warn on missing credentials to access a restricted couch database

[maxlath]

for couch databases with a security document restricting the access, starting to sync without passing an admin username and password as Basic Auth in the database url (ex: http://username:pwd@localhost:5984/foo) results in couch2elastic4sync exiting silently, which looks a lot like a "everything went fine" behavior. The easiest fix I can see would be to log the error message returned by couchdb:

{"error":"unauthorized","reason":"You are not authorized to access this db."}

[ryanramage]

Good idea...

Do you see this output?

https://github.com/ryanramage/couch2elastic4sync/blob/master/bin/cli.js#L47-L48

[maxlath]

With a secured db but a url without Basic Auth:

• couch2elastic4sync --config=config.json load ends without logging anything (silently failing)
• couch2elastic4sync --config=config.json logs the following:

{"name":"couch2elastic4sync","hostname":"myhostname","pid":23086,"level":50,"msg":"an error occured no seq number in elasticsearch at http://localhost:9200/inventaire/_mapping/seq","time":"2016-08-20T17:55:04.579Z","v":0}
{"name":"couch2elastic4sync","hostname":"myhostname","pid":23086,"level":30,"msg":"since: now","time":"2016-08-20T17:55:04.581Z","v":0}
{"name":"couch2elastic4sync","hostname":"myhostname","pid":23086,"level":30,"msg":"endOnCatchup: false","time":"2016-08-20T17:55:04.581Z","v":0}
{"name":"couch2elastic4sync","hostname":"myhostname","pid":23086,"level":50,"err":{"message":"Bad DB response: {\"error\":\"unauthorized\",\"reason\":\"You are not authorized to access this db.\"}\n","name":"Error","stack":"Error: Bad DB response: {\"error\":\"unauthorized\",\"reason\":\"You are not authorized to access this db.\"}\n\n    at Request.db_response [as _callback] (/home/maxlath/.nvm/versions/node/v4.4.5/lib/node_modules/couch2elastic4sync/node_modules/follow/lib/feed.js:146:33)\n    at Request.self.callback (/home/maxlath/.nvm/versions/node/v4.4.5/lib/node_modules/couch2elastic4sync/node_modules/follow/node_modules/request/request.js:368:22)\n    at emitTwo (events.js:87:13)\n    at Request.emit (events.js:172:7)\n    at Request.<anonymous> (/home/maxlath/.nvm/versions/node/v4.4.5/lib/node_modules/couch2elastic4sync/node_modules/follow/node_modules/request/request.js:1219:14)\n    at emitOne (events.js:82:20)\n    at Request.emit (events.js:169:7)\n    at IncomingMessage.<anonymous> (/home/maxlath/.nvm/versions/node/v4.4.5/lib/node_modules/couch2elastic4sync/node_modules/follow/node_modules/request/request.js:1167:12)\n    at emitNone (events.js:72:20)\n    at IncomingMessage.emit (events.js:166:7)"},"msg":"Bad DB response: {\"error\":\"unauthorized\",\"reason\":\"You are not authorized to access this db.\"}\n","time":"2016-08-20T17:55:04.782Z","v":0}