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jwt: Cache the bcrypt password hash. (#3526)

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Creds don't require secretKeyHash to be calculated
everytime, cache it instead and re-use.

This is an optimization for bcrypt.

Relevant results from the benchmark done locally, negative
value means improvement in this scenario.

```
benchmark                       old ns/op     new ns/op     delta
BenchmarkAuthenticateNode-4     160590992     80125647      -50.11%
BenchmarkAuthenticateWeb-4      160556692     80432144      -49.90%

benchmark                       old allocs     new allocs     delta
BenchmarkAuthenticateNode-4     87             75             -13.79%
BenchmarkAuthenticateWeb-4      87             75             -13.79%

benchmark                       old bytes     new bytes     delta
BenchmarkAuthenticateNode-4     15222         9785          -35.72%
BenchmarkAuthenticateWeb-4      15222         9785          -35.72%
```
This commit is contained in:
Harshavardhana
2017-01-26 16:51:51 -08:00
committed by GitHub
parent 152cdf1c05
commit 85f2b74cfd
13 changed files with 101 additions and 56 deletions
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cmd/globals.go
+2 -5
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@@ -110,11 +110,8 @@ var (
// Minio server user agent string.
globalServerUserAgent = "Minio/" + ReleaseTag + " (" + runtime.GOOS + "; " + runtime.GOARCH + ")"
// Global server's access key
globalEnvAccessKey = ""
// Global server's secret key
globalEnvSecretKey = ""
// Set to true if credentials were passed from env, default is false.
globalIsEnvCreds = false
// url.URL endpoints of disks that belong to the object storage.
globalEndpoints = []*url.URL{}