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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const { extend } = require("resource://devtools/shared/extend.js");
var {
findPlaceholders,
getPath,
} = require("resource://devtools/shared/protocol/utils.js");
var { types } = require("resource://devtools/shared/protocol/types.js");
/**
* Manages a request template.
*
* @param object template
* The request template.
* @construcor
*/
var Request = function(template = {}) {
this.type = template.type;
this.template = template;
this.args = findPlaceholders(template, Arg);
};
Request.prototype = {
/**
* Write a request.
*
* @param array fnArgs
* The function arguments to place in the request.
* @param object ctx
* The object making the request.
* @returns a request packet.
*/
write(fnArgs, ctx) {
const ret = {};
for (const key in this.template) {
const value = this.template[key];
if (value instanceof Arg) {
ret[key] = value.write(
value.index in fnArgs ? fnArgs[value.index] : undefined,
ctx,
key
);
} else if (key == "type") {
ret[key] = value;
} else {
throw new Error(
"Request can only an object with `Arg` or `Option` properties"
);
}
}
return ret;
},
/**
* Read a request.
*
* @param object packet
* The request packet.
* @param object ctx
* The object making the request.
* @returns an arguments array
*/
read(packet, ctx) {
const fnArgs = [];
for (const templateArg of this.args) {
const arg = templateArg.placeholder;
const path = templateArg.path;
const name = path[path.length - 1];
arg.read(getPath(packet, path), ctx, fnArgs, name);
}
return fnArgs;
},
};
exports.Request = Request;
/**
* Request/Response templates and generation
*
* Request packets are specified as json templates with
* Arg and Option placeholders where arguments should be
* placed.
*
* Reponse packets are also specified as json templates,
* with a RetVal placeholder where the return value should be
* placed.
*/
/**
* Placeholder for simple arguments.
*
* @param number index
* The argument index to place at this position.
* @param type type
* The argument should be marshalled as this type.
* @constructor
*/
var Arg = function(index, type) {
this.index = index;
// Prevent force loading all Arg types by accessing it only when needed
loader.lazyGetter(this, "type", function() {
return types.getType(type);
});
};
Arg.prototype = {
write(arg, ctx) {
return this.type.write(arg, ctx);
},
read(v, ctx, outArgs) {
outArgs[this.index] = this.type.read(v, ctx);
},
};
// Outside of protocol.js, Arg is called as factory method, without the new keyword.
exports.Arg = function(index, type) {
return new Arg(index, type);
};
/**
* Placeholder for an options argument value that should be hoisted
* into the packet.
*
* If provided in a method specification:
*
* { optionArg: Option(1)}
*
* Then arguments[1].optionArg will be placed in the packet in this
* value's place.
*
* @param number index
* The argument index of the options value.
* @param type type
* The argument should be marshalled as this type.
* @constructor
*/
var Option = function(index, type) {
Arg.call(this, index, type);
};
Option.prototype = extend(Arg.prototype, {
write(arg, ctx, name) {
// Ignore if arg is undefined or null; allow other falsy values
if (arg == undefined || arg[name] == undefined) {
return undefined;
}
const v = arg[name];
return this.type.write(v, ctx);
},
read(v, ctx, outArgs, name) {
if (outArgs[this.index] === undefined) {
outArgs[this.index] = {};
}
if (v === undefined) {
return;
}
outArgs[this.index][name] = this.type.read(v, ctx);
},
});
// Outside of protocol.js, Option is called as factory method, without the new keyword.
exports.Option = function(index, type) {
return new Option(index, type);
};
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