os.free nil pointer failure in ngt cgo due to create index hang up

[kpango]

Signed-off-by: kpango kpango@vdaas.org

Description:

this PR includes 2 bugfix & 2 feature
bugfix

1. os.free nil pointer failure in ngt cgo due to create index hang up
2. grpc client stream close error

feature

1. show configuration and version information on debug print when server startup
2. rewrite godoc badge.

Related Issue:

How Has This Been Tested?:

Environment:

• Go Version: 1.15.2
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.12.1

Types of changes:

• Bug fix [type/bug]
• New feature [type/feature]
• Add tests [type/test]
• Security related changes [type/security]
• Add documents [type/documentation]
• Refactoring [type/refactoring]
• Update dependencies [type/dependency]
• Update benchmarks and performances [type/bench]
• Update CI [type/ci]

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Checklist:

• I have read the CONTRIBUTING document.
• I have checked open Pull Requests for the similar feature or fixes?
• I have added tests and benchmarks to cover my changes.
• I have ensured all new and existing tests passed.
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly.

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[codecov]

Codecov Report

Merging #930 (bcfcd1d) into master (2990012) will decrease coverage by 0.09%.
The diff coverage is 18.75%.

@@            Coverage Diff             @@
##           master     #930      +/-   ##
==========================================
- Coverage   16.43%   16.33%   -0.10%     
==========================================
  Files         470      470              
  Lines       23075    23094      +19     
==========================================
- Hits         3792     3773      -19     
- Misses      19047    19079      +32     
- Partials      236      242       +6     

Impacted Files	Coverage Δ
internal/net/grpc/stream.go	0.00% <0.00%> (ø)
pkg/agent/core/ngt/service/ngt.go	0.00% <0.00%> (ø)
pkg/gateway/lb/usecase/vald.go	0.00% <ø> (ø)
internal/backoff/backoff.go	40.00% <10.00%> (-1.38%)	⬇️
internal/runner/runner.go	88.33% <54.54%> (-2.58%)	⬇️
internal/db/storage/blob/s3/reader/reader.go	63.04% <0.00%> (-31.53%)	⬇️
internal/worker/worker.go	82.29% <0.00%> (-1.05%)	⬇️
internal/errgroup/group.go	93.93% <0.00%> (+1.51%)	⬆️
internal/worker/queue.go	98.33% <0.00%> (+3.33%)	⬆️

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[rinx]

i'll check it on my local cluster.

[rinx]

doesn't work in my local environment but it may be caused by the environmental problem.

[kpango]

In addition to the comments, @rinx said, v0.0.66 also has this potential problem which we will have to check more in the environment later.