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Refactor SOL/EOL real-time detection handler.

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This also implements a generic handler mechanism that can be
reused for other purposes, such as sending email / XMPP notifications,
doing real-time QC checks and so on.

Fixes #113.
This commit is contained in:
D. Berge
2021-05-24 13:48:53 +02:00
parent d40ceb8343
commit 5af89050fb
3 changed files with 170 additions and 47 deletions
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59
lib/www/server/events/index.js
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@@ -1,56 +1,21 @@
const { schema2pid } = require('../lib/db/connection');
const { listen } = require('../ws/db');
const { event } = require('../lib/db');
const channels = require('../lib/db/channels');
const handlers = require('./handlers').init();
function start () {
let prevPos = null;
listen(["realtime"], function (data) {
if (!(data.payload && data.payload.new && data.payload.new.meta)) {
console.log("Wrong event", data);
return;
listen(channels, async function (data) {
for (const handler of handlers) {
// NOTE: We are intentionally passing the same instance
// of the data to every handler. This means that earlier
// handlers could, in principle, modify the data to be
// consumed by latter ones, provided that they are
// synchronous (as otherwise, the completion order is
// undefined).
await handler.run(data);
}
const pos = data.payload.new.meta;
if (prevPos) {
if (pos.lineStatus == "online") {
if (prevPos.lineStatus != "online") {
// FIXME TODO Check if there are already FSP, FGSP events for this sequence
// Tag this as FSP/FGSP
const remarks = `SEQ ${pos._sequence}, SOL ${pos.lineName}, BSP: ${(pos.speed*3.6/1.852).toFixed(1)} kt, Water depth: ${Number(pos.waterDepth).toFixed(0)} m.`;
const payload = {
type: "sequence",
sequence: pos._sequence,
point: pos._point,
remarks,
labels: [ "FSP", "FGSP" ]
}
schema2pid(pos._schema).then(projectId => event.post(projectId, payload));
// console.log("post fsp", pos._schema);
}
} else {
if (prevPos.lineStatus == "online") {
// FIXME TODO Check if there are already LSP, LGSP events for this sequence
// Tag this as LSP/LGSP
const remarks = `SEQ ${prevPos._sequence}, EOL ${prevPos.lineName}, BSP: ${(prevPos.speed*3.6/1.852).toFixed(1)} kt, Water depth: ${Number(prevPos.waterDepth).toFixed(0)} m.`;
const payload = {
type: "sequence",
sequence: prevPos._sequence,
point: prevPos._point,
remarks,
labels: [ "LSP", "LGSP" ]
}
schema2pid(prevPos._schema).then(projectId => event.post(projectId, payload));
// console.log("post lsp", prevPos._schema);
}
}
}
prevPos = JSON.parse(JSON.stringify(pos));
});
console.log("Events manager started");
console.log("Events manager started.", handlers.length, "active handlers");
}
module.exports = { start }