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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 | 1x 1x 1x 1x 1x | 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 { has, registerType } from 'vtk.js/Sources/IO/Core/DataAccessHelper';
const { vtkErrorMacro, vtkDebugMacro } = macro;
const REJECT_COMPRESSION = () => {
vtkErrorMacro(
'LiteHttpDataAccessHelper does not support compression. Need to register HttpDataAccessHelper instead.'
);
return Promise.reject(
new Error(
'LiteHttpDataAccessHelper does not support compression. Need to register HttpDataAccessHelper instead.'
)
);
};
/* eslint-disable prefer-promise-reject-errors */
let requestCount = 0;
function openAsyncXHR(method, url, options = {}) {
const xhr = new XMLHttpRequest();
xhr.open(method, url, true);
if (options.headers) {
Object.entries(options.headers).forEach(([key, value]) =>
xhr.setRequestHeader(key, value)
);
}
if (options.progressCallback) {
xhr.addEventListener('progress', options.progressCallback);
}
return xhr;
}
function fetchBinary(url, options = {}) {
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) {
resolve(xhr.response);
} else {
reject({ xhr, e });
}
}
};
// Make request
xhr.responseType = 'arraybuffer';
xhr.send();
});
}
function fetchArray(instance, baseURL, array, options = {}) {
if (options && options.compression) {
return REJECT_COMPRESSION();
}
if (array.ref && !array.ref.pending) {
return new Promise((resolve, reject) => {
const url = [baseURL, array.ref.basepath, array.ref.id].join('/');
const xhr = openAsyncXHR('GET', url, options);
xhr.onreadystatechange = (e) => {
if (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 (array.ref.encode === 'JSON') {
array.values = JSON.parse(array.buffer);
} else {
if (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);
}
if (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;
if (--requestCount === 0 && instance?.invokeBusy) {
instance.invokeBusy(false);
}
if (instance?.modified) {
instance.modified();
}
resolve(array);
} else {
reject({ xhr, e });
}
}
};
// Make request
xhr.responseType = array.dataType !== 'string' ? 'arraybuffer' : 'text';
xhr.send();
});
}
return Promise.resolve(array);
}
// ----------------------------------------------------------------------------
function fetchJSON(instance, url, options = {}) {
if (options && options.compression) {
return REJECT_COMPRESSION();
}
return new Promise((resolve, reject) => {
const xhr = openAsyncXHR('GET', url, options);
xhr.onreadystatechange = (e) => {
if (xhr.readyState === 1) {
if (++requestCount === 1 && instance?.invokeBusy) {
instance.invokeBusy(true);
}
}
if (xhr.readyState === 4) {
if (--requestCount === 0 && instance?.invokeBusy) {
instance.invokeBusy(false);
}
if (xhr.status === 200 || xhr.status === 0) {
resolve(JSON.parse(xhr.responseText));
} else {
reject({ xhr, e });
}
}
};
// Make request
xhr.responseType = 'text';
xhr.send();
});
}
// ----------------------------------------------------------------------------
function fetchText(instance, url, options = {}) {
if (options && options.compression) {
return REJECT_COMPRESSION();
}
return new Promise((resolve, reject) => {
const xhr = openAsyncXHR('GET', url, options);
xhr.onreadystatechange = (e) => {
if (xhr.readyState === 1) {
if (++requestCount === 1 && instance?.invokeBusy) {
instance.invokeBusy(true);
}
}
if (xhr.readyState === 4) {
if (--requestCount === 0 && instance?.invokeBusy) {
instance.invokeBusy(false);
}
if (xhr.status === 200 || xhr.status === 0) {
resolve(xhr.responseText);
} else {
reject({ xhr, e });
}
}
};
// Make request
xhr.responseType = '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 LiteHttpDataAccessHelper = {
fetchArray,
fetchJSON,
fetchText,
fetchBinary, // Only for HTTP
fetchImage,
};
// The lite version should never override a full feature one...
Iif (!has('http')) {
registerType('http', (options) => LiteHttpDataAccessHelper);
}
export default LiteHttpDataAccessHelper;
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