Add script to transform tuples to human readable format

TrafficCapture/README.md

@@ -90,8 +90,45 @@ will send requests to `capture-proxy-domain.com`, using the auth combo `admin`/`
 
 Support for Sigv4 signing and other auth options may be a future option.
 
+#### Understanding Data from the Replayer
+
+The Migration Console can be used to access and help interpret the data from the replayer.
+
+The data generated from the replayer is stored on an Elastic File System volume shared between the Replayer and Migration Console.
+It is mounted to the Migration Console at the path `/shared_replayer_output`. The Replayer generates files named `output_tuples.log`.
+These files are rolled over as they hit 10 MB to a series of `output_tuples-%d{yyyy-MM-dd-HH:mm}.log` files.
+
+The data in these files is in the format of JSON lines, each of which is a log message containing a specific request-response-response tuple.
+The body of the messages is sometimes gzipped which makes it difficult to represent as text in a JSON. Therefore, the body field of all requests
+and responses is base64 encoded before it is logged. This makes the files stable, but not human-readable.
+
+We have provided a utility script that can parse these files and output them to a human-readable format: the bodies are
+base64 decoded, un-gzipped if applicable, and parsed as JSON if applicable. They're then saved back to JSON format on disk.
+
+To use this utility from the Migration Console,
+```sh
+$ ./humanReadableLogs.py --help
+usage: humanReadableLogs.py [-h] [--outfile OUTFILE] infile
+
+positional arguments:
+  infile             Path to input logged tuple file.
+
+options:
+  -h, --help         show this help message and exit
+  --outfile OUTFILE  Path for output human readable tuple file.
+
+# By default, the output file is the same path as the input file, but the file name is prefixed with `readable-`.
+$ ./humanReadableLogs.py /shared_replayer_output/tuples.log
+Input file: /shared_replayer_output/tuples.log; Output file: /shared_replayer_output/readable-tuples.log
+
+# A specific output file can also be specified.
+$ ./humanReadableLogs.py /shared_replayer_output/tuples.log --outfile local-tuples.log
+Input file: /shared_replayer_output/tuples.log; Output file: local-tuples.log
+```
+
 ### Capture Kafka Offloader
 
 The Capture Kafka Offloader will act as a Kafka Producer for offloading captured traffic logs to the configured Kafka cluster.
 
 Learn more about its functionality and setup here: [Capture Kafka Offloader](captureKafkaOffloader/README.md)
+

TrafficCapture/dockerSolution/src/main/docker/migrationConsole/Dockerfile

@@ -4,10 +4,12 @@ ENV DEBIAN_FRONTEND noninteractive
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends python3.9 python3-pip python3-dev gcc libc-dev git curl && \
-    pip3 install opensearch-benchmark
+    pip3 install urllib3==1.25.11 opensearch-benchmark==1.1.0 tqdm
 
 COPY runTestBenchmarks.sh /root/
-RUN chmod ugo+x /root/runTestBenchmarks.sh
+COPY humanReadableLogs.py /root/
+RUN chmod ug+x /root/runTestBenchmarks.sh
+RUN chmod ug+x /root/humanReadableLogs.py
 WORKDIR /root
 
 CMD tail -f /dev/null

TrafficCapture/dockerSolution/src/main/docker/migrationConsole/humanReadableLogs.py

@@ -0,0 +1,146 @@
+#!/usr/bin/env python3
+
+import argparse
+import base64
+import gzip
+import json
+import pathlib
+from typing import Optional
+import logging
+
+from tqdm import tqdm
+from tqdm.contrib.logging import logging_redirect_tqdm
+
+logger = logging.getLogger(__name__)
+
+LOG_JSON_TUPLE_FIELD = "message"
+BASE64_ENCODED_TUPLE_PATHS = ["request.body", "primaryResponse.body", "shadowResponse.body"]
+# TODO: I'm not positive about the capitalization of the Content-Encoding and Content-Type headers.
+# This version worked on my test cases, but not guaranteed to work in all cases.
+CONTENT_ENCODING_PATH = {
+    BASE64_ENCODED_TUPLE_PATHS[0]: "request.content-encoding",
+    BASE64_ENCODED_TUPLE_PATHS[1]: "primaryResponse.content-encoding",
+    BASE64_ENCODED_TUPLE_PATHS[2]: "shadowResponse.content-encoding"
+}
+CONTENT_TYPE_PATH = {
+    BASE64_ENCODED_TUPLE_PATHS[0]: "request.content-type",
+    BASE64_ENCODED_TUPLE_PATHS[1]: "primaryResponse.content-type",
+    BASE64_ENCODED_TUPLE_PATHS[2]: "shadowResponse.content-type"
+}
+CONTENT_TYPE_JSON = "application/json"
+CONTENT_ENCODING_GZIP = "gzip"
+URI_PATH = "request.Request-URI"
+BULK_URI_PATH = "_bulk"
+
+
+class DictionaryPathException(Exception):
+    pass
+
+
+def get_element(element: str, dict_: dict, raise_on_error=False) -> Optional[any]:
+    keys = element.split('.')
+    rv = dict_
+    for key in keys:
+        try:
+            rv = rv[key]
+        except KeyError:
+            if raise_on_error:
+                raise DictionaryPathException(f"Key {key} was not present.")
+            else:
+                return None
+    return rv
+
+
+def set_element(element: str, dict_: dict, value: any) -> None:
+    keys = element.split('.')
+    rv = dict_
+    for key in keys[:-1]:
+        rv = rv[key]
+    rv[keys[-1]] = value
+
+
+def parse_args():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("infile", type=pathlib.Path, help="Path to input logged tuple file.")
+    parser.add_argument("--outfile", type=pathlib.Path, help="Path for output human readable tuple file.")
+    return parser.parse_args()
+
+
+def parse_body_value(raw_value: str, content_encoding: Optional[str],
+                     content_type: Optional[str], is_bulk: bool, line_no: int):
+    try:
+        b64decoded = base64.b64decode(raw_value)
+    except Exception as e:
+        logger.error(f"Body value on line {line_no} could not be decoded: {e}. Skipping parsing body value.")
+        return None
+    is_gzipped = content_encoding is not None and content_encoding == CONTENT_ENCODING_GZIP
+    is_json = content_type is not None and CONTENT_TYPE_JSON in content_type
+    if is_gzipped:
+        try:
+            unzipped = gzip.decompress(b64decoded)
+        except Exception as e:
+            logger.error(f"Body value on line {line_no} should be gzipped but could not be unzipped: {e}. "
+                         "Skipping parsing body value.")
+            return b64decoded
+    else:
+        unzipped = b64decoded
+    try:
+        decoded = unzipped.decode("utf-8")
+    except Exception as e:
+        logger.error(f"Body value on line {line_no} could not be decoded to utf-8: {e}. "
+                     "Skipping parsing body value.")
+        return unzipped
+    if is_json and len(decoded) > 0:
+        if is_bulk:
+            try:
+                return [json.loads(line) for line in decoded.splitlines()]
+            except Exception as e:
+                logger.error("Body value on line {line_no} should be a bulk json (list of json lines) but "
+                             f"could not be parsed: {e}. Skipping parsing body value.")
+                return decoded
+        try:
+            return json.loads(decoded)
+        except Exception as e:
+            logger.error(f"Body value on line {line_no} should be a json but could not be parsed: {e}. "
+                         "Skipping parsing body value.")
+            return decoded
+    return decoded
+
+
+def parse_tuple(line: str, line_no: int) -> dict:
+    item = json.loads(line)
+    message = item[LOG_JSON_TUPLE_FIELD]
+    tuple = json.loads(message)
+    try:
+        is_bulk_path = BULK_URI_PATH in get_element(URI_PATH, tuple, raise_on_error=True)
+    except DictionaryPathException as e:
+        logger.error(f"`{URI_PATH}` on line {line_no} could not be loaded: {e} "
+                     f"Skipping parsing tuple.")
+        return tuple
+    for body_path in BASE64_ENCODED_TUPLE_PATHS:
+        base64value = get_element(body_path, tuple)
+        if base64value is None:
+            # This component has no body element, which is potentially valid.
+            continue
+        content_encoding = get_element(CONTENT_ENCODING_PATH[body_path], tuple)
+        content_type = get_element(CONTENT_TYPE_PATH[body_path], tuple)
+        value = parse_body_value(base64value, content_encoding, content_type, is_bulk_path, line_no)
+        if value:
+            set_element(body_path, tuple, value)
+    return tuple
+
+
+if __name__ == "__main__":
+    args = parse_args()
+    if args.outfile:
+        outfile = args.outfile
+    else:
+        outfile = args.infile.parent / f"readable-{args.infile.name}"
+    print(f"Input file: {args.infile}; Output file: {outfile}")
+
+    logging.basicConfig(level=logging.INFO)
+    with logging_redirect_tqdm():
+        with open(args.infile, 'r') as in_f:
+            with open(outfile, 'w') as out_f:
+                for i, line in tqdm(enumerate(in_f)):
+                    print(json.dumps(parse_tuple(line, i + 1)), file=out_f)