Express
Library for sending push notifications. Supports Apple APNS and Google FCM services.
At the moment sends pushes to FCM via HTTP and to APNS via HTTP/2 (with either ssl certificate or JWT).
Uses GenServer in order to balance the load. Default buffer (producer) size is 5000. Default consumer max demand is number_of_available_schedulers * 5 (multiplier can be adjusted).
Installation
# in your mix.exs file
def deps do
{:express, "~> 1.2.10"}
end
# in your config.exs file (more in configuration section below)
config :express,
apns: [
mode: :prod,
cert_path: "path_to_your_cert.pem",
key_path: "path_to_your_key.pem"
],
fcm: [
api_key: "your_key"
]
Quick examples
APNS
alias Express.APNS
push_message =
%APNS.PushMessage{
token: "your_device_token",
topic: "your_app_topic",
acme: %{},
aps: %APNS.PushMessage.Aps{
badge: 1,
content_available: 1,
alert: %APNS.PushMessage.Alert{
title: "Hello",
body: "World"
}
}
}
opts = [delay: 5] # in seconds
callback_fun =
fn(push_message, response) ->
IO.inspect("==Push message==")
IO.inspect(push_message)
IO.inspect("==APNS response==")
IO.inspect(response)
end
APNS.push(push_message, opts, callback_fun)
FCM
alias Express.FCM
push_message =
%FCM.PushMessage{
to: "your_device_registration_id",
priority: "high",
content_available: true,
data: %{},
notification: %FCM.PushMessage.Notification{
title: "Hello",
body: "World"
}
}
opts = [delay: 5] # in seconds
callback_fun =
fn(push_message, response) ->
IO.inspect("==Push message==")
IO.inspect(push_message)
IO.inspect("==FCM response==")
IO.inspect(response)
end
FCM.push(push_message, opts, callback_fun)
Configuration
Express can be configured by either config file options or configuration module.
Configuration module is preferable, because it allows you to change some config options dynamically. Every option from configuration module can be overriden by appropriate option in config file.
Basic
config :express,
apns: [
mode: :prod,
cert_path: "your_cert_path.pem",
key_path: "your_key_path.pem"
],
fcm: [
api_key: "your_api_key"
]
There is an option:
Buffer
There are all possible options for the buffer:
config :express,
buffer: [
max_size: 5000,
consumer_demand_multiplier: 5,
adders_pool_config: [
{:name, {:local, :buffer_adders_pool}},
{:worker_module, Express.PushRequests.Adder},
{:size, 5},
{:max_overflow, 1}
]
]
APNS
Possible options for APNS:
You should provide either (cert_path & key_path) or (cert & key) or (key_id & team_id & auth_key_path).
_Every "*path" option has the priority over corresponding option with a file content: cert_path > cert, key_path > key and auth_key_path > auth_key.
If you'd like to use cert/key file content, you should use the original content from a file (even with new-line symbols)
config :express,
apns: [
mode: :prod,
# for requests with jwt
key_id: "your_key_id",
team_id: "your_team_id",
auth_key_path: "your_auth_key_path.p8",
# for requests with a certificate
cert_path: "your_cert_path.pem",
key_path: "your_key_path.pem",
# workers config (if default doesn't meet you requirements)
workers_pool_config: [
{:name, {:local, :apns_workers_pool}},
{:worker_module, Express.APNS.Worker},
{:size, 8},
{:max_overflow, 1}
],
workers_push_async: true
]
FCM
Possible options for FCM:
config :express,
fcm: [
api_key: "your_api_key"
# workers config (if default doesn't meet you requirements)
workers_pool_config: [
{:name, {:local, :fcm_workers_pool}},
{:worker_module, Express.FCM.Worker},
{:size, 8},
{:max_overflow, 1}
]
]
Configuration module
In order to use configuration module, you need:
- create a module that conforms
Express.Configurationbehaviour - define that module in config file
Let a function return empty list [] if you want all default options for a section:
def buffer do
[] #Express will use default options
end
Express.Configuration behaviour is pretty simple, all you need is define functions:
@callback buffer() :: Keyword.t
@callback apns() :: Keyword.t
@callback fcm() :: Keyword.t
For example (for more possible options see the sections above):
defmodule YourApp.ExpressConfig.Dev do
@behaviour Express.Configuration
def buffer do
[
max_size: 1000
]
end
def apns do
[
mode: :dev,
key_id: "your_key_id",
team_id: "your_team_id",
auth_key: "your_auth_key"
]
end
def fcm do
[
api_key: "your_api_key"
]
end
end
Then in config/dev.exs:
config :express, module: YourApp.ExpressConfig.Dev
As said earlier, you can even override your configuration module options later in config file:
config :express,
module: YourApp.ExpressConfig.Dev,
buffer: [
max_size: 1000
]
configuration in config files has the highest priority
Do not forget to add configuration module to .gitignore if it contains secret data
Push message structure
You should construct %Express.APNS.PushMessage{} and %Express.FCM.PushMessage{}
structures and pass them to Express.APNS.push/3 and Express.FCM.push/3 respectively
in order to send a push message.
Express's Express.APNS.PushMessage as well as Express.FCM.PushMessage conforms official
Apple & Google push message structures, so there should not be any confusion with it.
Here are their structures:
APNS
%Express.APNS.PushMessage{
token: String.t,
topic: String.t,
aps: Express.APNS.PushMessage.Aps.t,
apple_watch: map(),
acme: map()
}
%Express.APNS.PushMessage.Aps{
content_available: pos_integer(),
mutable_content: pos_integer(),
badge: pos_integer(),
sound: String.t,
category: String.t,
thread_id: String.t,
alert: Express.APNS.PushMessage.Alert.t | String.t
}
%Express.APNS.PushMessage.Alert{
title: String.t,
body: String.t
}
FCM
%Express.FCM.PushMessage{
to: String.t,
registration_ids: [String.t],
priority: String.t,
content_available: boolean(),
collapse_key: String.t,
data: map(),
notification: PushMessage.Notification.t
}
%Express.FCM.PushMessage.Notification{
title: String.t,
body: String.t,
icon: String.t,
sound: String.t,
click_action: String.t,
badge: pos_integer(),
category: String.t
}
Send a push message
In order to send a push message you should to construct a valid message structure,
define a callback function, which will be invoked on provider's response (APNS or FCM)
and pass them along with options to either Express.FCM.push/3 or Express.APNS.push/3
function (see quick examples above).
Nothing to add here, but:
- a callback function has to take two arguments:
- a push message (which push message structure you tried to send)
- a push result (response received from a provider and handled by Express)
# push result type
@type push_result :: {:ok, %{status: pos_integer(), body: any()}} |
{:error, %{status: pos_integer(), body: any()}}
- at this moment the single option you can pass with
optsargument -delay- it defines a delay in seconds for a push worker (a worker will push a message after that delay)
Supervision tree
Application
|
Supervisor
|
-----------------------------------------------------------------------
| | | |
APNS.Supervisor FCM.Supervisor PushRequests.Supervisor TasksSupervisor
| | | |
| ------------------------- | ------------------------
| | | | | | |
| FCM.DelayedPushes :fcm_workers_pool | Task Task Task
| | |
| ------------------------ |
| | | | |
| FCM.Worker FCM.Worker FCM.Worker |
| |
| ----------------------------------------
| | | |
| PushRequests.Buffer :buffer_adders_pool PushRequests.ConsumersSupervisor
| | |
| ------------- ----------------
| | | | |
| | |PushRequests.Consumer PushRequests.Consumer
| | |
| PushRequests.Adder PushRequests.Adder
|
---------------------------------------------
| | |
APNS.JWTHolder APNS.DelayedPushes :apns_workers_pool
|
--------------------------------------
| | |
APNS.Worker APNS.Worker APNS.Worker
| | |
APNS.Connection APNS.Connection APNS.Connection
LICENSE
Copyright © 2017 Andrey Chernykh ( andrei.chernykh@gmail.com )
This work is free. You can redistribute it and/or modify it under the
terms of the MIT License. See the LICENSE file for more details.