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40 lines
1.4 KiB
40 lines
1.4 KiB
6 years ago
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## Node Architecture (WIP)
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### Services
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In Harmony network, a node can be treated as one of the roles: validator, leader, beacon validator, beacon leader depending on its context. With each role, a node can run a certian set of services.
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For example, a leader needs to run explorer support service, client support service, syncing support service etc.. while a normal validator does not run such many.
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### Service Manager
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To support such behavior, we architecture Node logic with service manager which can wait for actions which each triggers its management operation such as starting some service, stopping some service.
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Each service needs to implement minimal interace behavior like Start, Stop so that the service manager can handle those operation.
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```
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// ServiceInterface is the collection of functions any service needs to implement.
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type ServiceInterface interface {
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Start()
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Stop()
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}
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```
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### Action
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Action is the input to operate Service Manager. We can send action to action channel of service manager to start or stop a service.
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```
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// Action is type of service action.
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type Action struct {
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action ActionType
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serviceType Type
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params map[string]interface{}
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}
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```
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### Resharding
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Service Manager is very handy to transform a node role from validator to leader or anything else. All we need to do is to stop all current services and start all services of the new role.
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