README
¶
FX
The FX package provides dependency injection and component lifecycle management functionalities for applications built with the Boost framework. This package is essential for building modular and testable applications.
Overview
FX simplifies the creation and management of dependencies between components, allowing developers to define reusable modules and compose complex applications in an organized manner. It draws inspiration from dependency injection frameworks, adapted for the Go ecosystem.
Main Components
Modules
The modules subpackage contains implementations of pre-defined modules that can be used to compose applications. These modules encapsulate common functionalities and can be easily integrated into different applications.
The available modules include integrations with various components of the Boost ecosystem, such as caching systems, configuration, logging, and message publishing. Each module is designed to be independent and easily combinable with other modules.
Factory modules
Each fx/modules/factory/contrib/<path> mirrors factory/contrib/<path> and wraps its default constructor. Plugins are optional ([]Plugin in the graph). Resources with a close/shutdown are released on app stop.
| Module | Entry points | Provides | Requires from the app |
|---|---|---|---|
allegro/bigcache/v3 |
Module |
*bigcache.BigCache |
— |
apache/cassandra-gocql-driver/v2 |
Module |
*gocql.Session |
— |
aws/aws-sdk-go-v2/v1 |
Module |
aws.Config |
— |
aws/aws-sdk-go-v2/v1/client/sns, /sqs, /kinesis |
Module |
SDK *<service>.Client and boost <service>.Client |
— |
cloud.google.com/bigquery/v1 |
Module |
*bigquery.Client |
— |
cloud.google.com/bigtable/v1 |
Module |
*bigtable.Client |
— |
cloud.google.com/firestore/v1 |
Module |
*firestore.Client |
— |
cloud.google.com/pubsub/v1, v2 |
Module |
*pubsub.Client |
— |
confluentinc/confluent-kafka-go/v2 |
ProducerModule, ConsumerModule |
kafka producer / consumer | — |
coocood/freecache/v1 |
Module |
*freecache.Cache |
— |
datadog/dd-trace-go/v1 |
TracerModule, ProfilerModule |
starts tracer/profiler | — |
elastic/go-elasticsearch/v8, v9 |
Module, BulkModule |
*elasticsearch.Client, esutil.BulkIndexer |
— |
go-resty/resty/v2 |
Module |
*resty.Client |
— |
go.mongodb.org/mongo-driver/v1, v2 |
Module |
*mongo.Conn, *mongo.Database |
— |
go.opentelemetry.io/otel/v1 |
Module |
starts tracer and meter providers | — |
gocloud.dev/pubsub/v0 |
TopicModule, SubscriptionModule |
*pubsub.Topic, *pubsub.Subscription |
— |
gocql/gocql/v1 |
Module |
*gocql.Session |
— |
godror/godror/v0 |
Module |
*sql.DB |
— |
google.golang.org/grpc/v1/client |
Module |
*grpc.ClientConn |
— |
google.golang.org/grpc/v1/server |
Module |
*server.Server, *grpc.Server |
— |
graphql-go/graphql/v0 |
Module |
*handler.Handler |
*graphql.Schema |
hashicorp/memdb/v1 |
Module |
*memdb.MemDB |
*memdb.DBSchema |
jackc/pgx/v5 |
Module |
*sql.DB |
— |
jlaffaye/ftp/v0 |
Module |
*ftp.ServerConn |
— |
k8s.io/client-go/v0 |
Module |
*kubernetes.Clientset |
— |
labstack/echo/v4 |
Module |
*echo.Server, *echo.Echo |
— |
lovoo/goka/v1 |
Module |
goka emitter | — |
mittwald/vaultgo/v0 |
Module |
*vault.Client |
— |
nats-io/nats.go/v1 |
Module |
nats connection | — |
panjf2000/ants/v2 |
Module |
*ants.Wrapper |
— |
prometheus/client_golang/v1 |
PusherModule |
starts push gateway pusher (if enabled) | — |
redis/go-redis/v9 |
ClientModule, ClusterModule |
*redis.Client, *redis.ClusterClient |
— |
segmentio/kafka-go/v0 |
WriterModule, ReaderModule |
*kafka.Writer, *kafka.Reader (closed on stop) |
— |
tidwall/buntdb/v1 |
Module |
*buntdb.DB |
— |
godror and pgx both provide *sql.DB: compose only one per app.
Pub/Sub v1 and v2 are both composable: boost.factory.gcp.pubsub.version
(v2 by default) turns on one of them. The publisher driver and the function
adapter pick their version the same way, through
boost.wrapper.publisher.driver.pubsub.version and
boost.bootstrap.function.adapter.pubsub.version. To stay on v1, set the
three keys to v1; any value other than v1 or v2 fails the boot.
How to Use
To use the FX package in your application:
- Import the package and the specific modules you want to use
- Define your own modules to encapsulate business logic
- Compose the modules to create your application
- Use the dependency injection system to access components in your code
FX automatically manages the lifecycle of components, ensuring they are initialized in the correct order and properly finalized when the application is terminated.
Integration with Other Packages
FX deeply integrates with other components of the Boost framework:
- Bootstrap: For application initialization
- Factory: For creating component instances
- Wrapper: For accessing adapters to external libraries
- Model: For defining interfaces and structures
Extensibility
The FX package was designed to be easily extensible. To add new modules:
- Create a new subpackage in
moduleswith the name of the module - Implement the necessary interfaces to define the module
- Add appropriate tests and documentation
Contribution
Contributions to the FX package are welcome. When contributing, make sure to follow the code standards and add appropriate tests for new functionalities.
Directories
¶
| Path | Synopsis |
|---|---|
|
modules
|
|
|
bootstrap/function/adapter/contrib/cloud.google.com/pubsub
Package pubsub declares, once, the config the Pub/Sub v1 and v2 function adapter fx modules share: whether the adapter is on and which version it is.
|
Package pubsub declares, once, the config the Pub/Sub v1 and v2 function adapter fx modules share: whether the adapter is on and which version it is. |
|
factory/contrib/cloud.google.com/pubsub
Package pubsub holds what the Pub/Sub v1 and v2 fx modules share: the version values and the factory's version key, declared once.
|
Package pubsub holds what the Pub/Sub v1 and v2 fx modules share: the version values and the factory's version key, declared once. |
|
factory/contrib/elastic/go-elasticsearch/v9
Package elastic provides the fx modules of boost's go-elasticsearch v9 factory.
|
Package elastic provides the fx modules of boost's go-elasticsearch v9 factory. |
|
wrapper/publisher/driver/contrib/cloud.google.com/pubsub
Package pubsub declares, once, the config the Pub/Sub v1 and v2 publisher driver fx modules share: whether the driver is on and which version it is.
|
Package pubsub declares, once, the config the Pub/Sub v1 and v2 publisher driver fx modules share: whether the driver is on and which version it is. |