fix(utils): updated regex match and made failed matches safer (#599)

Author: ronnathaniel

src/config.js

@@ -241,6 +241,10 @@ module.exports.setConfig = function setConfig(configData) {
         config.disableHttpResponseBodyCapture = configData.disableHttpResponseBodyCapture;
     }
 
+    if (configData.allowErrMessageStatus) {
+        config.allowErrMessageStatus = configData.allowErrMessageStatus;
+    }
+
     // Keys to automatically capture and label
     if (configData.keysToAllow) {
         config.keysToAllow = module.exports.prepareMatchingKeys(configData.keysToAllow);

src/utils.js

@@ -208,19 +208,24 @@ function distinct(arr) {
  * Attempt to extract an HTTP Status Code from a String.
  * Matches and returns only 3-digit numbers in range 2XX-5XX.
  * @param {String} message A String containing a Status Code.
- * @return {Number} extracted Status Code. If not found -> 0, the only falsy Number.
- */
-function extractStatusCode(message) {
-    // matches a [Non-Digit], [2xx - 5xx], and a [Non-Digit]. globally & multiline.
-    //              \D        ([2-5]\d{2})          \D            /g         m
-    const statusCodeMatch = /\D([2-5]\d{2})\D/gm;
-    const statusCodes = message
-        .match(statusCodeMatch)
-        .map(m => m.replace(statusCodeMatch, '$1'));
-    if (statusCodes && statusCodes.length) {
-        return Number(statusCodes[0]);
+ * @param {Number} defaultCode The defaulting Status Code if none are found.
+ *                              0 is chosen as the only falsy Number to avoid being added.
+ * @return {Number} extracted Status Code.
+ */
+function extractStatusCode(message, defaultCode = 0) {
+    // matches a [Non-Digit or SOL], [2xx - 5xx], and a [Non-Digit or EOL]. globally & multiline.
+    //                (?:^|\D)       ([2-5]\d{2})          (?:$|\D)        /g          m
+    const statusCodeMatch = /(?:^|\D)([2-5]\d{2})(?:$|\D)/gm;
+    const matches = message
+        .match(statusCodeMatch);
+    if (matches === null || !matches.length) {
+        debugLog('Could not extract Status Code from Message:', message);
+        debugLog('Defaulting Status to', defaultCode);
+        return defaultCode;
     }
-    return 0;
+    const statusCodes = matches
+        .map(m => m.replace(statusCodeMatch, '$1'));
+    return Number(statusCodes[0]);
 }
 
 module.exports.createTimestampFromTime = createTimestampFromTime;

test/unit_tests/test_config.js

@@ -1,6 +1,7 @@
 const { expect } = require('chai');
 const consts = require('../../src/consts.js');
 const config = require('../../src/config.js');
+const utils = require('../../src/utils.js');
 
 
 describe('tracer config tests', () => {
@@ -117,6 +118,47 @@ describe('tracer config tests', () => {
         expect(config.getConfig()).to.contain({ decodeHTTP: false });
     });
 
+    it('setConfig: set allowErrMessageStatus to true', () => {
+        config.setConfig({ allowErrMessageStatus: true });
+        expect(config.getConfig()).to.contain({ allowErrMessageStatus: true });
+    });
+
+    it('setConfig: set allowErrMessageStatus and match error message', () => {
+        config.setConfig({ allowErrMessageStatus: true });
+
+        const testCode = 324;
+        [
+            `{errorMessage: TEST-MESSAGE, statusCode: ${testCode}}`,
+            `errorMessage: TEST-MESSAGE, statusCode: ${testCode}`,
+            `{statusCode:${testCode}}`,
+            `{statusCode:${testCode}}`,
+            `Error - ${testCode}`,
+            `${testCode}`,
+            `${testCode}: errorMessage`,
+            `${testCode} - error has a message`,
+        ]
+            .forEach((m) => {
+                const statusCode = utils.extractStatusCode(m);
+                expect(statusCode).to.be.equal(testCode);
+            });
+    });
+
+    it('setConfig: set allowErrMessageStatus without matches', () => {
+        config.setConfig({ allowErrMessageStatus: true });
+
+        const defaultStatusCode = 900;
+        [
+            'test message',
+            'No Status Code Found',
+            '4123 is not a Status Code',
+            '22 is also not one.',
+        ]
+            .forEach((m) => {
+                const statusCode = utils.extractStatusCode(m, defaultStatusCode);
+                expect(statusCode).to.be.equal(defaultStatusCode);
+            });
+    });
+
     it('setConfig: set addReturnValue to false', () => {
         config.setConfig({ addReturnValue: false });
         expect(config.getConfig()).to.contain({ addReturnValue: false });