refactor: Use ServerlessError in pip

Author: pgrzesik

lib/pip.js

@@ -107,7 +107,7 @@ function generateRequirementsFile(
   }
 }
 
-async function pipAcceptsSystem(pythonBin) {
+async function pipAcceptsSystem(pythonBin, pluginInstance) {
   // Check if pip has Debian's --system option and set it if so
   try {
     const pipTestRes = await spawn(pythonBin, ['-m', 'pip', 'help', 'install']);
@@ -120,7 +120,10 @@ async function pipAcceptsSystem(pythonBin) {
       e.stderrBuffer &&
       e.stderrBuffer.toString().includes('command not found')
     ) {
-      throw new Error(`${pythonBin} not found! Try the pythonBin option.`);
+      throw new pluginInstance.serverless.classes.Error(
+        `${pythonBin} not found! Install it according to the poetry docs.`,
+        'PYTHON_REQUIREMENTS_PYTHON_NOT_FOUND'
+      );
     }
     throw e;
   }
@@ -167,10 +170,9 @@ async function installRequirements(targetFolder, pluginInstance) {
     // Check if we're using the legacy --cache-dir command...
     if (options.pipCmdExtraArgs.indexOf('--cache-dir') > -1) {
       if (options.dockerizePip) {
-        throw (
-          'Error: You can not use --cache-dir with Docker any more, please\n' +
-          '         use the new option useDownloadCache instead.  Please see:\n' +
-          '         https://github.com/UnitedIncome/serverless-python-requirements#caching'
+        throw new pluginInstance.serverless.classes.Error(
+          'You cannot use --cache-dir with Docker any more, please use the new option useDownloadCache instead. Please see: https://github.com/UnitedIncome/serverless-python-requirements#caching for more details.',
+          'PYTHON_REQUIREMENTS_CACHE_DIR_DOCKER_INVALID'
         );
       } else {
         if (log) {
@@ -222,7 +224,7 @@ async function installRequirements(targetFolder, pluginInstance) {
         pipCmd.push('--cache-dir', downloadCacheDir);
       }
 
-      if (await pipAcceptsSystem(options.pythonBin)) {
+      if (await pipAcceptsSystem(options.pythonBin, pluginInstance)) {
         pipCmd.push('--system');
       }
     }
@@ -358,7 +360,10 @@ async function installRequirements(targetFolder, pluginInstance) {
       if (Array.isArray(options.dockerRunCmdExtraArgs)) {
         dockerCmd.push(...options.dockerRunCmdExtraArgs);
       } else {
-        throw new Error('dockerRunCmdExtraArgs option must be an array');
+        throw new pluginInstance.serverless.classes.Error(
+          'dockerRunCmdExtraArgs option must be an array',
+          'PYTHON_REQUIREMENTS_INVALID_DOCKER_EXTRA_ARGS'
+        );
       }
 
       dockerCmd.push(dockerImage);
@@ -405,7 +410,10 @@ async function installRequirements(targetFolder, pluginInstance) {
             cmd.indexOf('python') > -1
               ? 'Try the pythonBin option'
               : 'Please install it';
-          throw new Error(`${cmd} not found! ${advice}`);
+          throw new pluginInstance.serverless.classes.Error(
+            `${cmd} not found! ${advice}`,
+            'PYTHON_REQUIREMENTS_COMMAND_NOT_FOUND'
+          );
         }
         throw e;
       }