Added support of persons.json file in root

.gitignore

@@ -30,4 +30,5 @@ uploads/*
 
 .idea
 
-data/persons.json*
+data/persons.json*
+persons.json

.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Launch Program",
+      "skipFiles": [
+        "<node_internals>/**"
+      ],
+      "program": "${workspaceFolder}\\index.js"
+    }
+  ]
+}

modules/postgres.js

@@ -1,103 +1,127 @@
-var pg = require('pg');
+var pg = require("pg");
+var path = require("path");
+var fs = require("fs");
 var connectionString = process.env.PRODUCTION
-    ? process.env.DATABASE_URL
-    : 'postgres://postgres:12qw34er56ty@localhost:5432/postgres';
+  ? process.env.DATABASE_URL
+  : "postgres://postgres:12qw34er56ty@localhost:5432/postgres";
 
 function createClient() {
-    return new pg.Client({ connectionString, ssl: { rejectUnauthorized: false } });
+  return new pg.Client({
+    connectionString,
+    ssl: { rejectUnauthorized: false },
+  });
+}
+
+function readPersonsFile() {
+  var content;
+  try {
+    content = fs.readFileSync(path.resolve(__dirname, "..", "persons.json"), {
+      encoding: "utf8",
+    });
+  } catch (e) {}
+  return content ? JSON.parse(content) : null;
 }
 
 function createTableIf(cb) {
-    var client = createClient();
-    client.connect();
-    client.query('SELECT * FROM files', function (err, result) {
-        if (err) {
+  var client = createClient();
+  client.connect();
+  client.query("SELECT * FROM files", function (err, result) {
+    if (err) {
+      client.query(
+        "CREATE TABLE files(id SERIAL PRIMARY KEY, body VARCHAR(10000000))",
+        function (err, result) {
+          if (err) {
+            client.end();
+            cb(err);
+          } else {
             client.query(
-                'CREATE TABLE files(id SERIAL PRIMARY KEY, body VARCHAR(10000000))',
-                function (err, result) {
-                    if (err) {
-                        client.end();
-                        cb(err);
-                    } else {
-                        client.query(
-                            'INSERT INTO files(body) VALUES($1)',
-                            ['{}'],
-                            function (err, result) {
-                                if (err) {
-                                    client.end();
-                                    cb(err);
-                                } else {
-                                    cb();
-                                }
-                            }
-                        );
-                    }
+              "INSERT INTO files(body) VALUES($1)",
+              ["{}"],
+              function (err, result) {
+                if (err) {
+                  client.end();
+                  cb(err);
+                } else {
+                  cb();
                 }
+              }
             );
-        } else {
-            client.end();
-            cb();
+          }
         }
-    });
+      );
+    } else {
+      client.end();
+      cb();
+    }
+  });
 }
 
 function select(sql, pars, cb) {
-    var client = createClient();
-    var fn = function (err, result) {
-        if (err) {
-            cb(err);
-        } else {
-            client.end();
-            cb(null, result);
-        }
-    };
-    client.connect(function (err) {
-        if (err) {
-            cb(err);
-        }
-        client.query(sql, pars ? pars : fn, pars ? fn : undefined);
-    });
+  var client = createClient();
+  var fn = function (err, result) {
+    if (err) {
+      cb(err);
+    } else {
+      client.end();
+      cb(null, result);
+    }
+  };
+  client.connect(function (err) {
+    if (err) {
+      cb(err);
+    }
+    client.query(sql, pars ? pars : fn, pars ? fn : undefined);
+  });
 }
 
 function wrap(cb) {
-    createTableIf(function (err) {
-        if (err) {
-            cb(err);
-        } else {
-            cb();
-        }
-    });
+  createTableIf(function (err) {
+    if (err) {
+      cb(err);
+    } else {
+      cb();
+    }
+  });
 }
 
 module.exports = {
-    getPersonsJson: function (cb) {
-        wrap(function (err) {
-            if (err) {
-                cb(err);
-            } else {
-                select('SELECT * FROM files', null, function (err, result) {
-                    if (err) {
-                        cb(err);
-                    } else {
-                        cb(null, JSON.parse(result.rows[0].body));
-                    }
-                });
-            }
+  getPersonsJson: function (cb) {
+    var personsFromFile = readPersonsFile();
+    if (personsFromFile) {
+      cb(null, personsFromFile);
+      return;
+    }
+    wrap(function (err) {
+      if (err) {
+        cb(err);
+      } else {
+        select("SELECT * FROM files", null, function (err, result) {
+          if (err) {
+            cb(err);
+          } else {
+            cb(null, JSON.parse(result.rows[0].body));
+          }
         });
-    },
-    setPersons: function (strPersons, cb) {
-        wrap(function (err) {
+      }
+    });
+  },
+  setPersons: function (strPersons, cb) {
+    wrap(function (err) {
+      if (err) {
+        cb(err);
+      } else {
+        select(
+          "UPDATE files SET body = ($1)",
+          [strPersons],
+          function (err, result) {
             if (err) {
-                cb(err);
+              cb(err);
             } else {
-                select('UPDATE files SET body = ($1)', [strPersons], function (err, result) {
-                    if (err) {
-                        cb(err);
-                    } else {
-                        cb();
-                    }
-                });
+              cb();
             }
-        });
-    },
+          }
+        );
+      }
+    });
+  },
 };