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kong.service
The service module contains a set of functions to manipulate the connection aspect of the request to the Service, such as connecting to a given host, IP address/port, or choosing a given Upstream entity for load-balancing and health checking.
kong.service.set_upstream(host)
Sets the desired Upstream entity to handle the load-balancing step for
this request. Using this method is equivalent to creating a Service with a
host
property equal to that of an Upstream entity (in which case, the
request would be proxied to one of the Targets associated with that
Upstream).
The host
argument should receive a string equal to that of one of the
Upstream entities currently configured.
Phases
- access
Parameters
-
host (
string
):
Returns
-
boolean|nil
:true
on success, ornil
if no upstream entities where found -
string|nil
: An error message describing the error if there was one.
Usage
local ok, err = kong.service.set_upstream("service.prod")
if not ok then
kong.log.err(err)
return
end
kong.service.set_target(host, port)
Sets the host and port on which to connect to for proxying the request. Using this method is equivalent to ask Kong to not run the load-balancing phase for this request, and consider it manually overridden. Load-balancing components such as retries and health-checks will also be ignored for this request.
The host
argument expects a string containing the IP address of the
upstream server (IPv4/IPv6), and the port
argument must contain a number
representing the port on which to connect to.
Phases
- access
Parameters
-
host (
string
): -
port (
number
):
Usage
kong.service.set_target("service.local", 443)
kong.service.set_target("192.168.130.1", 80)
kong.service.set_tls_cert_key(chain, key)
Sets the client certificate used while handshaking with the Service.
The chain
argument is the client certificate and intermediate chain (if any)
returned by functions such as ngx.ssl.parse_pem_cert.
The key
argument is the private key corresponding to the client certificate
returned by functions such as ngx.ssl.parse_pem_priv_key.
Phases
-
rewrite
,access
,balancer
Parameters
-
chain (
cdata
): The client certificate chain -
key (
cdata
): The client certificate private key
Returns
-
boolean|nil
:true
if the operation succeeded,nil
if an error occurred -
string|nil
: An error message describing the error if there was one
Usage
local chain = assert(ssl.parse_pem_cert(cert_data))
local key = assert(ssl.parse_pem_priv_key(key_data))
local ok, err = kong.service.set_tls_cert_key(chain, key)
if not ok then
-- do something with error
end
kong.service.set_tls_verify(on)
Sets whether TLS verification is enabled while handshaking with the Service.
The on
argument is a boolean flag, where true
means upstream verification
is enabled and false
disables it.
This call affects only the current request. If the trusted certificate store is not set already (via proxy_ssl_trusted_certificate or kong.service.set_upstream_ssl_trusted_store), then TLS verification will always fail with “unable to get local issuer certificate” error.
Phases
-
rewrite
,access
,balancer
Parameters
-
on (
boolean
): Whether to enable TLS certificate verification for the current request
Returns
-
boolean|nil
:true
if the operation succeeded,nil
if an error occurred -
string|nil
: An error message describing the error if there was one
Usage
local ok, err = kong.service.set_tls_verify(true)
if not ok then
-- do something with error
end
kong.service.set_tls_verify_depth(depth)
Sets the maximum depth of verification when validating upstream server’s TLS certificate.
This call affects only the current request. For the depth to be actually used the verification has to be enabled with either the proxy_ssl_verify directive or using the kong.service.set_tls_verify function.
Phases
-
rewrite
,access
,balancer
Parameters
-
depth (
number
): Depth to use when validating. Must be non-negative
Returns
-
boolean|nil
:true
if the operation succeeded,nil
if an error occurred -
string|nil
: An error message describing the error if there was one
Usage
local ok, err = kong.service.set_tls_verify_depth(3)
if not ok then
-- do something with error
end
kong.service.set_tls_verify_store(store)
Sets the CA trust store to use when validating upstream server’s TLS certificate.
This call affects only the current request. For the store to be actually used the verification has to be enabled with either the proxy_ssl_verify directive or using the kong.service.set_tls_verify function.
The resty.openssl.x509.store object can be created by following examples from the Kong/lua-kong-nginx-module repo.
Phases
-
rewrite
,access
,balancer
Parameters
-
store (
table
): resty.openssl.x509.store object to use
Returns
-
boolean|nil
:true
if the operation succeeded,nil
if an error occurred -
string|nil
: An error message describing the error if there was one
Usage
local store = require("resty.openssl.x509.store")
local st = assert(store.new())
-- st:add(...certificate)
local ok, err = kong.service.set_tls_verify_store(st)
if not ok then
-- do something with error
end