Close!
This commit is contained in:
parent
0ed40d35c2
commit
f0efe75ece
GPG key ID:
5B2020A0F9921EF4
3 changed files with 444 additions and 36 deletions
454
6.ts
454
6.ts
|
|
@ -1,19 +1,24 @@
|
|||
import { BufReader } from "https://deno.land/std@0.157.0/io/buffer.ts";
|
||||
import { ByteSet, LengthType } from "https://deno.land/x/bytes@1.0.3/mod.ts";
|
||||
|
||||
const PORT = 5588;
|
||||
|
||||
type Road = number;
|
||||
type Dispatcher = Road[];
|
||||
type Location = number;
|
||||
type SpeedLimit = number;
|
||||
type Timestamp = number;
|
||||
type Plate = string;
|
||||
type Car = Plate;
|
||||
|
||||
type U8 = number;
|
||||
type U16 = number;
|
||||
type U32 = number;
|
||||
|
||||
type Deciseconds = U32;
|
||||
type Location = U16;
|
||||
type Plate = string;
|
||||
|
||||
type Road = U16;
|
||||
type Mile = U16;
|
||||
|
||||
type SpeedLimit = U16;
|
||||
type SpeedMPH100 = U16;
|
||||
type Timestamp = U32;
|
||||
|
||||
interface Camera {
|
||||
road: Road;
|
||||
location: Location;
|
||||
|
|
@ -26,53 +31,444 @@ interface Report {
|
|||
timestamp: Timestamp;
|
||||
}
|
||||
|
||||
// const tEnc = new TextEncoder();
|
||||
const tEnc = new TextEncoder();
|
||||
const tDec = new TextDecoder();
|
||||
|
||||
console.log(`Starting TCP listener on on 0.0.0.0:${PORT}`);
|
||||
|
||||
function chatSession(conn: Deno.Conn) {
|
||||
const closeOnDisconnect = () => {
|
||||
console.warn("Disconnected client");
|
||||
try {
|
||||
conn.close();
|
||||
} catch (err) {
|
||||
console.error("Error closing client connection:", err);
|
||||
}
|
||||
};
|
||||
|
||||
serve(conn).catch((e) => e).finally(closeOnDisconnect);
|
||||
function session(conn: Deno.Conn) {
|
||||
serve(conn).catch((e) => console.error("Exception during session:", e))
|
||||
.finally(() => disconnect(conn));
|
||||
}
|
||||
|
||||
enum MessageType {
|
||||
ERROR = 0x10, // Server -> Client
|
||||
PLATE = 0x20, // Client -> Server
|
||||
TICKET = 0x21, // Server -> Client
|
||||
WANT_HEARTBEAT = 0x40, // Client -> Server
|
||||
HEARTBEAT = 0x41, // Server -> Client
|
||||
I_AM_CAMERA = 0x80, // Client -> Server
|
||||
I_AM_DISPATCHER = 0x81, // Client -> Server
|
||||
}
|
||||
|
||||
console.log("Message Types:", MessageType);
|
||||
|
||||
type ErrorMessage = [
|
||||
string, // msg
|
||||
];
|
||||
|
||||
type PlateMessage = [
|
||||
string, // plate
|
||||
U32, // timestamp
|
||||
Plate,
|
||||
Timestamp,
|
||||
];
|
||||
|
||||
interface TicketMessage {
|
||||
type TicketMessage = [
|
||||
Plate, // plate
|
||||
Road, // road
|
||||
Mile, // mile1
|
||||
Timestamp, // timestamp1
|
||||
Mile, // mile2
|
||||
Timestamp, // timestamp2
|
||||
SpeedMPH100, // speed
|
||||
];
|
||||
|
||||
type WantHeartbeatMessage = [
|
||||
Deciseconds,
|
||||
];
|
||||
|
||||
type HeartbeatMessage = [];
|
||||
|
||||
type IAmCameraMessage = [
|
||||
Road,
|
||||
Mile,
|
||||
SpeedLimit,
|
||||
];
|
||||
|
||||
type IAmDispatcherMessage = [
|
||||
Road[],
|
||||
];
|
||||
|
||||
type Message =
|
||||
| ErrorMessage
|
||||
| PlateMessage
|
||||
| TicketMessage
|
||||
| WantHeartbeatMessage
|
||||
| HeartbeatMessage
|
||||
| IAmCameraMessage
|
||||
| IAmDispatcherMessage;
|
||||
|
||||
async function readU16(reader: BufReader): Promise<U16> {
|
||||
const buf = await reader.readFull(new Uint8Array(2));
|
||||
if (!buf) throw `unable to fill buffer of length 2 with U32 bytes`;
|
||||
return ByteSet.from(buf, "big").read.uint16();
|
||||
}
|
||||
|
||||
type Message = ErrorMessage | PlateMessage;
|
||||
async function readU32(reader: BufReader): Promise<U32> {
|
||||
const buf = await reader.readFull(new Uint8Array(4));
|
||||
if (!buf) throw `unable to fill buffer of length 4 with U32 bytes`;
|
||||
return ByteSet.from(buf, "big").read.uint32();
|
||||
}
|
||||
|
||||
async function readString(reader: BufReader): Promise<string> {
|
||||
const len = await reader.readByte();
|
||||
if (!len) throw "unable to read string length byte";
|
||||
const buf = await reader.readFull(new Uint8Array(len));
|
||||
if (!buf) throw `unable to fill buffer of length ${len} with string bytes`;
|
||||
return tDec.decode(buf);
|
||||
}
|
||||
|
||||
async function readArray<T>(
|
||||
reader: BufReader,
|
||||
readCallback: (r: BufReader) => Promise<T>,
|
||||
): Promise<T[]> {
|
||||
const len = await reader.readByte();
|
||||
if (!len) throw "unable to read array length byte";
|
||||
const result = [];
|
||||
while (result.length < len) {
|
||||
result.push(await readCallback(reader));
|
||||
}
|
||||
if (result.length != len) {
|
||||
throw new Error(
|
||||
`unable to read array of length ${len} (got ${result.length})`,
|
||||
);
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
async function seqRead<T extends Message>(
|
||||
reader: BufReader,
|
||||
seq: ((r: BufReader) => Promise<T[keyof T]>)[],
|
||||
): Promise<T> {
|
||||
const result = [];
|
||||
for (const f of seq) {
|
||||
result.push(await f(reader));
|
||||
}
|
||||
return result as T; // TODO: cheating
|
||||
}
|
||||
|
||||
async function readError(reader: BufReader): Promise<ErrorMessage> {
|
||||
return await seqRead(reader, [readString]);
|
||||
}
|
||||
|
||||
async function readPlate(reader: BufReader): Promise<PlateMessage> {
|
||||
return await seqRead(reader, [readString, readU32]);
|
||||
}
|
||||
|
||||
async function readTicket(reader: BufReader): Promise<TicketMessage> {
|
||||
return await seqRead(reader, [
|
||||
readString,
|
||||
readU16,
|
||||
readU16,
|
||||
readU32,
|
||||
readU16,
|
||||
readU32,
|
||||
readU16,
|
||||
]);
|
||||
}
|
||||
|
||||
async function readWantHeartbeat(
|
||||
reader: BufReader,
|
||||
): Promise<WantHeartbeatMessage> {
|
||||
return await seqRead(reader, [readU32]);
|
||||
}
|
||||
|
||||
async function readIAmCamera(reader: BufReader): Promise<IAmCameraMessage> {
|
||||
return await seqRead(reader, [readU16, readU16, readU16]);
|
||||
}
|
||||
|
||||
async function readMessage(
|
||||
reader: BufReader,
|
||||
): Promise<{ type: MessageType; message: Message }> {
|
||||
const type = await reader.readByte();
|
||||
if (!type) throw new Error("Failed to read message type byte");
|
||||
let message: Message | null = null;
|
||||
switch (type) {
|
||||
case MessageType.ERROR:
|
||||
message = await readError(reader);
|
||||
break;
|
||||
case MessageType.PLATE:
|
||||
message = await readPlate(reader);
|
||||
break;
|
||||
case MessageType.TICKET:
|
||||
message = await readTicket(reader);
|
||||
break;
|
||||
case MessageType.WANT_HEARTBEAT:
|
||||
message = await readWantHeartbeat(reader);
|
||||
break;
|
||||
case MessageType.HEARTBEAT:
|
||||
message = [];
|
||||
break;
|
||||
case MessageType.I_AM_CAMERA:
|
||||
message = await readIAmCamera(reader);
|
||||
break;
|
||||
case MessageType.I_AM_DISPATCHER:
|
||||
message = [await readArray(reader, readU16)];
|
||||
break;
|
||||
default:
|
||||
throw new Error(`failed to read message of type 0x${type.toString(16)}`);
|
||||
}
|
||||
return { type, message };
|
||||
}
|
||||
|
||||
function dayOfTime(ts: Timestamp): number {
|
||||
return Math.floor(ts / 86400);
|
||||
}
|
||||
|
||||
const intervals = new Map<Deno.Conn, number>();
|
||||
const cameras = new Map<Deno.Conn, Camera>();
|
||||
const dispatchers = new Map<Deno.Conn, Road[]>();
|
||||
const observations = new Map<Plate, Map<Road, Map<Location, Timestamp>>>();
|
||||
const unsentTickets: TicketMessage[] = [];
|
||||
const dispatchedTicketDays = new Map<Plate, Set<number>>();
|
||||
|
||||
function makeObservation(
|
||||
plate: Plate,
|
||||
road: Road,
|
||||
location: Location,
|
||||
when: Timestamp,
|
||||
speedLimit: SpeedLimit,
|
||||
) {
|
||||
let forPlate = observations.get(plate);
|
||||
if (!forPlate) {
|
||||
const newForPlate = new Map<Road, Map<Location, Timestamp>>();
|
||||
observations.set(plate, newForPlate);
|
||||
forPlate = newForPlate;
|
||||
}
|
||||
let forRoad = forPlate.get(road);
|
||||
if (!forRoad) {
|
||||
const newForRoad = new Map<Location, Timestamp>();
|
||||
forPlate.set(road, newForRoad);
|
||||
forRoad = newForRoad;
|
||||
}
|
||||
|
||||
for (const [loc, ts] of forRoad.entries()) {
|
||||
const distMiles = Math.abs(location - loc);
|
||||
const deltaSecs = Math.abs(ts - when);
|
||||
const speed = distMiles / (deltaSecs / 60 / 60);
|
||||
console.log("Diff:", {
|
||||
plate,
|
||||
road,
|
||||
loc,
|
||||
ts,
|
||||
location,
|
||||
when,
|
||||
distMiles,
|
||||
deltaSecs,
|
||||
speed,
|
||||
speedLimit,
|
||||
day: dayOfTime(when),
|
||||
});
|
||||
if (speed > speedLimit + 0.5) {
|
||||
let [m1, t1] = [loc, ts];
|
||||
let [m2, t2] = [location, when];
|
||||
if (when < ts) {
|
||||
[m2, t2] = [loc, ts];
|
||||
[m1, t1] = [location, when];
|
||||
}
|
||||
|
||||
// for now, we will send one ticket per observation - should work, given the constraints
|
||||
dispatchTicket([
|
||||
plate,
|
||||
road,
|
||||
m1,
|
||||
t1,
|
||||
m2,
|
||||
t2,
|
||||
Math.floor(speed * 100),
|
||||
]);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
console.log("Observation:", { plate, road, location, when });
|
||||
|
||||
forRoad.set(location, when);
|
||||
}
|
||||
|
||||
function handleMessage(
|
||||
conn: Deno.Conn,
|
||||
type: MessageType,
|
||||
message: Message,
|
||||
) {
|
||||
console.debug("Message:", {
|
||||
from: conn.remoteAddr,
|
||||
type: MessageType[type.toString()],
|
||||
message,
|
||||
});
|
||||
switch (type) {
|
||||
case MessageType.WANT_HEARTBEAT: {
|
||||
if (intervals.has(conn)) {
|
||||
return sendErrorAndDisconnect(conn, "heartbeat already specified");
|
||||
}
|
||||
const [interval] = (message as WantHeartbeatMessage);
|
||||
setIntervalFor(conn, interval);
|
||||
break;
|
||||
}
|
||||
case MessageType.PLATE: {
|
||||
const cam = cameras.get(conn);
|
||||
if (!cam) return sendErrorAndDisconnect(conn, "not a camera");
|
||||
const [plate, when] = (message as PlateMessage);
|
||||
makeObservation(plate, cam.road, cam.location, when, cam.speedLimit);
|
||||
break;
|
||||
}
|
||||
case MessageType.I_AM_CAMERA: {
|
||||
if (cameras.has(conn) || dispatchers.has(conn)) {
|
||||
sendErrorAndDisconnect(conn, "already identified");
|
||||
}
|
||||
const [road, location, speedLimit] = (message as IAmCameraMessage);
|
||||
const camera: Camera = {
|
||||
road,
|
||||
location,
|
||||
speedLimit,
|
||||
};
|
||||
cameras.set(conn, camera);
|
||||
break;
|
||||
}
|
||||
case MessageType.I_AM_DISPATCHER: {
|
||||
if (cameras.has(conn) || dispatchers.has(conn)) {
|
||||
sendErrorAndDisconnect(conn, "already identified");
|
||||
}
|
||||
const [roads] = (message as IAmDispatcherMessage);
|
||||
dispatchers.set(conn, roads);
|
||||
for (let i = unsentTickets.length - 1; i >= 0; i--) {
|
||||
const t = unsentTickets[i];
|
||||
const [_, road] = t;
|
||||
if (roads.includes(road)) {
|
||||
unsentTickets.splice(i, 1);
|
||||
sendTicket(conn, t);
|
||||
}
|
||||
}
|
||||
break;
|
||||
}
|
||||
default:
|
||||
console.warn("Unable to handle unknown message:", {
|
||||
from: conn.remoteAddr,
|
||||
type: MessageType[type.toString()],
|
||||
message,
|
||||
});
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
function markPlateDay(plate: Plate, day: number) {
|
||||
let forTicketDay = dispatchedTicketDays.get(plate);
|
||||
if (!forTicketDay) {
|
||||
const newForTicketDay = new Set<number>();
|
||||
dispatchedTicketDays.set(plate, newForTicketDay);
|
||||
forTicketDay = newForTicketDay;
|
||||
}
|
||||
forTicketDay.add(day);
|
||||
}
|
||||
|
||||
function hasPlateDay(plate: Plate, day: number): boolean {
|
||||
return !!(dispatchedTicketDays.get(plate)?.has(day));
|
||||
}
|
||||
|
||||
function dispatchTicket(t: TicketMessage) {
|
||||
let [plate, road, mile1, ts1, mile2, ts2, speed] = t;
|
||||
let day1 = dayOfTime(ts1);
|
||||
const day2 = dayOfTime(ts2);
|
||||
|
||||
while (day1 < day2) {
|
||||
const nts1 = Math.max(ts1, day1 * 86400);
|
||||
const nts2 = Math.min(((day1 + 1) * 86400) - 1, ts2);
|
||||
console.log("Multi-day ticket:", day1, day2, nts1, nts2);
|
||||
day1++;
|
||||
ts1 = nts2 + 1;
|
||||
dispatchTicket([plate, road, mile1, nts1, mile2, nts2, speed]);
|
||||
}
|
||||
|
||||
if (hasPlateDay(plate, day1)) {
|
||||
return;
|
||||
}
|
||||
markPlateDay(plate, day1);
|
||||
|
||||
let sent = false;
|
||||
for (const [conn, roads] of dispatchers.entries()) {
|
||||
if (roads.includes(road)) {
|
||||
sent = true;
|
||||
sendTicket(conn, t);
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (!sent) unsentTickets.push(t);
|
||||
}
|
||||
|
||||
async function sendTicket(conn: Deno.Conn, t: TicketMessage) {
|
||||
const [plate, road, m1, t1, m2, t2, speed] = t;
|
||||
console.log("Sending ticket:", t);
|
||||
const plateBytes = tEnc.encode(plate);
|
||||
|
||||
const p = new ByteSet(
|
||||
1 + 1 + plateBytes.length + 2 + 2 + 4 + 2 + 4 + 2,
|
||||
"big",
|
||||
);
|
||||
p.write.uint8(MessageType.TICKET);
|
||||
// p.write.uint8(plateBytes.length);
|
||||
p.write.uint8Array(plateBytes, LengthType.Uint8);
|
||||
p.write.uint16(road);
|
||||
p.write.uint16(m1);
|
||||
p.write.uint32(t1);
|
||||
p.write.uint16(m2);
|
||||
p.write.uint32(t2);
|
||||
p.write.uint16(speed);
|
||||
await conn.write(p.buffer);
|
||||
}
|
||||
|
||||
async function serve(conn: Deno.Conn) {
|
||||
const reader = new BufReader(conn);
|
||||
const type = await reader.peek(1);
|
||||
if (!type) throw new Error("failed to peek start of packet");
|
||||
console.log({ type }, 0x64);
|
||||
// TODO: loop...
|
||||
try {
|
||||
while (true) {
|
||||
const { type: type, message } = await readMessage(reader);
|
||||
handleMessage(conn, type, message);
|
||||
}
|
||||
} finally {
|
||||
clearIntervalFor(conn);
|
||||
}
|
||||
}
|
||||
|
||||
function disconnect(conn: Deno.Conn) {
|
||||
console.log("Disconnecting:", conn.remoteAddr);
|
||||
try {
|
||||
conn.close();
|
||||
} catch (_) {
|
||||
console.debug("Failed to close connection (probably already closed)");
|
||||
}
|
||||
clearIntervalFor(conn);
|
||||
cameras.delete(conn);
|
||||
dispatchers.delete(conn);
|
||||
}
|
||||
|
||||
async function sendErrorAndDisconnect(conn: Deno.Conn, msg: string) {
|
||||
console.warn("Sending error:", msg);
|
||||
await conn.write(new Uint8Array([MessageType.ERROR]));
|
||||
await conn.write(tEnc.encode(msg));
|
||||
disconnect(conn);
|
||||
}
|
||||
|
||||
function setIntervalFor(conn: Deno.Conn, intervalDeciseconds: number) {
|
||||
if (intervalDeciseconds <= 0) return;
|
||||
|
||||
intervals.set(
|
||||
conn,
|
||||
setInterval(() => {
|
||||
try {
|
||||
conn.write(new Uint8Array([MessageType.HEARTBEAT]));
|
||||
} catch {
|
||||
clearIntervalFor(conn);
|
||||
}
|
||||
}, intervalDeciseconds * 100 /* deciseconds to ms */),
|
||||
);
|
||||
}
|
||||
|
||||
function clearIntervalFor(conn: Deno.Conn) {
|
||||
if (intervals.has(conn)) {
|
||||
clearInterval(intervals.get(conn));
|
||||
intervals.delete(conn);
|
||||
}
|
||||
}
|
||||
|
||||
for await (const conn of Deno.listen({ port: PORT })) {
|
||||
console.log("Connection established:", conn.remoteAddr);
|
||||
chatSession(conn);
|
||||
console.log("Connection closed:", conn.remoteAddr);
|
||||
session(conn);
|
||||
}
|
||||
|
|
|
|||
18
deno.lock
Normal file
18
deno.lock
Normal file
|
|
@ -0,0 +1,18 @@
|
|||
{
|
||||
"version": "2",
|
||||
"remote": {
|
||||
"https://deno.land/std@0.157.0/_util/assert.ts": "e94f2eb37cebd7f199952e242c77654e43333c1ac4c5c700e929ea3aa5489f74",
|
||||
"https://deno.land/std@0.157.0/bytes/bytes_list.ts": "aba5e2369e77d426b10af1de0dcc4531acecec27f9b9056f4f7bfbf8ac147ab4",
|
||||
"https://deno.land/std@0.157.0/bytes/equals.ts": "3c3558c3ae85526f84510aa2b48ab2ad7bdd899e2e0f5b7a8ffc85acb3a6043a",
|
||||
"https://deno.land/std@0.157.0/bytes/mod.ts": "763f97d33051cc3f28af1a688dfe2830841192a9fea0cbaa55f927b49d49d0bf",
|
||||
"https://deno.land/std@0.157.0/io/buffer.ts": "fae02290f52301c4e0188670e730cd902f9307fb732d79c4aa14ebdc82497289",
|
||||
"https://deno.land/std@0.157.0/io/types.d.ts": "0cae3a62da7a37043661746c65c021058bae020b54e50c0e774916e5d4baee43",
|
||||
"https://deno.land/x/bytes@1.0.3/mod.ts": "0df9e698738399cb6ab2ceaff1d64d45e1581d62c900e3cc6664d75556288fb8",
|
||||
"https://deno.land/x/bytes@1.0.3/src/bitarray/BitArray.ts": "0b3ad2f03aee0bc5f1f047714e83fec43e9ccbab32b4113cb61925ac80fec62d",
|
||||
"https://deno.land/x/bytes@1.0.3/src/bitarray/Read.ts": "f8e721c984a7297025de9406304cf96cf9778f999fa6ed064dfee5f3d4f9800d",
|
||||
"https://deno.land/x/bytes@1.0.3/src/bitarray/Write.ts": "2ef36768c7d47b00e9100507452ce8ce9b14912bc0f1059926a022a719de7d9c",
|
||||
"https://deno.land/x/bytes@1.0.3/src/byteset/ByteSet.ts": "9b7306cb12852cfaf6340378a87c9e5b33eba6de8c3d4c05ddc411bb3da2743c",
|
||||
"https://deno.land/x/bytes@1.0.3/src/byteset/Read.ts": "761966c30456c6cc5b4a52c7e154139033b03e6b14c8cecea88f68ad3f0c2b66",
|
||||
"https://deno.land/x/bytes@1.0.3/src/byteset/Write.ts": "9ec31b39bc1306960f70486e3e898cc38902f2ce3ba338912e1acdee6867b97e"
|
||||
}
|
||||
}
|
||||
|
|
@ -10,13 +10,7 @@ the `std` modules available to do as much as possible in a very asynchronous
|
|||
|
||||
[Install Deno][deno#install]
|
||||
|
||||
# Usage
|
||||
|
||||
```bash
|
||||
deno run -A --unstable N.ts
|
||||
```
|
||||
|
||||
## Example
|
||||
# Example Usage
|
||||
|
||||
```bash
|
||||
deno run -A --unstable 0.ts
|
||||
|
|
|
|||
Loading…
Reference in a new issue