace",
+        name = "opencensus_proto",
         locations = REPOSITORY_LOCATIONS,
-        build_file_content = OPENCENSUSTRACE_BUILD_CONTENT,
     )
     envoy_http_archive(
         name = "kafka_source",
@@ -38,8 +37,9 @@ def api_dependencies():
     )
 
 GOOGLEAPIS_BUILD_CONTENT = """
-load("@com_google_protobuf//:protobuf.bzl", "cc_proto_library", "py_proto_library")
+load("@com_google_protobuf//:protobuf.bzl", "py_proto_library")
 load("@io_bazel_rules_go//proto:def.bzl", "go_proto_library")
+load("@com_github_grpc_grpc//bazel:cc_grpc_library.bzl", "cc_grpc_library")
 
 filegroup(
     name = "api_httpbody_protos_src",
@@ -58,12 +58,7 @@ proto_library(
 
 cc_proto_library(
     name = "api_httpbody_protos",
-    srcs = [
-        "google/api/httpbody.proto",
-    ],
-    default_runtime = "@com_google_protobuf//:protobuf",
-    protoc = "@com_google_protobuf//:protoc",
-    deps = ["@com_google_protobuf//:cc_wkt_protos"],
+    deps = [":api_httpbody_protos_proto"],
     visibility = ["//visibility:public"],
 )
 
@@ -114,14 +109,7 @@ proto_library(
 
 cc_proto_library(
     name = "http_api_protos",
-    srcs = [
-        "google/api/annotations.proto",
-        "google/api/http.proto",
-    ],
-    default_runtime = "@com_google_protobuf//:protobuf",
-    protoc = "@com_google_protobuf//:protoc",
-    linkstatic = 1,
-    deps = ["@com_google_protobuf//:cc_wkt_protos"],
+    deps = [":http_api_protos_proto"],
     visibility = ["//visibility:public"],
 )
 
@@ -164,14 +152,9 @@ proto_library(
 )
 
 cc_proto_library(
-     name = "rpc_status_protos",
-     srcs = ["google/rpc/status.proto"],
-     default_runtime = "@com_google_protobuf//:protobuf",
-     protoc = "@com_google_protobuf//:protoc",
-     deps = [
-         "@com_google_protobuf//:cc_wkt_protos"
-     ],
-     visibility = ["//visibility:public"],
+    name = "rpc_status_protos",
+    deps = [":rpc_status_protos_lib"],
+    visibility = ["//visibility:public"],
 )
 
 go_proto_library(
@@ -195,6 +178,35 @@ py_proto_library(
      visibility = ["//visibility:public"],
      deps = ["@com_google_protobuf//:protobuf_python"],
 )
+
+proto_library(
+    name = "tracing_proto_proto",
+    srcs = [
+        "google/devtools/cloudtrace/v2/trace.proto",
+        "google/devtools/cloudtrace/v2/tracing.proto",
+    ],
+    deps = [
+        ":http_api_protos_proto",
+        ":rpc_status_protos_lib",
+        "@com_google_protobuf//:timestamp_proto",
+        "@com_google_protobuf//:wrappers_proto",
+        "@com_google_protobuf//:empty_proto",
+    ],
+)
+
+cc_proto_library(
+    name = "tracing_proto_cc",
+    deps = [":tracing_proto_proto"],
+)
+
+cc_grpc_library(
+    name = "tracing_proto",
+    srcs = [":tracing_proto_proto"],
+    deps = [":tracing_proto_cc"],
+    grpc_only = True,
+    visibility = ["@io_opencensus_cpp//opencensus:__subpackages__"],
+)
+
 """
 
 GOGOPROTO_BUILD_CONTENT = """

api/bazel/repository_locations.bzl

@@ -4,8 +4,8 @@ BAZEL_SKYLIB_SHA256 = "2ef429f5d7ce7111263289644d233707dba35e39696377ebab8b0bc70
 GOGOPROTO_RELEASE = "1.2.1"
 GOGOPROTO_SHA256 = "99e423905ba8921e86817607a5294ffeedb66fdd4a85efce5eb2848f715fdb3a"
 
-OPENCENSUS_RELEASE = "0.1.0"
-OPENCENSUS_SHA256 = "4fd21cc6de63d7cb979fd749d8101ff425905aa0826fed26019d1c311fcf19a7"
+OPENCENSUS_PROTO_GIT_SHA = "d5d80953a8c2ff4633087af6933cd152678434bb"  # Mar 18, 2019
+OPENCENSUS_PROTO_SHA256 = "a4e87a1da21d1b3a16674332c3ee6e2689d52f3532e2ff8cb4a626c8bcdabcfc"
 
 PGV_GIT_SHA = "26db5cb7c01a67c6a2e21a832106406185530b2f"
 PGV_SHA256 = "6510cbcf69d99059c652ae2376f6240bc761d0b019cd962225f4f609be361e26"
@@ -44,10 +44,10 @@ REPOSITORY_LOCATIONS = dict(
         strip_prefix = "client_model-" + PROMETHEUS_GIT_SHA,
         urls = ["https://github.com/prometheus/client_model/archive/" + PROMETHEUS_GIT_SHA + ".tar.gz"],
     ),
-    io_opencensus_trace = dict(
-        sha256 = OPENCENSUS_SHA256,
-        strip_prefix = "opencensus-proto-" + OPENCENSUS_RELEASE + "/src/opencensus/proto/trace/v1",
-        urls = ["https://github.com/census-instrumentation/opencensus-proto/archive/v" + OPENCENSUS_RELEASE + ".tar.gz"],
+    opencensus_proto = dict(
+        sha256 = OPENCENSUS_PROTO_SHA256,
+        strip_prefix = "opencensus-proto-" + OPENCENSUS_PROTO_GIT_SHA + "/src",
+        urls = ["https://github.com/census-instrumentation/opencensus-proto/archive/" + OPENCENSUS_PROTO_GIT_SHA + ".tar.gz"],
     ),
     kafka_source = dict(
         sha256 = KAFKA_SOURCE_SHA,

api/envoy/config/trace/v2/BUILD

@@ -10,6 +10,7 @@ api_proto_library_internal(
     ],
     deps = [
         "//envoy/api/v2/core:grpc_service",
+        "@opencensus_proto//opencensus/proto/trace/v1:trace_config_proto",
     ],
 )
 
@@ -18,5 +19,6 @@ api_go_proto_library(
     proto = ":trace",
     deps = [
         "//envoy/api/v2/core:grpc_service_go_proto",
+        "@opencensus_proto//opencensus/proto/trace/v1:trace_and_config_proto_go",
     ],
 )

api/envoy/config/trace/v2/trace.proto

@@ -11,6 +11,7 @@ option java_package = "io.envoyproxy.envoy.config.trace.v2";
 option go_package = "v2";
 
 import "envoy/api/v2/core/grpc_service.proto";
+import "opencensus/proto/trace/v1/trace_config.proto";
 
 import "google/protobuf/any.proto";
 import "google/protobuf/struct.proto";
@@ -33,6 +34,7 @@ message Tracing {
     // - *envoy.zipkin*
     // - *envoy.dynamic.ot*
     // - *envoy.tracers.datadog*
+    // - *envoy.tracers.opencensus*
     string name = 1 [(validate.rules).string.min_bytes = 1];
 
     // Trace driver specific configuration which depends on the driver being instantiated.
@@ -42,6 +44,7 @@ message Tracing {
     // - :ref:`ZipkinConfig <envoy_api_msg_config.trace.v2.ZipkinConfig>`
     // - :ref:`DynamicOtConfig <envoy_api_msg_config.trace.v2.DynamicOtConfig>`
     // - :ref:`DatadogConfig <envoy_api_msg_config.trace.v2.DatadogConfig>`
+    // - :ref:`OpenCensusConfig <envoy_api_msg_config.trace.v2.OpenCensusConfig>`
     oneof config_type {
       google.protobuf.Struct config = 2;
 
@@ -103,6 +106,52 @@ message DatadogConfig {
   string service_name = 2 [(validate.rules).string.min_bytes = 1];
 }
 
+// Configuration for the OpenCensus tracer.
+// [#proto-status: experimental]
+message OpenCensusConfig {
+  // Configures tracing, e.g. the sampler, max number of annotations, etc.
+  opencensus.proto.trace.v1.TraceConfig trace_config = 1;
+
+  // Enables the stdout exporter if set to true. This is intended for debugging
+  // purposes.
+  bool stdout_exporter_enabled = 2;
+
+  // Enables the Stackdriver exporter if set to true. The project_id must also
+  // be set.
+  bool stackdriver_exporter_enabled = 3;
+
+  // The Cloud project_id to use for Stackdriver tracing.
+  string stackdriver_project_id = 4;
+
+  // Enables the Zipkin exporter if set to true. The url and service name must
+  // also be set.
+  bool zipkin_exporter_enabled = 5;
+
+  // The URL to Zipkin, e.g. "http://127.0.0.1:9411/api/v2/spans"
+  string zipkin_url = 6;
+
+  // The Zipkin service name.
+  string zipkin_service_name = 7;
+
+  enum TraceContext {
+    // W3C Trace-Context format "traceparent:" header.
+    trace_context = 0;
+
+    // Binary "grpc-trace-bin:" header.
+    grpc_trace_bin = 1;
+
+    // "X-Cloud-Trace-Context:" header.
+    cloud_trace_context = 2;
+  }
+
+  // List of incoming trace context headers we will accept. First one found
+  // wins.
+  repeated TraceContext incoming_trace_context = 8;
+
+  // List of outgoing trace context headers we will produce.
+  repeated TraceContext outgoing_trace_context = 9;
+}
+
 // Configuration structure.
 message TraceServiceConfig {
   // The upstream gRPC cluster that hosts the metrics service.

api/envoy/service/trace/v2/BUILD

@@ -9,7 +9,7 @@ api_proto_library_internal(
     require_py = 0,
     deps = [
         "//envoy/api/v2/core:base",
-        "@io_opencensus_trace//:trace_model",
+        "@opencensus_proto//opencensus/proto/trace/v1:trace_proto",
     ],
 )
 
@@ -18,6 +18,6 @@ api_go_grpc_library(
     proto = ":trace_service",
     deps = [
         "//envoy/api/v2/core:base_go_proto",
-        "@io_opencensus_trace//:trace_model_go_proto",
+        "@opencensus_proto//opencensus/proto/trace/v1:trace_proto_go",
     ],
 )

api/envoy/service/trace/v2/trace_service.proto

@@ -11,7 +11,7 @@ option go_package = "v2";
 option java_generic_services = true;
 
 import "envoy/api/v2/core/base.proto";
-import "trace.proto";
+import "opencensus/proto/trace/v1/trace.proto";
 
 import "google/api/annotations.proto";
 

bazel/external/rapidjson.BUILD

@@ -3,6 +3,7 @@ licenses(["notice"])  # Apache 2
 cc_library(
     name = "rapidjson",
     hdrs = glob(["include/rapidjson/**/*.h"]),
+    defines = ["RAPIDJSON_HAS_STDSTRING=1"],
     includes = ["include"],
     visibility = ["//visibility:public"],
 )

bazel/foreign_cc/BUILD

@@ -66,6 +66,26 @@ envoy_cmake_external(
     }),
 )
 
+envoy_cmake_external(
+    name = "curl",
+    cache_entries = {
+        "BUILD_CURL_EXE": "off",
+        "BUILD_SHARED_LIBS": "off",
+        "CMAKE_BUILD_TYPE": "RelWithDebInfo",
+        "HTTP_ONLY": "on",
+        "BUILD_TESTING": "off",
+        "CMAKE_USE_OPENSSL": "off",
+        "CURL_CA_PATH": "none",
+        "CURL_HIDDEN_SYMBOLS": "off",
+        "CMAKE_USE_LIBSSH2": "off",
+    },
+    lib_source = "@com_github_curl//:all",
+    static_libraries = select({
+        "//bazel:windows_x86_64": ["curl.lib"],
+        "//conditions:default": ["libcurl.a"],
+    }),
+)
+
 envoy_cmake_external(
     name = "event",
     cache_entries = {

bazel/foreign_cc/com_lightstep_tracer_cpp.patch

@@ -0,0 +1,11 @@
+--- lightstep-tracer-common/BUILD	2019-05-29 13:04:55.651083767 -0700
++++ lightstep-tracer-common/BUILD	2019-05-29 13:04:59.711080560 -0700
+@@ -2,7 +2,7 @@
+     name = "collector_proto",
+     srcs = ["collector.proto"],
+     deps = [
+-        "@lightstep_vendored_googleapis//:googleapis_proto",
++        "@googleapis//:http_api_protos_proto",
+         "@com_google_protobuf//:timestamp_proto",
+     ],
+     visibility = ["//visibility:public"],

bazel/foreign_cc/io_opencensus_cpp.patch

@@ -0,0 +1,52 @@
+--- copts.bzl	2019-06-03 16:42:49.752903373 -0700
++++ opencensus/copts.bzl	2019-06-03 16:43:58.136847278 -0700
+@@ -22,25 +22,25 @@
+ """
+
+ load(
+-    "@com_google_absl//absl:copts/GENERATED_copts.bzl",
+-    "ABSL_GCC_FLAGS",
+-    "ABSL_GCC_TEST_FLAGS",
+-    "ABSL_LLVM_FLAGS",
+-    "ABSL_LLVM_TEST_FLAGS",
+-    "ABSL_MSVC_FLAGS",
+-    "ABSL_MSVC_TEST_FLAGS",
++    "@com_google_absl//absl:copts.bzl",
++    "GCC_FLAGS",
++    "GCC_TEST_FLAGS",
++    "LLVM_FLAGS",
++    "LLVM_TEST_FLAGS",
++    "MSVC_FLAGS",
++    "MSVC_TEST_FLAGS",
+ )
+
+ WERROR = ["-Werror=return-type", "-Werror=switch"]
+
+ DEFAULT_COPTS = select({
+-    "//opencensus:llvm_compiler": ABSL_LLVM_FLAGS + WERROR,
+-    "//opencensus:windows": ABSL_MSVC_FLAGS,
+-    "//conditions:default": ABSL_GCC_FLAGS + WERROR,
++    "//opencensus:llvm_compiler": LLVM_FLAGS + WERROR,
++    "//opencensus:windows": MSVC_FLAGS,
++    "//conditions:default": GCC_FLAGS + WERROR,
+ })
+
+ TEST_COPTS = DEFAULT_COPTS + select({
+-    "//opencensus:llvm_compiler": ABSL_LLVM_TEST_FLAGS + WERROR,
+-    "//opencensus:windows": ABSL_MSVC_TEST_FLAGS,
+-    "//conditions:default": ABSL_GCC_TEST_FLAGS + WERROR,
++    "//opencensus:llvm_compiler": LLVM_TEST_FLAGS + WERROR,
++    "//opencensus:windows": MSVC_TEST_FLAGS,
++    "//conditions:default": GCC_TEST_FLAGS + WERROR,
+ })
+--- BUILD	2019-06-03 18:30:58.511651926 -0700
++++ opencensus/exporters/trace/stackdriver/BUILD	2019-06-03 18:32:38.107571186 -0700
+@@ -28,7 +28,7 @@
+     copts = DEFAULT_COPTS,
+     visibility = ["//visibility:public"],
+     deps = [
+-        "//google/devtools/cloudtrace/v2:tracing_proto",
++        "@googleapis//:tracing_proto",
+         "//opencensus/common:version",
+         "//opencensus/common/internal/grpc:status",
+         "//opencensus/common/internal/grpc:with_user_agent",