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| 1 | +import * as devalue from 'devalue'; |
| 2 | +import { create_async_iterator } from '../../../utils/streaming.js'; |
| 3 | +import { |
| 4 | + clarify_devalue_error, |
| 5 | + get_global_name, |
| 6 | + handle_error_and_jsonify, |
| 7 | + serialize_uses |
| 8 | +} from '../utils.js'; |
| 9 | + |
| 10 | +/** |
| 11 | + * If the serialized data contains promises, `chunks` will be an |
| 12 | + * async iterable containing their resolutions |
| 13 | + * @param {import('@sveltejs/kit').RequestEvent} event |
| 14 | + * @param {import('types').RequestState} event_state |
| 15 | + * @param {import('types').SSROptions} options |
| 16 | + * @returns {import('./types.js').ServerDataSerializer} |
| 17 | + */ |
| 18 | +export function server_data_serializer(event, event_state, options) { |
| 19 | + let promise_id = 1; |
| 20 | + |
| 21 | + const iterator = create_async_iterator(); |
| 22 | + const global = get_global_name(options); |
| 23 | + |
| 24 | + /** @param {any} thing */ |
| 25 | + function replacer(thing) { |
| 26 | + if (typeof thing?.then === 'function') { |
| 27 | + const id = promise_id++; |
| 28 | + |
| 29 | + const promise = thing |
| 30 | + .then(/** @param {any} data */ (data) => ({ data })) |
| 31 | + .catch( |
| 32 | + /** @param {any} error */ async (error) => ({ |
| 33 | + error: await handle_error_and_jsonify(event, event_state, options, error) |
| 34 | + }) |
| 35 | + ) |
| 36 | + .then( |
| 37 | + /** |
| 38 | + * @param {{data: any; error: any}} result |
| 39 | + */ |
| 40 | + async ({ data, error }) => { |
| 41 | + let str; |
| 42 | + try { |
| 43 | + str = devalue.uneval(error ? [, error] : [data], replacer); |
| 44 | + } catch { |
| 45 | + error = await handle_error_and_jsonify( |
| 46 | + event, |
| 47 | + event_state, |
| 48 | + options, |
| 49 | + new Error(`Failed to serialize promise while rendering ${event.route.id}`) |
| 50 | + ); |
| 51 | + data = undefined; |
| 52 | + str = devalue.uneval([, error], replacer); |
| 53 | + } |
| 54 | + |
| 55 | + return `${global}.resolve(${id}, ${str.includes('app.decode') ? `(app) => ${str}` : `() => ${str}`})`; |
| 56 | + } |
| 57 | + ); |
| 58 | + |
| 59 | + iterator.add(promise); |
| 60 | + |
| 61 | + return `${global}.defer(${id})`; |
| 62 | + } else { |
| 63 | + for (const key in options.hooks.transport) { |
| 64 | + const encoded = options.hooks.transport[key].encode(thing); |
| 65 | + if (encoded) { |
| 66 | + return `app.decode('${key}', ${devalue.uneval(encoded, replacer)})`; |
| 67 | + } |
| 68 | + } |
| 69 | + } |
| 70 | + } |
| 71 | + |
| 72 | + const strings = /** @type {string[]} */ ([]); |
| 73 | + |
| 74 | + return { |
| 75 | + add_node(i, node) { |
| 76 | + try { |
| 77 | + if (!node) { |
| 78 | + strings[i] = 'null'; |
| 79 | + return; |
| 80 | + } |
| 81 | + |
| 82 | + /** @type {any} */ |
| 83 | + const payload = { type: 'data', data: node.data, uses: serialize_uses(node) }; |
| 84 | + if (node.slash) payload.slash = node.slash; |
| 85 | + |
| 86 | + strings[i] = devalue.uneval(payload, replacer); |
| 87 | + } catch (e) { |
| 88 | + // @ts-expect-error |
| 89 | + e.path = e.path.slice(1); |
| 90 | + throw new Error(clarify_devalue_error(event, /** @type {any} */ (e))); |
| 91 | + } |
| 92 | + }, |
| 93 | + |
| 94 | + get_data(csp) { |
| 95 | + const open = `<script${csp.script_needs_nonce ? ` nonce="${csp.nonce}"` : ''}>`; |
| 96 | + const close = `</script>\n`; |
| 97 | + |
| 98 | + return { |
| 99 | + data: `[${strings.join(',')}]`, |
| 100 | + chunks: promise_id > 1 ? iterator.iterate((str) => open + str + close) : null |
| 101 | + }; |
| 102 | + } |
| 103 | + }; |
| 104 | +} |
| 105 | + |
| 106 | +/** |
| 107 | + * If the serialized data contains promises, `chunks` will be an |
| 108 | + * async iterable containing their resolutions |
| 109 | + * @param {import('@sveltejs/kit').RequestEvent} event |
| 110 | + * @param {import('types').RequestState} event_state |
| 111 | + * @param {import('types').SSROptions} options |
| 112 | + * @returns {import('./types.js').ServerDataSerializerJson} |
| 113 | + */ |
| 114 | +export function server_data_serializer_json(event, event_state, options) { |
| 115 | + let promise_id = 1; |
| 116 | + |
| 117 | + const iterator = create_async_iterator(); |
| 118 | + |
| 119 | + const reducers = { |
| 120 | + ...Object.fromEntries( |
| 121 | + Object.entries(options.hooks.transport).map(([key, value]) => [key, value.encode]) |
| 122 | + ), |
| 123 | + /** @param {any} thing */ |
| 124 | + Promise: (thing) => { |
| 125 | + if (typeof thing?.then !== 'function') { |
| 126 | + return; |
| 127 | + } |
| 128 | + |
| 129 | + const id = promise_id++; |
| 130 | + |
| 131 | + /** @type {'data' | 'error'} */ |
| 132 | + let key = 'data'; |
| 133 | + |
| 134 | + const promise = thing |
| 135 | + .catch( |
| 136 | + /** @param {any} e */ async (e) => { |
| 137 | + key = 'error'; |
| 138 | + return handle_error_and_jsonify(event, event_state, options, /** @type {any} */ (e)); |
| 139 | + } |
| 140 | + ) |
| 141 | + .then( |
| 142 | + /** @param {any} value */ |
| 143 | + async (value) => { |
| 144 | + let str; |
| 145 | + try { |
| 146 | + str = devalue.stringify(value, reducers); |
| 147 | + } catch { |
| 148 | + const error = await handle_error_and_jsonify( |
| 149 | + event, |
| 150 | + event_state, |
| 151 | + options, |
| 152 | + new Error(`Failed to serialize promise while rendering ${event.route.id}`) |
| 153 | + ); |
| 154 | + |
| 155 | + key = 'error'; |
| 156 | + str = devalue.stringify(error, reducers); |
| 157 | + } |
| 158 | + |
| 159 | + return `{"type":"chunk","id":${id},"${key}":${str}}\n`; |
| 160 | + } |
| 161 | + ); |
| 162 | + |
| 163 | + iterator.add(promise); |
| 164 | + |
| 165 | + return id; |
| 166 | + } |
| 167 | + }; |
| 168 | + |
| 169 | + const strings = /** @type {string[]} */ ([]); |
| 170 | + |
| 171 | + return { |
| 172 | + add_node(i, node) { |
| 173 | + try { |
| 174 | + if (!node) { |
| 175 | + strings[i] = 'null'; |
| 176 | + return; |
| 177 | + } |
| 178 | + |
| 179 | + if (node.type === 'error' || node.type === 'skip') { |
| 180 | + strings[i] = JSON.stringify(node); |
| 181 | + return; |
| 182 | + } |
| 183 | + |
| 184 | + strings[i] = |
| 185 | + `{"type":"data","data":${devalue.stringify(node.data, reducers)},"uses":${JSON.stringify( |
| 186 | + serialize_uses(node) |
| 187 | + )}${node.slash ? `,"slash":${JSON.stringify(node.slash)}` : ''}}`; |
| 188 | + } catch (e) { |
| 189 | + // @ts-expect-error |
| 190 | + e.path = 'data' + e.path; |
| 191 | + throw new Error(clarify_devalue_error(event, /** @type {any} */ (e))); |
| 192 | + } |
| 193 | + }, |
| 194 | + |
| 195 | + get_data() { |
| 196 | + return { |
| 197 | + data: `{"type":"data","nodes":[${strings.join(',')}]}\n`, |
| 198 | + chunks: promise_id > 1 ? iterator.iterate() : null |
| 199 | + }; |
| 200 | + } |
| 201 | + }; |
| 202 | +} |
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