refactor(db): return error and use pipeline in Redis GetMulti

[MaineK00n]

What did you implement:

Changed to return error for functions related to Get. Also, GetMulti in Redis uses a pipeline to search efficiently.

Type of change

• [x] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

$ patch -p1 < test.patch
$ make clean-integration && make build-integration
$ make fetch-rdb && make fetch-redis
$ make diff-server-rdb && make diff-server-redis && maek diff-server-rdb-redis

• test.patch

  
  diff --git a/GNUmakefile b/GNUmakefile
  index 8d5003e..a59b406 100644
  --- a/GNUmakefile
  +++ b/GNUmakefile
  @@ -73,7 +73,7 @@ BRANCH := $(shell git symbolic-ref --short HEAD)
  build-integration:
  @ git stash save
  go build -ldflags "$(LDFLAGS)" -o integration/exploitdb.new

• git checkout $(shell git describe --tags --abbrev=0)

• git checkout upstream/master @git reset --hard go build -ldflags "$(LDFLAGS)" -o integration/exploitdb.old git checkout $(BRANCH) @@ -109,26 +109,26 @@ fetch-redis: integration/exploitdb.new fetch githubrepos --dbtype redis --dbpath "redis://127.0.0.1:6380/0"

  diff-cveid:

• @ python integration/diff_server_mode.py cveid --sample_rate 0.01
• @ python integration/diff_server_mode.py cveids --sample_rate 0.01
• @ python integration/diff_server_mode.py cveid --sample_rate 1.00

• @ python integration/diff_server_mode.py cveids --sample_rate 1.00

  diff-uniqueid:

• @ python integration/diff_server_mode.py uniqueid --sample_rate 0.01
• @ python integration/diff_server_mode.py uniqueids --sample_rate 0.01
• @ python integration/diff_server_mode.py uniqueid --sample_rate 1.00

• @ python integration/diff_server_mode.py uniqueids --sample_rate 1.00

  diff-server-rdb: integration/exploitdb.old server --dbpath=$(PWD)/integration/go-exploitdb.old.sqlite3 --port 1325 > /dev/null 2>&1 & integration/exploitdb.new server --dbpath=$(PWD)/integration/go-exploitdb.new.sqlite3 --port 1326 > /dev/null 2>&1 &

• make diff-cveid
• make diff-uniqueid
• @ python integration/diff_server_mode.py cveid --sample_rate 1.00

• @ python integration/diff_server_mode.py uniqueid --sample_rate 1.00 pkill exploitdb.old pkill exploitdb.new

  diff-server-redis: integration/exploitdb.old server --dbtype redis --dbpath "redis://127.0.0.1:6379/0" --port 1325 > /dev/null 2>&1 & integration/exploitdb.new server --dbtype redis --dbpath "redis://127.0.0.1:6380/0" --port 1326 > /dev/null 2>&1 &

• make diff-cveid
• make diff-uniqueid
• @ python integration/diff_server_mode.py cveid --sample_rate 1.00
• @ python integration/diff_server_mode.py uniqueid --sample_rate 1.00 pkill exploitdb.old pkill exploitdb.new

# Checklist:
You don't have to satisfy all of the following.

- [ ] Write tests
- [ ] Write documentation
- [x] Check that there aren't other open pull requests for the same issue/feature
- [x] Format your source code by `make fmt`
- [x] Pass the test by `make test`
- [x] Provide verification config / commands
- [x] Enable "Allow edits from maintainers" for this PR
- [x] Update the messages below

***Is this ready for review?:*** YES

# Reference