per_file_coverage.sh

#!/usr/bin/env bash

# directory:coverage_percent
# for existing directories with low coverage.
declare -a KNOWN_LOW_COVERAGE=(
"source/common:96.4"
"source/common/common/posix:96.2" # flaky due to posix: be careful adjusting
"source/common/config:96.4"
"source/common/crypto:95.5"
"source/common/event:95.6" # Emulated edge events guards don't report LCOV
"source/common/filesystem/posix:96.3" # FileReadToEndNotReadable fails in some env; createPath can't test all failure branches.
"source/common/http/http2:96.1"
"source/common/json:95.2"
"source/common/matcher:94.7"
"source/common/memory:74.5" # tcmalloc code path is not enabled in coverage build, only gperf tcmalloc, see PR#32589
"source/common/network:94.4" # Flaky, `activateFileEvents`, `startSecureTransport` and `ioctl`, listener_socket do not always report LCOV
"source/common/network/dns_resolver:91.4"  # A few lines of MacOS code not tested in linux scripts. Tested in MacOS scripts
"source/common/quic:93.3"
"source/common/signal:87.2" # Death tests don't report LCOV
"source/common/thread:0.0" # Death tests don't report LCOV
"source/common/tls:95.5"
"source/common/tls/cert_validator:94.7"
"source/common/tls/private_key:88.9"
"source/common/watchdog:58.6" # Death tests don't report LCOV
"source/exe:94.2" # increased by #32346, need coverage for terminate_handler and hot restart failures
"source/extensions/common/proxy_protocol:93.8" # Adjusted for security patch
"source/extensions/common/tap:94.6"
"source/extensions/common/wasm:95.3" # flaky: be careful adjusting
"source/extensions/common/wasm/ext:92.0"
"source/extensions/filters/common/fault:94.5"
"source/extensions/filters/common/rbac:92.6"
"source/extensions/filters/http/cache:95.9"
"source/extensions/filters/http/grpc_json_reverse_transcoder: 94.8"
"source/extensions/filters/http/grpc_json_transcoder:94.0" # TODO(#28232)
"source/extensions/filters/http/ip_tagging:90.6"
"source/extensions/filters/http/kill_request:91.7" # Death tests don't report LCOV
"source/extensions/filters/http/oauth2:96.4"
"source/extensions/filters/listener/original_src:92.1"
"source/extensions/filters/network/mongo_proxy:96.1"
"source/extensions/filters/network/sni_cluster:88.9"
"source/extensions/rate_limit_descriptors:95.0"
"source/extensions/rate_limit_descriptors/expr:95.0"
"source/extensions/stat_sinks/graphite_statsd:82.8" # Death tests don't report LCOV
"source/extensions/stat_sinks/statsd:85.2" # Death tests don't report LCOV
"source/extensions/tracers/zipkin:95.8"
"source/extensions/wasm_runtime/wamr:0.0" # Not enabled in coverage build
"source/extensions/wasm_runtime/wasmtime:0.0" # Not enabled in coverage build
"source/extensions/watchdog:83.3" # Death tests within extensions
"source/extensions/listener_managers:77.3"
"source/extensions/listener_managers/validation_listener_manager:77.3"
"source/extensions/watchdog/profile_action:83.3"
"source/server:91.0" # flaky: be careful adjusting. See https://github.com/envoyproxy/envoy/issues/15239
"source/server/config_validation:92.3"
"source/extensions/health_checkers:96.1"
"source/extensions/health_checkers/http:93.9"
"source/extensions/health_checkers/grpc:92.1"
"source/extensions/config_subscription/rest:94.8"
"source/extensions/matching/input_matchers/cel_matcher:91.3" #Death tests don't report LCOV
)

[[ -z "${SRCDIR}" ]] && SRCDIR="${PWD}"
COVERAGE_DIR="${SRCDIR}"/generated/coverage
COVERAGE_DATA="${COVERAGE_DIR}/coverage.dat"

FAILED=0
DEFAULT_COVERAGE_THRESHOLD=96.6
DIRECTORY_THRESHOLD=$DEFAULT_COVERAGE_THRESHOLD

# Unfortunately we have a bunch of preexisting directory with low coverage.
# Set their low bar as their current coverage level.
get_coverage_target() {
  DIRECTORY_THRESHOLD=$DEFAULT_COVERAGE_THRESHOLD
  for FILE_PERCENT in "${KNOWN_LOW_COVERAGE[@]}"
  do
    if [[ $FILE_PERCENT =~ $1: ]]; then
      DIRECTORY_THRESHOLD="${FILE_PERCENT//*:/}"
      return
    fi
  done
}

# Make sure that for each directory with code, coverage doesn't dip
# below the default coverage threshold.
SOURCES=$(find source/* -type d)
HIGH_COVERAGE_STRING=""
while read -r DIRECTORY
do
  get_coverage_target "$DIRECTORY"
  COVERAGE_VALUE=$(lcov -e "$COVERAGE_DATA"  "${DIRECTORY}/*" -o /dev/null | grep line |  cut -d ' ' -f 4)
  COVERAGE_VALUE=${COVERAGE_VALUE%?}
  # If the coverage number is 'n' (no data found) there is 0% coverage. This is
  # probably a directory without source code, so we skip checks.
  #
  # We could insist that we validate that 0% coverage directories are in a
  # documented list, but instead of adding busy-work for folks adding
  # non-source-containing directories, we trust reviewers to notice if there's
  # absolutely no tests for a full directory.
  if [[ $COVERAGE_VALUE =~ "n" ]]; then
    continue;
  fi;
  COVERAGE_FAILED=$(echo "${COVERAGE_VALUE}<${DIRECTORY_THRESHOLD}" | bc)
  if [[ "${COVERAGE_FAILED}" -eq 1 ]]; then
    echo "Code coverage for ${DIRECTORY} is lower than limit of ${DIRECTORY_THRESHOLD} (${COVERAGE_VALUE})"
    FAILED=1
  fi
  COVERAGE_HIGH=$(echo "${COVERAGE_VALUE}>${DIRECTORY_THRESHOLD}" | bc)
  if [[ (${DIRECTORY_THRESHOLD} != "${DEFAULT_COVERAGE_THRESHOLD}") && "${COVERAGE_HIGH}" -eq 1 ]]; then
    HIGH_COVERAGE_STRING+="\"${DIRECTORY}:${COVERAGE_VALUE} (${DIRECTORY_THRESHOLD})\"\n"
  fi
  if [[ -n ${VERBOSE} && ${COVERAGE_VALUE} > ${DIRECTORY_THRESHOLD} ]]; then
    if [[ ${DIRECTORY_THRESHOLD} < $DEFAULT_COVERAGE_THRESHOLD ]]; then
      echo "Code coverage for ${DIRECTORY} is now ${COVERAGE_VALUE} (previously ${DIRECTORY_THRESHOLD})"
    fi
  fi

done <<< "$SOURCES"

if [[ ${FAILED} != 1 ]]; then
  echo -e "Coverage in the following directories may be adjusted up:\n ${HIGH_COVERAGE_STRING}"
fi

exit $FAILED