add retry for get() and post()

acme.sh

@@ -1768,7 +1768,7 @@ _inithttp() {
     if [ -z "$ACME_HTTP_NO_REDIRECTS" ]; then
       _ACME_CURL="$_ACME_CURL -L "
     fi
-    if [ "$DEBUG" ] && [ "$DEBUG" -ge "2" ]; then
+    if [ "$DEBUG" ] && [ "$DEBUG" -ge 2 ]; then
       _CURL_DUMP="$(_mktemp)"
       _ACME_CURL="$_ACME_CURL --trace-ascii $_CURL_DUMP "
     fi
@@ -1808,6 +1808,8 @@ _inithttp() {
 
 }
 
+_HTTP_MAX_RETRY=8
+
 # body  url [needbase64] [POST|PUT|DELETE] [ContentType]
 _post() {
   body="$1"
@@ -1815,6 +1817,33 @@ _post() {
   needbase64="$3"
   httpmethod="$4"
   _postContentType="$5"
+  _sleep_retry_sec=1
+  _http_retry_times=0
+  _hcode=0
+  while [ "${_http_retry_times}" -le "$_HTTP_MAX_RETRY" ]; do
+    [ "$_http_retry_times" = "$_HTTP_MAX_RETRY" ]
+    _lastHCode="$?"
+    _debug "Retrying post"
+    _post_impl "$body" "$_post_url" "$needbase64" "$httpmethod" "$_postContentType" "$_lastHCode";
+    _hcode="$?"
+    _debug _hcode "$_hcode"
+    if [ "$_hcode" = "0" ]; then
+      break;
+    fi
+    _http_retry_times=$(_math $_http_retry_times + 1)
+    _sleep $_sleep_retry_sec
+  done
+  return $_hcode
+}
+
+# body  url [needbase64] [POST|PUT|DELETE] [ContentType] [displayError]
+_post_impl() {
+  body="$1"
+  _post_url="$2"
+  needbase64="$3"
+  httpmethod="$4"
+  _postContentType="$5"
+  displayError="$6"
 
   if [ -z "$httpmethod" ]; then
     httpmethod="POST"
@@ -1866,7 +1895,9 @@ _post() {
     fi
     _ret="$?"
     if [ "$_ret" != "0" ]; then
+      if [ -z "$displayError" ] || [ "$displayError" = "0" ]; then
         _err "Please refer to https://curl.haxx.se/libcurl/c/libcurl-errors.html for error code: $_ret"
+      fi
       if [ "$DEBUG" ] && [ "$DEBUG" -ge "2" ]; then
         _err "Here is the curl dump log:"
         _err "$(cat "$_CURL_DUMP")"
@@ -1922,8 +1953,10 @@ _post() {
       _debug "wget returns 8, the server returns a 'Bad request' response, lets process the response later."
     fi
     if [ "$_ret" != "0" ]; then
+      if [ -z "$displayError" ] || [ "$displayError" = "0" ]; then
         _err "Please refer to https://www.gnu.org/software/wget/manual/html_node/Exit-Status.html for error code: $_ret"
       fi
+    fi
     _sed_i "s/^ *//g" "$HTTP_HEADER"
   else
     _ret="$?"
@@ -1936,13 +1969,38 @@ _post() {
 
 # url getheader timeout
 _get() {
+  url="$1"
+  onlyheader="$2"
+  t="$3"
+  _sleep_retry_sec=1
+  _http_retry_times=0
+  _hcode=0
+  while [ "${_http_retry_times}" -le "$_HTTP_MAX_RETRY" ]; do
+    [ "$_http_retry_times" = "$_HTTP_MAX_RETRY" ]
+    _lastHCode="$?"
+    _debug "Retrying GET"
+    _get_impl "$url" "$onlyheader" "$t" "$_lastHCode";
+    _hcode="$?"
+    _debug _hcode "$_hcode"
+    if [ "$_hcode" = "0" ]; then
+      break;
+    fi
+    _http_retry_times=$(_math $_http_retry_times + 1)
+    _sleep $_sleep_retry_sec
+  done
+  return $_hcode
+}
+
+# url getheader timeout displayError
+_get_impl() {
   _debug GET
   url="$1"
   onlyheader="$2"
   t="$3"
+  displayError="$4"
   _debug url "$url"
   _debug "timeout=$t"
-
+  _debug "displayError" "$displayError"
   _inithttp
 
   if [ "$_ACME_CURL" ] && [ "${ACME_USE_WGET:-0}" = "0" ]; then
@@ -1961,7 +2019,9 @@ _get() {
     fi
     ret=$?
     if [ "$ret" != "0" ]; then
+      if [ -z "$displayError" ] || [ "$displayError" = "0" ]; then
         _err "Please refer to https://curl.haxx.se/libcurl/c/libcurl-errors.html for error code: $ret"
+      fi
       if [ "$DEBUG" ] && [ "$DEBUG" -ge "2" ]; then
         _err "Here is the curl dump log:"
         _err "$(cat "$_CURL_DUMP")"
@@ -1987,8 +2047,10 @@ _get() {
       _debug "wget returns 8, the server returns a 'Bad request' response, lets process the response later."
     fi
     if [ "$ret" != "0" ]; then
+      if [ -z "$displayError" ] || [ "$displayError" = "0" ]; then
         _err "Please refer to https://www.gnu.org/software/wget/manual/html_node/Exit-Status.html for error code: $ret"
       fi
+    fi
   else
     ret=$?
     _err "Neither curl nor wget is found, can not do GET."