make+scripts+docs: update fuzzing script and make fuzz

scripts/fuzz.sh

@@ -2,58 +2,17 @@
 
 set -e
 
-function build_fuzz() {
-  PACKAGES=$1
-
-  for pkg in $PACKAGES; do
-    pushd fuzz/$pkg
-
-    for file in *.go; do
-      if [[ "$file" == "fuzz_utils.go" ]]; then
-        continue
-      fi
-
-      NAME=$(echo $file | sed 's/\.go$//1')
-      echo "Building zip file for $pkg/$NAME"
-      go-fuzz-build -func "Fuzz_$NAME" -o "$pkg-$NAME-fuzz.zip" "github.com/lightningnetwork/lnd/fuzz/$pkg"
-    done
-
-    popd
-  done
-}
-
-# timeout is a cross platform alternative to the GNU timeout command that
-# unfortunately isn't available on macOS by default.
-timeout() {
-    time=$1
-    $2 &
-    pid=$!
-    sleep $time
-    kill -s SIGINT $pid    
-}
-
 function run_fuzz() {
   PACKAGES=$1
   RUN_TIME=$2
-  TIMEOUT=$3
-  PROCS=$4
-  BASE_WORKDIR=$5
+  NUM_WORKERS=$3
 
   for pkg in $PACKAGES; do
-    pushd fuzz/$pkg
+    pushd $pkg
 
-    for file in *.go; do
-      if [[ "$file" == "fuzz_utils.go" ]]; then
-        continue
-      fi
-
-      NAME=$(echo $file | sed 's/\.go$//1')
-      WORKDIR=$BASE_WORKDIR/$pkg/$NAME
-      mkdir -p $WORKDIR
-      echo "Running fuzzer $pkg-$NAME-fuzz.zip with $PROCS processors for $RUN_TIME seconds"
-      COMMAND="go-fuzz -bin=$pkg-$NAME-fuzz.zip -workdir=$WORKDIR -procs=$PROCS -timeout=$TIMEOUT"
-      echo "$COMMAND"
-      timeout "$RUN_TIME" "$COMMAND"
+    go test -list=Fuzz.* | grep Fuzz | while read line; do
+        echo ----- Fuzz testing $pkg:$line for $2 with $3 workers -----
+        go test -fuzz=^$line\$ -fuzztime=$2 -parallel=$3
     done
 
     popd
@@ -63,8 +22,7 @@ function run_fuzz() {
 # usage prints the usage of the whole script.
 function usage() {
   echo "Usage: "
-  echo "fuzz.sh build <packages>"
-  echo "fuzz.sh run <packages> <run_time> <timeout>"
+  echo "fuzz.sh run <packages> <run_time>"
 }
 
 # Extract the sub command and remove it from the list of parameters by shifting
@@ -75,10 +33,6 @@ shift
 # Call the function corresponding to the specified sub command or print the
 # usage if the sub command was not found.
 case $SUBCOMMAND in
-build)
-  echo "Building fuzz packages"
-  build_fuzz "$@"
-  ;;
 run)
   echo "Running fuzzer"
   run_fuzz "$@"