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API to find a key in a etcd cluster

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0

I am trying to write a code where I need to find if a key exists in etcd or not. I tried this:

_, err = kapi.Get(context.Background(), key, nil)
 if err != nil 
 return err 
 else { ...

But even if the key is not in the cluster, the error is always nil.

Any idea what am I doing wrong here? Or is there any other API call to make?

go etcd

share|improve this question

edited Mar 26 at 14:56

François P.

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asked Mar 26 at 5:39

PensuPensu

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add a comment | 

0

I am trying to write a code where I need to find if a key exists in etcd or not. I tried this:

_, err = kapi.Get(context.Background(), key, nil)
 if err != nil 
 return err 
 else { ...

But even if the key is not in the cluster, the error is always nil.

Any idea what am I doing wrong here? Or is there any other API call to make?

go etcd

share|improve this question

edited Mar 26 at 14:56

François P.

2,14577 silver badges1616 bronze badges

asked Mar 26 at 5:39

PensuPensu

89777 gold badges2121 silver badges5151 bronze badges

add a comment | 

I am trying to write a code where I need to find if a key exists in etcd or not. I tried this:

_, err = kapi.Get(context.Background(), key, nil)
 if err != nil 
 return err 
 else { ...

But even if the key is not in the cluster, the error is always nil.

Any idea what am I doing wrong here? Or is there any other API call to make?

go etcd

share|improve this question

edited Mar 26 at 14:56

François P.

2,14577 silver badges1616 bronze badges

asked Mar 26 at 5:39

PensuPensu

89777 gold badges2121 silver badges5151 bronze badges

_, err = kapi.Get(context.Background(), key, nil)
 if err != nil 
 return err 
 else { ...

go etcd

go etcd

share|improve this question

edited Mar 26 at 14:56

François P.

2,14577 silver badges1616 bronze badges

asked Mar 26 at 5:39

PensuPensu

89777 gold badges2121 silver badges5151 bronze badges

share|improve this question

edited Mar 26 at 14:56

François P.

2,14577 silver badges1616 bronze badges

asked Mar 26 at 5:39

PensuPensu

89777 gold badges2121 silver badges5151 bronze badges

edited Mar 26 at 14:56

François P.

2,14577 silver badges1616 bronze badges

edited Mar 26 at 14:56

François P.

2,14577 silver badges1616 bronze badges

asked Mar 26 at 5:39

PensuPensu

89777 gold badges2121 silver badges5151 bronze badges

asked Mar 26 at 5:39

PensuPensu

89777 gold badges2121 silver badges5151 bronze badges

1 Answer
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1

If you use the go client v3 KV client here: https://godoc.org/go.etcd.io/etcd/clientv3#KV

It returns the following type:
https://godoc.org/go.etcd.io/etcd/etcdserver/etcdserverpb#RangeResponse

type RangeResponse struct 
 Header *ResponseHeader `protobuf:"bytes,1,opt,name=header" json:"header,omitempty"`
 // kvs is the list of key-value pairs matched by the range request.
 // kvs is empty when count is requested.
 Kvs []*mvccpb.KeyValue `protobuf:"bytes,2,rep,name=kvs" json:"kvs,omitempty"`
 // more indicates if there are more keys to return in the requested range.
 More bool `protobuf:"varint,3,opt,name=more,proto3" json:"more,omitempty"`
 // count is set to the number of keys within the range when requested.
 Count int64 `protobuf:"varint,4,opt,name=count,proto3" json:"count,omitempty"`

So as you see, there is a Count property and a Kvs property, if you want to check that your response contains keys you can just check that Count > 0 or len(res.Kvs) > 0

share|improve this answer

answered Mar 26 at 14:56

François P.François P.

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add a comment | 

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1

If you use the go client v3 KV client here: https://godoc.org/go.etcd.io/etcd/clientv3#KV

It returns the following type:
https://godoc.org/go.etcd.io/etcd/etcdserver/etcdserverpb#RangeResponse

type RangeResponse struct 
 Header *ResponseHeader `protobuf:"bytes,1,opt,name=header" json:"header,omitempty"`
 // kvs is the list of key-value pairs matched by the range request.
 // kvs is empty when count is requested.
 Kvs []*mvccpb.KeyValue `protobuf:"bytes,2,rep,name=kvs" json:"kvs,omitempty"`
 // more indicates if there are more keys to return in the requested range.
 More bool `protobuf:"varint,3,opt,name=more,proto3" json:"more,omitempty"`
 // count is set to the number of keys within the range when requested.
 Count int64 `protobuf:"varint,4,opt,name=count,proto3" json:"count,omitempty"`

So as you see, there is a Count property and a Kvs property, if you want to check that your response contains keys you can just check that Count > 0 or len(res.Kvs) > 0

share|improve this answer

answered Mar 26 at 14:56

François P.François P.

2,14577 silver badges1616 bronze badges

add a comment | 

1

If you use the go client v3 KV client here: https://godoc.org/go.etcd.io/etcd/clientv3#KV

It returns the following type:
https://godoc.org/go.etcd.io/etcd/etcdserver/etcdserverpb#RangeResponse

type RangeResponse struct 
 Header *ResponseHeader `protobuf:"bytes,1,opt,name=header" json:"header,omitempty"`
 // kvs is the list of key-value pairs matched by the range request.
 // kvs is empty when count is requested.
 Kvs []*mvccpb.KeyValue `protobuf:"bytes,2,rep,name=kvs" json:"kvs,omitempty"`
 // more indicates if there are more keys to return in the requested range.
 More bool `protobuf:"varint,3,opt,name=more,proto3" json:"more,omitempty"`
 // count is set to the number of keys within the range when requested.
 Count int64 `protobuf:"varint,4,opt,name=count,proto3" json:"count,omitempty"`

So as you see, there is a Count property and a Kvs property, if you want to check that your response contains keys you can just check that Count > 0 or len(res.Kvs) > 0

share|improve this answer

answered Mar 26 at 14:56

François P.François P.

2,14577 silver badges1616 bronze badges

add a comment | 

If you use the go client v3 KV client here: https://godoc.org/go.etcd.io/etcd/clientv3#KV

It returns the following type:
https://godoc.org/go.etcd.io/etcd/etcdserver/etcdserverpb#RangeResponse

type RangeResponse struct 
 Header *ResponseHeader `protobuf:"bytes,1,opt,name=header" json:"header,omitempty"`
 // kvs is the list of key-value pairs matched by the range request.
 // kvs is empty when count is requested.
 Kvs []*mvccpb.KeyValue `protobuf:"bytes,2,rep,name=kvs" json:"kvs,omitempty"`
 // more indicates if there are more keys to return in the requested range.
 More bool `protobuf:"varint,3,opt,name=more,proto3" json:"more,omitempty"`
 // count is set to the number of keys within the range when requested.
 Count int64 `protobuf:"varint,4,opt,name=count,proto3" json:"count,omitempty"`

So as you see, there is a Count property and a Kvs property, if you want to check that your response contains keys you can just check that Count > 0 or len(res.Kvs) > 0

share|improve this answer

answered Mar 26 at 14:56

François P.François P.

2,14577 silver badges1616 bronze badges

type RangeResponse struct 
 Header *ResponseHeader `protobuf:"bytes,1,opt,name=header" json:"header,omitempty"`
 // kvs is the list of key-value pairs matched by the range request.
 // kvs is empty when count is requested.
 Kvs []*mvccpb.KeyValue `protobuf:"bytes,2,rep,name=kvs" json:"kvs,omitempty"`
 // more indicates if there are more keys to return in the requested range.
 More bool `protobuf:"varint,3,opt,name=more,proto3" json:"more,omitempty"`
 // count is set to the number of keys within the range when requested.
 Count int64 `protobuf:"varint,4,opt,name=count,proto3" json:"count,omitempty"`

share|improve this answer

answered Mar 26 at 14:56

François P.François P.

2,14577 silver badges1616 bronze badges

answered Mar 26 at 14:56

François P.François P.

2,14577 silver badges1616 bronze badges

answered Mar 26 at 14:56

François P.François P.

2,14577 silver badges1616 bronze badges