EnvoyFilterUsesRelativeOperation
当 EnvoyFilter
没有优先级且使用相对补丁操作(INVALID
、MERGE
、REMOVE
、INSERT_BEFORE
、INSERT_AFTER
、REPLACE
)时,
会出现此消息。使用相对补丁操作意味着当评估当前的 EnvoyFilter
过滤器时该操作依赖于另一个过滤器。
为了确保按照用户想要的顺序应用 EnvoyFilters
,应该赋予一个优先级或者应该使用一个非相对操作(ADD
或 INSERT_FIRST
)。
示例
以一个带有 INSERT_BEFORE
补丁操作的 EnvoyFilter
为例:
apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
name: test-relative
namespace: bookinfo
spec:
workloadSelector:
labels:
app: reviews2
configPatches:
# 第一个补丁将 Lua 过滤器添加到 listener/http 连接管理器
- applyTo: HTTP_FILTER
match:
context: SIDECAR_INBOUND
listener:
portNumber: 8080
filterChain:
filter:
name: "envoy.filters.network.http_connection_manager"
subFilter:
name: "envoy.filters.http.router"
patch:
operation: INSERT_BEFORE
value: # Lua filter specification
name: envoy.lua
typed_config:
"@type": "type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua"
inlineCode: |
function envoy_on_request(request_handle)
-- Make an HTTP call to an upstream host with the following headers, body, and timeout.
local headers, body = request_handle:httpCall(
"lua_cluster",
{
[":method"] = "POST",
[":path"] = "/acl",
[":authority"] = "internal.org.net"
},
"authorize call",
5000)
end
解决办法
由于原来使用了 INSERT_BEFORE
的相对操作,所以现在将其更改为 INSERT_FIRST
的绝对操作将解决这个问题:
apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
name: test-relative
namespace: bookinfo
spec:
workloadSelector:
labels:
app: reviews2
configPatches:
# 第一个补丁将 Lua 过滤器添加到 listener/http 连接管理器
- applyTo: HTTP_FILTER
match:
context: SIDECAR_INBOUND
listener:
portNumber: 8080
filterChain:
filter:
name: "envoy.filters.network.http_connection_manager"
subFilter:
name: "envoy.filters.http.router"
patch:
operation: INSERT_FIRST
value: # Lua 过滤器规范
name: envoy.lua
typed_config:
"@type": "type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua"
inlineCode: |
function envoy_on_request(request_handle)
-- Make an HTTP call to an upstream host with the following headers, body, and timeout.
local headers, body = request_handle:httpCall(
"lua_cluster",
{
[":method"] = "POST",
[":path"] = "/acl",
[":authority"] = "internal.org.net"
},
"authorize call",
5000)
end