Two small tweaks for ease of use (hyperledger-labs#300)

* Print server running/stopped messages

That wasn't clear from docs or the 'running commentary'

Signed-off-by: Jacob Kopczynski <[email protected]>

* Export explorerconfig.json

Signed-off-by: Jacob Kopczynski <[email protected]>

README.md

@@ -278,7 +278,9 @@ $ cd blockchain-explorer/app
     $ createdb `whoami`
     ```
 
-Connect to the PostgreSQL database and run DB status commands:
+Connect to the PostgreSQL database and run DB status commands. To export the
+settings from `app/explorerconfig.json` to the environment, run `source
+app/exportConfig.sh`; this will set `$DATABASE_DATABASE` and related envvars.
 
 * **Ubuntu**
 
@@ -373,7 +375,7 @@ $ npm run build
     ```
 
 * `npm start`
-  * It will have the backend and GUI service up
+  * It will have the backend and GUI service up, for as long as the process runs
 
 * `npm run app-stop`
   * It will stop the node server

app/exportConfig.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+echo "should be sourced"
+jq . ./explorerconfig.json >/dev/null
+
+export DATABASE_HOST=$(jq -r '.postgreSQL.host' ./explorerconfig.json)
+export DATABASE_PORT=$(jq -r '.postgreSQL.port' ./explorerconfig.json)
+export DATABASE_USERNAME=$(jq -r '.postgreSQL.username' ./explorerconfig.json)
+export DATABASE_DATABASE=$(jq -r '.postgreSQL.database' ./explorerconfig.json)
+export DATABASE_PASSWD=$(jq -r '.postgreSQL.passwd' ./explorerconfig.json)

start.sh

@@ -20,4 +20,11 @@ export LOG_CONSOLE_STDOUT=${LOG_CONSOLE_STDOUT:-false}
 export DISCOVERY_AS_LOCALHOST=${DISCOVERY_AS_LOCALHOST:-true}
 export EXPLORER_APP_ROOT=${EXPLORER_APP_ROOT:-dist}
 
+function log_exit() {
+  echo "Server stopped"
+  exit
+}
+trap log_exit SIGINT EXIT
+echo "Server running..."
+
 node ${EXPLORER_APP_ROOT}/main.js name - hyperledger-explorer