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Nik Mohamad Aizuddin b. Nik Azmi
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feat(example): Add zeromq-pushpull example
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‎zeromq-pushpull/Dockerfile‎

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FROM docker.io/node:14.16.1
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MAINTAINER extra2000 <https://github.com/extra2000>
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COPY ./project /srv/project
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WORKDIR /srv/project
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RUN npm install

‎zeromq-pushpull/README.md‎

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# Sample apps: ZeroMQ Push/Pull
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```
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$ podman build -t extra2000/zeromq-pushpull:latest .
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$ podman play kube --network=sampleapps zeromq-pushpull-pod.yaml
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```
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View logs:
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```
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$ podman logs zeromq-pushpull-pod-producer
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$ podman logs zeromq-pushpull-pod-worker
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```
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To clean up:
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```
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$ podman pod rm --force zeromq-pushpull-pod
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```

‎zeromq-pushpull/project/.gitignore‎

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# Logs
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logs
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*.log
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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lerna-debug.log*
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# Diagnostic reports (https://nodejs.org/api/report.html)
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report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
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# Runtime data
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pids
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*.pid
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*.seed
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*.pid.lock
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# Directory for instrumented libs generated by jscoverage/JSCover
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lib-cov
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# Coverage directory used by tools like istanbul
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coverage
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*.lcov
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# nyc test coverage
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.nyc_output
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# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
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.grunt
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# Bower dependency directory (https://bower.io/)
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bower_components
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# node-waf configuration
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.lock-wscript
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# Compiled binary addons (https://nodejs.org/api/addons.html)
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build/Release
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# Dependency directories
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node_modules/
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jspm_packages/
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# TypeScript v1 declaration files
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typings/
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# TypeScript cache
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*.tsbuildinfo
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# Optional npm cache directory
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.npm
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# Optional eslint cache
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.eslintcache
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# Microbundle cache
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.rpt2_cache/
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.rts2_cache_cjs/
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.rts2_cache_es/
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.rts2_cache_umd/
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# Optional REPL history
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.node_repl_history
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# Output of 'npm pack'
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*.tgz
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# Yarn Integrity file
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.yarn-integrity
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# dotenv environment variables file
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.env
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.env.test
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# parcel-bundler cache (https://parceljs.org/)
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.cache
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# Next.js build output
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.next
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# Nuxt.js build / generate output
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.nuxt
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dist
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# Gatsby files
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.cache/
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# Comment in the public line in if your project uses Gatsby and *not* Next.js
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# https://nextjs.org/blog/next-9-1#public-directory-support
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# public
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# vuepress build output
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.vuepress/dist
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# Serverless directories
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.serverless/
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# FuseBox cache
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.fusebox/
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# DynamoDB Local files
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.dynamodb/
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# TernJS port file
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.tern-port

‎zeromq-pushpull/project/package.json‎

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{
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"name": "zeromq-pushpull",
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"version": "1.0.0",
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"description": "ZeroMQ Push/Pull example",
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"author": "extra2000",
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"license": "MIT",
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"scripts": {
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"tsc": "tsc",
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"producer": "ts-node src/producer.ts",
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"worker": "ts-node src/worker.ts"
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},
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"dependencies": {
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"zeromq": "6.0.0-beta.6"
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},
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"devDependencies": {
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"typescript": "^4.0.2",
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"ts-node": "^9.0.0",
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"@types/node": "^14.11.2"
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}
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}

‎zeromq-pushpull/project/src/producer.ts‎

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const zmq = require("zeromq");
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async function run() {
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const sock = new zmq.Push;
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await sock.bind("tcp://127.0.0.1:3000");
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console.log("Producer bound to port 3000");
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while (true) {
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await sock.send("some work");
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await new Promise(resolve => setTimeout(resolve, 500));
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}
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}
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run();

‎zeromq-pushpull/project/src/worker.ts‎

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const zmq = require("zeromq");
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async function run() {
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const sock = new zmq.Pull;
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sock.connect("tcp://127.0.0.1:3000");
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console.log("Worker connected to port 3000");
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for await (const [msg] of sock) {
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console.log("work: %s", msg.toString());
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}
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}
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run();

‎zeromq-pushpull/project/tsconfig.json‎

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{
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"compilerOptions": {
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/* Visit https://aka.ms/tsconfig.json to read more about this file */
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/* Basic Options */
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// "incremental": true, /* Enable incremental compilation */
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"target": "es5", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
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"module": "commonjs", /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
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// "lib": [], /* Specify library files to be included in the compilation. */
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// "allowJs": true, /* Allow javascript files to be compiled. */
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// "checkJs": true, /* Report errors in .js files. */
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// "jsx": "preserve", /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
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// "declaration": true, /* Generates corresponding '.d.ts' file. */
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// "declarationMap": true, /* Generates a sourcemap for each corresponding '.d.ts' file. */
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// "sourceMap": true, /* Generates corresponding '.map' file. */
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// "outFile": "./", /* Concatenate and emit output to single file. */
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"outDir": "./build", /* Redirect output structure to the directory. */
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// "rootDir": "./", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
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// "composite": true, /* Enable project compilation */
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// "tsBuildInfoFile": "./", /* Specify file to store incremental compilation information */
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// "removeComments": true, /* Do not emit comments to output. */
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// "noEmit": true, /* Do not emit outputs. */
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// "importHelpers": true, /* Import emit helpers from 'tslib'. */
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// "downlevelIteration": true, /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
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// "isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
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/* Strict Type-Checking Options */
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"strict": true, /* Enable all strict type-checking options. */
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// "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */
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// "strictNullChecks": true, /* Enable strict null checks. */
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// "strictFunctionTypes": true, /* Enable strict checking of function types. */
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// "strictBindCallApply": true, /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
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// "strictPropertyInitialization": true, /* Enable strict checking of property initialization in classes. */
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// "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */
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// "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */
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/* Additional Checks */
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// "noUnusedLocals": true, /* Report errors on unused locals. */
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// "noUnusedParameters": true, /* Report errors on unused parameters. */
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// "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
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// "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */
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/* Module Resolution Options */
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// "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
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// "baseUrl": "./", /* Base directory to resolve non-absolute module names. */
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// "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
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// "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */
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// "typeRoots": [], /* List of folders to include type definitions from. */
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// "types": [], /* Type declaration files to be included in compilation. */
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// "allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
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"esModuleInterop": true, /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
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// "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */
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// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
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/* Source Map Options */
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// "sourceRoot": "", /* Specify the location where debugger should locate TypeScript files instead of source locations. */
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// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
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// "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */
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// "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
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/* Experimental Options */
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// "experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */
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// "emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */
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/* Advanced Options */
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"skipLibCheck": true, /* Skip type checking of declaration files. */
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"forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */
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}
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}

‎zeromq-pushpull/zeromq-pushpull-pod.yaml‎

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apiVersion: v1
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kind: Pod
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metadata:
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name: zeromq-pushpull-pod
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spec:
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restartPolicy: Never
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containers:
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- name: producer
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image: extra2000/zeromq-pushpull
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command: ['npm', 'run', 'producer']
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ports:
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- containerPort: 3000
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hostPort: 3000
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protocol: tcp
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- name: worker
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image: extra2000/zeromq-pushpull
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command: ['npm', 'run', 'worker']

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