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feat(graphql): Generate fragment types from schema file
When providing Hops with a GraphQL schema file the command `hops graphql introspect` will try to generate the fragment types (required for querying fragments on unions or intersections) from the provided file. If this file does not exist, it will try to generate the fragment types by querying the GraphQL server specified via "graphqlUri".
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,49 +1,66 @@ | ||
| /* global fetch */ | ||
| 'use strict'; | ||
|
|
||
| require('isomorphic-fetch'); | ||
| var fs = require('fs'); | ||
|
|
||
| var fetch = require('isomorphic-fetch'); | ||
| var pify = require('pify'); | ||
| var graphql = require('graphql').graphql; | ||
| var makeExecutableSchema = require('graphql-tools').makeExecutableSchema; | ||
|
|
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| var hopsConfig = require('hops-config'); | ||
|
|
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| var fragmentsFile = require('./util').getFragmentsFile(); | ||
|
|
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| module.exports = function fetchFragments() { | ||
| return fetch(hopsConfig.graphqlUri, { | ||
| function writeFragmentTypesFile(result) { | ||
| result.data.__schema.types = result.data.__schema.types.filter(function(t) { | ||
| return t.possibleTypes !== null; | ||
| }); | ||
| return pify(fs.writeFile)(fragmentsFile, JSON.stringify(result.data)); | ||
| } | ||
|
|
||
| function executeRemoteQuery(graphqlUri, query) { | ||
| return fetch(graphqlUri, { | ||
| method: 'POST', | ||
| headers: { 'Content-Type': 'application/json' }, | ||
| body: JSON.stringify({ | ||
| query: [ | ||
| /* eslint-disable indent */ | ||
| ' {', | ||
| ' __schema {', | ||
| ' types {', | ||
| ' kind', | ||
| ' name', | ||
| ' possibleTypes {', | ||
| ' name', | ||
| ' }', | ||
| ' }', | ||
| ' }', | ||
| ' }', | ||
| /* eslint-enable indent */ | ||
| ].join('\n'), | ||
| }), | ||
| }) | ||
| .then(result => result.json()) | ||
| .then(result => { | ||
| var filteredData = result.data.__schema.types.filter(function(type) { | ||
| return type.possibleTypes !== null; | ||
| }); | ||
| result.data.__schema.types = filteredData; | ||
| return new Promise(function(resolve, reject) { | ||
| fs.writeFile(fragmentsFile, JSON.stringify(result.data), err => { | ||
| if (err) { | ||
| reject(err); | ||
| } else { | ||
| resolve(fragmentsFile); | ||
| } | ||
| }); | ||
| }); | ||
| body: JSON.stringify({ query: query }), | ||
| }).then(function(result) { | ||
| return result.json(); | ||
| }); | ||
| } | ||
|
|
||
| function executeLocalQuery(schemaFile, query) { | ||
| return pify(fs.readFile)(schemaFile, 'utf-8') | ||
| .then(function(schema) { | ||
| return makeExecutableSchema({ typeDefs: schema }); | ||
| }) | ||
| .then(function(executableSchema) { | ||
| return graphql(executableSchema, query); | ||
| }); | ||
| } | ||
|
|
||
| var query = [ | ||
| '{', | ||
| ' __schema {', | ||
| ' types {', | ||
| ' kind', | ||
| ' name', | ||
| ' possibleTypes {', | ||
| ' name', | ||
| ' }', | ||
| ' }', | ||
| ' }', | ||
| '}', | ||
| ].join('\n'); | ||
|
|
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| module.exports = function generateFragmentTypes() { | ||
| return pify(fs.access)(hopsConfig.graphqlSchemaFile) | ||
| .then( | ||
| function() { | ||
| return executeLocalQuery(hopsConfig.graphqlSchemaFile, query); | ||
| }, | ||
| function() { | ||
| return executeRemoteQuery(hopsConfig.graphqlUri, query); | ||
| } | ||
| ) | ||
| .then(writeFragmentTypesFile); | ||
| }; |
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