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import OmFileFormat
import NIOConcurrencyHelpers
import Vapor
import NIO
enum OmFileManagerType: String {
case chunk
case year
case master
case linear_bias_seasonal
}
enum OmFileManagerReadable: Hashable {
case domainChunk(domain: DomainRegistry, variable: String, type: OmFileManagerType, chunk: Int?, ensembleMember: Int, previousDay: Int)
case staticFile(domain: DomainRegistry, variable: String, chunk: Int? = nil)
case meta(domain: DomainRegistry)
/// Assemble the full file system path
func getFilePath() -> String {
return "\(OpenMeteo.dataDirectory)\(getRelativeFilePath())"
}
private func getRelativeFilePath() -> String {
switch self {
case .domainChunk(let domain, let variable, let type, let chunk, let ensembleMember, let previousDay):
let ensembleMember = ensembleMember > 0 ? "_member\(ensembleMember.zeroPadded(len: 2))" : ""
let previousDay = previousDay > 0 ? "_previous_day\(previousDay)" : ""
if let chunk {
return "\(domain.rawValue)/\(variable)\(previousDay)\(ensembleMember)/\(type)_\(chunk).om"
}
return "\(domain.rawValue)/\(variable)\(previousDay)\(ensembleMember)/\(type).om"
case .staticFile(let domain, let variable, let chunk):
if let chunk {
// E.g. DEM model '/copernicus_dem90/static/lat_-1.om'
return "\(domain.rawValue)/static/\(variable)_\(chunk).om"
}
return "\(domain.rawValue)/static/\(variable).om"
case .meta(let domain):
return "\(domain.rawValue)/static/meta.json"
}
}
func createDirectory(dataDirectory: String = OpenMeteo.dataDirectory) throws {
let file = getRelativeFilePath()
guard let last = file.lastIndex(of: "/") else {
return
}
let path = "\(dataDirectory)\(file[file.startIndex..<last])"
try FileManager.default.createDirectory(atPath: path, withIntermediateDirectories: true)
}
func openRead() throws -> OmFileReaderArray<MmapFile, Float>? {
let file = getFilePath()
guard FileManager.default.fileExists(atPath: file) else {
return nil
}
guard let reader = try OmFileReader(file: file).asArray(of: Float.self) else {
return nil
}
return reader
}
func openRead2() throws -> OmFileReader<MmapFile>? {
let file = getFilePath()
guard FileManager.default.fileExists(atPath: file) else {
return nil
}
return try OmFileReader(file: file)
}
func exists() -> Bool {
let file = getFilePath()
return FileManager.default.fileExists(atPath: file)
}
func openReadCached() throws -> OmFileReaderArray<MmapFile, Float>? {
let fileRel = getRelativeFilePath()
let file = "\(OpenMeteo.dataDirectory)\(fileRel)"
guard FileManager.default.fileExists(atPath: file) else {
return nil
}
guard let reader = try OmFileReader(file: file).asArray(of: Float.self) else {
return nil
}
return reader
}
}
/// cache file handles, background close checks
/// If a file path is missing, this information is cached and checked in the background
struct OmFileManager {
public static var instance = GenericFileManager<OmFileReaderArray<MmapFile, Float>>()
private init() {}
/// Get cached file or return nil, if the files does not exist
public static func get(_ file: OmFileManagerReadable) throws -> OmFileReaderArray<MmapFile, Float>? {
try instance.get(file)
}
}
extension OmFileReaderArray: GenericFileManagable where Backend == MmapFile, OmType == Float {
func wasDeleted() -> Bool {
self.fn.file.wasDeleted()
}
static func open(from path: OmFileManagerReadable) throws -> OmFileReaderArray<MmapFile, Float>? {
return try path.openReadCached()
}
}
extension OmFileReaderArray where OmType == Float {
/// Read interpolated between 4 points. Assuming dim0 is used for locations and dim1 is a time series
public func readInterpolated(dim0: GridPoint2DFraction, dim0Nx: Int, dim1 dim1Read: Range<Int>) throws -> [Float] {
let gridpoint = dim0.gridpoint
return try readInterpolated(
dim0X: gridpoint % dim0Nx,
dim0XFraction: dim0.xFraction,
dim0Y: gridpoint / dim0Nx,
dim0YFraction: dim0.yFraction,
dim0Nx: dim0Nx,
dim1: dim1Read
)
}
/// Read interpolated between 4 points. Assuming dim0 and dim1 are a spatial field
public func readInterpolated(pos: GridPoint2DFraction) throws -> Float {
let dims = getDimensions()
guard dims.count == 2 else {
fatalError("Dimension count must be 2")
}
return try readInterpolated(
dim0: pos.gridpoint / Int(dims[1]),
dim0Fraction: pos.yFraction,
dim1: pos.gridpoint % Int(dims[1]),
dim1Fraction: pos.xFraction
)
}
/// Read interpolated between 4 points. Assuming dim0 and dim1 are a spatial field
public func readInterpolated(dim0: Int, dim0Fraction: Float, dim1: Int, dim1Fraction: Float) throws -> Float {
let dims = getDimensions()
guard dims.count == 2 else {
throw ForecastapiError.generic(message: "Dimension count must be 2 in \(#function)")
}
// bound x and y
var dim0 = UInt64(dim0)
var dim0Fraction = dim0Fraction
if dim0 > dims[0]-2 {
dim0 = dims[0]-2
dim0Fraction = 1
}
var dim1 = UInt64(dim1)
var dim1Fraction = dim1Fraction
if dim1 > dims[1]-2 {
dim1 = dims[1]-2
dim1Fraction = 1
}
// reads 4 points at once
let points = try read(range: [dim0 ..< dim0 + 2, dim1 ..< dim1 + 2])
// interpolate linearly between
return points[0] * (1-dim0Fraction) * (1-dim1Fraction) +
points[1] * (dim0Fraction) * (1-dim1Fraction) +
points[2] * (1-dim0Fraction) * (dim1Fraction) +
points[3] * (dim0Fraction) * (dim1Fraction)
}
/// Read interpolated between 4 points. Assuming dim0 is used for locations and dim1 is a time series
public func readInterpolated(dim0X: Int, dim0XFraction: Float, dim0Y: Int, dim0YFraction: Float, dim0Nx: Int, dim1 dim1Read: Range<Int>) throws -> [Float] {
let dims = getDimensions()
guard dims.count == 2 || dims.count == 3 else {
throw ForecastapiError.generic(message: "Dimension count must be 2 or 3 in \(#function)")
}
// bound x and y
var dim0X = UInt64(dim0X)
let dim0Nx = UInt64(dim0Nx)
var dim0XFraction = dim0XFraction
if dim0X > dim0Nx-2 {
dim0X = dim0Nx-2
dim0XFraction = 1
}
var dim0Y = UInt64(dim0Y)
var dim0YFraction = dim0YFraction
let dim0Ny = dims[0] / dim0Nx
if dim0Y > dim0Ny-2 {
dim0Y = dim0Ny-2
dim0YFraction = 1
}
if dims.count == 2 {
// reads 4 points. As 2 points are next to each other, we can read a small row of 2 elements at once
let top = try read(range: [dim0Y * dim0Nx + dim0X ..< dim0Y * dim0Nx + dim0X + 2, dim1Read.toUInt64()])
let bottom = try read(range: [(dim0Y + 1) * dim0Nx + dim0X ..< (dim0Y + 1) * dim0Nx + dim0X + 2, dim1Read.toUInt64()])
// interpolate linearly between
let nt = dim1Read.count
return zip(zip(top[0..<nt], top[nt..<2*nt]), zip(bottom[0..<nt], bottom[nt..<2*nt])).map {
let ((a,b),(c,d)) = $0
return a * (1-dim0XFraction) * (1-dim0YFraction) +
b * (dim0XFraction) * (1-dim0YFraction) +
c * (1-dim0XFraction) * (dim0YFraction) +
d * (dim0XFraction) * (dim0YFraction)
}
}
// New 3D files use [y,x,time] and are able to read 2x2xT slices directly
let data = try read(range: [dim0Y ..< dim0Y+2, dim0X ..< dim0X+2, dim1Read.toUInt64()])
let nt = dim1Read.count
return zip(zip(data[0..<nt], data[nt..<2*nt]), zip(data[nt*2..<nt*3], data[nt*3..<nt*4])).map {
let ((a,b),(c,d)) = $0
return a * (1-dim0XFraction) * (1-dim0YFraction) +
b * (dim0XFraction) * (1-dim0YFraction) +
c * (1-dim0XFraction) * (dim0YFraction) +
d * (dim0XFraction) * (dim0YFraction)
}
}
/// Read interpolated between 4 points. If one point is NaN, ignore it.
/*public func readInterpolatedIgnoreNaN(dim0X: Int, dim0XFraction: Float, dim0Y: Int, dim0YFraction: Float, dim0Nx: Int, dim1 dim1Read: Range<Int>) throws -> [Float] {
// reads 4 points. As 2 points are next to each other, we can read a small row of 2 elements at once
let top = try read(dim0Slow: dim0Y * dim0Nx + dim0X ..< dim0Y * dim0Nx + dim0X + 2, dim1: dim1Read)
let bottom = try read(dim0Slow: (dim0Y + 1) * dim0Nx + dim0X ..< (dim0Y + 1) * dim0Nx + dim0X + 2, dim1: dim1Read)
// interpolate linearly between
let nt = dim1Read.count
return zip(zip(top[0..<nt], top[nt..<2*nt]), zip(bottom[0..<nt], bottom[nt..<2*nt])).map {
let ((a,b),(c,d)) = $0
var value: Float = 0
var weight: Float = 0
if !a.isNaN {
value += a * (1-dim0XFraction) * (1-dim0YFraction)
weight += (1-dim0XFraction) * (1-dim0YFraction)
}
if !b.isNaN {
value += b * (1-dim0XFraction) * (dim0YFraction)
weight += (1-dim0XFraction) * (dim0YFraction)
}
if !c.isNaN {
value += c * (dim0XFraction) * (1-dim0YFraction)
weight += (dim0XFraction) * (1-dim0YFraction)
}
if !d.isNaN {
value += d * (dim0XFraction) * (dim0YFraction)
weight += (dim0XFraction) * (dim0YFraction)
}
return weight > 0.001 ? value / weight : .nan
}
}*/
}
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