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index.js
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index.js
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// index.js - Dapr CNS client
// Copyright 2023 Padi, Inc. All Rights Reserved.
'use strict';
// Imports
const dapr = require('@dapr/dapr');
const env = require('dotenv').config();
const merge = require('object-merge');
require('dotenv').config()
const pack = require('./package.json');
// Errors
const E_CONTEXT = 'no context';
// Defaults
const defaults = {
CNS_CONTEXT: '',
CNS_DAPR: 'cns-dapr',
CNS_DAPR_HOST: 'localhost',
CNS_DAPR_PORT: '3500',
CNS_PUBSUB: 'cns-pubsub',
CNS_SERVER_HOST: 'localhost',
CNS_SERVER_PORT: '3001'
};
// Config
const config = {
CNS_CONTEXT: process.env.CNS_CONTEXT || defaults.CNS_CONTEXT,
CNS_DAPR: process.env.CNS_DAPR || defaults.CNS_DAPR,
CNS_DAPR_HOST: process.env.CNS_DAPR_HOST || defaults.CNS_DAPR_HOST,
CNS_DAPR_PORT: process.env.CNS_DAPR_PORT || defaults.CNS_DAPR_PORT,
CNS_PUBSUB: process.env.CNS_PUBSUB || defaults.CNS_PUBSUB,
CNS_SERVER_HOST: process.env.CNS_SERVER_HOST || defaults.CNS_SERVER_HOST,
CNS_SERVER_PORT: process.env.CNS_SERVER_PORT || defaults.CNS_SERVER_PORT
};
// Dapr client
const client = new dapr.DaprClient({
daprHost: config.CNS_DAPR_HOST,
daprPort: config.CNS_DAPR_PORT,
logger: {
level: dapr.LogLevel.Error
}
});
// Dapr server
const server = new dapr.DaprServer({
serverHost: config.CNS_SERVER_HOST,
serverPort: config.CNS_SERVER_PORT,
clientOptions: {
daprHost: config.CNS_DAPR_HOST,
daprPort: config.CNS_DAPR_PORT
},
logger: {
level: dapr.LogLevel.Error
}
});
// Installers
const KUBE_INSTALLERS = [
'helm',
'kubectl'
];
// Control profile
const KUBE_PROFILE_V1 = 'cp:kubecns.control.v1:provider';
const KUBE_SYNCTIME = 2000;
// Local data
var installers = {};
var connsV1 = {};
var changes = {};
var sync;
// Bind installers
function bindInstallers() {
// Bind each installer
for (const installer of KUBE_INSTALLERS) {
try {
// Bind module
installers[installer] = require('./src/installers/' + installer + '.js');
console.log('CNS Kube supports', installer);
} catch (e) {
// Failure
console.error('Error:', 'failed to bind installer', installer);
console.error(e);
}
}
}
// Add connection
async function connectV1(id) {
// Get connection
const conn = connsV1[id];
if (conn === undefined) {
console.log('Unknown:', id);
return;
}
// Get properties
const properties = conn.properties;
const action = properties.action;
const installer = installers[properties.installer];
console.log('Processing:', id, action);
// Valid installer?
if (installer === undefined) {
console.error('Error:', 'installer not valid');
return;
}
// Get action result
var result;
try {
// What action?
switch (action) {
case 'apply':
// Apply
result = installer.apply(properties);
break;
case 'applied':
// Applied
break;
case 'remove':
// Remove
result = installer.remove(properties);
break;
case 'removed':
// Removed
break;
case 'error':
// Error
break;
default:
// Unknown
throw new Error('unknown action ' + action);
}
} catch (e) {
// Failure
console.error('Error:', 'failed to', action);
console.error(e);
result = {
action: 'error',
status: e.message
};
}
// Has result?
if (result === undefined) return;
try {
// Post action result
const res = await client.invoker.invoke(
config.CNS_DAPR,
'node/contexts/' + config.CNS_CONTEXT + '/capabilities/' + KUBE_PROFILE_V1 + '/connections/' + id + '/properties',
dapr.HttpMethod.POST,
result);
// CNS Dapr error?
if (res.error !== undefined)
throw new Error(res.error);
} catch(e) {
// Failure
console.error('Error:', e.message);
}
}
// Remove connection
async function removeV1(id) {
// Get connection
const conn = connsV1[id];
if (conn === undefined) {
console.log('Unknown:', id);
return;
}
// Remove connection
delete connsV1[id];
// Get properties
const properties = conn.properties;
const action = properties.action;
const installer = installers[properties.installer];
// Not in applied state?
if (action !== 'applied') {
console.log('Skipping:', id, action);
return;
}
console.log('Processing:', id, 'remove');
// Valid installer?
if (installer === undefined) {
console.error('Error:', 'installer not valid');
return;
}
try {
// Try to remove
const result = installer.remove(properties);
console.log('Removed:', result.status);
} catch (e) {
// Failure
console.error('Error:', 'failed to remove');
console.error(e);
}
}
// Update capability
async function updateV1(data) {
// Capability removed?
if (data === null) {
// Remove all connections
for (const id of connsV1)
await removeV1(id);
connsV1 = {};
return;
}
// Process connections
const conns = data.connections;
for (const id in conns) {
// Connection removed?
if (conns[id] === null) {
await removeV1(id);
delete conns[id];
}
}
// Merge changes
connsV1 = merge(connsV1, conns);
// Process updates
for (const id in conns)
await connectV1(id);
}
// Update context changes
async function updateContext(data) {
// Has any data?
if (data === undefined) return;
// Get capability changes
const caps = data.capabilities;
for (const profile in caps) {
// What profile?
switch (profile) {
case KUBE_PROFILE_V1:
// Version 1
await updateV1(caps[profile]);
break;
}
}
}
// Sync context changes
function syncContext(data) {
// Keep changes
changes = merge(changes, data);
// Reset sync timer
if (sync !== undefined)
clearTimeout(sync);
// Defer for later
sync = setTimeout(() => {
sync = undefined;
// Update all changes
updateContext(changes);
changes = {};
}, KUBE_SYNCTIME);
}
// Client application
async function start() {
// Output welcome
console.log('CNS Kube', pack.version);
console.log('CNS Kube on', config.CNS_SERVER_HOST, 'port', config.CNS_SERVER_PORT);
console.log('CNS Dapr on', config.CNS_DAPR_HOST, 'port', config.CNS_DAPR_PORT);
// Bind installer modules
bindInstallers();
// No context?
if (config.CNS_CONTEXT === '')
throw new Error(E_CONTEXT);
console.log('CNS context:', config.CNS_CONTEXT);
// Start client
await client.start();
// Fetch context state
const res = await client.invoker.invoke(
config.CNS_DAPR,
'node/contexts/' + config.CNS_CONTEXT,
dapr.HttpMethod.GET);
// CNS Dapr error?
if (res.error !== undefined)
throw new Error(res.error);
// Initial update
await updateContext(res.data);
// Subscribe to context
server.pubsub.subscribe(
config.CNS_PUBSUB,
'node/contexts/' + config.CNS_CONTEXT,
(KUBE_SYNCTIME > 0)?syncContext:updateContext);
// Start server
await server.start();
}
// Start application
start().catch((e) => {
console.error('System Error:', e.message);
process.exit(1);
});