[network] grpc client passing timeout context

[0xcb9ff9]

Description

PR #323

Two questions

1. When node A is getting blocks from node B, if node B is forced to shut down (or when the network connection is disconnected), GetBlocks will never expire, causing node A to block synchronously. Although difficult to reproduce, the problem does exist.

2. PeerConnInfo.protocolClient saves the grpc client, but the timeout period can't be set in the libp2p stream. libp2p stream leaks if peer disconnects

This PR removes grpc client saving, passing timeout context, enforcing timeouts in libp2p streams

Changes include

• Bugfix (non-breaking change that solves an issue)

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels

Testing

• I have tested this code with the official test suite
• Use test environment dogechain-testenv , random reset TCP connection tested

[codecov-commenter]

Codecov Report

Merging #324 (c09b694) into dev (c23260d) will decrease coverage by 0.05%.
The diff coverage is 66.34%.

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@@            Coverage Diff             @@
##              dev     #324      +/-   ##
==========================================
- Coverage   47.50%   47.46%   -0.05%     
==========================================
  Files         135      135              
  Lines       20444    20468      +24     
==========================================
+ Hits         9712     9715       +3     
- Misses       9898     9923      +25     
+ Partials      834      830       -4     

Impacted Files	Coverage Δ
network/server_nonnetwork.go	0.00% <0.00%> (ø)
network/metrics.go	22.68% <30.55%> (+3.32%)	⬆️
protocol/client.go	50.76% <79.16%> (+2.15%)	⬆️
network/server.go	73.28% <91.30%> (+1.49%)	⬆️
network/discovery/discovery.go	26.95% <100.00%> (+0.42%)	⬆️
network/identity/identity.go	21.60% <100.00%> (ø)
network/server_discovery.go	76.25% <100.00%> (+2.31%)	⬆️
network/server_identity.go	91.75% <100.00%> (+0.35%)	⬆️

... and 2 files with indirect coverage changes

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[DarianShawn]

Great to see this PR.
Only a little suggestion here.
By the way, do we get any manual tests to distinguish the current fix from elder version?

[DarianShawn]

@0xcb9ff9 The working commit is 4d60cdc, right?

[DarianShawn]

LGTM

[0xcb9ff9]

yes, dogechain-testenv is a general test environment