Question: How to import otlp_http_exporter in a bazel project?

[miiila]

Hey everybody, I have a question about importing otlp_http_exporter in a bazel project. I tried adding following into my WORKSPACE file:

# https://github.com/open-telemetry/opentelemetry-cpp
new_git_repo
    name = "opentelemetry-cpp",
    commit = "096c08b6b6dbd8645eebdccc8c06b83fa7a50cd3",
    remote = "https://github.com/open-telemetry/opentelemetry-cpp",
)

Then I added "@opentelemetry-cpp//exporters/otlp:otlp_http_exporter" into deps in my BUILD file. I also tried experimenting with various strip_prefix and build_file rules, but the best outcome was an error no such package '@github_nlohmann_json//'.

May I ask for a help/guidance how to use opentelemetry-cpp as a dependency in a another bazel project? Reproducible example would be great.

Thank you in advance.

[lalitb]

As mentioned here: https://github.com/open-telemetry/opentelemetry-cpp/blob/main/INSTALL.md#build-instructions-using-bazel, bazel support is experimental, so any contribution here to make it complete are welcome :) cc @jsuereth

[jlisee]

You need to call opentelemetry_cpp_deps from the bazel/repository.bzl

Your WORKSPACE file (if this snippet works it needs to be added to the INSTALL doc as listed above):

# https://github.com/open-telemetry/opentelemetry-cpp
new_git_repo
    name = "opentelemetry-cpp",
    commit = "096c08b6b6dbd8645eebdccc8c06b83fa7a50cd3",
    remote = "https://github.com/open-telemetry/opentelemetry-cpp",
)

load("@opentelemetry-cpp//bazel:repository.bzl", "opentelemetry_cpp_deps")

opentelemetry_cpp_deps()

Either that or pull in all the external repositories it needs yourself directly.

[lalitb]

Thanks, @jlisee. This is how httpd instrumentation uses it too: https://github.com/open-telemetry/opentelemetry-cpp-contrib/blob/main/instrumentation/httpd/WORKSPACE. Will test it once, and update INSTALL doc.

[miiila]

@jlisee Thank you very much! I will try this as soon as I can and post results here.

[miiila]

@lalitb @jlisee I have some updates :-) First of all - thank you again @jlisee for your suggestions. Provided solution works with two caveats:

• your repository needs to have name io_opentelemetry_cpp, otherwise things like https://github.com/open-telemetry/opentelemetry-cpp/blob/main/bazel/repository.bzl#L56 doesn't work
• curl build file is set to current repository (@), what doesn't work; here is PR fixing that, but I am bit scared by the CLA I need to sign and I want to check it more to understand what I am signing

[lalitb]

but I am bit scared by the CLA I need to sign and I want to check it more to understand what I am signing

@miiila - OpenTelemetry is hosted under CNCF ( https://www.cncf.io/, just like Kubernetes), and signing CLA is a pre-requisite for any contribution as a company, employee, or individual for CNCF hosted projects. As an individual, this is what you would sign for: https://github.com/cncf/cla/blob/master/individual-cla.pdf