config

type Client struct {
	DataDir string `yaml:"data-dir"` // Directory where the WAL and pin file should be kept. Default: .utahfs

	StorageProvider *StorageProvider `yaml:"storage-provider"`
	MaxWALSize      int              `yaml:"max-wal-size"`    // Max number of blocks to put in WAL before blocking on remote storage. Default: 128*1024 blocks
	WALParallelism  int              `yaml:"wal-parallelism"` // Number of threads to use when draining the WAL. Default: 1
	DiskCacheSize   int64            `yaml:"disk-cache-size"` // Size of on-disk LRU cache. Default: 320*1024 blocks, -1 to disable.
	DiskCacheLoc    string           `yaml:"disk-cache-loc"`  // Special location for on-disk LRU cache. Default is to store cache inside data-dir.
	MemCacheSize    int              `yaml:"mem-cache-size"`  // Size of in-memory LRU cache. Default: 32*1024 blocks, -1 to disable.
	KeepMetadata    bool             `yaml:"keep-metadata"`   // Keep a local copy of metadata, always. Default: false.

	RemoteServer *RemoteServer `yaml:"remote-server"`

	Password string `yaml:"password"` // Password for encryption and integrity. User will be prompted if not provided.

	NumPtrs  int64 `yaml:"num-ptrs"`  // Number of pointers in a file's skiplist. Default: 12
	DataSize int64 `yaml:"data-size"` // Amount of data kept in each of a file's blocks. Default: 32 KiB

	Archive bool `yaml:"archive"` // Whether or not to enforce archive mode.
	ORAM    bool `yaml:"oram"`    // Whether or not to use ORAM.
}

type ORAMConfig struct {
	Key string `yaml:"key"` // Fixed key for encrypting ORAM blocks before being sent to the remote storage provider.

	NumPtrs  int64 `yaml:"num-ptrs"`  // Should be the same as num-ptrs in the client-side config.
	DataSize int64 `yaml:"data-size"` // Should be the same as data-size in the client-side config.
}

type RemoteServer struct {
	URL          string `yaml:"url"`           // URL of server.
	TransportKey string `yaml:"transport-key"` // Pre-shared key for authenticating client and server.
}

type Server struct {
	DataDir string `yaml:"data-dir"` // Directory where the WAL and cache should be kept. Default: utahfs-data

	StorageProvider *StorageProvider `yaml:"storage-provider"`

	MaxWALSize     int    `yaml:"max-wal-size"`    // Max number of blocks to put in WAL before blocking on remote storage. Default: 320*1024 blocks
	WALParallelism int    `yaml:"wal-parallelism"` // Number of threads to use when draining the WAL. Default: 1
	DiskCacheSize  int64  `yaml:"disk-cache-size"` // Size of on-disk LRU cache. Default: 3200*1024 blocks, -1 to disable.
	DiskCacheLoc   string `yaml:"disk-cache-loc"`  // Special location for on-disk LRU cache. Default is to store cache inside data-dir.
	MemCacheSize   int    `yaml:"mem-cache-size"`  // Size of in-memory LRU cache. Default: 32*1024 blocks, -1 to disable.
	KeepMetadata   bool   `yaml:"keep-metadata"`   // Keep a local copy of metadata, always. Default: false.

	ORAM *ORAMConfig `yaml:"oram"` // Provided if ORAM should be used on the server-side.

	TransportKey string `yaml:"transport-key"` // Pre-shared key for authenticating client and server.
}

type StorageProvider struct {
	// Backblaze B2
	B2AcctId string `yaml:"b2-acct-id"`
	B2AppKey string `yaml:"b2-app-key"`
	B2Bucket string `yaml:"b2-bucket"`
	B2Url    string `yaml:"b2-url"`

	// AWS S3 and compatible APIs
	S3AppId  string `yaml:"s3-app-id"`
	S3AppKey string `yaml:"s3-app-key"`
	S3Bucket string `yaml:"s3-bucket"`
	S3Url    string `yaml:"s3-url"`
	S3Region string `yaml:"s3-region"`

	// Google Cloud Storage
	GCSBucketName      string `yaml:"gcs-bucket-name"`
	GCSCredentialsPath string `yaml:"gcs-credentials-path"`

	// Local disk storage
	DiskPath string `yaml:"disk-path"`

	Retry  int    `yaml:"retry"`  // Max number of times to retry reqs that fail.
	Prefix string `yaml:"prefix"` // Prefix to put on every key, like `folder-name/`.
}