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// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import { Req as PrepareConfRequest } from '../ext-plugin/a6/prepare-conf/req'
import { Resp as PrepareConfResponse } from '../ext-plugin/a6/prepare-conf/resp'
import { Req as HTTPReqCallRequest } from '../ext-plugin/a6/h-t-t-p-req-call/req'
import { Resp as HTTPReqCallResponse } from '../ext-plugin/a6/h-t-t-p-req-call/resp'
import { Stop } from '../ext-plugin/a6/h-t-t-p-req-call/stop'
import { Rewrite } from '../ext-plugin/a6/h-t-t-p-req-call/rewrite'
import { Action } from '../ext-plugin/a6/h-t-t-p-req-call/action'
import { Method } from '../ext-plugin/a6/method'
import { ByteBuffer, Builder } from 'flatbuffers'
import Runner, { Request, Response } from '../runner'
import { TextEntry } from '../ext-plugin/ext-plugin'
const RPC_ERROR = 0
const RPC_PREPARE_CONF = 1
const RPC_HTTP_REQ_CALL = 2
class RPCServer {
protected runner: Runner
constructor(runner: Runner) {
this.runner = runner
}
async dispatch(ty: number, bytes: Uint8Array) {
const builder = new Builder()
const buf = new ByteBuffer(bytes)
switch (ty) {
case RPC_PREPARE_CONF:
await this.prepareConf(buf, builder)
break
case RPC_HTTP_REQ_CALL:
await this.httpReqCall(buf, builder)
break
default:
throw new Error(`JavaScript Plugin Runner: Failed to dispatch ty ${ty}, bytes: ${bytes.length}`)
}
return builder.asUint8Array()
}
async prepareConf(buf: ByteBuffer, builder: Builder) {
const req = PrepareConfRequest.getRootAsReq(buf)
const list = [];
for (let i = 0; i < req.confLength(); i++) {
const conf = req.conf(i)
const name = conf.name()
const value = conf.value()
list.push({name, value})
}
const confToken = this.runner.prepareConf(list)
PrepareConfResponse.startResp(builder)
PrepareConfResponse.addConfToken(builder, confToken)
console.debug(`prepareConf: confToken: ${confToken}`)
builder.finish(PrepareConfResponse.endResp(builder))
}
async httpReqCall(buf: ByteBuffer, builder: Builder) {
const req = HTTPReqCallRequest.getRootAsReq(buf)
const request = {
id: req.id(),
path: req.path(),
headers: new Map(),
srcIp: [] as number[],
method: this.getMethodName(req.method()),
args: new Map()
}
for (let i = 0; i < req.srcIpLength(); i++) {
request.srcIp.push(req.srcIp(i))
}
for (let i = 0; i < req.headersLength(); i++) {
request.headers.set(req.headers(i).name(), req.headers(i).value())
}
for (let i = 0; i < req.argsLength(); i++) {
request.headers.set(req.args(i).name(), req.args(i).value())
}
const confToken = req.confToken()
const {isStop, response} = await this.runner.httpReqCall(confToken, request)
let action = isStop ? this.createStop(builder, response) : this.createRewrite(builder, request)
let actionType = isStop ? Action.Stop : Action.Rewrite
console.debug({isStop, response})
HTTPReqCallResponse.startResp(builder)
HTTPReqCallResponse.addId(builder, request.id)
HTTPReqCallResponse.addAction(builder, action)
HTTPReqCallResponse.addActionType(builder, actionType)
builder.finish(HTTPReqCallResponse.endResp(builder))
}
protected createStop(builder: Builder, response: Response) {
Eif (typeof response.body === 'string') {
response.body = Buffer.from(response.body)
}
const bodyVec = response.body && Stop.createBodyVector(builder, response.body)
const textEntries = this.mapToTextEntries(builder, response.headers)
const headerVec = response.headers && Stop.createHeadersVector(builder, textEntries)
Stop.startStop(builder)
Stop.addStatus(builder, response.status)
Eif (response.body) {
Stop.addBody(builder, bodyVec)
}
Eif (response.headers) {
Stop.addHeaders(builder, headerVec)
}
return Stop.endStop(builder)
}
protected createRewrite(builder: Builder, request: Request) {
const path = builder.createString(request.path)
const headerTextEntries = this.mapToTextEntries(builder, request.headers)
const headerVec = request.headers && Rewrite.createHeadersVector(builder, headerTextEntries)
const argsTextEntries = this.mapToTextEntries(builder, request.args)
const argsVec = request.args && Rewrite.createArgsVector(builder, argsTextEntries)
Rewrite.startRewrite(builder)
Rewrite.addPath(builder, path)
Eif (request.headers) {
Rewrite.addHeaders(builder, headerVec)
}
Eif (request.args) {
Rewrite.addArgs(builder, argsVec)
}
return Rewrite.endRewrite(builder)
}
protected mapToTextEntries(builder: Builder, m: {keys(): Iterable<string>, get(k: string): string}) {
const textEntries = []
Eif (m) {
for (let k of m.keys()) {
const name = builder.createString(k)
const value = builder.createString(m.get(k))
TextEntry.startTextEntry(builder)
TextEntry.addName(builder, name)
TextEntry.addValue(builder, value)
textEntries.push(TextEntry.endTextEntry(builder))
}
}
return textEntries
}
protected getMethodName(method: Method) {
const t = {
[Method.GET]: 'GET',
[Method.HEAD]: 'HEAD',
[Method.POST]: 'POST',
[Method.PUT]: 'PUT',
[Method.DELETE]: 'DELETE',
[Method.MKCOL]: 'MKCOL',
[Method.COPY]: 'COPY',
[Method.MOVE]: 'MOVE',
[Method.OPTIONS]: 'OPTIONS',
[Method.PROPFIND]: 'PROPFIND',
[Method.PROPPATCH]: 'PROPPATCH',
[Method.LOCK]: 'LOCK',
[Method.UNLOCK]: 'UNLOCK',
[Method.PATCH]: 'PATCH',
[Method.TRACE]: 'TRACE'
}
return t[method];
}
}
export default RPCServer |