Best way to pull repeated table data from a pcap http file (could awk handle the disruptive breaks)?

Question

I am collecting data readings from my PV system. The web client will graph one day of data - I want to collect a whole year or two in one file for patterns etc. So far I capture lines into a cap file with Wireshark and just filter the data I want with headers and a few retransmitted packet. The data of interest is being sent to a js app but I want to lift out the data which repeats in each packet as date time=watts, see sample below...

I was hoping to use AWK to parse the data into an array keyed by date and time, then print it back out to a file. This gets rid of duplicates in retransmitted packets and sorts the data. I ideally I'd also remove unwanted decimal data in the watts field too.

This sample was passed through strings to remove binary data in the cap. Can awk handle that better? There are regular packet breaks that interrupt the fields at any place, in this sample with the year 2018 with the 20 being at the end of a packet and the 18 in the start of the next. The inter-line text is not consistent though there might be something more consistent in the binary file. So the rule needs to be:

• ignore until {"1":"{
• parse for 4n-2n-2n space 2n:2n space real_nb comma (ignoring any other line breaks or chars)
• stop collecting at }","0":"2018-01-01"} NB the end dates vary!

Here are 2 sample blocks. The first shows strings around a table block that has been shortened to just a few times from that day. The second block is just the full table data from a day without the context.

(I added a line break for visual separation. Note break within the 76.549995 which would be better rounded as 77)

Path=/
/[CB
$e/N
{"1":"{2018-01-08 08:50=4.5, 2018-01-08 08:55=9.5, 2018-01-08 11:30=76
/[CB
$e/QM
.549995, 2018-01-08 11:35=73.9, 2018-01-08 11:40=65.93333, 2018-01-08 15:30=2.25, 2018-01-08 15:40=0.0}","0":"2018-01-08"}
/[CB
$e/Vq
XT2P

HTTP/1.1 200 OK
{"1":"{2018-01-01 08:15=9.5, 2018-01-01 08:20=22.0, 2018-01-01 08:25=29.4, 2018-01-01 08:30=30.150002, 2018-01-01 08:35=35.3, 2018-01-01 08:40=42.0, 2018-01-01 08:45=77.5, 2018-01-01 08:50=62.6, 2018-01-01 08:55=62.6, 2018-01-01 09:00=75.4, 2018-01-01 09:05=61.199997, 2018-01-01 09:10=57.85, 2018-01-01 09:15=45.7, 2018-01-01 09:20=44.266666, 2018-01-01 09:25=47.2, 2018-01-01 09:30=46.8, 2018-01-01 09:35=53.2, 2018-01-01 09:40=58.2, 2018-01-01 09:45=55.600002, 2018-01-01 09:50=56.733337, 2018-01-01 09:55=62.0, 2018-01-01 10:00=66.3, 2018-01-01 10:05=62.466663, 2018-01-01 10:10=62.699997, 2018-01-01 10:15=70.3, 2018-01-01 10:20=87.1, 2018-01-01 10:25=88.24999, 2018-01-01 10:30=102.5, 2018-01-01 10:35=95.46667, 2018-01-01 10:40=100.73334, 2018-01-01 10:45=100.700005, 2018-01-01 10:50=102.06667, 2018-01-01 10:55=116.4, 20
/[CB
X7BP
18-01-01 11:00=126.7, 2018-01-01 11:05=125.166664, 2018-01-01 11:10=128.26666, 2018-01-01 11:15=125.43333, 2018-01-01 11:20=119.666664, 2018-01-01 11:25=116.649994, 2018-01-01 11:30=94.700005, 2018-01-01 11:35=101.7, 2018-01-01 11:40=95.13333, 2018-01-01 11:45=98.76666, 2018-01-01 11:50=98.466675, 2018-01-01 11:55=92.43334, 2018-01-01 12:00=85.96667, 2018-01-01 12:05=77.833336, 2018-01-01 12:10=75.95, 2018-01-01 12:15=67.75, 2018-01-01 12:20=57.699997, 2018-01-01 12:25=74.2, 2018-01-01 12:30=87.1, 2018-01-01 12:35=77.6, 2018-01-01 12:40=74.1, 2018-01-01 12:45=63.36667, 2018-01-01 12:50=59.300003, 2018-01-01 12:55=76.9, 2018-01-01 13:00=66.6, 2018-01-01 13:05=203.4, 2018-01-01 13:10=203.45, 2018-01-01 13:15=203.45, 2018-01-01 13:20=157.3, 2018-01-01 13:25=101.333336, 2018-01-01 13:30=96.45, 2018-01-01 13:35=81.3, 2018-01-01 13:40=93.7, 2018-01-01 13:45=127.9, 2018-01-01 13:50=176.1, 2018-01-01 13:55=152.0, 2018-01-01 14:00=169.6, 2018-01-01 14:05=203.2, 2018-01-01 14:10=257.5, 2018-01-01 14:15=261.30002, 2018-01-01 14:20=261.3, 2018-01-01 14:25=218.13335, 2018-01-01 14:30=385.5, 2018-01-01 14:35=287.5, 2018-01-01 14:40=248.35002, 2018-01-01 14:45=98.2, 2018-01-01 14:50=136.2, 2018-01-01 14:55=160.0, 2018-01-01 15:00=148.1
/[CB
X7BP
, 2018-01-01 15:05=133.59999, 2018-01-01 15:10=93.3, 2018-01-01 15:15=79.25, 2018-01-01 15:20=44.300003, 2018-01-01 15:25=36.56667, 2018-01-01 15:30=43.8, 2018-01-01 15:35=39.3, 2018-01-01 15:40=39.5, 2018-01-01 15:45=33.05, 2018-01-01 15:50=28.649998, 2018-01-01 15:55=26.65, 2018-01-01 16:00=16.55, 2018-01-01 16:05=7.5, 2018-01-01 16:10=0.0}","0":"2018-01-01"}

I will have several thousand lines of this source data and 40-100k date_time data points, can keyed arrays handle that? Should I define the comma as my line separator? (I am unsure if a comma might occur in the packet/line break texts...) Is there a better, easier solution?

At present I have been using a text editor to process a few sample months and test my analysis ideas but this is too slow and onerous for the full data set.

My ideal output looks like (different sample data from my editing)

06/11/18    11:20   799     
06/11/18    11:25   744     
06/11/18    11:30   720     
06/11/18    11:35   681     
06/11/18    11:40   543     
06/11/18    11:45   350     
06/11/18    11:50   274     
06/11/18    11:55   230     
06/11/18    12:00   286     
06/11/18    12:05   435     
06/11/18    12:10   544     
06/11/18    12:15   899     
06/11/18    12:20   1187        
06/11/18    12:25   1575        
06/11/18    12:30   1362        
06/11/18    12:35   1423        

Maybe Python is better suited but that is a bigger learning curve and lower starting knowledge point for me...

Here is my start, it gets most of the data about right BUT does not deal with a record split across 2 packets or the trailing }"

awk 'BEGIN{RS=","};  ($1~"^201"){if (NF=2) {split($2,X,"=");print $1,X[1], X[2]}}' sample.txt

outputs

2018-01-06 15:30 39.033333
2018-01-06 15:35 34.9
2018-01-06 15:40 24.25
2018-01-06 15     NB lost data at packet break as line not starting 201
2018-01-06 15:50 0.0
2018-01-06 15:55 0.0}" NB failed to remove trailer
2018-01-07 08:25 7.8
2018-01-07 08:30 23.7

Just noticed my text editing version reformatted dates as dd/mm/yy while the awk has preserved the input date format. Spreadsheets will read either so I don't care about that!

For the record just ran my awk on the binary cap file and it still seems to work in the same way as the file output by strings.

Real data, as output from strings

Mac OS X 10.11.6, build 15G22010 (Darwin 15.6.0)
Dumpcap (Wireshark) 2.6.5 (v2.6.5-0-gf766965a)
host 47.91.67.66 
Mac OS X 10.11.6, build 15G22010 (Darwin 15.6.0)
.#/[CB
HTTP/1.1 200 OK
Date: Tue, 12 Nov 2019 16:15:11 GMT
Content-Type: application/json;charset=UTF-8
Content-Length: 2432
Connection: keep-alive
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18-01-01 11:00=126.7, 2018-01-01 11:05=125.166664, 2018-01-01 11:10=128.26666, 2018-01-01 11:15=125.43333, 2018-01-01 11:20=119.666664, 2018-01-01 11:25=116.649994, 2018-01-01 11:30=94.700005, 2018-01-01 11:35=101.7, 2018-01-01 11:40=95.13333, 2018-01-01 11:45=98.76666, 2018-01-01 11:50=98.466675, 2018-01-01 11:55=92.43334, 2018-01-01 12:00=85.96667, 2018-01-01 12:05=77.833336, 2018-01-01 12:10=75.95, 2018-01-01 12:15=67.75, 2018-01-01 12:20=57.699997, 2018-01-01 12:25=74.2, 2018-01-01 12:30=87.1, 2018-01-01 12:35=77.6, 2018-01-01 12:40=74.1, 2018-01-01 12:45=63.36667, 2018-01-01 12:50=59.300003, 2018-01-01 12:55=76.9, 2018-01-01 13:00=66.6, 2018-01-01 13:05=203.4, 2018-01-01 13:10=203.45, 2018-01-01 13:15=203.45, 2018-01-01 13:20=157.3, 2018-01-01 13:25=101.333336, 2018-01-01 13:30=96.45, 2018-01-01 13:35=81.3, 2018-01-01 13:40=93.7, 2018-01-01 13:45=127.9, 2018-01-01 13:50=176.1, 2018-01-01 13:55=152.0, 2018-01-01 14:00=169.6, 2018-01-01 14:05=203.2, 2018-01-01 14:10=257.5, 2018-01-01 14:15=261.30002, 2018-01-01 14:20=261.3, 2018-01-01 14:25=218.13335, 2018-01-01 14:30=385.5, 2018-01-01 14:35=287.5, 2018-01-01 14:40=248.35002, 2018-01-01 14:45=98.2, 2018-01-01 14:50=136.2, 2018-01-01 14:55=160.0, 2018-01-01 15:00=148.1
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, 2018-01-01 15:05=133.59999, 2018-01-01 15:10=93.3, 2018-01-01 15:15=79.25, 2018-01-01 15:20=44.300003, 2018-01-01 15:25=36.56667, 2018-01-01 15:30=43.8, 2018-01-01 15:35=39.3, 2018-01-01 15:40=39.5, 2018-01-01 15:45=33.05, 2018-01-01 15:50=28.649998, 2018-01-01 15:55=26.65, 2018-01-01 16:00=16.55, 2018-01-01 16:05=7.5, 2018-01-01 16:10=0.0}","0":"2018-01-01"}
/[CB
HTTP/1.1 200 OK
Date: Tue, 12 Nov 2019 16:15:14 GMT
Content-Type: application/json;charset=UTF-8
Content-Length: 2184
Connection: keep-alive
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2t/[CB
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/[CB
X>~P```


Get the full file of a month or so data here 

`https://www.dropbox.com/s/3vb6g9ywlgt7isw/dayData2.txt?dl=1`

Answer 1

KamilCuk has provided a best solution. The first solution with a series of commands does the best job but is not convenient to use as it stands, also it will not operate on the binary cap file. The combined sed command, his solution 2, does not work so well. Probably because it works with one line pattern at a time and the multiline problems are not well catered for. Maybe it could be fixed up if the read point can be backed up a line or the residual of the last line saved and included with the next.

My own quick and lossy (more later) is a convenient one liner. It works on the binary cap file, which would allow it to accept a pipe from tcpdump or ngrep - also useful options.

Comparing my lossy solution: it lost about 1% of data points that were split across IP packets, it allowed me to also reject 1% of packets that were at the shutdown of PV system and just recording 0.0 watts.

In terms of my aims of analysing trends and probabilities in power output over times and seasons (which I will do in buckets of 15 or 30 mins, also combining days within week_from_solstice e.g. days 14-7 before and 7-14 after 21 Dec) the loss of a few readings does not matter. The removal of the zeros at day end actually improves my data analysis.

So next time I process a sample of data via IP capture I think I might use:

awk 'BEGIN{RS=","}; ($1~"^201"){if (NF=2) {split($2,X,"="); if (0+X[2] > 0) {split($1,D,"-");print D[3]"/"D[2]"/"substr(D[1],3,2),X[1], 0+X[2]}}}'

0+X[2] required since some lines end 0.0}", the calculation both gets a number 0 from this and discards the }".

If I do not want to reformat the date (Excel takes 2018-01-31) the command is simpler:

awk 'BEGIN{RS=","}; ($1~"^201"){if (NF=2) {split($2,X,"="); if (0+X[2] > 0) {print $1,X[1], 0+X[2]}}}'

The command also removes responses where the database has no data (comms were down or they purged it), the IP feed then sends "2017-12-25 10:10 null"

Answer 2

The following code that uses GNU sed with recreated input as a stream as here doc separated with END_OF_INPUT, with some comments:

cat <<'END_OF_INPUT' |
Path=/
/[CB
$e/N
{"1":"{2018-01-08 08:50=4.5, 2018-01-08 08:55=9.5, 2018-01-08 11:30=76
/[CB
$e/QM
.549995, 2018-01-08 11:35=73.9, 2018-01-08 11:40=65.93333, 2018-01-08 15:30=2.25, 2018-01-08 15:40=0.0}","0":"2018-01-08"}
/[CB
$e/Vq
XT2P

HTTP/1.1 200 OK
{"1":"{2018-01-01 08:15=9.5, 2018-01-01 08:20=22.0, 2018-01-01 08:25=29.4, 2018-01-01 08:30=30.150002, 2018-01-01 08:35=35.3, 2018-01-01 08:40=42.0, 2018-01-01 08:45=77.5, 2018-01-01 08:50=62.6, 2018-01-01 08:55=62.6, 2018-01-01 09:00=75.4, 2018-01-01 09:05=61.199997, 2018-01-01 09:10=57.85, 2018-01-01 09:15=45.7, 2018-01-01 09:20=44.266666, 2018-01-01 09:25=47.2, 2018-01-01 09:30=46.8, 2018-01-01 09:35=53.2, 2018-01-01 09:40=58.2, 2018-01-01 09:45=55.600002, 2018-01-01 09:50=56.733337, 2018-01-01 09:55=62.0, 2018-01-01 10:00=66.3, 2018-01-01 10:05=62.466663, 2018-01-01 10:10=62.699997, 2018-01-01 10:15=70.3, 2018-01-01 10:20=87.1, 2018-01-01 10:25=88.24999, 2018-01-01 10:30=102.5, 2018-01-01 10:35=95.46667, 2018-01-01 10:40=100.73334, 2018-01-01 10:45=100.700005, 2018-01-01 10:50=102.06667, 2018-01-01 10:55=116.4, 20
/[CB
X7BP
18-01-01 11:00=126.7, 2018-01-01 11:05=125.166664, 2018-01-01 11:10=128.26666, 2018-01-01 11:15=125.43333, 2018-01-01 11:20=119.666664, 2018-01-01 11:25=116.649994, 2018-01-01 11:30=94.700005, 2018-01-01 11:35=101.7, 2018-01-01 11:40=95.13333, 2018-01-01 11:45=98.76666, 2018-01-01 11:50=98.466675, 2018-01-01 11:55=92.43334, 2018-01-01 12:00=85.96667, 2018-01-01 12:05=77.833336, 2018-01-01 12:10=75.95, 2018-01-01 12:15=67.75, 2018-01-01 12:20=57.699997, 2018-01-01 12:25=74.2, 2018-01-01 12:30=87.1, 2018-01-01 12:35=77.6, 2018-01-01 12:40=74.1, 2018-01-01 12:45=63.36667, 2018-01-01 12:50=59.300003, 2018-01-01 12:55=76.9, 2018-01-01 13:00=66.6, 2018-01-01 13:05=203.4, 2018-01-01 13:10=203.45, 2018-01-01 13:15=203.45, 2018-01-01 13:20=157.3, 2018-01-01 13:25=101.333336, 2018-01-01 13:30=96.45, 2018-01-01 13:35=81.3, 2018-01-01 13:40=93.7, 2018-01-01 13:45=127.9, 2018-01-01 13:50=176.1, 2018-01-01 13:55=152.0, 2018-01-01 14:00=169.6, 2018-01-01 14:05=203.2, 2018-01-01 14:10=257.5, 2018-01-01 14:15=261.30002, 2018-01-01 14:20=261.3, 2018-01-01 14:25=218.13335, 2018-01-01 14:30=385.5, 2018-01-01 14:35=287.5, 2018-01-01 14:40=248.35002, 2018-01-01 14:45=98.2, 2018-01-01 14:50=136.2, 2018-01-01 14:55=160.0, 2018-01-01 15:00=148.1
/[CB
X7BP
, 2018-01-01 15:05=133.59999, 2018-01-01 15:10=93.3, 2018-01-01 15:15=79.25, 2018-01-01 15:20=44.300003, 2018-01-01 15:25=36.56667, 2018-01-01 15:30=43.8, 2018-01-01 15:35=39.3, 2018-01-01 15:40=39.5, 2018-01-01 15:45=33.05, 2018-01-01 15:50=28.649998, 2018-01-01 15:55=26.65, 2018-01-01 16:00=16.55, 2018-01-01 16:05=7.5, 2018-01-01 16:10=0.0}","0":"2018-01-01"}
END_OF_INPUT
# preprocessing
# ignore until {"1":"{
# stop collecting at }","0":"2018-01-01"} 
sed -E -n '/\{"1":"\{/,/\}","0":"[0-9]{4}-[0-9]{2}-[0-9]{2}"\}/p' |
# remove the /[CB + the next line + one newline more
sed -E '/\/\[CB/{N;d;n;}' |
# we shoudld get nice {"1":.....} lines here
# elements are separated by comma
# so we can just be cruel
tr ',' '\n' |
# now each line will have one date
# so for each data in line
# output it in our format(TM)
sed -E -n '
    /.*[0-9]{2}([0-9]{2})-([0-9]{2})-([0-9]{2}) ([0-9]{2}:[0-9]{2})=([0-9]*.[0-9]*).*/{
        s!!\3/\2/\1  \4  \5!
        p
    }
'

Will output:

08/01/18  08:50  4.5
08/01/18  08:55  9.5
08/01/18  11:30  76
08/01/18  11:35  73.9
08/01/18  11:40  65.93333
08/01/18  15:30  2.25
08/01/18  15:40  0.0
01/01/18  08:15  9.5
01/01/18  08:20  22.0
01/01/18  08:25  29.4
01/01/18  08:30  30.150002
01/01/18  08:35  35.3
01/01/18  08:40  42.0
01/01/18  08:45  77.5
01/01/18  08:50  62.6
01/01/18  08:55  62.6
01/01/18  09:00  75.4
01/01/18  09:05  61.199997
01/01/18  09:10  57.85
01/01/18  09:15  45.7
01/01/18  09:20  44.266666
01/01/18  09:25  47.2
01/01/18  09:30  46.8
01/01/18  09:35  53.2
01/01/18  09:40  58.2
01/01/18  09:45  55.600002
01/01/18  09:50  56.733337
01/01/18  09:55  62.0
01/01/18  10:00  66.3
01/01/18  10:05  62.466663
01/01/18  10:10  62.699997
01/01/18  10:15  70.3
01/01/18  10:20  87.1
01/01/18  10:25  88.24999
01/01/18  10:30  102.5
01/01/18  10:35  95.46667
01/01/18  10:40  100.73334
01/01/18  10:45  100.700005
01/01/18  10:50  102.06667
01/01/18  10:55  116.4
01/01/18  11:05  125.166664
01/01/18  11:10  128.26666
01/01/18  11:15  125.43333
01/01/18  11:20  119.666664
01/01/18  11:25  116.649994
01/01/18  11:30  94.700005
01/01/18  11:35  101.7
01/01/18  11:40  95.13333
01/01/18  11:45  98.76666
01/01/18  11:50  98.466675
01/01/18  11:55  92.43334
01/01/18  12:00  85.96667
01/01/18  12:05  77.833336
01/01/18  12:10  75.95
01/01/18  12:15  67.75
01/01/18  12:20  57.699997
01/01/18  12:25  74.2
01/01/18  12:30  87.1
01/01/18  12:35  77.6
01/01/18  12:40  74.1
01/01/18  12:45  63.36667
01/01/18  12:50  59.300003
01/01/18  12:55  76.9
01/01/18  13:00  66.6
01/01/18  13:05  203.4
01/01/18  13:10  203.45
01/01/18  13:15  203.45
01/01/18  13:20  157.3
01/01/18  13:25  101.333336
01/01/18  13:30  96.45
01/01/18  13:35  81.3
01/01/18  13:40  93.7
01/01/18  13:45  127.9
01/01/18  13:50  176.1
01/01/18  13:55  152.0
01/01/18  14:00  169.6
01/01/18  14:05  203.2
01/01/18  14:10  257.5
01/01/18  14:15  261.30002
01/01/18  14:20  261.3
01/01/18  14:25  218.13335
01/01/18  14:30  385.5
01/01/18  14:35  287.5
01/01/18  14:40  248.35002
01/01/18  14:45  98.2
01/01/18  14:50  136.2
01/01/18  14:55  160.0
01/01/18  15:00  148.1
01/01/18  15:05  133.59999
01/01/18  15:10  93.3
01/01/18  15:15  79.25
01/01/18  15:20  44.300003
01/01/18  15:25  36.56667
01/01/18  15:30  43.8
01/01/18  15:35  39.3
01/01/18  15:40  39.5
01/01/18  15:45  33.05
01/01/18  15:50  28.649998
01/01/18  15:55  26.65
01/01/18  16:00  16.55
01/01/18  16:05  7.5
01/01/18  16:10  0.0

In one command with GNU sed that supports \n as a newline:

sed -E -n '
    /\{"1":"\{/,/\}","0":"[0-9]{4}-[0-9]{2}-[0-9]{2}"\}/{
      # remove the /[CB + the next line + one newline more
      /\/\[CB/{N;d;n;}

      : loop
     /([^\n]*)[0-9]{2}([0-9]{2})-([0-9]{2})-([0-9]{2}) ([0-9]{2}:[0-9]{2})=([0-9]*.[0-9]*)([^\n]*)/{
        # put the interesting string on the end of the pattern space
        s!!\1\7\n\4/\3/\2  \5  \6!
        # again, until nothing interesting is found
        b loop
    }
    # remove everything in front of the newline that we did not parse
    s/[^\n]*\n//
    # output
    p
} '