Question

当我致电pdfCreate时，会加载一个事件，这很正常。

然后从包含的服务中调用createIncidentReport，这可以正常工作。

将PDF写入磁盘后调用

pdfStream.on('finish')，这在控制台上运行正常。写入日志，但不调用邮件服务。我该如何解决这个承诺？

function pdfCreate(incidentId) {
        Incident.findById(incidentId)
            .then(incident => pdfService.createIncidentReport(incident))
            .then(() => mailservice.sendPdfCreatedMail(incident));
    }   

     function createIncidentReport(incident, res) {
            return new Promise((resolve, reject) => {
                     let pdfStream = fs.createWriteStream(settings.PDF.DIRECTORY + incident.id + '.pdf');
                     incidentReport.pipe(pdfStream);
                     pdfStream.on('finish', function () {
                         console.log('finished writing pdf')
                         resolve();
                     });
            }
        }

    function sendPdfCreatedMail(incident) {
        console.log('mail');
        let message = {
            to: incident.reporter.email,
            subject: 'Incident completed',
            text: 'Incident has been completed.',
            html: 'Incident has been completed.'
        };

        sendMessage(message);

    }

Answer 1

好的，我找到了答案。

 .then(() => mailservice.sendPdfCreatedMail(incident));

期待一个事件，我的决心没有通过它，因此函数没有解决，因为缺少参数。

通过这样做解决了这个问题：

resolve(incident);

.then(incident => mailservice.sendPdfCreatedMail(incident));

promis中的Nodejs事件无法解决

1 个答案: