Consul

100% API Complete Consul Client written in Elixir

Recent Changes

Higher level support for KV api and blocking queries on KV api (watching a KV for changes). See the hex docs for now. I'll add an quick how-to to the readme soon.

Added some tests for the Raw client. Probably brittle and needs work but they did catch some errors I hadn't noticed. They also servce as examples for how to use some of the endpoints.

Found some issues with the way the paths were being generated in the Consul.HTTP.Raw client. This should fix those problems.

Usage

This package is very alpha

iex> alias Consul.HTTP.Raw, as: Consul
Consul.HTTP.Raw

iex> Consul.kv_get "elixir"
%HTTPoison.Response{body: [%{"CreateIndex" => 18024, "Flags" => 0,
    "Key" => "elixir", "LockIndex" => 0, "ModifyIndex" => 18024,
    "Value" => "wat"}],
 headers: [{"Content-Type", "application/json"}, {"X-Consul-Index", "18024"},
  {"X-Consul-Knownleader", "true"}, {"X-Consul-Lastcontact", "0"},
  {"Date", "Thu, 01 Dec 2016 23:33:39 GMT"}, {"Content-Length", "97"}],
 status_code: 200}

iex> Consul.kv_get "elixir", dc: "dc1"
%HTTPoison.Response{body: [%{"CreateIndex" => 18024, "Flags" => 0,
    "Key" => "elixir", "LockIndex" => 0, "ModifyIndex" => 18024,
    "Value" => "wat"}],
 headers: [{"Content-Type", "application/json"}, {"X-Consul-Index", "18024"},
  {"X-Consul-Knownleader", "true"}, {"X-Consul-Lastcontact", "0"},
  {"Date", "Thu, 01 Dec 2016 23:36:06 GMT"}, {"Content-Length", "97"}],
 status_code: 200}

All the functions provided are built during compile time from a map inside the Consul.HTTP.Raw module. The names of the functions correspond with the http endpoint exposed by consul. For example the endpoint v1/acl/create maps to a function Consul.HTTP.Raw.acl_create\1. In cases where the same endpoint accepts different HTTP verbs (get, put, post, etc.), the function name are postfixed with the verb name. For example the endpoint v1/kv accepts both get and put so there are 2 functions named kv_get and kv_put.

There are a few exceptions where the name of the function wouldn't make much sense. If the function for v1/session/node was named session_node it may cause some confusion, but session_for_node makes more sense.

Also the query endpoints fall into a wierd situation. The endpoint v1/query accepts both a get and a post. So there are 2 functions named query_get and query_post. But then there is another endpoint v1/query/#{query_id} that accepts get, put, and delete. To avoid confusion, these functions are named like query_get_by_id.

Every function can take an optional keyword params that get turned into url query params. If you need to specify something like the dc to query, or pass a consul index, this is how you would do it.

# KV check and set example
Consul.HTTP.Raw.kv_put "elixir", "is awesome", cas: 23

Endpoint -> Function mappings

Endpoint	Function
v1/acl/create	:acl_create
v1/acl/update	:acl_update
v1/acl/destroy/#{id}	:acl_destroy
v1/acl/info/#{id}	:acl_info
v1/acl/clone/#{id}	:acl_clone
v1/acl/list	:acl_list
v1/acl/replication	:acl_replication
v1/agent/checks	:agent_checks
v1/agent/services	:agent_services
v1/agent/members	:agent_members
v1/agent/self	:agent_self
v1/agent/maintenance	:agent_maintenance
v1/agent/join/#{address}	:agent_join
v1/agent/force-leave/#{node_id}	:agent_force_leave
v1/agent/check/register	:agent_check_register
v1/agent/check/deregister/#{check_id}	:agent_check_deregister
v1/agent/check/pass/#{check_id}	:agent_check_pass
v1/agent/check/warn/#{check_id}	:agent_check_warn
v1/agent/check/fail/#{check_id}	:agent_check_fail
v1/agent/check/update/#{check_id}	:agent_check_update
v1/agent/service/register	:agent_service_register
v1/agent/service/deregister/#{service_id}	:agent_service_deregister
v1/agent/service/maintenance/#{service_id}	:agent_service_maintenance
v1/catalog/register	:catalog_register
v1/catalog/deregister	:catalog_deregister
v1/catalog/datacenters	:catalog_datacenters
v1/catalog/nodes	:catalog_nodes
v1/catalog/services	:catalog_services
v1/catalog/services/#{service}	:catalog_service
v1/catalog/node/#{node_id}	:catalog_node
v1/event/fire/#{name}	:event_fire
v1/event/list	:event_list
v1/health/node/#{node_id}	:health_node
v1/health/checks/#{service}	:health_checks
v1/health/service/#{service}	:health_service
v1/health/state/#{state}	:health_state
v1/kv/#{key}	:kv_get
v1/kv/#{key}	:kv_put
v1/kv/#{key}	:kv_delete
v1/txn	:kv_txn
v1/coordinate/datacenters	:coordinate_datacenters
v1/coordinate/nodes	:coordinate_nodes
v1/operator/raft/configuration	:operator_raft_configuration
v1/operator/raft/peer	:operator_raft_peer_delete
v1/operator/keyring	:operator_keyring_get
v1/operator/keyring	:operator_keyring_put
v1/operator/keyring	:operator_keyring_post
v1/operator/keyring	:operator_keyring_delete
v1/query	:query_get
v1/query	:query_post
v1/query/#{query}	:query_get_by_id
v1/query/#{query}	:query_put_by_id
v1/query/#{query}	:query_delete_by_id
v1/query/#{query}/execute	:query_execute
v1/query/#{query}/explain	:query_explain
v1/session/create	:session_create
v1/session/destroy/#{session}	:session_destroy
v1/session/info/#{session}	:session_info
v1/session/node/#{node}	:session_for_node
v1/session/list	:session_list
v1/session/renew/#{session}	:session_renew
v1/snapshot	:snapshot_get
v1/snapshot	:snapshot_put
v1/status/leader	:status_leader
v1/status/peers	:status_peers

Installation

If available in Hex, the package can be installed as:

1. Add consul to your list of dependencies in mix.exs:

```elixir
def deps do
  [{:consul, "~> 0.1.3", hex: :consul_client}]
end
```

2. Ensure consul is started before your application:

```elixir
def application do
  [applications: [:consul]]
end
```