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import macro from 'vtk.js/Sources/macros';
import Endian from 'vtk.js/Sources/Common/Core/Endian';
import { DataTypeByteSize } from 'vtk.js/Sources/Common/Core/DataArray/Constants';
import { registerType } from 'vtk.js/Sources/IO/Core/DataAccessHelper';
const { vtkErrorMacro, vtkDebugMacro } = macro;
/* eslint-disable prefer-promise-reject-errors */
let requestCount = 0;
function openAsyncXHR(method, url, options = {}) {
const xhr = new XMLHttpRequest();
xhr.open(method, url, true);
Iif (options.headers) {
Object.entries(options.headers).forEach(([key, value]) =>
xhr.setRequestHeader(key, value)
);
}
Iif (options.progressCallback) {
xhr.addEventListener('progress', options.progressCallback);
}
return xhr;
}
function fetchBinary(url, options = {}) {
if (options && options.compression && options.compression !== 'gz') {
vtkErrorMacro('Supported algorithms are: [gz]');
vtkErrorMacro(`Unkown compression algorithm: ${options.compression}`);
}
return new Promise((resolve, reject) => {
const xhr = openAsyncXHR('GET', url, options);
xhr.onreadystatechange = (e) => {
if (xhr.readyState === 4) {
if (xhr.status === 200 || xhr.status === 0) {
if (options.compression) {
resolve(decompressSync(new Uint8Array(xhr.response)).buffer);
} else {
resolve(xhr.response);
}
} else {
reject({ xhr, e });
}
}
};
// Make request
xhr.responseType = 'arraybuffer';
xhr.send();
});
}
function fetchArray(instance, baseURL, array, options = {}) {
if (array.ref && !array.ref.pending) {
return new Promise((resolve, reject) => {
let url = null;
if (array.ref.url) {
url = array.ref.url;
} else {
url = [
baseURL,
array.ref.basepath,
options.compression ? `${array.ref.id}.gz` : array.ref.id,
].join('/');
}
const xhr = openAsyncXHR('GET', url, options);
xhr.onreadystatechange = (e) => {
Iif (xhr.readyState === 1) {
array.ref.pending = true;
if (++requestCount === 1 && instance?.invokeBusy) {
instance.invokeBusy(true);
}
}
if (xhr.readyState === 4) {
array.ref.pending = false;
if (xhr.status === 200 || xhr.status === 0) {
array.buffer = xhr.response;
if (options.compression) {
Iif (array.dataType === 'string' || array.dataType === 'JSON') {
array.buffer = strFromU8(
decompressSync(new Uint8Array(array.buffer))
);
} else {
array.buffer = decompressSync(
new Uint8Array(array.buffer)
).buffer;
}
}
Iif (array.ref.encode === 'JSON') {
array.values = JSON.parse(array.buffer);
} else {
Iif (Endian.ENDIANNESS !== array.ref.encode && Endian.ENDIANNESS) {
// Need to swap bytes
vtkDebugMacro(`Swap bytes of ${array.name}`);
Endian.swapBytes(
array.buffer,
DataTypeByteSize[array.dataType]
);
}
array.values = macro.newTypedArray(array.dataType, array.buffer);
}
Iif (array.values.length !== array.size) {
vtkErrorMacro(
`Error in FetchArray: ${array.name}, does not have the proper array size. Got ${array.values.length}, instead of ${array.size}`
);
}
// Done with the ref and work
delete array.ref;
Iif (--requestCount === 0 && instance?.invokeBusy) {
instance.invokeBusy(false);
}
if (instance?.modified) {
instance.modified();
}
resolve(array);
} else E{
reject({ xhr, e });
}
}
};
// Make request
xhr.responseType =
options.compression || array.dataType !== 'string'
? 'arraybuffer'
: 'text';
xhr.send();
});
}
return Promise.resolve(array);
}
// ----------------------------------------------------------------------------
function fetchJSON(instance, url, options = {}) {
return new Promise((resolve, reject) => {
const xhr = openAsyncXHR('GET', url, options);
xhr.onreadystatechange = (e) => {
Iif (xhr.readyState === 1) {
if (++requestCount === 1 && instance?.invokeBusy) {
instance.invokeBusy(true);
}
}
if (xhr.readyState === 4) {
Iif (--requestCount === 0 && instance?.invokeBusy) {
instance.invokeBusy(false);
}
if (xhr.status === 200 || xhr.status === 0) {
Iif (options.compression) {
resolve(
JSON.parse(
strFromU8(decompressSync(new Uint8Array(xhr.response)))
)
);
} else {
resolve(JSON.parse(xhr.responseText));
}
} else E{
reject({ xhr, e });
}
}
};
// Make request
xhr.responseType = options.compression ? 'arraybuffer' : 'text';
xhr.send();
});
}
// ----------------------------------------------------------------------------
function fetchText(instance, url, options = {}) {
Iif (options && options.compression && options.compression !== 'gz') {
vtkErrorMacro('Supported algorithms are: [gz]');
vtkErrorMacro(`Unkown compression algorithm: ${options.compression}`);
}
return new Promise((resolve, reject) => {
const xhr = openAsyncXHR('GET', url, options);
xhr.onreadystatechange = (e) => {
Iif (xhr.readyState === 1) {
if (++requestCount === 1 && instance?.invokeBusy) {
instance.invokeBusy(true);
}
}
if (xhr.readyState === 4) {
Iif (--requestCount === 0 && instance?.invokeBusy) {
instance.invokeBusy(false);
}
if (xhr.status === 200 || xhr.status === 0) {
Iif (options.compression) {
resolve(strFromU8(decompressSync(new Uint8Array(xhr.response))));
} else {
resolve(xhr.responseText);
}
} else E{
reject({ xhr, e });
}
}
};
// Make request
xhr.responseType = options.compression ? 'arraybuffer' : 'text';
xhr.send();
});
}
// ----------------------------------------------------------------------------
function fetchImage(instance, url, options = {}) {
return new Promise((resolve, reject) => {
const img = new Image();
if (options.crossOrigin) {
img.crossOrigin = options.crossOrigin;
}
img.onload = () => resolve(img);
img.onerror = reject;
img.src = url;
});
}
/* eslint-enable prefer-promise-reject-errors */
// ----------------------------------------------------------------------------
const HttpDataAccessHelper = {
fetchArray,
fetchJSON,
fetchText,
fetchBinary, // Only for HTTP
fetchImage,
};
registerType('http', (options) => HttpDataAccessHelper);
export default HttpDataAccessHelper;
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