swarm/dev: add development environment (#14332)

This PR adds a Swarm development environment which can be run in a
Docker container and provides scripts for building binaries and running
Swarm clusters.

swarm/dev/scripts/random-uploads.sh

@@ -0,0 +1,96 @@
+#!/bin/bash
+#
+# A script to upload random data to a swarm cluster.
+#
+# Example:
+#
+#   random-uploads.sh --addr 192.168.33.101:8500 --size 40k --count 1000
+
+set -e
+
+ROOT="$(cd "$(dirname "$0")/../../.." && pwd)"
+source "${ROOT}/swarm/dev/scripts/util.sh"
+
+DEFAULT_ADDR="localhost:8500"
+DEFAULT_UPLOAD_SIZE="40k"
+DEFAULT_UPLOAD_COUNT="1000"
+
+usage() {
+  cat >&2 <<USAGE
+usage: $0 [options]
+
+Upload random data to a Swarm cluster.
+
+OPTIONS:
+  -a, --addr ADDR     Swarm API address      [default: ${DEFAULT_ADDR}]
+  -s, --size SIZE     Individual upload size [default: ${DEFAULT_UPLOAD_SIZE}]
+  -c, --count COUNT   Number of uploads      [default: ${DEFAULT_UPLOAD_COUNT}]
+  -h, --help          Show this message
+USAGE
+}
+
+main() {
+  local addr="${DEFAULT_ADDR}"
+  local upload_size="${DEFAULT_UPLOAD_SIZE}"
+  local upload_count="${DEFAULT_UPLOAD_COUNT}"
+
+  parse_args "$@"
+
+  info "uploading ${upload_count} ${upload_size} random files to ${addr}"
+
+  for i in $(seq 1 ${upload_count}); do
+    info "upload ${i} / ${upload_count}:"
+    do_random_upload
+    echo
+  done
+}
+
+do_random_upload() {
+  curl -fsSL -X POST --data-binary "$(random_data)" "http://${addr}/bzzr:/"
+}
+
+random_data() {
+  dd if=/dev/urandom of=/dev/stdout bs="${upload_size}" count=1 2>/dev/null
+}
+
+parse_args() {
+  while true; do
+    case "$1" in
+      -h | --help)
+        usage
+        exit 0
+        ;;
+      -a | --addr)
+        if [[ -z "$2" ]]; then
+          fail "--addr flag requires an argument"
+        fi
+        addr="$2"
+        shift 2
+        ;;
+      -s | --size)
+        if [[ -z "$2" ]]; then
+          fail "--size flag requires an argument"
+        fi
+        upload_size="$2"
+        shift 2
+        ;;
+      -c | --count)
+        if [[ -z "$2" ]]; then
+          fail "--count flag requires an argument"
+        fi
+        upload_count="$2"
+        shift 2
+        ;;
+      *)
+        break
+        ;;
+    esac
+  done
+
+  if [[ $# -ne 0 ]]; then
+    usage
+    fail "ERROR: invalid arguments: $@"
+  fi
+}
+
+main "$@"