Operator tcp input adjustable buffer

[jsirianni]

Description of Changes

Added adjustable buffer size for TCP input operator. Defaults to 1MB, with a max size of 10MB. The default buffer is 64k. https://golang.org/pkg/bufio/#Scanner.Buffer

Added test cases for building the operator.

Resolves #255

Please check that the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Add a changelog entry (for non-trivial bug fixes / features)
• CI passes

[djaglowski]

Log Files	Logs / Second	CPU Avg (%)	CPU Avg Δ (%)	Memory Avg (MB)	Memory Avg Δ (MB)
1	1000	1.6724412	-0.03448713	121.6347	-3.541893
1	5000	5.913964	-0.068909645	132.15086	-2.2999725
1	10000	11.758862	+0.20689297	142.1603	+6.0841827
1	50000	58.29513	+5.223572	182.19962	+12.970352
1	100000	113.34547	+0.0850296	244.13739	+17.391968
10	100	2.1897936	+1.4781952e-05	126.34011	-0.45703125
10	500	6.6553516	-0.03447342	137.1339	+1.0538788
10	1000	13.172646	-0.67242527	141.54984	+0.13630676
10	5000	60.56173	-2.1987114	184.12137	+3.4229584
10	10000	128.77829	+3.455513	218.76186	-8.93251

[codecov]

Codecov Report

Merging #256 (bd9528e) into master (2de92df) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #256   +/-   ##
=======================================
  Coverage   71.35%   71.35%           
=======================================
  Files         102      102           
  Lines        5627     5634    +7     
=======================================
+ Hits         4015     4020    +5     
- Misses       1178     1181    +3     
+ Partials      434      433    -1     

Impacted Files	Coverage Δ
operator/builtin/input/tcp/tcp.go	68.13% <100.00%> (+2.66%)	⬆️
operator/builtin/output/otlp/otlp.go	61.73% <0.00%> (-3.70%)	⬇️
operator/builtin/output/newrelic/newrelic.go	71.96% <0.00%> (+0.93%)	⬆️

---

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[djaglowski]

Log Files	Logs / Second	CPU Avg (%)	CPU Avg Δ (%)	Memory Avg (MB)	Memory Avg Δ (MB)
1	1000	1.7586849	+0.0517565	122.53489	-2.6417007
1	5000	6.120864	+0.13799047	132.00215	-2.4486847
1	10000	11.345114	-0.20685482	141.98167	+5.9055634
1	50000	54.55223	+1.4806709	173.87029	+4.6410217
1	100000	108.69713	-4.5633087	229.77734	+3.0319214
10	100	2.3448856	+0.15510678	128.73047	+1.9333267
10	500	6.534658	-0.1551671	136.76334	+0.6833191
10	1000	12.81061	-1.034461	142.13133	+0.71780396
10	5000	62.966854	+0.20641327	185.50323	+4.804825
10	10000	116.387115	-8.935661	223.79163	-3.9027405

[djaglowski]

One minor comment, but LGTM

[djaglowski]

Log Files	Logs / Second	CPU Avg (%)	CPU Avg Δ (%)	Memory Avg (MB)	Memory Avg Δ (MB)
1	1000	1.7586473	+0.05171895	119.413925	-5.762665
1	5000	5.3276725	-0.65520096	137.24489	+2.7940521
1	10000	12.448662	+0.8966932	139.49232	+3.416214
1	50000	54.380806	+1.3092461	172.54567	+3.3164062
1	100000	109.709885	-3.5505524	227.29648	+0.5510559
10	100	2.3276963	+0.13791752	132.7931	+5.995964
10	500	7.672656	+0.982831	133.37257	-2.7074432
10	1000	13.552096	-0.29297447	145.1584	+3.744873
10	5000	65.071266	+2.3108253	182.1774	+1.4789886
10	10000	126.74573	+1.4229507	223.28152	-4.412842