exports.get = function()

in lib/services.js [116:149]

• 27 lines of code
• 8 McCabe index (conditional complexity)

exports.get = function(target, callback) {
  var roleArn = (target.role && (target.role.length > 0)) ? target.role : "none";

  if((! roles.hasOwnProperty(roleArn)) || (roles[roleArn].expiration < Date.now())) {

    // This role has not yet been impersonated, or has expired
    var stsSessionDuration = config.stsSessionDuration;
    var stsSessionRefreshMargin = config.stsSessionRefreshMargin;
    var stsSessionName = config.stsSessionName;

    var params = { RoleArn: roleArn, RoleSessionName: stsSessionName, DurationSeconds: stsSessionDuration };
    if(target.externalId) {
      params.ExternalId = target.externalId;
    }
    sts.assumeRole(params, function(err, data) {
      if(err) {
        // Unable to impersonate role, generate error
        console.error("Error creating service reference '" + target.id + "', an error occured while impersonating role '" + roleArn + "':", err);
        callback(new Error("Error assuming role '" + roleArn + "'"), null);
      } else {
        if(config.debug) {
          console.log("Assumed role '" + roleArn + "'");
        }
        // Clear all values, and force service refresh 5 seconds before end of impersonation
        var role = { services: {}, credentials: sts.credentialsFrom(data), expiration: Date.now() + ((stsSessionDuration - stsSessionRefreshMargin) * 1000) };
        roles[roleArn] = role;
        ensureService(target, role, callback);
      }
    });
  } else {
    // We have a valid role, reuse or create the service
    ensureService(target, roles[roleArn], callback);
  }
}