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Agador metaservice for microservices

Project Description

# Agador Metaservice for Microservices

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Agador is a tool for easily fetching microservice clients using a [consul Key/Value data]( or using its own deployable microservice. With a loaded KV store or a deployed microservice, the agador client can supply a handle to another service.

## Configuration

The agador configuration YAML file defines its services by name and then defines the Python object it will return. An example redis configuration might look like this:

port: 6379
db: 0

This defines a service called `"redis"` that will be initialized in Python with:

redis.StrictRedis(host="", port=6379, db=0)

## Consul

Consul provides a KV store that can be accessed via `http://<host>:8500/v1/kv/<keys>`. The `consul` module of agador exposes a `load_config()` method that can be used to load a dictionary into the KV store.

config = {
"redis": {
"redis.StrictRedis": {
"host": "",
"port": 6379,
"db": 0


By default agador stores its config under the prefix `/v1/kv/agador/<service>/<object>/<arg>`. The `flags` value of the key is used to determine the type:

* `1` is a float
* `2` is an int
* `3` is a string

## Agador Server

If for whatever reason it is not possible to use consul, an agador server can be stood up using the `agador` command and a supplied JSON or YAML configuration URL. Becasue agador uses [furi]( to parse the URL, the configuration file can be stored locally or on S3.

agador --config s3://bucket/path/to/config.yaml

# or

agador --config ./config.json

## Agador Client

Once an agador service is available through consul or its own service, a Python client can be used to extract a service client for any service defined in the service's configuration.

Example `myservice` usage:

import agador

myservice = agador.service("myservice", host="localhost", port=8500)
# => <MyServiceClient>

Agador accepts `ENV` variables as defaults for the agador service location:

* `AGADOR_HOST` the consul or agador host
* `AGADOR_PORT` the consul or agador port
* `AGADOR_SCHEME` http or https
* `AGADOR_KVPATH` the endpoint of the consul KV store (eg, `/v1/kv/agador`)

## Agador example using docker-compose

One potential use case for agador is to stand up a sandboxed local environment where all the services are available locally in a Docker network. A runnable example of this can be found in the [example](./example) directory of this repository.

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