(conan-io#18685) splunk-opentelemetry-cpp: migrate to Conan v2

* splunk-opentelemetry-cpp: migrate to Conan v2

* splunk-opentelemetry-cpp: disable build_jaeger_exporter for now

* splunk-opentelemetry-cpp: re-enable build_jaeger_exporter

* splunk-opentelemetry-cpp: simplify test_package.cpp

* splunk-opentelemetry-cpp: downgrade opentelemetry-cpp dep

Fixes the test_package opentelemetry missing symbol linker error.

recipes/splunk-opentelemetry-cpp/all/conandata.yml

@@ -2,3 +2,8 @@ sources:
   0.4.0:
     url: "https://github.com/signalfx/splunk-otel-cpp/archive/refs/tags/v0.4.0.tar.gz"
     sha256: "e44f3167cecfea6d1fb0fa3060cc479a0873ab6d481b9b9f57629cbc7d17bfd4"
+patches:
+  "0.4.0":
+    - patch_file: "patches/0.4.0-001-fix-cmake.patch"
+      patch_description: "Make CMakeLists.txt compatible with Conan"
+      patch_type: "conan"

recipes/splunk-opentelemetry-cpp/all/conanfile.py

@@ -1,83 +1,115 @@
-from conans import ConanFile, CMake, tools
-from conans.errors import ConanInvalidConfiguration
 import os
-import glob
+
+from conan import ConanFile
+from conan.errors import ConanInvalidConfiguration
+from conan.tools.build import check_min_cppstd
+from conan.tools.cmake import CMake, CMakeDeps, CMakeToolchain, cmake_layout
+from conan.tools.files import copy, get, rmdir, export_conandata_patches, apply_conandata_patches
+from conan.tools.scm import Version
+
+required_conan_version = ">=1.53.0"
 
 
 class SplunkOpentelemetryConan(ConanFile):
     name = "splunk-opentelemetry-cpp"
+    description = "Splunk's distribution of OpenTelemetry C++"
     license = "Apache-2.0"
     url = "https://github.com/conan-io/conan-center-index"
     homepage = "https://github.com/signalfx/splunk-otel-cpp"
-    description = "Splunk's distribution of OpenTelemetry C++"
     topics = ("opentelemetry", "observability", "tracing")
-    settings = "os", "compiler", "build_type", "arch"
+
+    package_type = "library"
+    settings = "os", "arch", "compiler", "build_type"
     options = {
-        "fPIC": [True, False],
         "shared": [True, False],
+        "fPIC": [True, False],
+        "build_jaeger_exporter": [True, False],
     }
     default_options = {
-        "fPIC": True,
         "shared": False,
+        "fPIC": True,
+        "build_jaeger_exporter": True,
     }
-    generators = "cmake", "cmake_find_package_multi"
-    requires = "opentelemetry-cpp/1.0.1"
-    exports_sources = "CMakeLists.txt"
-    short_paths = True
-    _cmake = None
 
-    def validate(self):
-        if self.settings.arch != "x86_64":
-            raise ConanInvalidConfiguration("Architecture not supported")
+    @property
+    def _min_cppstd(self):
+        return 14
 
-    def configure(self):
-        if self.options.shared:
-            del self.options.fPIC
+    @property
+    def _compilers_minimum_version(self):
+        return {
+            "gcc": "6",
+            "clang": "5",
+            "apple-clang": "10",
+            "Visual Studio": "16",
+            "msvc": "192",
+        }
+
+    def export_sources(self):
+        export_conandata_patches(self)
 
     def config_options(self):
         if self.settings.os == "Windows":
             del self.options.fPIC
 
-    @property
-    def _source_subfolder(self):
-        return "source_subfolder"
+    def configure(self):
+        if self.options.shared:
+            self.options.rm_safe("fPIC")
 
-    @property
-    def _build_subfolder(self):
-        return "build_subfolder"
+    def layout(self):
+        cmake_layout(self, src_folder="src")
 
-    def _remove_unnecessary_package_files(self):
-        tools.rmdir(os.path.join(self.package_folder, "lib", "cmake"))
+    def requirements(self):
+        self.requires("opentelemetry-cpp/1.8.3", transitive_headers=True) # v1.12 is not compatible
+        self.requires("grpc/1.54.3")
+        self.requires("nlohmann_json/3.11.3")
+        if self.options.build_jaeger_exporter:
+            self.requires("thrift/0.17.0")
+            self.requires("libcurl/[>=7.78.0 <9]")
+
+    def validate(self):
+        if self.settings.arch != "x86_64":
+            raise ConanInvalidConfiguration(f"{self.settings.arch} architecture not supported")
+        if self.options.build_jaeger_exporter and not self.dependencies["opentelemetry-cpp"].options.get_safe("with_jaeger"):
+            raise ConanInvalidConfiguration("Cannot build Jaeger exporter without with_jaeger=True in opentelemetry-cpp")
+
+        if self.settings.compiler.cppstd:
+            check_min_cppstd(self, self._min_cppstd)
+        minimum_version = self._compilers_minimum_version.get(str(self.settings.compiler), False)
+        if minimum_version and Version(self.settings.compiler.version) < minimum_version:
+            raise ConanInvalidConfiguration(
+                f"{self.ref} requires C++{self._min_cppstd}, which your compiler does not support."
+            )
 
     def source(self):
-        tools.get(
-            **self.conan_data["sources"][self.version],
-            strip_root=True,
-            destination=self._source_subfolder
-        )
-
-    def _configure_cmake(self):
-        if self._cmake:
-            return self._cmake
-
-        self._cmake = CMake(self)
-        defs = {
-          "SPLUNK_CPP_EXAMPLES": False
-        }
-        self._cmake.configure(defs=defs, build_folder=self._build_subfolder)
-        return self._cmake
+        get(self, **self.conan_data["sources"][self.version], strip_root=True)
+
+    def generate(self):
+        tc = CMakeToolchain(self)
+        tc.variables["SPLUNK_CPP_TESTS"] = False
+        tc.variables["SPLUNK_CPP_EXAMPLES"] = False
+        tc.variables["SPLUNK_CPP_WITH_JAEGER_EXPORTER"] = self.options.build_jaeger_exporter
+        tc.generate()
+        tc = CMakeDeps(self)
+        tc.generate()
 
     def build(self):
-        cmake = self._configure_cmake()
+        apply_conandata_patches(self)
+        cmake = CMake(self)
+        cmake.configure()
         cmake.build()
 
     def package(self):
-        self.copy(pattern="LICENSE", dst="licenses", src=self._source_subfolder)
-        cmake = self._configure_cmake()
+        copy(self, "LICENSE", dst=os.path.join(self.package_folder, "licenses"), src=self.source_folder)
+        cmake = CMake(self)
         cmake.install()
-        self._remove_unnecessary_package_files()
+        rmdir(self, os.path.join(self.package_folder, "lib", "cmake"))
 
     def package_info(self):
+        self.cpp_info.set_property("cmake_file_name", "SplunkOpenTelemetry")
+        self.cpp_info.set_property("cmake_target_name", "SplunkOpenTelemetry::SplunkOpenTelemetry")
+        self.cpp_info.libs = ["SplunkOpenTelemetry"]
+
+        # TODO: to remove in conan v2 once cmake_find_package_* generators removed
         self.cpp_info.names["cmake_find_package"] = "SplunkOpenTelemetry"
         self.cpp_info.names["cmake_find_package_multi"] = "SplunkOpenTelemetry"
-        self.cpp_info.libs = ["SplunkOpenTelemetry"]

recipes/splunk-opentelemetry-cpp/all/patches/0.4.0-001-fix-cmake.patch

@@ -0,0 +1,26 @@
+--- CMakeLists.txt
++++ CMakeLists.txt
+@@ -1,4 +1,4 @@
+-cmake_minimum_required(VERSION 3.5.1)
++cmake_minimum_required(VERSION 3.15)
+
+ project(SplunkOpenTelemetry CXX)
+
+@@ -6,8 +6,6 @@
+ include(GenerateExportHeader)
+
+ set(PACKAGE_VERSION "0.1.0")
+-
+-set(CMAKE_CXX_STANDARD 11)
+
+ option(SPLUNK_CPP_TESTS "Enable building of tests" OFF)
+ option(SPLUNK_CPP_EXAMPLES "Enable building of examples" ON)
+@@ -36,7 +34,7 @@
+
+ target_link_libraries(SplunkOpenTelemetry
+   PUBLIC
+-  ${OPENTELEMETRY_CPP_LIBRARIES}
++  opentelemetry-cpp::opentelemetry-cpp
+   gRPC::grpc++
+   protobuf::libprotobuf
+   ${SPLUNK_CPP_JAEGER_EXPORTER_LIBS}

recipes/splunk-opentelemetry-cpp/all/test_package/CMakeLists.txt

@@ -1,13 +1,8 @@
-cmake_minimum_required(VERSION 3.12)
-
+cmake_minimum_required(VERSION 3.15)
 project(test_package CXX)
-set(CMAKE_CXX_STANDARD 11)
-
-include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
-conan_basic_setup(TARGETS)
 
 find_package(SplunkOpenTelemetry CONFIG REQUIRED)
 
 add_executable(test_package test_package.cpp)
-
 target_link_libraries(test_package SplunkOpenTelemetry::SplunkOpenTelemetry)
+target_compile_features(${PROJECT_NAME} PRIVATE cxx_std_14)

recipes/splunk-opentelemetry-cpp/all/test_package/conanfile.py

@@ -1,17 +1,26 @@
-from conans import ConanFile, CMake, tools
+from conan import ConanFile
+from conan.tools.build import can_run
+from conan.tools.cmake import cmake_layout, CMake
 import os
 
 
 class TestPackageConan(ConanFile):
-    settings = "os", "compiler", "build_type", "arch"
-    generators = "cmake", "cmake_find_package_multi"
+    settings = "os", "arch", "compiler", "build_type"
+    generators = "CMakeDeps", "CMakeToolchain", "VirtualRunEnv"
+    test_type = "explicit"
+
+    def requirements(self):
+        self.requires(self.tested_reference_str)
+
+    def layout(self):
+        cmake_layout(self)
 
     def build(self):
         cmake = CMake(self)
         cmake.configure()
         cmake.build()
 
     def test(self):
-        if not tools.cross_building(self):
-            bin_path = os.path.join("bin", "test_package")
-            self.run(bin_path, run_environment=True)
+        if can_run(self):
+            bin_path = os.path.join(self.cpp.build.bindir, "test_package")
+            self.run(bin_path, env="conanrun")

recipes/splunk-opentelemetry-cpp/all/test_package/test_package.cpp

@@ -1,22 +1,8 @@
-#include <opentelemetry/sdk/trace/tracer_provider.h>
 #include <splunk/opentelemetry.h>
 
-#include <stdio.h>
-
-int main(int argc, char** argv) {
+int main() {
   splunk::OpenTelemetryOptions otelOptions = splunk::OpenTelemetryOptions()
                                                .WithServiceName("my-service")
                                                .WithServiceVersion("1.0")
-                                               .WithExporter(splunk::ExporterType_JaegerThriftHttp)
                                                .WithDeploymentEnvironment("test");
-  auto provider = splunk::InitOpentelemetry(otelOptions);
-  auto span = opentelemetry::trace::Tracer::GetCurrentSpan();
-
-  char traceId[32] = {0};
-  char spanId[16] = {0};
-  span->GetContext().trace_id().ToLowerBase16(traceId);
-  span->GetContext().span_id().ToLowerBase16(spanId);
-  printf("current span: %.*s:%.*s\n", 32, traceId, 16, spanId);
-
-  return 0;
 }

recipes/splunk-opentelemetry-cpp/all/test_v1_package/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.15)
+project(test_package)
+
+include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
+conan_basic_setup(TARGETS)
+
+add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../test_package/
+                 ${CMAKE_CURRENT_BINARY_DIR}/test_package/)

recipes/splunk-opentelemetry-cpp/all/test_v1_package/conanfile.py

@@ -0,0 +1,17 @@
+from conans import ConanFile, CMake, tools
+import os
+
+
+class TestPackageConan(ConanFile):
+    settings = "os", "compiler", "build_type", "arch"
+    generators = "cmake", "cmake_find_package_multi"
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def test(self):
+        if not tools.cross_building(self):
+            bin_path = os.path.join("bin", "test_package")
+            self.run(bin_path, run_environment=True)