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prepared_query.go
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prepared_query.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package api
// QueryFailoverOptions sets options about how we fail over if there are no
// healthy nodes in the local datacenter.
type QueryFailoverOptions struct {
// NearestN is set to the number of remote datacenters to try, based on
// network coordinates.
NearestN int
// Datacenters is a fixed list of datacenters to try after NearestN. We
// never try a datacenter multiple times, so those are subtracted from
// this list before proceeding.
Datacenters []string
// Targets is a fixed list of datacenters and peers to try. This field cannot
// be populated with NearestN or Datacenters.
Targets []QueryFailoverTarget
}
// Deprecated: use QueryFailoverOptions instead.
type QueryDatacenterOptions = QueryFailoverOptions
type QueryFailoverTarget struct {
// Peer specifies a peer to try during failover.
Peer string
// Datacenter specifies a datacenter to try during failover.
Datacenter string
// Partition specifies a partition to try during failover
// Note: Partition are available only in Consul Enterprise
Partition string `json:",omitempty"`
// Namespace specifies a namespace to try during failover
// Note: Namespaces are available only in Consul Enterprise
Namespace string `json:",omitempty"`
}
// QueryDNSOptions controls settings when query results are served over DNS.
type QueryDNSOptions struct {
// TTL is the time to live for the served DNS results.
TTL string
}
// ServiceQuery is used to query for a set of healthy nodes offering a specific
// service.
type ServiceQuery struct {
// Service is the service to query.
Service string
// SamenessGroup specifies a sameness group to query. The first member of the Sameness Group will
// be targeted first on PQ execution and subsequent members will be targeted during failover scenarios.
// This field is mutually exclusive with Failover.
SamenessGroup string `json:",omitempty"`
// Namespace of the service to query
Namespace string `json:",omitempty"`
// Partition of the service to query
Partition string `json:",omitempty"`
// Near allows baking in the name of a node to automatically distance-
// sort from. The magic "_agent" value is supported, which sorts near
// the agent which initiated the request by default.
Near string
// Failover controls what we do if there are no healthy nodes in the
// local datacenter.
Failover QueryFailoverOptions `json:",omitempty"`
// IgnoreCheckIDs is an optional list of health check IDs to ignore when
// considering which nodes are healthy. It is useful as an emergency measure
// to temporarily override some health check that is producing false negatives
// for example.
IgnoreCheckIDs []string
// If OnlyPassing is true then we will only include nodes with passing
// health checks (critical AND warning checks will cause a node to be
// discarded)
OnlyPassing bool
// Tags are a set of required and/or disallowed tags. If a tag is in
// this list it must be present. If the tag is preceded with "!" then
// it is disallowed.
Tags []string
// NodeMeta is a map of required node metadata fields. If a key/value
// pair is in this map it must be present on the node in order for the
// service entry to be returned.
NodeMeta map[string]string
// ServiceMeta is a map of required service metadata fields. If a key/value
// pair is in this map it must be present on the node in order for the
// service entry to be returned.
ServiceMeta map[string]string
// Connect if true will filter the prepared query results to only
// include Connect-capable services. These include both native services
// and proxies for matching services. Note that if a proxy matches,
// the constraints in the query above (Near, OnlyPassing, etc.) apply
// to the _proxy_ and not the service being proxied. In practice, proxies
// should be directly next to their services so this isn't an issue.
Connect bool
}
// QueryTemplate carries the arguments for creating a templated query.
type QueryTemplate struct {
// Type specifies the type of the query template. Currently only
// "name_prefix_match" is supported. This field is required.
Type string
// Regexp allows specifying a regex pattern to match against the name
// of the query being executed.
Regexp string
// RemoveEmptyTags if set to true, will cause the Tags list inside
// the Service structure to be stripped of any empty strings. This is useful
// when interpolating into tags in a way where the tag is optional, and
// where searching for an empty tag would yield no results from the query.
RemoveEmptyTags bool
}
// PreparedQueryDefinition defines a complete prepared query.
type PreparedQueryDefinition struct {
// ID is this UUID-based ID for the query, always generated by Consul.
ID string
// Name is an optional friendly name for the query supplied by the
// user. NOTE - if this feature is used then it will reduce the security
// of any read ACL associated with this query/service since this name
// can be used to locate nodes with supplying any ACL.
Name string
// Session is an optional session to tie this query's lifetime to. If
// this is omitted then the query will not expire.
Session string
// Token is the ACL token used when the query was created, and it is
// used when a query is subsequently executed. This token, or a token
// with management privileges, must be used to change the query later.
Token string
// Service defines a service query (leaving things open for other types
// later).
Service ServiceQuery
// DNS has options that control how the results of this query are
// served over DNS.
DNS QueryDNSOptions
// Template is used to pass through the arguments for creating a
// prepared query with an attached template. If a template is given,
// interpolations are possible in other struct fields.
Template QueryTemplate
}
// PreparedQueryExecuteResponse has the results of executing a query.
type PreparedQueryExecuteResponse struct {
// Service is the service that was queried.
Service string
// Namespace of the service that was queried
Namespace string `json:",omitempty"`
// Nodes has the nodes that were output by the query.
Nodes []ServiceEntry
// DNS has the options for serving these results over DNS.
DNS QueryDNSOptions
// Datacenter is the datacenter that these results came from.
Datacenter string
// Failovers is a count of how many times we had to query a remote
// datacenter.
Failovers int
}
// PreparedQuery can be used to query the prepared query endpoints.
type PreparedQuery struct {
c *Client
}
// PreparedQuery returns a handle to the prepared query endpoints.
func (c *Client) PreparedQuery() *PreparedQuery {
return &PreparedQuery{c}
}
// Create makes a new prepared query. The ID of the new query is returned.
func (c *PreparedQuery) Create(query *PreparedQueryDefinition, q *WriteOptions) (string, *WriteMeta, error) {
r := c.c.newRequest("POST", "/v1/query")
r.setWriteOptions(q)
r.obj = query
rtt, resp, err := c.c.doRequest(r)
if err != nil {
return "", nil, err
}
defer closeResponseBody(resp)
if err := requireOK(resp); err != nil {
return "", nil, err
}
wm := &WriteMeta{}
wm.RequestTime = rtt
var out struct{ ID string }
if err := decodeBody(resp, &out); err != nil {
return "", nil, err
}
return out.ID, wm, nil
}
// Update makes updates to an existing prepared query.
func (c *PreparedQuery) Update(query *PreparedQueryDefinition, q *WriteOptions) (*WriteMeta, error) {
return c.c.write("/v1/query/"+query.ID, query, nil, q)
}
// List is used to fetch all the prepared queries (always requires a management
// token).
func (c *PreparedQuery) List(q *QueryOptions) ([]*PreparedQueryDefinition, *QueryMeta, error) {
var out []*PreparedQueryDefinition
qm, err := c.c.query("/v1/query", &out, q)
if err != nil {
return nil, nil, err
}
return out, qm, nil
}
// Get is used to fetch a specific prepared query.
func (c *PreparedQuery) Get(queryID string, q *QueryOptions) ([]*PreparedQueryDefinition, *QueryMeta, error) {
var out []*PreparedQueryDefinition
qm, err := c.c.query("/v1/query/"+queryID, &out, q)
if err != nil {
return nil, nil, err
}
return out, qm, nil
}
// Delete is used to delete a specific prepared query.
func (c *PreparedQuery) Delete(queryID string, q *WriteOptions) (*WriteMeta, error) {
r := c.c.newRequest("DELETE", "/v1/query/"+queryID)
r.setWriteOptions(q)
rtt, resp, err := c.c.doRequest(r)
if err != nil {
return nil, err
}
defer closeResponseBody(resp)
if err := requireOK(resp); err != nil {
return nil, err
}
wm := &WriteMeta{}
wm.RequestTime = rtt
return wm, nil
}
// Execute is used to execute a specific prepared query. You can execute using
// a query ID or name.
func (c *PreparedQuery) Execute(queryIDOrName string, q *QueryOptions) (*PreparedQueryExecuteResponse, *QueryMeta, error) {
var out *PreparedQueryExecuteResponse
qm, err := c.c.query("/v1/query/"+queryIDOrName+"/execute", &out, q)
if err != nil {
return nil, nil, err
}
return out, qm, nil
}