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homework-jianmu/source/libs/function/src/udfd.c

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/*
* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
*
* This program is free software: you can use, redistribute, and/or modify
* it under the terms of the GNU Affero General Public License, version 3
* or later ("AGPL"), as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "uv.h"
#include "os.h"
#include "tlog.h"
#include "tudf.h"
#include "tudfInt.h"
static uv_loop_t *loop;
typedef struct SUdfdUvConn {
uv_stream_t *client;
char *inputBuf;
int32_t inputLen;
int32_t inputCap;
int32_t inputTotal;
} SUdfdUvConn;
typedef struct SUvUdfWork {
uv_stream_t *client;
uv_buf_t input;
uv_buf_t output;
} SUvUdfWork;
typedef struct SUdf {
int32_t refCount;
char name[16];
int8_t type;
uv_lib_t lib;
TUdfFunc normalFunc;
} SUdf;
//TODO: low priority: change name onxxx to xxxCb, and udfc or udfd as prefix
//TODO: add private udf structure.
typedef struct SUdfHandle {
SUdf *udf;
} SUdfHandle;
void udfdProcessRequest(uv_work_t *req) {
SUvUdfWork *uvUdf = (SUvUdfWork *) (req->data);
SUdfRequest *request = NULL;
decodeRequest(uvUdf->input.base, uvUdf->input.len, &request);
switch (request->type) {
case UDF_TASK_SETUP: {
debugPrint("%s", "process setup request");
SUdf *udf = taosMemoryMalloc(sizeof(SUdf));
udf->refCount = 0;
SUdfSetupRequest *setup = request->subReq;
strcpy(udf->name, setup->udfName);
int err = uv_dlopen(setup->path, &udf->lib);
if (err != 0) {
debugPrint("can not load library %s. error: %s", setup->path, uv_strerror(err));
//TODO set error
}
char normalFuncName[32] = {0};
strcpy(normalFuncName, setup->udfName);
//TODO error,
//TODO find all functions normal, init, destroy, normal, merge, finalize
uv_dlsym(&udf->lib, normalFuncName, (void **) (&udf->normalFunc));
SUdfHandle *handle = taosMemoryMalloc(sizeof(SUdfHandle));
handle->udf = udf;
udf->refCount++;
//TODO: allocate private structure and call init function and set it to handle
SUdfResponse *rsp = taosMemoryMalloc(sizeof(SUdfResponse));
rsp->seqNum = request->seqNum;
rsp->type = request->type;
rsp->code = 0;
SUdfSetupResponse *subRsp = taosMemoryMalloc(sizeof(SUdfSetupResponse));
subRsp->udfHandle = (int64_t) (handle);
rsp->subRsp = subRsp;
char *buf;
int32_t len;
encodeResponse(&buf, &len, rsp);
uvUdf->output = uv_buf_init(buf, len);
taosMemoryFree(rsp->subRsp);
taosMemoryFree(rsp);
taosMemoryFree(request->subReq);
taosMemoryFree(request);
taosMemoryFree(uvUdf->input.base);
break;
}
case UDF_TASK_CALL: {
debugPrint("%s", "process call request");
SUdfCallRequest *call = request->subReq;
SUdfHandle *handle = (SUdfHandle *) (call->udfHandle);
SUdf *udf = handle->udf;
char *newState;
int32_t newStateSize;
SUdfDataBlock input = {.data = call->input, .size= call->inputBytes};
SUdfDataBlock output;
//TODO: call different functions according to the step
udf->normalFunc(call->step, call->state, call->stateBytes, input, &newState, &newStateSize, &output);
SUdfResponse *rsp = taosMemoryMalloc(sizeof(SUdfResponse));
rsp->seqNum = request->seqNum;
rsp->type = request->type;
rsp->code = 0;
SUdfCallResponse *subRsp = taosMemoryMalloc(sizeof(SUdfCallResponse));
subRsp->outputBytes = output.size;
subRsp->output = output.data;
subRsp->newStateBytes = newStateSize;
subRsp->newState = newState;
rsp->subRsp = subRsp;
char *buf;
int32_t len;
encodeResponse(&buf, &len, rsp);
uvUdf->output = uv_buf_init(buf, len);
taosMemoryFree(rsp->subRsp);
taosMemoryFree(rsp);
taosMemoryFree(newState);
taosMemoryFree(output.data);
taosMemoryFree(request->subReq);
taosMemoryFree(request);
taosMemoryFree(uvUdf->input.base);
break;
}
case UDF_TASK_TEARDOWN: {
debugPrint("%s", "process teardown request");
SUdfTeardownRequest *teardown = request->subReq;
SUdfHandle *handle = (SUdfHandle *) (teardown->udfHandle);
SUdf *udf = handle->udf;
udf->refCount--;
if (udf->refCount == 0) {
uv_dlclose(&udf->lib);
}
taosMemoryFree(udf);
//TODO: call destroy and free udf private
taosMemoryFree(handle);
SUdfResponse *rsp = taosMemoryMalloc(sizeof(SUdfResponse));
rsp->seqNum = request->seqNum;
rsp->type = request->type;
rsp->code = 0;
SUdfTeardownResponse *subRsp = taosMemoryMalloc(sizeof(SUdfTeardownResponse));
rsp->subRsp = subRsp;
char *buf;
int32_t len;
encodeResponse(&buf, &len, rsp);
uvUdf->output = uv_buf_init(buf, len);
taosMemoryFree(rsp->subRsp);
taosMemoryFree(rsp);
taosMemoryFree(request->subReq);
taosMemoryFree(request);
taosMemoryFree(uvUdf->input.base);
break;
}
default: {
break;
}
}
}
void udfdOnWrite(uv_write_t *req, int status) {
debugPrint("%s", "after writing to pipe");
if (status < 0) {
debugPrint("Write error %s", uv_err_name(status));
}
SUvUdfWork *work = (SUvUdfWork *) req->data;
debugPrint("\tlength: %zu", work->output.len);
taosMemoryFree(work->output.base);
taosMemoryFree(work);
taosMemoryFree(req);
}
void udfdSendResponse(uv_work_t *work, int status) {
debugPrint("%s", "send response");
SUvUdfWork *udfWork = (SUvUdfWork *) (work->data);
uv_write_t *write_req = taosMemoryMalloc(sizeof(uv_write_t));
write_req->data = udfWork;
uv_write(write_req, udfWork->client, &udfWork->output, 1, udfdOnWrite);
taosMemoryFree(work);
}
void udfdAllocBuffer(uv_handle_t *handle, size_t suggestedSize, uv_buf_t *buf) {
debugPrint("%s", "allocate buffer for read");
SUdfdUvConn *ctx = handle->data;
int32_t msgHeadSize = sizeof(int32_t) + sizeof(int64_t);
if (ctx->inputCap == 0) {
ctx->inputBuf = taosMemoryMalloc(msgHeadSize);
if (ctx->inputBuf) {
ctx->inputLen = 0;
ctx->inputCap = msgHeadSize;
ctx->inputTotal = -1;
buf->base = ctx->inputBuf;
buf->len = ctx->inputCap;
} else {
//TODO: log error
buf->base = NULL;
buf->len = 0;
}
} else {
ctx->inputCap = ctx->inputTotal > ctx->inputCap ? ctx->inputTotal : ctx->inputCap;
void *inputBuf = taosMemoryRealloc(ctx->inputBuf, ctx->inputCap);
if (inputBuf) {
ctx->inputBuf = inputBuf;
buf->base = ctx->inputBuf + ctx->inputLen;
buf->len = ctx->inputCap - ctx->inputLen;
} else {
//TODO: log error
buf->base = NULL;
buf->len = 0;
}
}
debugPrint("\tinput buf cap - len - total : %d - %d - %d", ctx->inputCap, ctx->inputLen, ctx->inputTotal);
}
bool isUdfdUvMsgComplete(SUdfdUvConn *pipe) {
if (pipe->inputTotal == -1 && pipe->inputLen >= sizeof(int32_t)) {
pipe->inputTotal = *(int32_t *) (pipe->inputBuf);
}
if (pipe->inputLen == pipe->inputCap && pipe->inputTotal == pipe->inputCap) {
return true;
}
return false;
}
void udfdHandleRequest(SUdfdUvConn *conn) {
uv_work_t *work = taosMemoryMalloc(sizeof(uv_work_t));
SUvUdfWork *udfWork = taosMemoryMalloc(sizeof(SUvUdfWork));
udfWork->client = conn->client;
udfWork->input = uv_buf_init(conn->inputBuf, conn->inputLen);
conn->inputBuf = NULL;
conn->inputLen = 0;
conn->inputCap = 0;
conn->inputTotal = -1;
work->data = udfWork;
uv_queue_work(loop, work, udfdProcessRequest, udfdSendResponse);
}
void udfdPipeCloseCb(uv_handle_t *pipe) {
SUdfdUvConn *conn = pipe->data;
taosMemoryFree(conn->client);
taosMemoryFree(conn->inputBuf);
taosMemoryFree(conn);
}
void udfdUvHandleError(SUdfdUvConn *conn) {
uv_close((uv_handle_t *) conn->client, udfdPipeCloseCb);
}
void udfdPipeRead(uv_stream_t *client, ssize_t nread, const uv_buf_t *buf) {
debugPrint("%s, nread: %zd", "read from pipe", nread);
if (nread == 0) return;
SUdfdUvConn *conn = client->data;
if (nread > 0) {
conn->inputLen += nread;
if (isUdfdUvMsgComplete(conn)) {
udfdHandleRequest(conn);
} else {
//log error or continue;
}
return;
}
if (nread < 0) {
debugPrint("Read error %s", uv_err_name(nread));
if (nread == UV_EOF) {
//TODO check more when close
} else {
}
udfdUvHandleError(conn);
}
}
void udfdOnNewConnection(uv_stream_t *server, int status) {
debugPrint("%s", "on new connection");
if (status < 0) {
// TODO
return;
}
uv_pipe_t *client = (uv_pipe_t *) taosMemoryMalloc(sizeof(uv_pipe_t));
uv_pipe_init(loop, client, 0);
if (uv_accept(server, (uv_stream_t *) client) == 0) {
SUdfdUvConn *ctx = taosMemoryMalloc(sizeof(SUdfdUvConn));
ctx->client = (uv_stream_t *) client;
ctx->inputBuf = 0;
ctx->inputLen = 0;
ctx->inputCap = 0;
client->data = ctx;
ctx->client = (uv_stream_t *) client;
uv_read_start((uv_stream_t *) client, udfdAllocBuffer, udfdPipeRead);
} else {
uv_close((uv_handle_t *) client, NULL);
}
}
void removeListeningPipe(int sig) {
uv_fs_t req;
uv_fs_unlink(loop, &req, "udf.sock", NULL);
exit(0);
}
int main() {
debugPrint("libuv version: %x", UV_VERSION_HEX);
loop = uv_default_loop();
uv_fs_t req;
uv_fs_unlink(loop, &req, "udf.sock", NULL);
uv_pipe_t server;
uv_pipe_init(loop, &server, 0);
signal(SIGINT, removeListeningPipe);
int r;
if ((r = uv_pipe_bind(&server, "udf.sock"))) {
debugPrint("Bind error %s\n", uv_err_name(r));
removeListeningPipe(0);
return 1;
}
if ((r = uv_listen((uv_stream_t *) &server, 128, udfdOnNewConnection))) {
debugPrint("Listen error %s", uv_err_name(r));
return 2;
}
uv_run(loop, UV_RUN_DEFAULT);
uv_loop_close(loop);
}
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