Flamingo Core Concepts

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Core Concepts

• ﬂamingo.App
• Dingo
• Conﬁg
• Routing

Flamingo Bootstrap

Bootstrap
• Define the configuration Areas

• Load default configuration

• Load the current configuration and routing informa...

ﬂamingo.App

ﬂamingo.App
• Main entry point, starts the Flamingo instance

• Conﬁgures dingo dependency injection and runs the root
com...

flamingo.App / Changes
• flamingo.App(..., flamingo.AppAutorun(false))

• Allows external control of the App lifecycle

Dingo Modules

Dingo
• Flamingo Dependency Injection

• Interface similar to Guice

• Supports Singleton, Multi-/Mapbindings

Dingo
type HelloController struct {
responder *web.Responder
}
func (c *HelloController) Inject(responder *web.Responder) ...

General
• Bind dependencies on application startup (in code)

• (future support for compile-type bindings)

• Conﬁg-Tree b...

Binding
• General Syntax:

injector.Bind(new(Iface)).To(IfaceImpl{})
• .To(type) binds to a type

• .ToInstance(instance) ...

Annotation
• Default annotation is empty

injector.Bind(new(Iface)).AnnotatedWith("special-case").To(IfaceImpl{})
• Inject...

Singleton Scopes
• If really necessary it is possible to use singletons

• .AsEagerSingleton() binds as a singleton, and l...

MultiBindings
• Allows to bind multiple instances/providers/types for one
type
func (*Module) Configure(injector *dingo.In...

MapBindings
• Similiar to Multibindings, but with a key instead of a list
func (*Module) Configure(injector *dingo.Injecto...

Provider
• If you need to make sure bindings are lazy evaluated, or
need multiple instances of a certain type, it is possi...

Provider
• It is possible to get provider for map/multibindings

• It is possible to get provider for provider

• Use with...

Conﬁguration

config.Map
• config.Map is a container for string -> interface{}

• configuration is available via annotated injection

• MyC...

Conﬁg Merging
• Dot . separated conﬁg keys

• Every . donates one level in the tree:
my.config.value: hello
my:
config:
va...

Conﬁg Merging
• Conﬁg Maps are deep merged

• Allows overriding sub-keys:
my:
foo: bar
config:
value: hello
value2: world
...

Config Loading
• YAML Loader (others might follow)

• ENV Substitution via %%ENV:something%%default%
%

• config.yml

• confi...

Conﬁguration Areas

Configuration Areas
• Flamingo Config is hierarchical

• Config Areas can have multiple children, they inherit
config and depe...

Conﬁg
Upcoming Changes
• Cuelang support

• Allows Schema validation and much more

Default Configuration
• Modules in Flamingo can provide a default config, and
override existing config during the bootstrap

...

Default Conﬁguration
func (m *Module) DefaultConfig() config.Map {
return config.Map{
"my.config.test": "default value",
}...

Overridden Conﬁguration
func (m *Module) OverrideConfig(current config.Map) config.Map {
if oldvalue, ok := current.Get("m...

Routing

Routing: Paths
• Named Parameters: /route/:name

• Match everything until the following /

• Regex Parameters: /route/$nam...

Routing: Controller
• Map a route to a controller, either in routes.yml or in code

• my.controller

• Gets all URL parame...

Routing: Reverse
• Reverse URLs are build based on available routes

• web.ReverseRouter

• Newest routes take precendence...

web.RouterRegistry
• HandleGet(context.Context, *web.Request) web.Result for
GET

• HandlePost(context.Context, *web.Reque...

web.RouterRegistry
type routes struct {
controller *controller
}
func (r *routes) Inject(controller *controller) {
r.contr...

core.Preﬁxrouter
• The core.Preﬁxrouter module provides a HTTP Router
which routes requests based on hostname/path

• When...

core.Cmd Package

core.Cmd
• Based on spf13/cobra

• Inject *cobra.Command with annotation ﬂamingo to get
the main command

• Bind to cobra....

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