Signed-off-by: Lily Sturmann <lsturman@redhat.com>

tlog_id specifes the active shard and is kept for backwards compatibility.
To avoid replicating information, the shard config file is used only to
specify inactive shards and must be used in conjunction with a tlog_id flag.
Together, these build the logRanges type in the sharding module.

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Replace trillian_log_server.log_id_ranges flag with a config file

This will make it easier to specify mulitple shards, along with associated tree IDs and lengths.
Each shard may eventually have its own signer/public key as well, so it'll be easier to pass those in through
a config file rather than through CLI flags.

Signed-off-by: Priya Wadhwa <priya@chainguard.dev>

* Add active tree ID to ranges

Signed-off-by: Priya Wadhwa <priya@chainguard.dev>

* Return virtual index when creating and getting a log entry

Use the virtual index when signing an entry on creation, and return that to the end user.
There shouldn't be any observable difference here at the moment, until we actually shard the log.

Signed-off-by: Priya Wadhwa <priya@chainguard.dev>

* Remove pointer to logRanges so value can't be modified

Also make all fields private and only accessible via funcition calls

Signed-off-by: Priya Wadhwa <priya@chainguard.dev>

* Fix virtual log index bug when getting indicies in inactive shards

Signed-off-by: Priya Wadhwa <priya@chainguard.dev>

* Add helpers and refactor sharding package

- Adds a function to get a TreeID from an ID string
- Adds testing for the above
- Consolidates validation logic for UUID, TreeID, EntryID
- Removes code that attempts to use ActiveIndex() in the sharding
  package, as this is not accessible due to import cycles
- Other small cleanup and typo fixes

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Change logRanges to work with int64

This is the type used by the trillian TreeID and saves from having to
convert in multiple places.

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Add TreeID to LogInfo API endpoint

WARNING: breaks loginfo cmd to current prod server

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Update API based on logRangesFlag

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Use API's logRanges to retrieve artifacts

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Move range.go into sharding package to avoid import cycles

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Change name of FullID to EntryID

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Add unit tests for sharding package

Also add a few helper functions and update names.

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Add logic to GET artifacts via old UUID or new EntryID

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Add e2e test for longer EntryID

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Add sharding package

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Update validators to support future FullID

A FullID is a UUID prepended by a TreeID. This will be used for log sharding

Signed-off-by: Lily Sturmann <lsturman@redhat.com>