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alpha: add public extensibility hooks for the gRPC server and CLI flags - #9742
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Introduce dgraph/cmd/alpha/hooks.go declaring package-level function vars with upstream-safe no-op defaults: RegisterFlags(*pflag.FlagSet), RegisterZanzibar(*grpc.Server), and ZanzibarUnary/StreamInterceptor() returning nil. In a stock build the defaults run, so behavior is unchanged. Refactor serveGRPC to build its interceptors as slices and install them via grpc.ChainUnaryInterceptor / grpc.ChainStreamInterceptor instead of a single grpc.UnaryInterceptor. The audit interceptor stays first; the chain lets additional unary/stream interceptors compose. Wire RegisterFlags(flag) into Alpha's flag setup and RegisterZanzibar(s) into the server registration. These are extension points: a build can register an extra gRPC service, CLI flags, and auth interceptors by reassigning the vars from its own init(), with no further changes to run.go. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
Introduces
dgraph/cmd/alpha/hooks.go, declaring package-level function vars with upstream-safe no-op defaults:RegisterFlags(*pflag.FlagSet)— register extra CLI flagsRegisterZanzibar(*grpc.Server)— register an extra gRPC serviceZanzibarUnaryInterceptor() grpc.UnaryServerInterceptor/ZanzibarStreamInterceptor() grpc.StreamServerInterceptor— optional auth interceptors (returningnil= not installed)In a stock build the defaults run, so behavior is unchanged.
It also refactors
serveGRPCto build its interceptors as slices and install them viagrpc.ChainUnaryInterceptor/grpc.ChainStreamInterceptorinstead of a singlegrpc.UnaryInterceptor, so multiple interceptors can compose. The audit interceptor stays first.Why
Lets a build register an extra gRPC service, CLI flags, and auth interceptors by reassigning the vars from its own
init(), with no further changes torun.go— the same extension-hook pattern already used elsewhere in the tree.