msharee9 commented on a change in pull request #590: MINIFICPP-621 Nanofi Tailfile example URL: https://github.com/apache/nifi-minifi-cpp/pull/590#discussion_r293198512
########## File path: nanofi/examples/tail_file.c ########## @@ -0,0 +1,270 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * 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. +*/ + +#include "api/nanofi.h" +#include <unistd.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <limits.h> +#include <sys/stat.h> + +typedef struct flow_file_records { + flow_file_record ** records; + uint64_t len; +} flow_file_records; + +typedef struct file_offset { + int offset; +} file_offset; + +struct flow_file_records * flowfiles = NULL; +struct file_offset * fileoffset = NULL; +struct nifi_instance * instance = NULL; + +void transmit_flow_files(nifi_instance * instance) { + if (flowfiles) { + for (int i = 0; i < flowfiles->len; ++i) { + if (flowfiles->records[i]) { + transmit_flowfile(flowfiles->records[i], instance); + } + } + } +} + +char * get_string(char * begin, char * end) { + + if (begin == NULL || (end != NULL && end < begin)) { + return NULL; + } + + int len = 0; + char * buff = NULL; + + if (begin == end) { + buff = (char *)malloc(2 * sizeof(char)); + strncpy(buff, begin, 1); + buff[1] = '\0'; + return buff; + } + + if (end) { + len = end - begin; + buff = (char *)malloc((len+1) * sizeof(char)); + strncpy(buff, begin, len); + buff[len] = '\0'; + } + else { + len = strlen(begin); + buff = (char *)malloc((len+1) * sizeof(char)); + strncpy(buff, begin, len); + buff[len] = '\0'; + } + return buff; +} + +void split_string(char * str, char delim, char ** collector, int * num_strings) Review comment: @bakaid please review the updated changes. If we return an array of subsets wouldn't it make this function complex to use? The user of this function then has to deal with offsets if he wants to extract the strings. We can customize this function if we want to make it efficient by not duplicating the strings, but at present the usage from nanofi tailfile is to split blocks of chars of size 4KB. I don't think that is big enough to think of efficiency. As we move along and encounter use cases we will refine this function and make it efficient. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
