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generator.ts
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generator.ts
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import _ = require("lodash");
import fs = require("fs");
import dsk = require("path");
import yaml = require("js-yaml");
export interface HttpEvent {
http: {
method: string;
path: string;
};
}
export interface Definition {
handler: string;
events: Array<HttpEvent>;
}
function log(s: string) {
console.info(s);
}
export function bindLog(fn: { (msg: string): void }) {
this.log = fn;
}
export function definition(
handler: string,
url: string,
method: string
): Definition {
return {
handler: `${handler}`,
events: [httpEvent(url, method)]
};
}
export function handler(namespace: string, name: string, dir: string) {
let result = `${name}.main`;
if (namespace == "") {
if (dir) return dsk.join(dir, result);
else return result;
} else {
if (dir) return dsk.join(namespace, dir, result);
else return dsk.join(namespace, result);
}
}
export function httpEvent(url: string, method: string): HttpEvent {
return {
http: {
method: method,
path: url
}
};
}
export function name(url: string, method: string) {
let m = _.upperFirst(method);
// let n = url.replace(/{(.*?)}/g, '');
return _.camelCase(`${m} ${url}`);
}
export function src(name: string) {
return `\n\
module.exports.main = (event, context, callback) => {\n\
const response = {\n\
statusCode: 200,\n\
body: JSON.stringify({\n\
name: '${name}'\n\
}),\n\
};\n\
callback(null, response);\n\
};`;
}
export function writeHandler(path: string, name: string, dir: string) {
let file = "";
if (dir) {
dir = dsk.join(path, dir);
if (!fs.existsSync(dir)) {
fs.mkdirSync(dir);
}
file = dsk.join(dir, name + ".js");
} else {
file = path + "/" + name + ".js";
}
if (fs.existsSync(file)) {
log("Function handler exists " + name);
} else {
log("Creating function handler " + name);
fs.writeFileSync(file, src(name));
}
}
export function generate(
swaggerPaths: any,
namespace: string,
outputPath: string
): { [fn: string]: Definition } {
let functions: { [key: string]: any } = {};
_.each(swaggerPaths, (path: Array<any>, url: string) => {
_.each(path, (options, method: string) => {
let dir = _.camelCase(options ? options.tags[0] : null);
let fn = name(url, method);
let hn = handler(namespace, fn, dir);
let def = definition(hn, url, method);
writeHandler(outputPath, fn, dir);
functions[fn] = def;
});
});
return functions;
}
export function mapDefinitionEvent(definition: Definition, event: HttpEvent) {
let match = _.find(definition.events, e => {
return e.hasOwnProperty("http");
});
if (match) {
let index = _.indexOf(definition.events, match);
definition.events.splice(index, 1, event);
} else {
definition.events.push(event);
}
return definition;
}
export function map(swaggerPaths: any, functions: any) {
let definitions = _.clone(functions);
_.each(swaggerPaths, (path: Array<any>, url: string) => {
_.each(path, (options, method: string) => {
let fn = name(url, method);
let definition = definitions[fn];
if (!definition) {
log(`Missing Handler: ${fn}`);
return false;
}
let event = httpEvent(url, method);
definitions[fn] = mapDefinitionEvent(definition, event);
log(`Mapped Handler: ${fn} - ${method} - ${url}`);
});
});
return definitions;
}