Checkers

type CheckFunc func(ctx CheckerContext) *ErrContext

var Checkers map[string]CheckFunc

The Checkers map is the registry of validation functions, keyed by rule name. Built-in entries:

var Checkers = map[string]CheckFunc{
    "required":     required,
    "min":          min,
    "max":          max,
    "minlen":       minlen,
    "maxlen":       maxlen,
    "alpha":        alpha,
    "alphanumeric": alphaNumeric,
    "alphadash":    alphaDash,
    "username":     userName,
    "email":        email,
    "ipv4":         ipv4,
    "mobile":       mobile,
    "tel":          tel,
    "phone":        phone,
    "idcard":       idCard,
    "equal":        equal,
    "list":         list,
}

For per-rule semantics, see Built-in Checkers.

Adding a checker

govalid.Checkers["myRule"] = func(c govalid.CheckerContext) *govalid.ErrContext {
    // ...
    return nil
}

Replacing a checker

Same syntax — assigning to an existing key overrides the built-in:

govalid.Checkers["required"] = func(c govalid.CheckerContext) *govalid.ErrContext {
    // override built-in semantics
    return nil
}

Removing a checker

delete(govalid.Checkers, "idcard")

References to the deleted rule in struct tags will trigger MakeCheckerNotFoundError at runtime.

Concurrency

The map itself is not synchronized for writes. Mutate it once at program startup, then leave it alone while requests are flying. Reads from multiple goroutines are safe under the standard Go map contract (no concurrent writer).