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| 1 | +import { isAsyncIterable, Plugin } from '@envelop/core' |
| 2 | +import { DirectiveNode, GraphQLError, Kind, visit } from 'graphql' |
| 3 | +import { Repeater } from '@repeaterjs/repeater' |
| 4 | +import { mergeSchemas } from '@graphql-tools/schema' |
| 5 | + |
| 6 | +export default function usePollingLive({ config: { defaultInterval = 1000 } = {} } = {}): Plugin<{}> { |
| 7 | + return { |
| 8 | + onSchemaChange({ schema, replaceSchema }) { |
| 9 | + if (!schema.getDirective('live')) { |
| 10 | + replaceSchema( |
| 11 | + mergeSchemas({ |
| 12 | + schemas: [schema], |
| 13 | + typeDefs: /* GraphQL */ ` |
| 14 | + directive @live(interval: Int) on QUERY |
| 15 | + `, |
| 16 | + }), |
| 17 | + ) |
| 18 | + } |
| 19 | + }, |
| 20 | + onExecute({ args, executeFn, setExecuteFn }) { |
| 21 | + let liveDirectiveNode: DirectiveNode | undefined |
| 22 | + args.document = visit(args.document, { |
| 23 | + OperationDefinition(node) { |
| 24 | + if (args.operationName != null && node.name?.value !== args.operationName) { |
| 25 | + return |
| 26 | + } |
| 27 | + const directives: DirectiveNode[] = [] |
| 28 | + if (node.directives && node.operation === 'query') { |
| 29 | + for (const directive of node.directives) { |
| 30 | + if (directive.name.value === 'live') { |
| 31 | + liveDirectiveNode = directive |
| 32 | + } else { |
| 33 | + directives.push(directive) |
| 34 | + } |
| 35 | + } |
| 36 | + return { |
| 37 | + ...node, |
| 38 | + directives, |
| 39 | + } |
| 40 | + } |
| 41 | + return node |
| 42 | + }, |
| 43 | + }) |
| 44 | + if (liveDirectiveNode) { |
| 45 | + const intervalArgNode = liveDirectiveNode.arguments?.find((argNode) => argNode.name.value === 'interval') |
| 46 | + let intervalMs = defaultInterval |
| 47 | + if (intervalArgNode?.value?.kind === Kind.INT) { |
| 48 | + intervalMs = parseInt(intervalArgNode.value.value) |
| 49 | + } |
| 50 | + |
| 51 | + setExecuteFn( |
| 52 | + (args) => |
| 53 | + new Repeater((push, stop) => { |
| 54 | + let finished = false |
| 55 | + async function pump() { |
| 56 | + if (finished) { |
| 57 | + return |
| 58 | + } |
| 59 | + const result: any = await executeFn(args) |
| 60 | + if (isAsyncIterable(result)) { |
| 61 | + push({ |
| 62 | + data: null, |
| 63 | + errors: [new GraphQLError('Execution returned AsyncIterable which is not supported!')], |
| 64 | + isLive: true, |
| 65 | + }) |
| 66 | + stop() |
| 67 | + return |
| 68 | + } |
| 69 | + result.isLive = true |
| 70 | + if (finished) { |
| 71 | + return |
| 72 | + } |
| 73 | + push(result) |
| 74 | + setTimeout(pump, intervalMs) |
| 75 | + } |
| 76 | + pump() |
| 77 | + stop.then(() => { |
| 78 | + finished = true |
| 79 | + }) |
| 80 | + }) as any, |
| 81 | + ) |
| 82 | + } |
| 83 | + }, |
| 84 | + } |
| 85 | +} |
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