48 lines
1.7 KiB
Kotlin
48 lines
1.7 KiB
Kotlin
package cash.z.ecc.android.sdk.internal
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import android.content.Context
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import cash.z.ecc.android.sdk.internal.ext.canWriteSuspend
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import cash.z.ecc.android.sdk.internal.ext.existsSuspend
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import cash.z.ecc.android.sdk.internal.ext.getNoBackupFilesDirCompat
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import cash.z.ecc.android.sdk.internal.ext.mkdirsSuspend
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import kotlinx.coroutines.sync.Mutex
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import kotlinx.coroutines.sync.withLock
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import java.io.File
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/**
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* Because the filesystem is a shared resource, this declares the filenames that the SDK is using
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* in one centralized place.
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*/
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internal object Files {
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/**
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* Subdirectory under the Android "no backup" directory which is owned by the SDK.
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*/
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const val NO_BACKUP_SUBDIRECTORY = "co.electricoin.zcash" // $NON-NLS
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private val accessMutex = Mutex()
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/**
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* @return Subdirectory of the "no_backup" directory that is owned by the SDK. The returned
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* directory will exist when this method returns.
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*
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* As we use a suspend version of the file operations here, we protect the operations with mutex
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* to prevent multiple threads to invoke the function at the same time.
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*/
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suspend fun getZcashNoBackupSubdirectory(context: Context): File {
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val dir = File(context.getNoBackupFilesDirCompat(), NO_BACKUP_SUBDIRECTORY)
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accessMutex.withLock {
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if (!dir.existsSuspend()) {
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if (!dir.mkdirsSuspend()) {
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error("${dir.absolutePath} directory does not exist and could not be created")
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}
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}
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if (!dir.canWriteSuspend()) {
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error("${dir.absolutePath} directory is not writable")
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}
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}
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return dir
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}
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}
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