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An OkHttp wrapper based on RxJava using Jackson for JSON

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package com.lightningkite.rx.okhttp

import com.fasterxml.jackson.core.type.TypeReference
import com.fasterxml.jackson.module.kotlin.jacksonTypeRef
import com.fasterxml.jackson.module.kotlin.readValue
import io.reactivex.rxjava3.core.Single
import okhttp3.Response
import java.lang.reflect.ParameterizedType

/**
 * Changes unsuccessful responses into [HttpResponseException].
 */
fun Single.unsuccessfulAsError(): Single {
    return this.map { it ->
        if (it.isSuccessful) {
            return@map it
        } else {
            throw HttpResponseException(it)
        }
    }
}

/**
 * Properly discards the response.
 */
fun Single.discard(): Single {
    return this.flatMap {
        if (it.isSuccessful) {
            it.discard()
        } else {
            Single.error(HttpResponseException(it)) as Single
        }
    }
}

/**
 * Reads the response into JSON using the [defaultJsonMapper].
 */
inline fun  Single.readJson(): Single {
    val type = jacksonTypeRef()
    return this.flatMap { it ->
        if (it.isSuccessful) {
            it.readJson(type)
        } else {
            Single.error(HttpResponseException(it)) as Single
        }
    }
}

/**
 * Reads the response into JSON using the [defaultJsonMapper], but prints the raw value to [System.out].
 */
inline fun  Single.readJsonDebug(): Single {
    val type = jacksonTypeRef()
    return this.flatMap { it ->
        if (it.isSuccessful) {
            it.readJsonDebug(type)
        } else {
            Single.error(HttpResponseException(it)) as Single
        }
    }
}

/**
 * Reads the text from the [Response].
 */
fun Single.readText(): Single {
    return this.flatMap { it ->
        if (it.isSuccessful) {
            it.readText()
        } else {
            Single.error(HttpResponseException(it))
        }
    }
}

/**
 * Reads the binary data from the [Response].
 */
fun Single.readByteArray(): Single {
    return this.flatMap { it ->
        if (it.isSuccessful) {
            it.readByteArray()
        } else {
            Single.error(HttpResponseException(it))
        }
    }
}