Export coverage report to codecov (#995)

* Export coverage report to codecov

Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>

* Use orb and individual coverage files per module

* Run go cover inside module directory to account for local rewrites

Still try to upload using a single file, since orb docs seem to
indicate if you have more than one file, you're going to need to run
the orb multiple times.

* Use correct filename

* Don't do anything silly like appending a file to itself

* Handle subtle differences between FreeBSD and Linux

* Ignore opentelemetry-proto-gen files in exporters/otlp/internal

* Does codecov orb leave current directory in a bad state?

* Copy instead of move

* Ignore generated protobuf code in jaeger exporter module

Co-authored-by: Evan Torrie <evantorrie@users.noreply.github.com>
Co-authored-by: Anthony Mirabella <a9@aneurysm9.com>
Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

.circleci/config.yml

@@ -1,4 +1,6 @@
 version: 2.1
+orbs:
+  codecov: codecov/codecov@1.1.1
 executors:
   current-go:
     resource_class: large
@@ -25,7 +27,10 @@ build-template: &build-template
         name: "Precommit and Coverage Report"
         command: |
           make ci
-          mv coverage.html $TEST_RESULTS/
+          cp coverage.{out,txt,html} $TEST_RESULTS/
+
+    - codecov/upload:
+        file: "coverage.txt"
 
     - save_cache:
         key: cimg-go-pkg-mod-{{ checksum "go.sum" }}

.github/codecov.yaml

@@ -0,0 +1,24 @@
+codecov:
+  require_ci_to_pass: yes
+
+ignore:
+  - "exporters/otlp/internal/opentelemetry-proto-gen/**/*"
+  - "exporters/trace/jaeger/internal/gen-go/**/*"
+
+coverage:
+  precision: 1
+  round: down
+  range: "70...100"
+
+parsers:
+  gcov:
+    branch_detection:
+      conditional: yes
+      loop: yes
+      method: no
+      macro: no
+
+comment:
+  layout: "reach,diff,flags,tree"
+  behavior: default
+  require_changes: no

Makefile

@@ -33,7 +33,7 @@ endif
 
 GOTEST_MIN = go test -timeout 30s
 GOTEST = $(GOTEST_MIN) -race
-GOTEST_WITH_COVERAGE = $(GOTEST) -coverprofile=coverage.txt -covermode=atomic -coverpkg=./...
+GOTEST_WITH_COVERAGE = $(GOTEST) -coverprofile=coverage.out -covermode=atomic -coverpkg=./...
 
 .DEFAULT_GOAL := precommit
 
@@ -61,12 +61,17 @@ precommit: generate build lint examples test
 
 .PHONY: test-with-coverage
 test-with-coverage:
-	set -e; for dir in $(ALL_COVERAGE_MOD_DIRS); do \
+	set -e; \
+	printf "" > coverage.txt; \
+	for dir in $(ALL_COVERAGE_MOD_DIRS); do \
 	  echo "go test ./... + coverage in $${dir}"; \
 	  (cd "$${dir}" && \
 	 	$(GOTEST_WITH_COVERAGE) ./... && \
-	    go tool cover -html=coverage.txt -o coverage.html); \
+		go tool cover -html=coverage.out -o coverage.html); \
-	done
+      [ -f "$${dir}/coverage.out" ] && cat "$${dir}/coverage.out" >> coverage.txt; \
+	done; \
+	sed -i.bak -e '2,$$ { /^mode: /d; }' coverage.txt
+
 
 .PHONY: ci
 ci: precommit check-clean-work-tree license-check test-with-coverage test-386