Golang Wrapper.IsNil方法代碼示例

func (rc *RedditChecker) UnpackData(inp *jsonw.Wrapper) (*jsonw.Wrapper, ProofError) {
	var k1, k2 string
	var err error

	inp.AtIndex(0).AtKey("kind").GetStringVoid(&k1, &err)
	parent := inp.AtIndex(0).AtKey("data").AtKey("children").AtIndex(0)
	parent.AtKey("kind").GetStringVoid(&k2, &err)
	var ret *jsonw.Wrapper

	var pe ProofError
	cf := keybase1.ProofStatus_CONTENT_FAILURE
	cm := keybase1.ProofStatus_CONTENT_MISSING

	if err != nil {
		pe = NewProofError(cm, "Bad proof JSON: %s", err)
	} else if k1 != "Listing" {
		pe = NewProofError(cf,
			"Reddit: Wanted a post of type 'Listing', but got %s", k1)
	} else if k2 != "t3" {
		pe = NewProofError(cf, "Wanted a child of type 't3' but got %s", k2)
	} else if ret = parent.AtKey("data"); ret.IsNil() {
		pe = NewProofError(cm, "Couldn't get child data for post")
	}

	return ret, pe

}

func (sh *SigHints) PopulateWith(jw *jsonw.Wrapper) (err error) {

	if jw == nil || jw.IsNil() {
		return
	}

	jw.AtKey("version").GetIntVoid(&sh.version, &err)
	if err != nil {
		return
	}

	sh.hints = make(map[keybase1.SigID]*SigHint)
	var n int
	n, err = jw.AtKey("hints").Len()
	if err != nil {
		return
	}

	for i := 0; i < n; i++ {
		hint, tmpe := NewSigHint(jw.AtKey("hints").AtIndex(i))
		if tmpe != nil {
			sh.G().Log.Warning("Bad SigHint Loaded: %s", tmpe)
		} else {
			sh.hints[hint.sigID] = hint
		}
	}
	return
}

// ParseKeyFamily takes as input a dictionary from a JSON file and returns
// a parsed version for manipulation in the program.
func ParseKeyFamily(jw *jsonw.Wrapper) (ret *KeyFamily, err error) {
	G.Log.Debug("+ ParseKeyFamily")
	defer func() {
		G.Log.Debug("- ParseKeyFamily -> %s", ErrToOk(err))
	}()

	if jw == nil || jw.IsNil() {
		err = KeyFamilyError{"nil record from server"}
		return
	}

	kf := KeyFamily{
		pgp2kid:      make(map[PGPFingerprint]keybase1.KID),
		kid2pgp:      make(map[keybase1.KID]PGPFingerprint),
		Contextified: NewContextified(G),
	}

	// Fill in AllKeys. Somewhat wasteful but probably faster than
	// using Jsonw wrappers, and less error-prone.
	var rkf RawKeyFamily
	if err = jw.UnmarshalAgain(&rkf); err != nil {
		return
	}
	kf.BundlesForTesting = rkf.AllBundles

	// Parse the keys, and collect the PGP keys to map their fingerprints.
	kf.AllKIDs = make(map[keybase1.KID]bool)
	kf.PGPKeySets = make(map[keybase1.KID]*PGPKeySet)
	kf.SingleKeys = make(map[keybase1.KID]GenericKey)
	for _, bundle := range rkf.AllBundles {
		newKey, err := ParseGenericKey(bundle)
		if err != nil {
			return nil, err
		}

		kid := newKey.GetKID()

		if pgp, isPGP := newKey.(*PGPKeyBundle); isPGP {
			ks, ok := kf.PGPKeySets[kid]
			if !ok {
				ks = &PGPKeySet{nil, make(map[string]*PGPKeyBundle)}
				kf.PGPKeySets[kid] = ks

				fp := pgp.GetFingerprint()
				kf.pgp2kid[fp] = kid
				kf.kid2pgp[kid] = fp
			}
			ks.addKey(pgp)
		} else {
			kf.SingleKeys[kid] = newKey
		}
		kf.AllKIDs[kid] = true
	}

	ret = &kf
	return
}

func (c *ChainLink) UnpackComputedKeyInfos(jw *jsonw.Wrapper) (err error) {
	var tmp ComputedKeyInfos
	if jw == nil || jw.IsNil() {
		return
	}
	if err = jw.UnmarshalAgain(&tmp); err == nil {
		c.cki = &tmp
	}
	return
}

func GetLinkID(w *jsonw.Wrapper) (LinkID, error) {
	if w.IsNil() {
		return nil, nil
	}
	s, err := w.GetString()
	if err != nil {
		return nil, err
	}
	ret, err := LinkIDFromHex(s)
	return ret, err
}

func parseTriple(jw *jsonw.Wrapper) (*MerkleTriple, error) {
	if jw.IsNil() {
		return nil, nil
	}

	l, err := jw.Len()
	if err != nil {
		return nil, err
	}
	if l == 0 {
		return nil, nil
	}
	if l == 1 {
		return nil, fmt.Errorf("Bad merkle 'triple', with < 2 values")
	}
	if l > 3 {
		return nil, fmt.Errorf("Bad merkle triple, with > 3 values")
	}
	seqno, err := jw.AtIndex(0).GetInt()
	if err != nil {
		return nil, err
	}
	li, err := GetLinkID(jw.AtIndex(1))
	if err != nil {
		return nil, err
	}

	var si keybase1.SigID
	if l == 3 {
		si, err = GetSigID(jw.AtIndex(2), false)
		if err != nil {
			return nil, err
		}
	}

	return &MerkleTriple{Seqno(seqno), li, si}, nil

}

func importPathFromJSON(jw *jsonw.Wrapper) (out []*PathStep, err error) {
	if jw.IsNil() {
		return
	}

	var path *jsonw.Wrapper
	if path, err = jw.ToArray(); err != nil {
		return
	}

	var l int
	if l, err = path.Len(); err != nil {
		return
	}

	for i := 0; i < l; i++ {
		var step *PathStep
		if step, err = pathStepFromJSON(path.AtIndex(i)); err != nil {
			return
		}
		out = append(out, step)
	}
	return
}

// ParseKeyFamily takes as input a dictionary from a JSON file and returns
// a parsed version for manipulation in the program.
func ParseKeyFamily(g *GlobalContext, jw *jsonw.Wrapper) (ret *KeyFamily, err error) {
	defer g.Trace("ParseKeyFamily", func() error { return err })()

	if jw == nil || jw.IsNil() {
		err = KeyFamilyError{"nil record from server"}
		return
	}

	kf := KeyFamily{
		Contextified: NewContextified(g),
		pgp2kid:      make(map[PGPFingerprint]keybase1.KID),
		kid2pgp:      make(map[keybase1.KID]PGPFingerprint),
	}

	// Fill in AllKeys. Somewhat wasteful but probably faster than
	// using Jsonw wrappers, and less error-prone.
	var rkf RawKeyFamily
	if err = jw.UnmarshalAgain(&rkf); err != nil {
		return
	}
	kf.BundlesForTesting = rkf.AllBundles

	// Parse the keys, and collect the PGP keys to map their fingerprints.
	kf.AllKIDs = make(map[keybase1.KID]bool)
	kf.PGPKeySets = make(map[keybase1.KID]*PGPKeySet)
	kf.SingleKeys = make(map[keybase1.KID]GenericKey)
	for i, bundle := range rkf.AllBundles {
		newKey, err := ParseGenericKey(bundle)

		// Some users have some historical bad keys, so no reason to crap
		// out if we can't parse them, especially if there are others than
		// can do just as well.
		if err != nil {
			g.Log.Notice("Failed to parse public key at position %d", i)
			g.Log.Debug("Key parsing error: %s", err)
			g.Log.Debug("Full key dump follows")
			g.Log.Debug(bundle)
			continue
		}

		kid := newKey.GetKID()

		if pgp, isPGP := newKey.(*PGPKeyBundle); isPGP {
			ks, ok := kf.PGPKeySets[kid]
			if !ok {
				ks = &PGPKeySet{NewContextified(g), nil, make(map[string]*PGPKeyBundle)}
				kf.PGPKeySets[kid] = ks

				fp := pgp.GetFingerprint()
				kf.pgp2kid[fp] = kid
				kf.kid2pgp[kid] = fp
			}
			ks.addKey(pgp)
		} else {
			kf.SingleKeys[kid] = newKey
		}
		kf.AllKIDs[kid] = true
	}

	ret = &kf
	return
}