reweb

Redis-based caching proxy for web pages.

Use case

We require a local proxy to cache requests to Google Maps API into Redis.

Usage

Installation

Docker

We can build and run via Docker:

docker build -t reweb https://github.com/evanx/reweb.git

See https://github.com/evanx/reweb/blob/master/Dockerfile

FROM mhart/alpine-node:latest
ADD package.json .
RUN npm install --silent
ADD lib lib
ENV NODE_ENV production
CMD ["node", "lib/index.js"]

We might simply run with --network=host i.e. using our host's Redis:

docker run --network=host --restart unless-stopped -d \
  -e httpPort=8851 \
  reweb

git clone

Alternatively you can git clone etc:

git clone https://github.com/evanx/reweb.git
cd reweb
npm install
apiKey=$MAPS_API_KEY npm start

Redis keys

We scan keys:

redis-cli --scan --pattern 'cache-reweb:*:json'

where we find keys e.g.

cache-reweb:64bdaff72bfc67deb55326022371ffef3ace9c7b

where keys are named using the SHA of the request path and query.

Check the TTL:

redis-cli ttl cache-reweb:64bdaff72bfc67deb55326022371ffef3ace9c7b

(integer) 1814352

Config spec

See lib/spec.js https://github.com/evanx/reweb/blob/master/lib/spec.js

Implementation

See lib/main.js https://github.com/evanx/reweb/blob/master/lib/main.js

Analytics

where for Mobile browsers we format the metrics in HTML. In our desktop browser, we typically have JSON formatter extension installed, and so can view JSON responses. But that is not the case on mobile, and perhaps we want to manually monitor the metrics on our mobile phone.

Incidently, we use a related module for basic HTML formatting: https://github.com/evanx/render-html-rpf

Appication archetype

Incidently lib/index.js uses the redis-koa-app application archetype.

require('redis-koa-app')(
    require('../package'),
    require('./spec'),
    async deps => Object.assign(global, deps),
    () => require('./main')
).catch(console.error);

where we extract the config from process.env according to the spec and invoke our main function.

See https://github.com/evanx/redis-koa-app.

This provides lifecycle boilerplate to reuse across similar applications.