json-rpc error handling (#128)

* json-rpc error handling

* partial revert

dev/json-rpc.js

@@ -0,0 +1,18 @@
+const rpc = require('../lib/plugins/common/json-rpc')
+
+const account = {
+  username: 'test',
+  password: 'test'
+}
+
+const method = {}
+
+const params = {
+  url: 'https://httpstat.us/500'
+  // url: 'https://httpstat.us/400'
+  // url: 'https://httpstat.us/200'
+}
+
+rpc.fetch(account, method, params)
+  .then(res => console.log('got result', res))
+  .catch(err => console.error('gor error', err))

lib/plugins/common/json-rpc.js

@@ -2,32 +2,37 @@
 const axios = require('axios')
 const uuid = require('uuid')
 const fs = require('fs')
+const _ = require('lodash/fp')
 
 module.exports = {fetch, parseConf}
 
 function fetch (account, method, params) {
-  const data = {
-    method,
-    params,
-    id: uuid.v4()
-  }
+  return Promise.resolve(true)
+    .then(() => {
+      const data = {
+        method,
+        params,
+        id: uuid.v4()
+      }
+      const url = _.defaultTo(`http://localhost:${account.port}`, params.url)
 
-  return axios({
-    method: 'post',
-    auth: {username: account.username, password: account.password},
-    url: `http://localhost:${account.port}`,
-    data
-  })
+      return axios({
+        method: 'post',
+        auth: {username: account.username, password: account.password},
+        url,
+        data
+      })
+    })
     .then(r => {
       if (r.error) throw r.error
       return r.data.result
     })
     .catch(err => {
-      console.log(err.message)
-      try {
-        console.log(err.response.data.error)
-      } catch (__) {}
-      throw err
+      throw new Error(_.join(' ', [
+        'json-rpc::axios error:',
+        _.get('message', err, ''),
+        _.get('response.data.error', err, '')
+      ]))
     })
 }