#!/bin/bash

if [[ `uname -a` = *"Darwin"* ]]; then
  echo "It seems you are running on Mac. This script does not work on Mac. See https://github.com/grpc/grpc-go/issues/2047"
  exit 1
fi

set -ex  # Exit on error; debugging enabled.
set -o pipefail  # Fail a pipe if any sub-command fails.

die() {
  echo "$@" >&2
  exit 1
}

fail_on_output() {
  tee /dev/stderr | (! read)
}

# Check to make sure it's safe to modify the user's git repo.
git status --porcelain | fail_on_output

# Undo any edits made by this script.
cleanup() {
  git reset --hard HEAD
}
trap cleanup EXIT

PATH="${GOPATH}/bin:${GOROOT}/bin:${PATH}"

if [[ "$1" = "-install" ]]; then
  # Check for module support
  if go help mod >& /dev/null; then
    # Install the pinned versions as defined in module tools.
    pushd ./test/tools
    go install \
      golang.org/x/lint/golint \
      golang.org/x/tools/cmd/goimports \
      honnef.co/go/tools/cmd/staticcheck \
      github.com/client9/misspell/cmd/misspell \
      github.com/golang/protobuf/protoc-gen-go
    popd
  else
    # Ye olde `go get` incantation.
    # Note: this gets the latest version of all tools (vs. the pinned versions
    # with Go modules).
    go get -u \
      golang.org/x/lint/golint \
      golang.org/x/tools/cmd/goimports \
      honnef.co/go/tools/cmd/staticcheck \
      github.com/client9/misspell/cmd/misspell \
      github.com/golang/protobuf/protoc-gen-go
  fi
  if [[ -z "${VET_SKIP_PROTO}" ]]; then
    if [[ "${TRAVIS}" = "true" ]]; then
      PROTOBUF_VERSION=3.3.0
      PROTOC_FILENAME=protoc-${PROTOBUF_VERSION}-linux-x86_64.zip
      pushd /home/travis
      wget https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/${PROTOC_FILENAME}
      unzip ${PROTOC_FILENAME}
      bin/protoc --version
      popd
    elif ! which protoc > /dev/null; then
      die "Please install protoc into your path"
    fi
  fi
  exit 0
elif [[ "$#" -ne 0 ]]; then
  die "Unknown argument(s): $*"
fi

# - Ensure all source files contain a copyright message.
(! git grep -L "\(Copyright [0-9]\{4,\} gRPC authors\)\|DO NOT EDIT" -- '*.go')

# - Make sure all tests in grpc and grpc/test use leakcheck via Teardown.
(! grep 'func Test[^(]' *_test.go)
(! grep 'func Test[^(]' test/*.go)

# - Do not import x/net/context.
(! git grep -l 'x/net/context' -- "*.go")

# - Do not import math/rand for real library code.  Use internal/grpcrand for
#   thread safety.
git grep -l '"math/rand"' -- "*.go" 2>&1 | (! grep -v '^examples\|^stress\|grpcrand\|^benchmark\|wrr_test')

# - Ensure all ptypes proto packages are renamed when importing.
(! git grep "\(import \|^\s*\)\"github.com/golang/protobuf/ptypes/" -- "*.go")

# - Check imports that are illegal in appengine (until Go 1.11).
# TODO: Remove when we drop Go 1.10 support
go list -f {{.Dir}} ./... | xargs go run test/go_vet/vet.go

# - gofmt, goimports, golint (with exceptions for generated code), go vet.
gofmt -s -d -l . 2>&1 | fail_on_output
goimports -l . 2>&1 | (! grep -vE "(_mock|\.pb)\.go")
golint ./... 2>&1 | (! grep -vE "(_mock|\.pb)\.go:")
go vet -all ./...

misspell -error .

# - Check that generated proto files are up to date.
if [[ -z "${VET_SKIP_PROTO}" ]]; then
  PATH="/home/travis/bin:${PATH}" make proto && \
    git status --porcelain 2>&1 | fail_on_output || \
    (git status; git --no-pager diff; exit 1)
fi

# - Check that our module is tidy.
if go help mod >& /dev/null; then
  go mod tidy && \
    git status --porcelain 2>&1 | fail_on_output || \
    (git status; git --no-pager diff; exit 1)
fi

# - Collection of static analysis checks
#
# TODO(dfawley): don't use deprecated functions in examples or first-party
# plugins.
SC_OUT="$(mktemp)"
staticcheck -go 1.9 -checks 'inherit,-ST1015' ./... > "${SC_OUT}" || true
# Error if anything other than deprecation warnings are printed.
(! grep -v "is deprecated:.*SA1019" "${SC_OUT}")
# Only ignore the following deprecated types/fields/functions.
(! grep -Fv '.HandleResolvedAddrs
.HandleSubConnStateChange
.HeaderMap
.NewAddress
.NewServiceConfig
.Metadata is deprecated: use Attributes
.Type is deprecated: use Attributes
.UpdateBalancerState
balancer.Picker
grpc.CallCustomCodec
grpc.Code
grpc.Compressor
grpc.Decompressor
grpc.MaxMsgSize
grpc.MethodConfig
grpc.NewGZIPCompressor
grpc.NewGZIPDecompressor
grpc.RPCCompressor
grpc.RPCDecompressor
grpc.RoundRobin
grpc.ServiceConfig
grpc.WithBalancer
grpc.WithBalancerName
grpc.WithCompressor
grpc.WithDecompressor
grpc.WithDialer
grpc.WithMaxMsgSize
grpc.WithServiceConfig
grpc.WithTimeout
http.CloseNotifier
info.SecurityVersion
naming.Resolver
naming.Update
naming.Watcher
resolver.Backend
resolver.GRPCLB' "${SC_OUT}"
)