Rpc and related func added and fix

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #607 into master will increase coverage by 1.29%.
The diff coverage is 57.32%.

@@            Coverage Diff             @@
##           master     #607      +/-   ##
==========================================
+ Coverage   45.01%   46.30%   +1.29%     
==========================================
  Files         382      403      +21     
  Lines       47554    50863    +3309     
==========================================
+ Hits        21408    23554    +2146     
- Misses      24564    25538     +974     
- Partials     1582     1771     +189     

Impacted Files	Coverage Δ
cmd/cortex/main.go	18.69% <0.00%> (ø)
cmd/devp2p/main.go	22.85% <0.00%> (ø)
ctxc/sync.go	59.60% <ø> (ø)
metrics/metrics.go	7.93% <ø> (+0.12%)	⬆️
p2p/simulations/adapters/inproc.go	0.00% <0.00%> (ø)
p2p/simulations/adapters/types.go	0.00% <0.00%> (ø)
rpc/endpoints.go	0.00% <ø> (ø)
rpc/stdio.go	0.00% <0.00%> (ø)
trie/sync_bloom.go	60.52% <ø> (-5.27%)	⬇️
p2p/simulations/adapters/exec.go	0.73% <0.73%> (ø)
... and 56 more

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[ucwong]

All test has been password include mining chart and exchange