VTN-9100

[dduyVeritone]

Overview

• Add retry policy capability for the client
• Add unit test to ensure retrying works

Test

• Unit test passed
• Local test
  • Start coordinator first with retry config implemented:

    retryConfig := graphql.RetryConfig{
    MaxTries:    100,
    Interval:    3,
    Policy:      graphql.Linear,
    MaxInterval: 100,
    }
    cl := graphql.NewClient(endpoint, withAuthHeader(token, timeoutDur), graphql.WithRetryConfig(retryConfig))

  • Let it run for awhile, we'd get logs look like:

    2018/07/20 14:16:26 Will retry after interval expires
    2018/07/20 14:16:26 Waiting for interval(3.000000) to expire...
    2018/07/20 14:16:29 New interval: 3.000000
    2018/07/20 14:16:29 Will retry after interval expires
    2018/07/20 14:16:29 Waiting for interval(3.000000) to expire...
    2018/07/20 14:16:32 New interval: 3.000000
    2018/07/20 14:16:32 Will retry after interval expires
    2018/07/20 14:16:32 Waiting for interval(3.000000) to expire...
    2018/07/20 14:16:35 New interval: 3.000000
    2018/07/20 14:16:35 Will retry after interval expires
    2018/07/20 14:16:35 Waiting for interval(3.000000) to expire...

  • Start up core-graphql-server, we'd get the follow:

    {"level":"info","message":"\u003c\u003c {\"data\":{\"me\":{\"id\":\"d6323f58-1053-4a06-af92-81220647f691\"}}}","timestamp":"2018-07-20T14:16:54-07:00"}
    {"level":"info","message":"Initialized GraphQL client successfully using endpoint: http://localhost:3000/graphql","timestamp":"2018-07-20T14:16:54-07:00"}