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Kotlin Coroutines for Retrofit v0.2
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- Result classes now implement one or two of interfaces:
  ResponseResult and ResponseError. It allows simplify access to results in some cases
- Moved to the separate repo
- Kotlin 1.1.0-rc-91
- kotlinx.coroutines 0.10-rc
- JCenter and Maven publish configs
- Updated examples in readme
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10 changes: 10 additions & 0 deletions CHANGELOG.md
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# CHANGELOG

## 0.2.0

- Result classes now implement one or two of interfaces: ResponseResult and ResponseError. It allows simplify access to results in some cases
- Moved to the separate repo
- Kotlin 1.1.0-rc-91
- kotlinx.coroutines 0.10-rc
- JCenter and Maven publish configs
- Updated examples in readme
176 changes: 176 additions & 0 deletions LICENSE
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121 changes: 85 additions & 36 deletions README.md
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# Kotlin Coroutines for Retrofit

This is small library that provides await() extensions for Retrofit 2
This is small library that provides [Kotlin Coroutines](https://github.com/Kotlin/kotlin-coroutines/blob/master/kotlin-coroutines-informal.md) [suspending](https://github.com/Kotlin/kotlin-coroutines/blob/master/kotlin-coroutines-informal.md#suspending-functions) extension `Call.await()` for [Retrofit 2](https://github.com/square/retrofit)

There is two different API:
Based on [kotlinx.coroutines](https://github.com/Kotlin/kotlinx.coroutines) implementation

## Download
Download the [JAR](https://bintray.com/gildor/maven/kotlin-coroutines-retrofit#files/ru/gildor/coroutines/kotlin-coroutines-retrofit):

Gradle:

```groovy
compile 'ru.gildor.coroutines:kotlin-coroutines-retrofit:0.2.0'
```

Maven:

```xml
<dependency>
<groupId>ru.gildor.coroutines</groupId>
<artifactId>kotlin-coroutines-retrofit</artifactId>
<version>0.2.0</version>
<type>pom</type>
</dependency>
```


## How to use
There is two suspending extensions:

### `.await()`

Common await API that returns result or throw exception
```kotlin
fun Call<T>.await(): T
```

In case of HTTP error or invocation exception `await()` throws exception

```kotlin
// Any coroutine implementation
launch(CoroutineContext) {
// You can use retrofit suspended extension inside any coroutine block
fun main(args: Array<String>) = runBlocking {
try {
// Wait (suspend) for response
val user: User = api.getUser("username").await()
// Now we can work with result object
saveToDb(user)
log("User ${user.name} saved")
println("User ${user.name} loaded")
} catch (e: HttpError) {
// Catch any error HTTP statuses
log("HTTP error with code ${e.code}", e)
// Catch http errors
println("exception${e.code}", e)
} catch (e: Throwable) {
// All other exception while request invocation
log("Something broken", e)
// All other exceptions (non-http)
println("Something broken", e)
}
}
```

### `.awaitResult()`

API based on sealed class `Result`:

```kotlin
fun Call<T>.await(): Result<T>
```

```kotlin
launch(CoroutineContext) {
// Wait (suspend) for Result
val result: User = api.getUser("username").awaitResult()
// Check result type
when (result) {
//Successful HTTP result
is Result.Ok -> saveToDb(result.value)
// Any HTTP error
is Result.Error -> log("HTTP error with code ${result.error.code}", result.error)
// Exception while request invocation
is Result.Exception -> log("Something broken", e)
}
fun main(args: Array<String>) = runBlocking {
// Wait (suspend) for Result
val result: Result<User> = api.getUser("username").awaitResult()
// Check result type
when (result) {
//Successful HTTP result
is Result.Ok -> saveToDb(result.value)
// Any HTTP error
is Result.Error -> log("HTTP error with code ${result.error.code}", result.error)
// Exception while request invocation
is Result.Exception -> log("Something broken", e)
}
}
```

Also, `Result` has a few handy extension functions that allow to avoid `when` block matching:

```kotlin
launch(CoroutineContext) {
val result: User = api.getUser("username").awaitResult()

//Return value for success or null for any http error or exception
result.getOrNull()

//Return result or default value
result.getOrDefault(User("empty-user"))

//Return value or throw exception (HttpError or original exception)
result.getOrThrow()
//Also supports custom exceptions to override original ones
result.getOrThrow(IlleagalStateException("User request failed"))
fun main(args: Array<String>) = runBlocking {
val result: User = api.getUser("username").awaitResult()

//Return value for success or null for any http error or exception
result.getOrNull()

//Return result or default value
result.getOrDefault(User("empty-user"))

//Return value or throw exception (HttpError or original exception)
result.getOrThrow()
//Also supports custom exceptions to override original ones
result.getOrThrow(IlleagalStateException("User request failed"))
}
```

All `Result` classes also implemented one or both interfaces: `ResultResponse` and `ResultError`
You can use them for access to shared properties of different classes from `Result`

```kotlin
fun main(args: Array<String>) = runBlocking {
val result: User = api.getUser("username").awaitResult()

//Result.Ok and Result.Error both implement ResponseResult
if (result is ResponseResult) {
//And after smart cast you now have an access to okhttp3 Response property of result
println("Result ${result.response.code()}: ${result.response.message()}")
}

//Result.Error and Result.Exception implement ErrorResult
if (result is ErrorResult) {
// Here yoy have an access to `exception` property of result
throw result.exception
}
}
```
```
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