indexer/config.go


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package indexer

import (
    "plugin"

    "github.com/dexon-foundation/dexon/core"
    "github.com/dexon-foundation/dexon/dex/downloader"
)

// Config is data sources related configs struct.
type Config struct {
    // Used by dex/backend init flow.
    Enable bool

    // Plugin path for building components.
    Plugin string

    // PluginFlags for construction if needed.
    PluginFlags string

    // The genesis block from dex.Config
    Genesis *core.Genesis

    // Protocol options from dex.Config (partial)
    NetworkID uint64
    SyncMode  downloader.SyncMode
}

// NewIndexerFromConfig initialize exporter according to given config.
func NewIndexerFromConfig(bc ReadOnlyBlockChain, c Config) (idx Indexer) {
    if c.Plugin == "" {
        // default
        return
    }

    plug, err := plugin.Open(c.Plugin)
    if err != nil {
        panic(err)
    }

    symbol, err := plug.Lookup(NewIndexerFuncName)
    if err != nil {
        panic(err)
    }

    idx = symbol.(NewIndexerFunc)(bc, c)
    return
}