mirror of
https://github.com/cesanta/mongoose.git
synced 2025-08-06 05:26:15 +08:00
Change device dashboard to use MQTT
This commit is contained in:
Sergey Lyubka
parent
f4fa1e097d
commit
219428c249
@ -1,5 +1,5 @@
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PROG ?= example
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SOURCES ?= ../../mongoose.c main.c web.c packed_fs.c
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SOURCES ?= ../../mongoose.c main.c net.c packed_fs.c
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CFLAGS ?= -I../.. -DMG_ENABLE_PACKED_FS=1 $(EXTRA)
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FILES_TO_EMBED ?= $(wildcard web_root/*)
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ROOT ?= $(realpath $(CURDIR)/../../..)
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@ -3,6 +3,10 @@
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#include "mongoose.h"
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#define MQTT_SERVER "mqtt://broker.hivemq.com:1883"
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#define MQTT_PUBLISH_TOPIC "mg/my_device"
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#define MQTT_SUBSCRIBE_TOPIC "mg/#"
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// Authenticated user.
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// A user can be authenticated by:
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// - a name:pass pair
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@ -17,25 +21,18 @@ struct user {
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// This is a configuration structure we're going to show on a dashboard
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static struct config {
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int value1;
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char *value2;
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} s_config = {123, NULL};
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char *url, *pub, *sub; // MQTT settings
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} s_config;
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// Update config structure. Return true if changed, false otherwise
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static bool update_config(struct mg_http_message *hm, struct config *cfg) {
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bool changed = false;
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static struct mg_connection *s_mqtt = NULL; // MQTT connection
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// Try to update a single configuration value
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static void update_config(struct mg_str *body, const char *name, char **value) {
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char buf[256];
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if (mg_http_get_var(&hm->body, "value1", buf, sizeof(buf)) > 0) {
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cfg->value1 = atoi(buf);
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changed = true;
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if (mg_http_get_var(body, name, buf, sizeof(buf)) > 0) {
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free(*value);
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*value = strdup(buf);
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}
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if (mg_http_get_var(&hm->body, "value2", buf, sizeof(buf)) > 0) {
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free(cfg->value2);
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cfg->value2 = malloc(strlen(buf) + 1);
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strcpy(cfg->value2, buf);
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changed = true;
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}
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return changed;
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}
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// Parse HTTP requests, return authenticated user or NULL
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@ -75,7 +72,7 @@ static void send_notification(struct mg_mgr *mgr, const char *name,
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}
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// Send simulated metrics data to the dashboard, for chart rendering
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static void timer_func(void *param) {
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static void timer_metrics_fn(void *param) {
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char buf[50];
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mg_snprintf(buf, sizeof(buf), "[ %lu, %d ]", (unsigned long) time(NULL),
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10 + (int) ((double) rand() * 10 / RAND_MAX));
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@ -83,11 +80,41 @@ static void timer_func(void *param) {
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send_notification(param, "metrics", buf);
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}
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// MQTT event handler function
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static void mqtt_fn(struct mg_connection *c, int ev, void *evd, void *fnd) {
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if (ev == MG_EV_MQTT_OPEN) {
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struct mg_str topic = mg_str(s_config.pub);
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mg_mqtt_sub(s_mqtt, &topic, 1);
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} else if (ev == MG_EV_MQTT_MSG) {
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struct mg_mqtt_message *mm = evd;
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char buf[256];
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snprintf(buf, sizeof(buf), "{\"topic\":\"%.*s\",\"data\":\"%.*s\"}",
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(int) mm->topic.len, mm->topic.ptr, (int) mm->data.len,
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mm->data.ptr);
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send_notification(param, "message", buf);
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} else if (ev == MG_EV_CLOSE) {
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s_mqtt = NULL;
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}
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}
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// Keep MQTT connection open - reconnect if closed
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static void timer_metrics_fn(void *param) {
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struct mg_mgr *mgr = (struct mg_mgr *) param;
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if (s_mqtt == NULL) {
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struct mg_mqtt_opts opts = {};
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s_mqtt = mg_mqtt_connect(mgr, s_config.rl, &opts, mqtt_fn, NULL);
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}
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}
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// HTTP request handler function
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void device_dashboard_fn(struct mg_connection *c, int ev, void *ev_data,
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void *fn_data) {
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if (ev == MG_EV_OPEN && c->is_listening) {
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mg_timer_add(c->mgr, 1000, MG_TIMER_REPEAT, timer_func, c->mgr);
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mg_timer_add(c->mgr, 1000, MG_TIMER_REPEAT, timer_metrics_fn, c->mgr);
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mg_timer_add(c->mgr, 1000, MG_TIMER_REPEAT, timer_mqtt_fn, c->mgr);
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s_config.url = strdup(MQTT_SERVER);
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s_config.pub = strdup(MQTT_PUBLISH_TOPIC);
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s_config.sub = strdup(MQTT_SUBSCRIBE_TOPIC);
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} else if (ev == MG_EV_HTTP_MSG) {
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struct mg_http_message *hm = (struct mg_http_message *) ev_data;
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struct user *u = getuser(hm);
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@ -100,14 +127,16 @@ void device_dashboard_fn(struct mg_connection *c, int ev, void *ev_data,
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mg_printf(c, "%s", "HTTP/1.1 403 Denied\r\nContent-Length: 0\r\n\r\n");
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} else if (mg_http_match_uri(hm, "/api/config/get")) {
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mg_printf(c, "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n");
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mg_http_printf_chunk(c, "{\"%s\":%d,\"%s\":\"%s\"}", "value1",
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s_config.value1, "value2", s_config.value2);
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mg_http_printf_chunk(c, "{\"url\":\"%s\",\"pub\":\"%s\",\"sub\":\"%s\"}",
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s_config.url, s_config.pub, s_config.sub);
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mg_http_printf_chunk(c, "");
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} else if (mg_http_match_uri(hm, "/api/config/set")) {
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// Admins only
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if (strcmp(u->name, "admin") == 0) {
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if (update_config(hm, &s_config))
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send_notification(fn_data, "config", "null");
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update_config(&hm->body, "url", &s_config.url);
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update_config(&hm->body, "pub", &s_config.pub);
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update_config(&hm->body, "sub", &s_config.sub);
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send_notification(fn_data, "config", "null");
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mg_printf(c, "HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n");
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} else {
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mg_printf(c, "%s", "HTTP/1.1 403 Denied\r\nContent-Length: 0\r\n\r\n");
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File diff suppressed because it is too large
Load Diff
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File diff suppressed because one or more lines are too long
@ -5,10 +5,8 @@
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<meta charset="utf-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<link rel="stylesheet" href="chartist.min.css" />
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<link rel="stylesheet" href="style.css" />
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</head>
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<body></body>
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<script src="chartist.min.js"></script>
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<script type="module" src="main.js"></script>
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</html>
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@ -1,6 +1,8 @@
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'use strict';
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import {Component, h, html, render, useEffect, useState, useRef} from './preact.min.js';
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const MaxMetricsDataPoints = 50;
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const Nav = props => html`
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<div style="background: #333; padding: 0.5em; color: #fff;">
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<div class="container d-flex">
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@ -28,93 +30,77 @@ const Hero = props => html`
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<div style="margin-top: 1em; background: #eee; padding: 1em; border-radius: 0.5em; color: #777; ">
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<h1 style="margin: 0.2em 0;">Interactive Device Dashboard</h1>
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<p>
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This device dashboard is developed with modern and compact Preact framework,
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in order to fit on a very small devices. This is
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a <a href="https://mongoose.ws/tutorials/http-server/">hybrid server</a> which
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provides both static and dynamic content. Static files, like CSS/JS/HTML
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or images, are compiled into the server binary. Dynamic content is
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served via the REST API.
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or images, are compiled into the server binary.
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This dashboard shows values kept in server memory. Many clients can open
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this page. The JS code that watches state changes, reconnects on network
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failures. That means if server restarts, dashboard on all connected clients
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refresh automatically.
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NOTE: administrators can change settings values, whilst users cannot.
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<p>
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This UI uses the REST API implemented by the server, which you can examine
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This UI uses the REST API implemented by the device, which you can examine
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using <code>curl</code> command-line utility:
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</p>
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<div><code>curl localhost:8000/api/config/get</code> - get current device configuration</div>
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<div><code>curl localhost:8000/api/config/set -d 'value1=7&value2=hello'</code> - set device configuration</div>
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<div><code>curl localhost:8000/api/message/send -d 'msg=hello'</code> - send chat message</div>
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<div><code>curl localhost:8000/api/watch</code> - get notifications: chat, config, metrics</div>
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<div><code>curl localhost:8000/api/message/send -d 'msg=hello'</code> - send MQTT message</div>
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<div><code>curl localhost:8000/api/watch</code> - get notifications: MQTT messages, configuration, sensor data</div>
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</div>`;
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const ShowSettings = function(props) {
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return html`
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<div style="margin: 0 0.3em;">
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<h3 style="background: #59d; color: #fff;padding: 0.4em;">Device configuration</h3>
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<div style="margin: 0.5em 0;">
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<span class="addon">value1:</span>
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<input disabled type="text" class="smooth"
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value=${(props.config || {}).value1 || ''} />
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</div>
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<div style="margin: 0.5em 0;">
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<span class="addon">value2:</span>
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<input disabled type="text" class="smooth"
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value=${(props.config || {}).value2 || ''} />
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</div>
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<div class="msg">
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Server's corresponding runtime configuration structure:
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<pre>
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struct config {
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int value1;
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char *value2;
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} s_config;
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</pre>
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</div>
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</div>`;
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};
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const ChangeSettings = function(props) {
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const [value1, setValue1] = useState('');
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const [value2, setValue2] = useState('');
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const Configuration = function(props) {
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const [url, setUrl] = useState('');
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const [pub, setPub] = useState('');
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const [sub, setSub] = useState('');
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useEffect(() => {
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setValue1(props.config.value1);
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setValue2(props.config.value2);
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}, [props.config.value1, props.config.value2])
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setUrl(props.config.url);
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setPub(props.config.pub);
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setSub(props.config.sub);
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}, [props.config.url, props.config.pub, props.config.sub])
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const update = (name, val) => fetch('/api/config/set', {
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method: 'post',
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body: `${name}=${encodeURIComponent(val)}`
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}).catch(err => err);
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const updatevalue1 = ev => update('value1', value1);
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const updatevalue2 = ev => update('value2', value2);
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const updateurl = ev => update('url', url);
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const updatepub = ev => update('pub', pub);
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const updatesub = ev => update('sub', sub);
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return html`
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<div style="margin: 0 0.3em;">
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<h3 style="background: #c03434; color: #fff; padding: 0.4em;">
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Change configuration</h3>
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<div style="margin: 0.5em 0;">
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<span class="addon">value1:</span>
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<input type="text" value=${value1} onchange=${updatevalue1}
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oninput=${ev => setValue1(ev.target.value)} />
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<button class="btn" disabled=${!value1} onclick=${updatevalue1}
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Device Configuration</h3>
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<div style="margin: 0.5em 0; display: flex;">
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<span class="addon nowrap">MQTT server:</span>
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<input type="text" style="flex: 1 100%;"
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value=${url} onchange=${updateurl}
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oninput=${ev => setUrl(ev.target.value)} />
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<button class="btn" disabled=${!url} onclick=${updateurl}
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style="margin-left: 1em; background: #8aa;">Update</button>
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</div>
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<div style="margin: 0.5em 0;">
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<span class="addon">value2:</span>
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<input type="text" value=${value2} onchange=${updatevalue2}
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oninput=${ev => setValue2(ev.target.value)} />
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<button class="btn" disabled=${!value2} onclick=${updatevalue2}
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<div style="margin: 0.5em 0; display: flex; ">
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<span class="addon nowrap">Subscribe topic:</span>
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<input type="text" style="flex: 1 100%;"
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value=${sub} onchange=${updatesub}
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oninput=${ev => setSub(ev.target.value)} />
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<button class="btn" disabled=${!sub} onclick=${updatesub}
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style="margin-left: 1em; background: #8aa;">Update</button>
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</div>
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<div style="margin: 0.5em 0; display: flex;">
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<span class="addon nowrap">Publish topic:</span>
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<input type="text" style="flex: 1 100%;"
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value=${pub} onchange=${updatepub}
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oninput=${ev => setPub(ev.target.value)} />
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<button class="btn" disabled=${!pub} onclick=${updatepub}
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style="margin-left: 1em; background: #8aa;">Update</button>
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</div>
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<div class="msg">
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As soon as administrator updates configuration,
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server iterates over all connected clients and sends update
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notifications to all of them - so they update automatically.
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Device keeps a persistent connection to the configured MQTT server.
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Changes to this configuration are propagated to all dashboards: try
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changing them in this dashboard and observe changes in the other opened
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dashboard.
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</div><div class="msg">
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Note: administrators can see this section and can change device
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configuration, whilst users cannot.
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</div>
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</div>`;
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};
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@ -155,7 +141,7 @@ const Login = function(props) {
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const Message = text => html`<div style="margin: 0.5em 0;">${text}</div>`;
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const Chat = function(props) {
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const Messages = function(props) {
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const [message, setMessage] = useState('');
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const sendmessage = ev => fetch('/api/message/send', {
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method: 'post',
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@ -166,40 +152,105 @@ const Chat = function(props) {
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text => html`<div style="margin: 0.5em 0;">${text}</div>`);
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return html`
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<div style="margin: 0 0.3em;">
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<h3 style="background: #30c040; color: #fff; padding: 0.4em;">User chat</h3>
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<h3 style="background: #30c040; color: #fff; padding: 0.4em;">MQTT messages</h3>
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<div style="height: 10em; overflow: auto; padding: 0.5em; " class="border">
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${messages}
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</div>
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<div style="margin: 0.5em 0;">
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<input placeholder="type message..." style="width: 100%" value=${message}
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onchange=${sendmessage}
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<div style="margin: 0.5em 0; display: flex">
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<span class="addon nowrap">Publish message:</span>
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<input placeholder="type and press enter..." style="flex: 1 100%;"
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value=${message} onchange=${sendmessage}
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oninput=${ev => setMessage(ev.target.value)} />
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</div>
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<div class="msg">
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Chat demonsrates
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real-time bidirectional data exchange between many clients and a server.
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Message gets passed to the device via REST. Then a device sends it to
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the MQTT server over MQTT. All MQTT messages on a subscribed topic
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received by a device, are propagated to this dashboard via the
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/api/watch.
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</div>
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</div>`;
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};
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const datefmt = unix => (new Date(unix * 1000)).toISOString().substr(14, 5);
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// Expected arguments:
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// data: timeseries, e.g. [ [1654361352, 19], [1654361353, 18], ... ]
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// width, height, yticks, xticks, ymin, ymax, xmin, xmax
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const SVG = function(props) {
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// w
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// +---------------------+
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// | h1 |
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// | +-----------+ |
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// | | | | h
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// | w1 | | w2 |
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// | +-----------+ |
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// | h2 |
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// +---------------------+
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//
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let w = props.width, h = props.height, w1 = 30, w2 = 0, h1 = 8, h2 = 18;
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let yticks = props.yticks || 4, xticks = props.xticks || 5;
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let data = props.data || [];
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let ymin = props.ymin || 0;
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let ymax = props.ymax || Math.max.apply(null, data.map(p => p[1]));
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let xmin = props.xmin || Math.min.apply(null, data.map(p => p[0]));
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let xmax = props.xmax || Math.max.apply(null, data.map(p => p[0]));
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// Y-axis tick lines and labels
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let yta = (new Array(yticks + 1)).fill(0).map((_, i) => i); // indices
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let yti = i => h - h2 - (h - h1 - h2) * i / yticks; // index's Y
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let ytv = i => (ymax - ymin) * i / yticks;
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let ytl = y => html`<line x1=${w1} y1=${y} x2=${w} y2=${y} class="tick"/>`;
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let ytt = (y, v) => html`<text x=0 y=${y + 5} class="label">${v}</text>`;
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// X-axis tick lines and labels
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let datefmt = unix => (new Date(unix * 1000)).toISOString().substr(14, 5);
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let xta = (new Array(xticks + 1)).fill(0).map((_, i) => i); // indices
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let xti = i => w1 + (w - w1 - w2) * i / xticks; // index's X
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let xtv = i => datefmt(xmin + (xmax - xmin) * i / xticks);
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let xtl = x => html`<path d="M ${x},${h1} L ${x},${h - h2}" class="tick"/>`;
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let xtt = (x, v) =>
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html`<text x=${x - 15} y=${h - 2} class="label">${v}</text>`;
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// Transform data points array into coordinate
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let dx = v => w1 + (v - xmin) / ((xmax - xmin) || 1) * (w - w1 - w2);
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let dy = v => h - h2 - (v - ymin) / ((ymax - ymin) || 1) * (h - h1 - h2);
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let dd = data.map(p => [Math.round(dx(p[0])), Math.round(dy(p[1]))]);
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let ddl = dd.length;
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// And plot the data as <path> element
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let begin0 = ddl ? `M ${dd[0][0]},${dd[0][1]}` : `M 0,0`;
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let begin = `M ${w1},${h - h2}`; // Initial point
|
||||
let end = ddl ? `L ${dd[ddl - 1][0]},${h - h2}` : `L ${w1},${h - h2}`;
|
||||
let series = ddl ? dd.map(p => `L ${p[0]} ${p[1]}`) : [];
|
||||
|
||||
return html`
|
||||
<svg viewBox="0 0 ${w} ${h}">
|
||||
<style>
|
||||
.axis { stroke: #aaa; fill: none; }
|
||||
.label { stroke: #aaa; font-size: 13px; }
|
||||
.tick { stroke: #ccc; fill: none; stroke-dasharray: 5; }
|
||||
.seriesbg { stroke: none; fill: rgba(200,225,255, 0.25)}
|
||||
.series { stroke: #25a; fill: none; }
|
||||
</style>
|
||||
${yta.map(i => ytl(yti(i)))}
|
||||
${yta.map(i => ytt(yti(i), ytv(i)))}
|
||||
${xta.map(i => xtl(xti(i)))}
|
||||
${data.length ? xta.map(i => xtt(xti(i), xtv(i))) : ''}
|
||||
<path d="${begin} ${series.join(' ')} ${end}" class="seriesbg" />
|
||||
<path d="${begin0} ${series.join(' ')}" class="series" />
|
||||
</svg>`;
|
||||
};
|
||||
|
||||
|
||||
const Chart = function(props) {
|
||||
const chartdiv = useRef(null);
|
||||
const refresh = () => {
|
||||
const labels = props.metrics.map(el => datefmt(el[0]));
|
||||
const series = props.metrics.map(el => el[1]);
|
||||
const options = {low: 0, high: 20, showArea: true};
|
||||
// console.log([labels, [series]]);
|
||||
new Chartist.Line(chartdiv.current, {labels, series: [series]}, options);
|
||||
};
|
||||
useEffect(() => {chartdiv && refresh()}, [props.metrics]);
|
||||
|
||||
let xmax = 0, missing = MaxMetricsDataPoints - props.metrics.length;
|
||||
if (missing > 0) xmax = Math.round(Date.now() / 1000) + missing;
|
||||
return html`
|
||||
<div style="margin: 0 0.3em;">
|
||||
<h3 style="background: #ec3; color: #fff; padding: 0.4em;">Data Chart</h3>
|
||||
<div style="height: 14em; overflow: auto; padding: 0.5em; " class="border">
|
||||
<div ref=${chartdiv} style="height: 100%;" />
|
||||
<div style="overflow: auto; padding: 0.5em;" class="">
|
||||
<${SVG} height=240 width=600 ymin=0 ymax=20
|
||||
xmax=${xmax} data=${props.metrics} />
|
||||
</div>
|
||||
<div class="msg">
|
||||
This chart plots live sensor data, sent by a device via /api/watch.
|
||||
</div>
|
||||
</div>`;
|
||||
};
|
||||
@ -235,7 +286,7 @@ const App = function(props) {
|
||||
} else if (msg.name == 'message') {
|
||||
setMessages(m => m.concat([msg.data]));
|
||||
} else if (msg.name == 'metrics') {
|
||||
setMetrics(m => m.concat([msg.data]).splice(-10));
|
||||
setMetrics(m => m.concat([msg.data]).splice(-MaxMetricsDataPoints));
|
||||
}
|
||||
// console.log(msg);
|
||||
if (!result.done) return f(reader);
|
||||
@ -258,16 +309,15 @@ const App = function(props) {
|
||||
|
||||
if (!user) return html`<${Login} login=${login} />`;
|
||||
const admin = user == 'admin';
|
||||
const cs = admin ? html`<${ChangeSettings} config=${config} />` : '';
|
||||
const cs = admin ? html`<${Configuration} config=${config} />` : '';
|
||||
return html`
|
||||
<${Nav} user=${user} logout=${logout} />
|
||||
<div class="container">
|
||||
<${Hero} />
|
||||
<div class="row">
|
||||
<div class="col c6"><${Chart} metrics=${metrics} /></div>
|
||||
<div class="col c6"><${ShowSettings} config=${config} /></div>
|
||||
<div class="col c6"><${Chat} messages=${messages} /></div>
|
||||
<div class="col c6">${cs}</div>
|
||||
<div class="col c6"><${Messages} messages=${messages} /></div>
|
||||
</div>
|
||||
<${Footer} />
|
||||
</div>`;
|
||||
|
||||
@ -4,7 +4,7 @@ select, input, label::before, textarea { outline: none; box-shadow:none !importa
|
||||
code, pre { color: #373; font-family: monospace; font-weight: bolder; font-size: smaller; background: #ddd; padding: 0.1em 0.3em; border-radius: 0.2em; }
|
||||
textarea, input, .addon { font-size: 15px; border: 1px solid #ccc; padding: 0.5em; }
|
||||
a, a:visited, a:active { color: #55f; }
|
||||
.addon { background: #eee; }
|
||||
.addon { background: #eee; min-width: 9em;}
|
||||
.btn {
|
||||
background: #ccc; border-radius: 0.3em; border: 0; color: #fff; cursor: pointer;
|
||||
display: inline-block; padding: 0.6em 2em; font-weight: bolder;
|
||||
@ -16,6 +16,7 @@ a, a:visited, a:active { color: #55f; }
|
||||
.d-none { display: none; }
|
||||
.border { border: 1px solid #ddd; }
|
||||
.rounded { border-radius: 0.5em; }
|
||||
.nowrap { white-space: nowrap; }
|
||||
.msg { background: #def; border-left: 5px solid #59d; padding: 1em; margin: 1em 0; }
|
||||
.row { margin: 1% 0; overflow: auto; }
|
||||
.col { float: left; }
|
||||
|
||||
Loading…
Reference in New Issue
Block a user