Merge branch 'main' into public-version-hpp

BUILDING.md

@@ -148,6 +148,124 @@ an installation tree under `build/install`.
 
 If the build did not succeed, please see the next section.
 
+## Building with `conan`
+
+As of version 0.0.11 there is experimental support for building with
+the `conan` C++ package manager. This section will go into more detail
+without assuming any familiarity with `conan`, but please consult the
+[`conan` docs](https://docs.conan.io/2/introduction.html) for more info.
+
+To use `conan`, you'll need to have `python` and `pip` on your system if
+you don't already. For example,
+
+- Debian: `apt-get install python3 python3-pip`
+- MacOS with Homebrew: `brew install python`
+
+and then, optionally in a venv if you prefer,
+
+```shell
+pip install conan
+conan profile detect
+```
+
+The second line detects a default [`conan`
+profile](https://docs.conan.io/2/reference/config_files/profiles.html)
+encapsulating your build environment, which you can modify as needed.
+
+Next note that there are two possible approaches here, which complement
+or supersede some of the other sections in this document. Namely, it is
+possible to
+
+1. use `conan` to build and package the SDK; OR
+2. use `conan` to obtain the [software
+   prerequisites](#software-prerequisites) for the SDK.
+
+Option 1. makes more sense for [building against the
+SDK](#building-against-the-sdk) as you would in module development.
+There we use `conan` to get the SDK's dependencies, and then to  build,
+install, and package the SDK, which can then be consumed by declaring it
+as a `conan` dependency.
+
+Option 2. makes more sense for doing locally development *on* the SDK
+while using `conan` to get dependencies instead of your system package
+manager. Note that Option 1 implies a superset of Option 2.
+
+In either case, `conan` will use the [`conanfile.py`](/conanfile.py).
+Note that we build with `offline_proto_generation=True` by default.
+
+### Option 1. Creating and consuming the SDK `conan` package.
+
+Here we use `conan` to package and install the SDK so that we can build
+against it by declaring it as a dependency in a
+`conanfile.txt` or a `conanfile.py`.
+
+To do this, call `conan create .` from the project root. This will build
+and test the `viam-cpp-sdk` recipe, adding it into your local cache. See
+the [conan docs](https://docs.conan.io/2/reference/commands/create.html)
+for more info on `conan create`, as we will omit any details about using
+profiles, options, or settings to customize the build.
+
+Once this is done, the `viam-cpp-sdk` package is ready to be consumed.
+The example projects show a [minimal
+`conanfile.txt`](src/viam/examples/project/cmake/conanfile.txt). With
+this `conanfile.txt` in the same directory as your project's
+`CMakeLists.txt`, you can then do, for example,
+
+```shell
+conan install . --output-folder=build-conan --build=missing
+cmake . --preset=conan-release
+cmake --build --preset=conan-release -j 8
+```
+
+Note that this can be done with the same `CMakeLists.txt` from the
+[example project](src/viam/examples/project/cmake/CMakeLists.txt): it is
+agnostic of the use of `conan` to package the SDK as opposed to the SDK
+having been built and installed manually.
+
+It is also possible to build using a `conanfile.py` rather than a
+`conanfile.txt`, see again the [conan
+docs](https://docs.conan.io/2/tutorial/consuming_packages/the_flexibility_of_conanfile_py.html#consuming-packages-flexibility-of-conanfile-py),
+or look at the [`test_package/conanfile.py`](test_package/conanfile.py)
+which is the test package recipe.
+
+### Option 2. Using `conan` to manage the SDK dependencies
+
+Here we use `conan` to grab the SDK dependencies, setting ourselves up
+for local SDK development.
+
+From the root of this repo, you can do
+``` shell
+conan install . --output-folder=build-conan --build=missing
+```
+to install dependencies with `conan`. And then
+``` shell
+cmake . --preset conan-release
+cmake --build --preset=conan-release -j
+```
+The `conan install` sets up some
+[cmake-presets](https://cmake.org/cmake/help/latest/manual/cmake-presets.7.html)
+which are used to resolve `--preset conan-release` above. Among other
+things, this tells CMake about the `conan_toolchain.cmake` generated by
+`conan`, and runs CMake with certain environment variables set.
+
+If you do not want to use cmake-presets, you can do
+``` shell
+cd build-conan
+source conanbuild.sh
+cmake .. -G Ninja -DCMAKE_TOOLCHAIN_FILE=conan_toolchain.cmake
+```
+and later call `source deactivate_conanbuild.sh`. The `conanbuild.sh`
+script does the same environment variable setting as the cmake-presets,
+but it may be preferable if you would rather invoke your build system
+directly.
+
+PLEASE NOTE: Whether by cmake-presets or `conanbuild.sh`, you MUST, one
+way or another, make the `PATH` entries set by `conan` available to
+CMake, because `buf` requires that `protoc` is available on `PATH`. If
+you do not do this then `buf generate` will fail outright, or, if you
+have a different version of `protoc` available in your `PATH`, it will
+silently fail and later cause compilation failures due to protobuf
+version mismatches.
 
 ## Options to Configure or Customize the Build
 
@@ -250,9 +368,8 @@ The Viam C++ SDK installs support files for CMake's `find_package`
 subsystem.
 
 ``` cmake
-find_package(viam-cpp-sdk CONFIG REQUIRED COMPONENTS Lib)
-target_link_libraries(mytarget viam-cpp-sdk::viamcpp)
-
+find_package(viam-cpp-sdk CONFIG REQUIRED COMPONENTS viamsdk)
+target_link_libraries(mytarget viam-cpp-sdk::viamsdk)
 ```
 
 Note that you will need to ensure that `CMAKE_PREFIX_PATH` is set

CMakeLists.txt

@@ -127,6 +127,18 @@ option(VIAMCPPSDK_SANITIZED_BUILD "Build with address and UB sanitizers (less pe
 #
 option(VIAMCPPSDK_CLANG_TIDY "Run the clang-tidy linter" OFF)
 
+# The following options are only defined if this project is not being included as a subproject
+if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+  include(CMakeDependentOption)
+  option(VIAMCPPSDK_BUILD_EXAMPLES "Build the example executables (requires building tests too)" ON)
+
+  # Note that the complex module example requires the testing library and adds its tests to the unit
+  # test suite. Thus you can only disable tests if examples are also disabled.
+  # The call below says don't give the user the option to disable tests unless examples are already
+  # disabled, and default to building the tests in either case.
+  cmake_dependent_option(VIAMCPPSDK_BUILD_TESTS "Build the unit test suite" ON "NOT VIAMCPPSDK_BUILD_EXAMPLES" ON)
+endif()
+
 
 # Enforce known toolchains and toolchain minima unless asked not to.
 if (VIAMCPPSDK_ENFORCE_COMPILER_MINIMA)
@@ -186,6 +198,11 @@ set(CMAKE_MODULE_PATH
   ${CMAKE_MODULE_PATH}
   ${PROJECT_SOURCE_DIR}/src/viam/cmake
 )
+if (VIAMCPPSDK_BUILD_TESTS OR VIAMCPPSDK_BUILD_EXAMPLES)
+  # We maybe could include this unconditionally, but technically only tests or examples need it
+  include(viamcppsdk_utils)
+endif()
+
 
 
 # Configure how the SDK will manage runtime paths. This is important
@@ -336,11 +353,14 @@ find_package(Boost ${VIAMCPPSDK_BOOST_VERSION_MINIMUM} REQUIRED COMPONENTS heade
 # another try via pkgconfig.
 
 find_package(gRPC ${VIAMCPPSDK_GRPC_VERSION_MINIMUM} CONFIG)
-if (gRPC_FOUND)
+
+# Protobuf has an idiosyncratic system for checking version compatibility, so we specify
+# no version here and check it manually below.
+find_package(Protobuf CONFIG)
+
+if (gRPC_FOUND AND Protobuf_FOUND)
   get_target_property(VIAMCPPSDK_GRPC_CPP_PLUGIN gRPC::grpc_cpp_plugin LOCATION)
   set(VIAMCPPSDK_PROTOBUF_VERSION ${Protobuf_VERSION})
-  set(VIAMCPPSDK_PROTOBUF_VERSION_MAJOR ${Protobuf_VERSION_MAJOR})
-  set(VIAMCPPSDK_PROTOBUF_VERSION_MINOR ${Protobuf_VERSION_MINOR})
 
   # We need a good value for VIAMCPPSDK_PROTOBUF_VERSION in order to
   # interpolate it into our `pkgconfig` requirements. Make sure we
@@ -358,7 +378,7 @@ if (gRPC_FOUND)
   set(VIAMCPPSDK_GRPCXX_VERSION ${gRPC_VERSION})
   set(VIAMCPPSDK_GRPCXX_LIBRARIES gRPC::grpc++)
   set(VIAMCPPSDK_GRPCXX_REFLECTION_LIBRARIES gRPC::grpc++_reflection)
-else()
+elseif((NOT gRPC_FOUND) AND (NOT Protobuf_FOUND))
   message(WARNING "Failed to find gRPC with `find_package`; falling back to `pkg_check_modules`")
 
   include(FindPkgConfig)
@@ -368,8 +388,6 @@ else()
   pkg_check_modules(GRPCXX REQUIRED grpc++>=${VIAMCPPSDK_GRPC_VERSION_MINIMUM})
 
   set(VIAMCPPSDK_PROTOBUF_VERSION ${PROTOBUF_VERSION})
-  string(REGEX REPLACE "^([0-9]+)\.([0-9]+)\.([0-9]+)$" "\\1" VIAMCPPSDK_PROTOBUF_VERSION_MAJOR ${VIAMCPPSDK_PROTOBUF_VERSION})
-  string(REGEX REPLACE "^([0-9]+)\.([0-9]+)\.([0-9]+)$" "\\2" VIAMCPPSDK_PROTOBUF_VERSION_MINOR ${VIAMCPPSDK_PROTOBUF_VERSION})
   set(VIAMCPPSDK_PROTOBUF_INCLUDE_DIRS ${PROTOBUF_INCLUDE_DIRS})
   set(VIAMCPPSDK_PROTOBUF_LIBRARY_DIRS ${PROTOBUF_LIBRARY_DIRS})
   set(VIAMCPPSDK_PROTOBUF_LIBRARIES ${PROTOBUF_LIBRARIES})
@@ -396,10 +414,25 @@ else()
   set(VIAMCPPSDK_GRPCXX_REFLECTION_LIBRARIES ${VIAMCPPSDK_GRPCXX_LIBRARIES})
   set(VIAMCPPSDK_GRPCXX_REFLECTION_LIB ${VIAMCPPSDK_GRPCXX_ROOT}_reflection)
   list(PREPEND VIAMCPPSDK_GRPCXX_REFLECTION_LIBRARIES ${VIAMCPPSDK_GRPCXX_REFLECTION_LIB})
+else()
+  message(FATAL_ERROR "Unexpected combination of find_package and pkg-config protobuf and gRPC")
+endif()
+
+# Do this here unconditionally in case find_package didn't set the MAJOR/MINOR variables
+string(REGEX REPLACE "^([0-9]+)\.([0-9]+)\.([0-9]+)$" "\\1" VIAMCPPSDK_PROTOBUF_VERSION_MAJOR ${VIAMCPPSDK_PROTOBUF_VERSION})
+string(REGEX REPLACE "^([0-9]+)\.([0-9]+)\.([0-9]+)$" "\\2" VIAMCPPSDK_PROTOBUF_VERSION_MINOR ${VIAMCPPSDK_PROTOBUF_VERSION})
+string(REGEX REPLACE "^([0-9]+)\.([0-9]+)\.([0-9]+)$" "\\3" VIAMCPPSDK_PROTOBUF_VERSION_PATCH ${VIAMCPPSDK_PROTOBUF_VERSION})
+
+# The check below expects a version that looks like 20-something.x.y, so if
+# we got a major version that doesn't look like that, synthesize one from the version we did get.
+if (VIAMCPPSDK_PROTOBUF_VERSION_MAJOR GREATER 20)
+  set(VIAMCPPSDK_PROTOC_VERSION "${VIAMCPPSDK_PROTOBUF_VERSION_MAJOR}.${VIAMCPPSDK_PROTOBUF_VERSION_MINOR}")
+else()
+  set(VIAMCPPSDK_PROTOC_VERSION "${VIAMCPPSDK_PROTOBUF_VERSION_MINOR}.${VIAMCPPSDK_PROTOBUF_VERSION_PATCH}")
 endif()
 
 # These are the minimum versions of gRPC and protobuf for which remote plugins with buf are supported.
-if ((VIAMCPPSDK_GRPCXX_VERSION VERSION_GREATER 1.51.1) AND (VIAMCPPSDK_PROTOBUF_VERSION VERSION_GREATER 21.7.0))
+if ((VIAMCPPSDK_GRPCXX_VERSION VERSION_GREATER 1.51.1) AND (VIAMCPPSDK_PROTOC_VERSION VERSION_GREATER 21.7.0))
   set(VIAMCPPSDK_BUF_REMOTE_PLUGIN_SUPPORTED 1)
 endif()
 
@@ -441,8 +474,10 @@ add_custom_target(
   DEPENDS all
 )
 
-add_custom_target(
-  install-examples
-  COMMAND ${CMAKE_COMMAND} -DCOMPONENT=viam-cpp-sdk_examples -P ${CMAKE_BINARY_DIR}/cmake_install.cmake
-  DEPENDS all
-)
+if (VIAMCPPSDK_BUILD_EXAMPLES)
+  add_custom_target(
+    install-examples
+    COMMAND ${CMAKE_COMMAND} -DCOMPONENT=viam-cpp-sdk_examples -P ${CMAKE_BINARY_DIR}/cmake_install.cmake
+    DEPENDS all
+  )
+endif()

conanfile.py

@@ -0,0 +1,109 @@
+from conan import ConanFile
+from conan.tools.cmake import CMake, CMakeDeps, CMakeToolchain, cmake_layout
+from conan.tools.files import load
+import re
+
+class ViamCppSdkRecipe(ConanFile):
+    name = "viam-cpp-sdk"
+
+    license = "Apache-2.0"
+    url = "https://github.com/viamrobotics/viam-cpp-sdk/"
+
+    package_type = "library"
+
+    settings = "os", "compiler", "build_type", "arch"
+
+    options = {
+        "offline_proto_generation": [True, False],
+        "shared": [True, False]
+    }
+
+    default_options = {
+        "offline_proto_generation": True,
+        "shared": True
+    }
+
+    exports_sources = "CMakeLists.txt", "LICENSE", "src/*"
+
+    def set_version(self):
+        content = load(self, "CMakeLists.txt")
+        self.version = re.search("set\(CMAKE_PROJECT_VERSION (.+)\)", content).group(1).strip()
+
+    def configure(self):
+        # If we're building static then build the world as static, otherwise
+        # stuff will probably break.
+        # If you want your shared build to also build the world as shared, you
+        # can invoke conan with -o "&:shared=False" -o "*:shared=False",
+        # possibly with --build=missing or --build=cascade as desired,
+        # but this is probably not necessary.
+        if not self.options.shared:
+            self.options["*"].shared = False
+
+    def requirements(self):
+        self.requires('boost/[>=1.74.0]', transitive_headers=True)
+
+        # The SDK supports older grpc and protobuf, but these are the oldest
+        # maintained conan packages.
+        self.requires('grpc/[>=1.48.4]', transitive_headers=True)
+        self.requires('protobuf/[>=3.17.1]', transitive_headers=True)
+
+        self.requires('xtensor/[>=0.24.3]', transitive_headers=True)
+        self.requires('abseil/[>=20230125.3]')
+
+    def build_requirements(self):
+        if self.options.offline_proto_generation:
+            self.tool_requires('grpc/[>=1.48.4]')
+            self.tool_requires('protobuf/[>=3.17.1]')
+
+    def layout(self):
+        cmake_layout(self)
+
+    def generate(self):
+        tc = CMakeToolchain(self)
+
+        tc.cache_variables["VIAMCPPSDK_OFFLINE_PROTO_GENERATION"] = self.options.offline_proto_generation
+        tc.cache_variables["VIAMCPPSDK_USE_DYNAMIC_PROTOS"] = True
+
+        tc.cache_variables["VIAMCPPSDK_BUILD_TESTS"] = False
+        tc.cache_variables["VIAMCPPSDK_BUILD_EXAMPLES"] = False
+
+        tc.generate()
+
+        CMakeDeps(self).generate()
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def package(self):
+        CMake(self).install()
+
+    def package_info(self):
+        self.cpp_info.components["viam_rust_utils"].libs = ["viam_rust_utils"]
+
+        for component in ["viamsdk", "viamapi"]:
+           self.cpp_info.components[component].libs = [component]
+           self.cpp_info.components[component].set_property("cmake_target_name", "viam-cpp-sdk::{}".format(component))
+           self.cpp_info.components[component].set_property("pkg_config_name", "viam-cpp-sdk-lib{}".format(component))
+           self.cpp_info.components[component].requires = ["grpc::grpc++", "protobuf::libprotobuf"]
+           if self.settings.os in ["Linux", "FreeBSD"]:
+            self.cpp_info.components[component].system_libs = ["pthread"]
+
+        if self.settings.os in ["Linux", "FreeBSD"]:
+            self.cpp_info.components["viamsdk"].system_libs.extend(["dl", "rt"])
+
+        self.cpp_info.components["viamapi"].includedirs.append("include/viam/api")
+
+        self.cpp_info.components["viamsdk"].requires.extend([
+            "viamapi",
+            "boost::headers",
+            "boost::log",
+            "xtensor::xtensor",
+
+            "viam_rust_utils",
+            "abseil::absl_strings",
+            "grpc::grpc++_reflection"
+        ])
+
+        self.cpp_info.components["viamsdk"].frameworks = ["Security"]

src/viam/CMakeLists.txt

@@ -14,7 +14,10 @@
 
 add_subdirectory(api)
 add_subdirectory(sdk)
-add_subdirectory(examples)
+
+if (VIAMCPPSDK_BUILD_EXAMPLES)
+  add_subdirectory(examples)
+endif()
 
 # Generate CMake configs to enable importing this project
 # into others via `find_package`.

src/viam/api/config/buf.gen.remote.plugin.yaml.in

@@ -18,5 +18,5 @@ managed:
 plugins:
   - plugin: buf.build/grpc/cpp:v@VIAMCPPSDK_GRPCXX_VERSION@
     out: gen/viam/api
-  - plugin: buf.build/protocolbuffers/cpp:v@VIAMCPPSDK_PROTOBUF_VERSION_MAJOR@.@VIAMCPPSDK_PROTOBUF_VERSION_MINOR@
+  - plugin: buf.build/protocolbuffers/cpp:v@VIAMCPPSDK_PROTOC_VERSION@
     out: gen/viam/api

src/viam/examples/project/README.md

@@ -4,8 +4,12 @@ tree and read the build instructions, then install the SDK.
 
 - For an example project showing how to consume an installed
   `viam-cpp-sdk` with CMake's `find_package`, see
-  `cmake/CMakeLists.txt`.
+  [`cmake/CMakeLists.txt`](cmake/CMakeLists.txt). Note that
+  this sample `CMakeLists.txt` can be used with no modifications
+  to build against the SDK as installed directly from CMake,
+  or to build against the `viam-cpp-sdk` `conan` package. For
+  instructions building with `conan`, see [here](/BUILDING.md#creating-and-consuming-the-sdk-conan-package).
 
 - For an example project showing how to consume an installed
   `viam-cpp-sdk` via its `pkg-config` setup, see
-  `pkg-config/Makefile`.
+  [`pkg-config/Makefile`](pkg-config/Makefile).

src/viam/examples/project/cmake/conanfile.txt

@@ -0,0 +1,6 @@
+[requires]
+viam-cpp-sdk/[>=0.0.11]
+
+[generators]
+CMakeDeps
+CMakeToolchain