fgerlits commented on a change in pull request #1188:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1188#discussion_r735408467
##########
File path: PROCESSORS.md
##########
@@ -295,6 +296,29 @@ In the list below, the names of required properties appear
in bold. Any other pr
| - | - |
|success|FlowFiles that are sent successfully to the destination are
transferred to this relationship|
+## DefragmentText
+
+### Description
+
+DefragmentText splits and merges incoming flowfiles so cohesive messages are
not split between them
+### Properties
+
+In the list below, the names of required properties appear in bold. Any other
properties (not in bold) are considered optional. The table also indicates any
default values, and whether a property supports the NiFi Expression Language.
+
+| Name | Default Value | Allowable Values | Description |
+| - | - | - | - |
+|**Pattern**|||A regular expression to match at the start or end of messages.|
+|Pattern Location|Start of Message|Start of Message<br>End of Message|Whether
the pattern is located at the start or at the end of the messages.|
+|MaxBufferAge||<duration> <time unit>|The maximum age of a buffer
after which the buffer will be transferred to failure.|
+|MaxBufferSize||<size> <size unit>|The maximum buffer size, if the
buffer exceed this, it will be transferred to failure.|
+
+### Relationships
+
+| Name | Description |
+| - | - |
+|success|Flowfiles that have no fragmented messages in them|
Review comment:
"... or have been successfully defragmented"?
##########
File path: docker/test/integration/minifi/processors/DefragmentText.py
##########
@@ -0,0 +1,9 @@
+from ..core.Processor import Processor
+
+
+class DefragmentText(Processor):
+ def __init__(self, delimiter="<[0-9]+>", schedule={'scheduling period': '2
sec'}):
Review comment:
I think it would make more sense to make it event driven by default:
```suggestion
def __init__(self, delimiter="<[0-9]+>", schedule={'scheduling
strategy': 'EVENT_DRIVEN'}):
```
##########
File path: extensions/standard-processors/processors/DefragmentText.cpp
##########
@@ -0,0 +1,340 @@
+/**
+ * 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 "DefragmentText.h"
+
+#include <vector>
+
+#include "core/Resource.h"
+#include "serialization/PayloadSerializer.h"
+#include "TextFragmentUtils.h"
+#include "utils/gsl.h"
+
+namespace org::apache::nifi::minifi::processors {
+
+const core::Relationship DefragmentText::Success("success", "Flowfiles that
have no fragmented messages in them");
+const core::Relationship DefragmentText::Failure("failure", "Flowfiles that
failed the defragmentation process");
+const core::Relationship DefragmentText::Self("__self__", "Marks the FlowFile
to be owned by this processor");
+
+const core::Property DefragmentText::Pattern(
+ core::PropertyBuilder::createProperty("Pattern")
+ ->withDescription("A regular expression to match at the start or end
of messages.")
+ ->isRequired(true)->build());
+
+const core::Property DefragmentText::PatternLoc(
+ core::PropertyBuilder::createProperty("Pattern
Location")->withDescription("Whether the pattern is located at the start or at
the end of the messages.")
+ ->withAllowableValues(PatternLocation::values())
+
->withDefaultValue(toString(PatternLocation::START_OF_MESSAGE))->build());
+
+
+const core::Property DefragmentText::MaxBufferSize(
+ core::PropertyBuilder::createProperty("Max Buffer Size")
+ ->withDescription("The maximum buffer size, if the buffer exceeds
this, it will be transferred to failure. Expected format is <size> <data unit>")
+
->withType(core::StandardValidators::get().DATA_SIZE_VALIDATOR)->build());
+
+const core::Property DefragmentText::MaxBufferAge(
+ core::PropertyBuilder::createProperty("Max Buffer Age")->
+ withDescription("The maximum age of a buffer after which the buffer
will be transferred to failure. Expected format is <duration> <time
unit>")->build());
+
+void DefragmentText::initialize() {
+ setSupportedRelationships({Success, Failure});
+ setSupportedProperties({Pattern, PatternLoc, MaxBufferAge, MaxBufferSize});
+}
+
+void DefragmentText::onSchedule(core::ProcessContext* context,
core::ProcessSessionFactory*) {
+ gsl_Expects(context);
+
+ std::string max_buffer_age_str;
+ if (context->getProperty(MaxBufferAge.getName(), max_buffer_age_str)) {
+ core::TimeUnit unit;
+ uint64_t max_buffer_age;
+ if (core::Property::StringToTime(max_buffer_age_str, max_buffer_age, unit)
&& core::Property::ConvertTimeUnitToMS(max_buffer_age, unit, max_buffer_age)) {
+ buffer_.setMaxAge(std::chrono::milliseconds(max_buffer_age));
+ logger_->log_trace("The Buffer maximum age is configured to be %" PRIu64
" ms", max_buffer_age);
+ }
+ }
+
+ std::string max_buffer_size_str;
+ if (context->getProperty(MaxBufferSize.getName(), max_buffer_size_str)) {
+ uint64_t max_buffer_size =
core::DataSizeValue(max_buffer_size_str).getValue();
+ if (max_buffer_size > 0) {
+ buffer_.setMaxSize(max_buffer_size);
+ logger_->log_trace("The Buffer maximum size is configured to be %"
PRIu64 " B", max_buffer_size);
+ }
+ }
+
+ context->getProperty(PatternLoc.getName(), pattern_location_);
+
+ std::string pattern_str;
+ if (context->getProperty(Pattern.getName(), pattern_str) &&
!pattern_str.empty()) {
+ pattern_ = std::regex(pattern_str);
+ logger_->log_trace("The Pattern is configured to be %s", pattern_str);
+ } else {
+ throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Pattern property missing or
invalid");
+ }
+}
+
+void DefragmentText::onTrigger(core::ProcessContext*, core::ProcessSession*
session) {
+ gsl_Expects(session);
+ auto flowFiles = flow_file_store_.getNewFlowFiles();
+ for (auto& file : flowFiles) {
+ processNextFragment(session, file);
+ }
+ std::shared_ptr<core::FlowFile> original_flow_file = session->get();
+ processNextFragment(session, original_flow_file);
+ if (buffer_.maxAgeReached() || buffer_.maxSizeReached()) {
+ buffer_.flushAndReplace(session, Failure, nullptr);
+ }
+}
+
+void DefragmentText::processNextFragment(core::ProcessSession *session, const
std::shared_ptr<core::FlowFile>& next_fragment) {
+ if (!next_fragment)
+ return;
+ if (!buffer_.isCompatible(next_fragment)) {
+ buffer_.flushAndReplace(session, Failure, nullptr);
+ session->transfer(next_fragment, Failure);
+ return;
+ }
+ std::shared_ptr<core::FlowFile> split_before_last_pattern;
+ std::shared_ptr<core::FlowFile> split_after_last_pattern;
+ bool found_pattern = splitFlowFileAtLastPattern(session, next_fragment,
split_before_last_pattern,
+ split_after_last_pattern);
+ buffer_.append(session, split_before_last_pattern);
+ if (found_pattern) {
+ buffer_.flushAndReplace(session, Success, split_after_last_pattern);
+ }
+ session->remove(next_fragment);
+}
+
+
+void DefragmentText::updateAttributesForSplitFiles(const std::shared_ptr<const
core::FlowFile> &original_flow_file,
+ const
std::shared_ptr<core::FlowFile> &split_before_last_pattern,
+ const
std::shared_ptr<core::FlowFile> &split_after_last_pattern,
+ const size_t
split_position) const {
+ std::string base_name, post_name, offset_str;
+ if
(!original_flow_file->getAttribute(textfragmentutils::BASE_NAME_ATTRIBUTE,
base_name))
+ return;
+ if
(!original_flow_file->getAttribute(textfragmentutils::POST_NAME_ATTRIBUTE,
post_name))
+ return;
+ if (!original_flow_file->getAttribute(textfragmentutils::OFFSET_ATTRIBUTE,
offset_str))
+ return;
+
+ size_t fragment_offset = std::stoi(offset_str);
+
+ if (split_before_last_pattern) {
+ std::string first_part_name = textfragmentutils::createFileName(base_name,
post_name, fragment_offset, split_before_last_pattern->getSize());
+
split_before_last_pattern->setAttribute(core::SpecialFlowAttribute::FILENAME,
first_part_name);
+ }
+ if (split_after_last_pattern) {
+ std::string second_part_name =
textfragmentutils::createFileName(base_name, post_name, fragment_offset +
split_position, split_after_last_pattern->getSize());
+
split_after_last_pattern->setAttribute(core::SpecialFlowAttribute::FILENAME,
second_part_name);
+
split_after_last_pattern->setAttribute(textfragmentutils::OFFSET_ATTRIBUTE,
std::to_string(fragment_offset + split_position));
+ }
+}
+
+namespace {
+class AppendFlowFileToFlowFile : public OutputStreamCallback {
+ public:
+ explicit AppendFlowFileToFlowFile(const std::shared_ptr<core::FlowFile>&
flow_file_to_append, PayloadSerializer& serializer)
+ : flow_file_to_append_(flow_file_to_append), serializer_(serializer) {}
+
+ int64_t process(const std::shared_ptr<io::BaseStream> &stream) override {
+ return serializer_.serialize(flow_file_to_append_, stream);
+ }
+ private:
+ const std::shared_ptr<core::FlowFile>& flow_file_to_append_;
+ PayloadSerializer& serializer_;
+};
+
+void updateAppendedAttributes(const std::shared_ptr<core::FlowFile>&
buffered_ff) {
+ std::string base_name, post_name, offset_str;
+ if (!buffered_ff->getAttribute(textfragmentutils::BASE_NAME_ATTRIBUTE,
base_name))
+ return;
+ if (!buffered_ff->getAttribute(textfragmentutils::POST_NAME_ATTRIBUTE,
post_name))
+ return;
+ if (!buffered_ff->getAttribute(textfragmentutils::OFFSET_ATTRIBUTE,
offset_str))
+ return;
+ size_t fragment_offset = std::stoi(offset_str);
+
+ std::string buffer_new_name = textfragmentutils::createFileName(base_name,
post_name, fragment_offset, buffered_ff->getSize());
+ buffered_ff->setAttribute(core::SpecialFlowAttribute::FILENAME,
buffer_new_name);
+}
+
+class LastPatternFinder : public InputStreamCallback {
+ public:
+ LastPatternFinder(const std::regex &pattern, DefragmentText::PatternLocation
pattern_location) : pattern_(pattern), pattern_location_(pattern_location) {}
+
+ ~LastPatternFinder() override = default;
+
+ int64_t process(const std::shared_ptr<io::BaseStream> &stream) override {
+ if (nullptr == stream)
+ return 0;
+ std::string content;
+ content.resize(stream->size());
+ const auto ret = stream->read(reinterpret_cast<uint8_t *>(content.data()),
stream->size());
+ if (io::isError(ret))
+ return -1;
+ searchContent(content);
+
+ return 0;
+ }
+
+ const std::optional<size_t> &getLastPatternPosition() const { return
last_pattern_location; }
+
+ protected:
+ void searchContent(const std::string &content) {
+ auto matches_begin = std::sregex_iterator(content.begin(), content.end(),
pattern_);
+ auto number_of_matches = std::distance(matches_begin,
std::sregex_iterator());
+ if (number_of_matches > 0) {
+ auto last_match = std::next(matches_begin, number_of_matches - 1);
Review comment:
This will do the searching twice: first for `std::distance`, then for
`std::next`. It would be more efficient to iterate once in a loop and store
the latest `match_result` object.
##########
File path: extensions/standard-processors/processors/DefragmentText.cpp
##########
@@ -0,0 +1,340 @@
+/**
+ * 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 "DefragmentText.h"
+
+#include <vector>
+
+#include "core/Resource.h"
+#include "serialization/PayloadSerializer.h"
+#include "TextFragmentUtils.h"
+#include "utils/gsl.h"
+
+namespace org::apache::nifi::minifi::processors {
+
+const core::Relationship DefragmentText::Success("success", "Flowfiles that
have no fragmented messages in them");
+const core::Relationship DefragmentText::Failure("failure", "Flowfiles that
failed the defragmentation process");
+const core::Relationship DefragmentText::Self("__self__", "Marks the FlowFile
to be owned by this processor");
+
+const core::Property DefragmentText::Pattern(
+ core::PropertyBuilder::createProperty("Pattern")
+ ->withDescription("A regular expression to match at the start or end
of messages.")
+ ->isRequired(true)->build());
+
+const core::Property DefragmentText::PatternLoc(
+ core::PropertyBuilder::createProperty("Pattern
Location")->withDescription("Whether the pattern is located at the start or at
the end of the messages.")
+ ->withAllowableValues(PatternLocation::values())
+
->withDefaultValue(toString(PatternLocation::START_OF_MESSAGE))->build());
+
+
+const core::Property DefragmentText::MaxBufferSize(
+ core::PropertyBuilder::createProperty("Max Buffer Size")
+ ->withDescription("The maximum buffer size, if the buffer exceeds
this, it will be transferred to failure. Expected format is <size> <data unit>")
+
->withType(core::StandardValidators::get().DATA_SIZE_VALIDATOR)->build());
+
+const core::Property DefragmentText::MaxBufferAge(
+ core::PropertyBuilder::createProperty("Max Buffer Age")->
+ withDescription("The maximum age of a buffer after which the buffer
will be transferred to failure. Expected format is <duration> <time
unit>")->build());
+
+void DefragmentText::initialize() {
+ setSupportedRelationships({Success, Failure});
+ setSupportedProperties({Pattern, PatternLoc, MaxBufferAge, MaxBufferSize});
+}
+
+void DefragmentText::onSchedule(core::ProcessContext* context,
core::ProcessSessionFactory*) {
+ gsl_Expects(context);
+
+ std::string max_buffer_age_str;
+ if (context->getProperty(MaxBufferAge.getName(), max_buffer_age_str)) {
+ core::TimeUnit unit;
+ uint64_t max_buffer_age;
+ if (core::Property::StringToTime(max_buffer_age_str, max_buffer_age, unit)
&& core::Property::ConvertTimeUnitToMS(max_buffer_age, unit, max_buffer_age)) {
+ buffer_.setMaxAge(std::chrono::milliseconds(max_buffer_age));
+ logger_->log_trace("The Buffer maximum age is configured to be %" PRIu64
" ms", max_buffer_age);
+ }
+ }
+
+ std::string max_buffer_size_str;
+ if (context->getProperty(MaxBufferSize.getName(), max_buffer_size_str)) {
+ uint64_t max_buffer_size =
core::DataSizeValue(max_buffer_size_str).getValue();
+ if (max_buffer_size > 0) {
+ buffer_.setMaxSize(max_buffer_size);
+ logger_->log_trace("The Buffer maximum size is configured to be %"
PRIu64 " B", max_buffer_size);
+ }
+ }
+
+ context->getProperty(PatternLoc.getName(), pattern_location_);
+
+ std::string pattern_str;
+ if (context->getProperty(Pattern.getName(), pattern_str) &&
!pattern_str.empty()) {
+ pattern_ = std::regex(pattern_str);
+ logger_->log_trace("The Pattern is configured to be %s", pattern_str);
+ } else {
+ throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Pattern property missing or
invalid");
+ }
+}
+
+void DefragmentText::onTrigger(core::ProcessContext*, core::ProcessSession*
session) {
+ gsl_Expects(session);
+ auto flowFiles = flow_file_store_.getNewFlowFiles();
+ for (auto& file : flowFiles) {
+ processNextFragment(session, file);
+ }
+ std::shared_ptr<core::FlowFile> original_flow_file = session->get();
+ processNextFragment(session, original_flow_file);
+ if (buffer_.maxAgeReached() || buffer_.maxSizeReached()) {
+ buffer_.flushAndReplace(session, Failure, nullptr);
+ }
+}
+
+void DefragmentText::processNextFragment(core::ProcessSession *session, const
std::shared_ptr<core::FlowFile>& next_fragment) {
+ if (!next_fragment)
+ return;
+ if (!buffer_.isCompatible(next_fragment)) {
+ buffer_.flushAndReplace(session, Failure, nullptr);
+ session->transfer(next_fragment, Failure);
+ return;
+ }
+ std::shared_ptr<core::FlowFile> split_before_last_pattern;
+ std::shared_ptr<core::FlowFile> split_after_last_pattern;
+ bool found_pattern = splitFlowFileAtLastPattern(session, next_fragment,
split_before_last_pattern,
+ split_after_last_pattern);
+ buffer_.append(session, split_before_last_pattern);
+ if (found_pattern) {
+ buffer_.flushAndReplace(session, Success, split_after_last_pattern);
+ }
+ session->remove(next_fragment);
+}
+
+
+void DefragmentText::updateAttributesForSplitFiles(const std::shared_ptr<const
core::FlowFile> &original_flow_file,
+ const
std::shared_ptr<core::FlowFile> &split_before_last_pattern,
+ const
std::shared_ptr<core::FlowFile> &split_after_last_pattern,
+ const size_t
split_position) const {
+ std::string base_name, post_name, offset_str;
+ if
(!original_flow_file->getAttribute(textfragmentutils::BASE_NAME_ATTRIBUTE,
base_name))
+ return;
+ if
(!original_flow_file->getAttribute(textfragmentutils::POST_NAME_ATTRIBUTE,
post_name))
+ return;
+ if (!original_flow_file->getAttribute(textfragmentutils::OFFSET_ATTRIBUTE,
offset_str))
+ return;
+
+ size_t fragment_offset = std::stoi(offset_str);
+
+ if (split_before_last_pattern) {
+ std::string first_part_name = textfragmentutils::createFileName(base_name,
post_name, fragment_offset, split_before_last_pattern->getSize());
+
split_before_last_pattern->setAttribute(core::SpecialFlowAttribute::FILENAME,
first_part_name);
+ }
+ if (split_after_last_pattern) {
+ std::string second_part_name =
textfragmentutils::createFileName(base_name, post_name, fragment_offset +
split_position, split_after_last_pattern->getSize());
+
split_after_last_pattern->setAttribute(core::SpecialFlowAttribute::FILENAME,
second_part_name);
+
split_after_last_pattern->setAttribute(textfragmentutils::OFFSET_ATTRIBUTE,
std::to_string(fragment_offset + split_position));
+ }
+}
+
+namespace {
+class AppendFlowFileToFlowFile : public OutputStreamCallback {
+ public:
+ explicit AppendFlowFileToFlowFile(const std::shared_ptr<core::FlowFile>&
flow_file_to_append, PayloadSerializer& serializer)
+ : flow_file_to_append_(flow_file_to_append), serializer_(serializer) {}
+
+ int64_t process(const std::shared_ptr<io::BaseStream> &stream) override {
+ return serializer_.serialize(flow_file_to_append_, stream);
+ }
+ private:
+ const std::shared_ptr<core::FlowFile>& flow_file_to_append_;
+ PayloadSerializer& serializer_;
+};
+
+void updateAppendedAttributes(const std::shared_ptr<core::FlowFile>&
buffered_ff) {
+ std::string base_name, post_name, offset_str;
+ if (!buffered_ff->getAttribute(textfragmentutils::BASE_NAME_ATTRIBUTE,
base_name))
+ return;
+ if (!buffered_ff->getAttribute(textfragmentutils::POST_NAME_ATTRIBUTE,
post_name))
+ return;
+ if (!buffered_ff->getAttribute(textfragmentutils::OFFSET_ATTRIBUTE,
offset_str))
+ return;
+ size_t fragment_offset = std::stoi(offset_str);
+
+ std::string buffer_new_name = textfragmentutils::createFileName(base_name,
post_name, fragment_offset, buffered_ff->getSize());
+ buffered_ff->setAttribute(core::SpecialFlowAttribute::FILENAME,
buffer_new_name);
+}
+
+class LastPatternFinder : public InputStreamCallback {
Review comment:
`LastPatternFinder` does 3 things, and I think it would be better to
separate them:
1. reads the flow file into a string -- this could be done with existing
callback types
2. searches for the last occurrence of a pattern in the string -- this could
be a reusable utility function in `StringUtils`
3. computes either `match.position()` or `match.position() +
match.length()`, depending on the value of `pattern_location_` -- this logic
could be inlined into `splitFlowFileAtLastPattern()`.
This is just a suggestion, feel free to ignore it, but I think these changes
would improve the structure of the code.
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