@financialforcedev/orizuru
Version:
Streamlined communication between Heroku dynos / other worker processes
120 lines • 15.9 kB
JavaScript
;
/*
* Copyright (c) 2017-2019, FinancialForce.com, inc
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the FinancialForce.com, inc nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
/**
* @module transport/transport
*/
const avsc_1 = require("avsc");
const fs_1 = __importDefault(require("fs"));
const path_1 = require("path");
/**
* Class used to encode and decode messages using the transport schema.
*/
class Transport {
/**
* Creates a new 'Transport' which can then be used to encode and decode messages.
*/
constructor() {
// Read jn the transport schema
const schemaPath = path_1.resolve(__dirname, './transport.avsc');
const schemaBuffer = fs_1.default.readFileSync(schemaPath);
const schema = schemaBuffer.toString();
const transport = JSON.parse(schema);
// Define the transport schema as a property.
this.compiledSchema = avsc_1.Type.forSchema(transport);
}
/**
* Decode a message using the transport schema.
*
* @param schema The [Apache Avro](https://avro.apache.org/docs/current/) schema.
* @param content The buffer from which to decode the message.
*/
decode(schema, content) {
const decompiledTransportObject = this.compiledSchema.fromBuffer(content);
const compiledContextSchema = avsc_1.Type.forSchema(JSON.parse(decompiledTransportObject.contextSchema));
const compiledWriterMessageSchema = avsc_1.Type.forSchema(JSON.parse(decompiledTransportObject.messageSchema));
const resolver = schema.createResolver(compiledWriterMessageSchema);
// Create plain objects from the AVSC types.
const context = Object.assign({}, compiledContextSchema.fromBuffer(decompiledTransportObject.contextBuffer));
const message = Object.assign({}, schema.fromBuffer(decompiledTransportObject.messageBuffer, resolver));
return { context, message };
}
/**
* Encode a message using the transport schema.
*
* @param schema The [Apache Avro](https://avro.apache.org/docs/current/) schema.
* @param context The Orizuru context for this message.
* @param message The message to send.
*/
encode(schema, { context, message }) {
const validatedContextSchema = this.getContextSchema(context);
const transport = {
contextBuffer: validatedContextSchema.toBuffer(context),
contextSchema: JSON.stringify(validatedContextSchema),
messageBuffer: schema.toBuffer(message),
messageSchema: JSON.stringify(schema)
};
return this.compiledSchema.toBuffer(transport);
}
/**
* Generates the context schema for the message.
*
* This makes sure that the schema has no anonymous types.
*
* @param context The context for which to generate the schema.
*/
getContextSchema(context) {
const compiledContextSchema = avsc_1.Type.forValue(context, {
typeHook: this.getTypeHook()
});
// Validate that the schema has no anonymous types
return avsc_1.Type.forSchema(compiledContextSchema, {
noAnonymousTypes: true
});
}
/**
* Generates type names for any anonymous types.
*
* @param schema The schema for which to generate the type names.
*/
getTypeHook() {
let i = 1;
return (schema) => {
if (schema.type && (schema.type === 'enum' || schema.type === 'fixed' || schema.type === 'record') && !schema.name) {
schema.namespace = 'com.financialforce.orizuru';
schema.name = `Context${i}`;
i++;
}
return avsc_1.Type.forSchema(schema);
};
}
}
exports.Transport = Transport;
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IN NO EVENT SHALL\n *  THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,\n *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\n *  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY\n *  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\n *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n */\n\n/**\n * @module transport/transport\n */\n\nimport { ForSchemaOptions, Schema, Type } from 'avsc';\nimport fs from 'fs';\nimport { resolve } from 'path';\nimport { IOrizuruMessage } from '../..';\n\n/**\n * Class used to encode and decode messages using the transport schema.\n */\nexport class Transport {\n\n\t/**\n\t * The compiled transport [Apache Avro](https://avro.apache.org/docs/current/) schema.\n\t */\n\tprivate readonly compiledSchema: Type;\n\n\t/**\n\t * Creates a new 'Transport' which can then be used to encode and decode messages.\n\t */\n\tconstructor() {\n\n\t\t// Read jn the transport schema\n\t\tconst schemaPath = resolve(__dirname, './transport.avsc');\n\t\tconst schemaBuffer = fs.readFileSync(schemaPath);\n\t\tconst schema = schemaBuffer.toString();\n\t\tconst transport = JSON.parse(schema);\n\n\t\t// Define the transport schema as a property.\n\t\tthis.compiledSchema = Type.forSchema(transport);\n\n\t}\n\n\t/**\n\t * Decode a message using the transport schema.\n\t *\n\t * @param schema The [Apache Avro](https://avro.apache.org/docs/current/) schema.\n\t * @param content The buffer from which to decode the message.\n\t */\n\tpublic decode<C extends Orizuru.Context, M extends Orizuru.Message>(schema: Type, content: Buffer): IOrizuruMessage<C, M> {\n\n\t\tconst decompiledTransportObject: any = this.compiledSchema.fromBuffer(content);\n\n\t\tconst compiledContextSchema = Type.forSchema(JSON.parse(decompiledTransportObject.contextSchema));\n\t\tconst compiledWriterMessageSchema = Type.forSchema(JSON.parse(decompiledTransportObject.messageSchema));\n\n\t\tconst resolver = schema.createResolver(compiledWriterMessageSchema);\n\n\t\t// Create plain objects from the AVSC types.\n\t\tconst context: C = Object.assign({}, compiledContextSchema.fromBuffer(decompiledTransportObject.contextBuffer));\n\t\tconst message: M = Object.assign({}, schema.fromBuffer(decompiledTransportObject.messageBuffer, resolver));\n\n\t\treturn { context, message };\n\n\t}\n\n\t/**\n\t * Encode a message using the transport schema.\n\t *\n\t * @param schema The [Apache Avro](https://avro.apache.org/docs/current/) schema.\n\t * @param context The Orizuru context for this message.\n\t * @param message The message to send.\n\t */\n\tpublic encode<C extends Orizuru.Context, M extends Orizuru.Message>(schema: Type, { context, message }: IOrizuruMessage<C, M>) {\n\n\t\tconst validatedContextSchema = this.getContextSchema(context);\n\n\t\tconst transport = {\n\t\t\tcontextBuffer: validatedContextSchema.toBuffer(context),\n\t\t\tcontextSchema: JSON.stringify(validatedContextSchema),\n\t\t\tmessageBuffer: schema.toBuffer(message),\n\t\t\tmessageSchema: JSON.stringify(schema)\n\t\t};\n\n\t\treturn this.compiledSchema.toBuffer(transport);\n\n\t}\n\n\t/**\n\t * Generates the context schema for the message.\n\t *\n\t * This makes sure that the schema has no anonymous types.\n\t *\n\t * @param context The context for which to generate the schema.\n\t */\n\tprivate getContextSchema(context: any) {\n\n\t\tconst compiledContextSchema = Type.forValue(context, {\n\t\t\ttypeHook: this.getTypeHook()\n\t\t});\n\n\t\t// Validate that the schema has no anonymous types\n\t\treturn Type.forSchema(compiledContextSchema, {\n\t\t\tnoAnonymousTypes: true\n\t\t});\n\n\t}\n\n\t/**\n\t * Generates type names for any anonymous types.\n\t *\n\t * @param schema The schema for which to generate the type names.\n\t */\n\tprivate getTypeHook(): (schema: Schema, opts: ForSchemaOptions) => Type {\n\n\t\tlet i = 1;\n\t\treturn (schema: any) => {\n\t\t\tif (schema.type && (schema.type === 'enum' || schema.type === 'fixed' || schema.type === 'record') && !schema.name) {\n\t\t\t\tschema.namespace = 'com.financialforce.orizuru';\n\t\t\t\tschema.name = `Context${i}`;\n\t\t\t\ti++;\n\t\t\t}\n\t\t\treturn Type.forSchema(schema);\n\t\t};\n\t}\n\n}\n"]}