use rpc.sh script for RPC healthcheck

Signed-off-by: Jakub Sokołowski <jakub@status.im>

tasks/consul.yml

@@ -1,20 +1,4 @@
 ---
-- name: Geth | Create sync check script
-  copy:
-    dest: '{{ geth_sync_check_script }}'
-    mode: 0755
-    content: |
-      #!/usr/bin/env bash
-      set -e
-      echo -n "Geth synced: "
-      RESP=$(curl -s -X POST \
-                 --connect-timeout 5 \
-                 -H 'Content-type:application/json' \
-                 --data '{"jsonrpc":"2.0","method":"eth_syncing","id":1}' \
-                 http://localhost:{{ geth_rpc_port }}/)
-      echo "${RESP}" | jq -e ".result == false" \
-          || ( echo "${RESP}" | jq . ; exit 1 )
-
 - name: Geth | Create Consul service definition
   include_role: name=consul-service
   vars:
@@ -43,8 +27,8 @@
           stage: '{{ stage }}'
         checks:
           - id: '{{ geth_cont_name }}-rpc-status'
-            type: script
-            script: '{{ geth_sync_check_script }}'
+            type: 'script'
+            script: '{{ geth_service_path }}/rpc.sh eth_syncing'
             timeout: '5s'
 
       - name: '{{ geth_cont_name }}-ws'

templates/rpc.sh.j2

@@ -1,30 +1,32 @@
 #!/usr/bin/env bash
+# vim: set ft=sh:
+set -euo pipefail
 
 URL="http://localhost:{{ geth_rpc_port }}/"
 
 METHOD="$1"
 shift
-PARAMS=("$@")
 
 if [[ -z "${METHOD}" ]]; then
     echo "No method specified!" >&2
     exit 1
 fi
-if [[ -n "${PARAMS}" ]]; then
-    PARAMS_STR=$(printf '%s\",\"' "${PARAMS[@]}")
-    PARAMS_STR="\"${PARAMS_STR%%\",\"}\""
+if [[ -n "${@}" ]]; then
+    PARAMS=$(printf '%s\",\"' "${@}")
+    PARAMS="\"${PARAMS_STR%%\",\"}\""
 else
-    PARAMS_STR=''
+    PARAMS=''
 fi
 
 PAYLOAD="{
   \"id\": 1,
   \"jsonrpc\": \"2.0\",
   \"method\": \"${METHOD}\",
-  \"params\": [${PARAMS_STR}]
+  \"params\": [${PARAMS}]
 }"
 
 curl -s -X POST \
     -H "Content-type:application/json" \
     --data "${PAYLOAD}" \
-    "${URL}" | jq .
+    "${URL}" | \
+    jq -e '., if .error != null then null|halt_error(2) else halt end'