feat: exposed rotating-file log for json logging (#948)

This both allows for logger type 'rotating-file' and
passing of other options from the config "option" example:
{type: rotating-file, format: json, path: /path/to/log.jsonl, level: http, options: {period: 1d}}

conf/full.yaml

@@ -126,7 +126,8 @@ packages:
 #
 # parameters for file: name is filename
 #  {type: 'file', path: 'verdaccio.log', level: 'debug'},
-#
+# Rotating log stream. Options are passed directly to bunyan. See: https://github.com/trentm/node-bunyan#stream-type-rotating-file
+# {type: rotating-file, format: json, path: /path/to/log.jsonl, level: http, options: {period: 1d}}
 # parameters for stdout and stderr: format: json | pretty | pretty-timestamped
 #  {type: 'stdout', format: 'pretty', level: 'debug'},
 logs:

docs/logger.md

@@ -11,9 +11,12 @@ logs:
   - {type: stdout, format: pretty, level: http}
   # file output
   - {type: file, path: verdaccio.log, level: info}
+  # Rotating log stream. Options are passed directly to bunyan. See: https://github.com/trentm/node-bunyan#stream-type-rotating-file
+  - {type: rotating-file, format: json, path: /path/to/log.jsonl, level: http, options: {period: 1d}}
 ```
 
 Use `SIGUSR2` to notify the application, the log-file was rotated and it needs to reopen it.
+Note: Rotating log stream is not supported in cluster mode. [See here](https://github.com/trentm/node-bunyan#stream-type-rotating-file)
 
 ### Configuration
 

package.json

@@ -43,6 +43,7 @@
     "mime": "2.3.1",
     "minimatch": "3.0.4",
     "mkdirp": "0.5.1",
+    "mv": "2.1.1",
     "pkginfo": "0.4.1",
     "request": "2.87.0",
     "semver": "5.5.0",

src/lib/logger.js

@@ -1,9 +1,11 @@
+const cluster = require('cluster');
 const Logger = require('bunyan');
 const Error = require('http-errors');
 const Stream = require('stream');
 const chalk = require('chalk');
 const Utils = require('./utils');
 const pkgJSON = require('../../package.json');
+const _ = require('lodash');
 
 /**
  * Match the level based on buyan severity scale
@@ -22,6 +24,16 @@ function getlvl(x) {
   }
 }
 
+/**
+ * A RotatingFileStream that modifes the message first
+ */
+class VerdaccioRotatingFileStream extends Logger.RotatingFileStream { // We depend on mv so that this is there
+  write(obj) {
+    const msg = fillInMsgTemplate(obj.msg, obj, false);
+    super.write(JSON.stringify({...obj, msg}, Logger.safeCycles()) + '\n');
+  }
+}
+
 /**
  * Setup the Buyan logger
  * @param {*} logs list of log configuration
@@ -33,28 +45,50 @@ function setup(logs) {
   }
 
   logs.forEach(function(target) {
+    let level = target.level || 35;
+    if (level === 'http') {
+      level = 35;
+    }
+
     // create a stream for each log configuration
+    if (target.type === 'rotating-file') {
+      if (target.format !== 'json') {
+        throw new Error('Rotating file streams only work with JSON!');
+      }
+      if (cluster.isWorker) {
+        // https://github.com/trentm/node-bunyan#stream-type-rotating-file
+        throw new Error('Cluster mode is not supported for rotating-file!');
+      }
+
+      const stream = new VerdaccioRotatingFileStream(
+        _.merge({},
+          // Defaults can be found here: https://github.com/trentm/node-bunyan#stream-type-rotating-file
+          target.options || {},
+          {path: target.path, level})
+      );
+
+      streams.push(
+          {
+            type: 'raw',
+            level,
+            stream,
+          }
+        );
+    } else {
       const stream = new Stream();
       stream.writable = true;
 
-    let dest;
-    let destIsTTY = false;
-    const prettyPrint = (obj) => print(obj.level, obj.msg, obj, destIsTTY) + '\n';
-    const prettyTimestampedPrint = (obj) => obj.time.toISOString() + print(obj.level, obj.msg, obj, destIsTTY) + '\n';
-    const jsonPrint = (obj) => {
-      const msg = fillInMsgTemplate(obj.msg, obj, destIsTTY);
-      return JSON.stringify({...obj, msg}, Logger.safeCycles()) + '\n';
-    };
-
+      let destination;
+      let destinationIsTTY = false;
       if (target.type === 'file') {
         // destination stream
-      dest = require('fs').createWriteStream(target.path, {flags: 'a', encoding: 'utf8'});
-      dest.on('error', function(err) {
-        Logger.emit('error', err);
+        destination = require('fs').createWriteStream(target.path, {flags: 'a', encoding: 'utf8'});
+        destination.on('error', function(err) {
+          stream.emit('error', err);
         });
       } else if (target.type === 'stdout' || target.type === 'stderr') {
-      dest = target.type === 'stdout' ? process.stdout : process.stderr;
-      destIsTTY = dest.isTTY;
+        destination = target.type === 'stdout' ? process.stdout : process.stderr;
+        destinationIsTTY = destination.isTTY;
       } else {
         throw Error('wrong target type for a log');
       }
@@ -62,26 +96,26 @@ function setup(logs) {
       if (target.format === 'pretty') {
         // making fake stream for prettypritting
         stream.write = (obj) => {
-        dest.write(prettyPrint(obj));
+          destination.write(`${print(obj.level, obj.msg, obj, destinationIsTTY)}\n`);
         };
       } else if (target.format === 'pretty-timestamped') {
         // making fake stream for pretty pritting
         stream.write = (obj) => {
-        dest.write(prettyTimestampedPrint(obj));
+          destination.write(`${obj.time.toISOString()}${print(obj.level, obj.msg, obj, destinationIsTTY)}\n`);
         };
       } else {
         stream.write = (obj) => {
-        dest.write(jsonPrint(obj));
+          const msg = fillInMsgTemplate(obj.msg, obj, destinationIsTTY);
+          destination.write(`${JSON.stringify({...obj, msg}, Logger.safeCycles())}\n`);
         };
       }
 
-
-    if (target.level === 'http') target.level = 35;
       streams.push({
         type: 'raw',
-      level: target.level || 35,
+        level,
         stream: stream,
       });
+    }
   });
 
   // buyan default configuration