Rebased.

Addressing PR comments.
Simplifying PrefixPreferSource logic
Adding example to readme

README.md

@@ -158,8 +158,11 @@ tenant:
 
   # If true will use the tenant ID of the inbound request as the prefix of the new tenant id.
   # Will be automatically suffixed with a `-` character.
+  # Example:
+  #   Prometheus forwards metrics with `X-Scope-OrgID: Prom-A` set in the inbound request.
+  #   This would result in the tenant prefix being set to `Prom-A-`.
   # https://grafana.com/docs/mimir/latest/configure/about-tenant-ids/
-  # env: CT_TENANT_PREFIX
+  # env: CT_TENANT_PREFIX_PREFER_SOURCE
   prefix_prefer_source: false
 ```
 

VERSION

@@ -1 +1 @@
-1.12.4
+1.12.5

config.go

@@ -37,13 +37,14 @@ type config struct {
 	}
 
 	Tenant struct {
-		Label              string `env:"CT_TENANT_LABEL"`
+		Label              string   `env:"CT_TENANT_LABEL"`
 		LabelList          []string `yaml:"label_list" env:"CT_TENANT_LABEL_LIST" envSeparator:","`
-		Prefix             string `yaml:"prefix" env:"CT_TENANT_PREFIX"`
-		LabelRemove        bool   `yaml:"label_remove" env:"CT_TENANT_LABEL_REMOVE"`
-		Header             string `env:"CT_TENANT_HEADER"`
-		Default            string `env:"CT_TENANT_DEFAULT"`
-		AcceptAll          bool   `yaml:"accept_all" env:"CT_TENANT_ACCEPT_ALL"`
+		Prefix             string   `yaml:"prefix" env:"CT_TENANT_PREFIX"`
+		PrefixPreferSource bool     `yaml:"prefix_prefer_source" env:"CT_TENANT_PREFIX_PREFER_SOURCE`
+		LabelRemove        bool     `yaml:"label_remove" env:"CT_TENANT_LABEL_REMOVE"`
+		Header             string   `env:"CT_TENANT_HEADER"`
+		Default            string   `env:"CT_TENANT_DEFAULT"`
+		AcceptAll          bool     `yaml:"accept_all" env:"CT_TENANT_ACCEPT_ALL"`
 	}
 
 	pipeIn  *fhu.InmemoryListener

deploy/k8s/chart/Chart.yaml

@@ -1,8 +1,8 @@
 apiVersion: v2
 description: A Helm Chart for cortex-tenant
 name: cortex-tenant
-version: 0.4.1 # This is the chart version
-appVersion: 1.12.4 # version number of the application being deployed.
+version: 0.4.2 # This is the chart version
+appVersion: 1.12.5 # version number of the application being deployed.
 type: application
 sources:
   - https://github.com/blind-oracle/cortex-tenant

deploy/k8s/chart/values.yaml

@@ -101,6 +101,7 @@ config:
     # (env: `CT_TENANT_LABEL`)
     label: tenant
     # -- List of labels examined for tenant information. If set takes precedent over `label`
+    # (env: `CT_TENANT_LABEL_LIST`)
     label_list: []
     # -- Optional hard-coded prefix with delimeter for all tenant values.
     # Delimeters allowed for use:
@@ -109,6 +110,9 @@ config:
     prefix: ""
     # -- If true will use the tenant ID of the inbound request as the prefix of the new tenant id.
     # Will be automatically suffixed with a `-` character.
+    # Example:
+    #   Prometheus forwards metrics with `X-Scope-OrgID: Prom-A` set in the inbound request.
+    #   This would result in the tenant prefix being set to `Prom-A-`.
     # (env: `CT_TENANT_PREFIX_PREFER_SOURCE`)
     prefix_prefer_source: false
     # -- Whether to remove the tenant label from the request

deploy/k8s/manifests/config-file-configmap.yml

@@ -44,6 +44,9 @@ data:
       prefix: ""
       # If true will use the tenant ID of the inbound request as the prefix of the new tenant id.
       # Will be automatically suffixed with a `-` character.
+      # Example:
+      #   Prometheus forwards metrics with `X-Scope-OrgID: Prom-A` set in the inbound request.
+      #   This would result in the tenant prefix being set to `Prom-A-`.
       # https://grafana.com/docs/mimir/latest/configure/about-tenant-ids/
       prefix_prefer_source: false
       # Whether to remove the tenant label from the request

processor.go

@@ -170,11 +170,10 @@ func (p *processor) handle(ctx *fh.RequestCtx) {
 		return
 	}
 
-	tenantPrefix := p.cfg.Tenant.Prefix
-
 	if p.cfg.Tenant.PrefixPreferSource {
-		if string(ctx.Request.Header.Peek("X-Scope-OrgID")) != "" {
-			tenantPrefix = string(ctx.Request.Header.Peek("X-Scope-OrgID")) + "-"
+		sourceTenantPrefix := string(ctx.Request.Header.Peek(p.cfg.Tenant.Header))
+		if sourceTenantPrefix != "" {
+			p.cfg.Tenant.Prefix = sourceTenantPrefix + "-"
 		}
 	}
 
@@ -185,7 +184,7 @@ func (p *processor) handle(ctx *fh.RequestCtx) {
 		// If there's metadata - just accept the request and drop it
 		if len(wrReqIn.Metadata) > 0 {
 			if p.cfg.Metadata && p.cfg.Tenant.Default != "" {
-				r := p.send(clientIP, reqID, tenantPrefix, p.cfg.Tenant.Default, wrReqIn)
+				r := p.send(clientIP, reqID, p.cfg.Tenant.Default, wrReqIn)
 				if r.err != nil {
 					ctx.Error(err.Error(), fh.StatusInternalServerError)
 					p.Errorf("src=%s req_id=%s: unable to proxy metadata: %s", clientIP, reqID, r.err)
@@ -210,7 +209,7 @@ func (p *processor) handle(ctx *fh.RequestCtx) {
 
 	metricTenant := ""
 	var errs *me.Error
-	results := p.dispatch(clientIP, reqID, tenantPrefix, m)
+	results := p.dispatch(clientIP, reqID, m)
 
 	code, body := 0, []byte("Ok")
 
@@ -312,7 +311,7 @@ func (p *processor) marshal(wr *prompb.WriteRequest) (bufOut []byte, err error)
 	return snappy.Encode(nil, b), nil
 }
 
-func (p *processor) dispatch(clientIP net.Addr, reqID uuid.UUID, tenantPrefix string, m map[string]*prompb.WriteRequest) (res []result) {
+func (p *processor) dispatch(clientIP net.Addr, reqID uuid.UUID, m map[string]*prompb.WriteRequest) (res []result) {
 	var wg sync.WaitGroup
 	res = make([]result, len(m))
 
@@ -323,7 +322,7 @@ func (p *processor) dispatch(clientIP net.Addr, reqID uuid.UUID, tenantPrefix st
 		go func(idx int, tenant string, wrReq *prompb.WriteRequest) {
 			defer wg.Done()
 
-			r := p.send(clientIP, reqID, tenantPrefix, tenant, wrReq)
+			r := p.send(clientIP, reqID, tenant, wrReq)
 			res[idx] = r
 		}(i, tenant, wrReq)
 
@@ -368,7 +367,7 @@ func (p *processor) processTimeseries(ts *prompb.TimeSeries) (tenant string, err
 	return
 }
 
-func (p *processor) send(clientIP net.Addr, reqID uuid.UUID, tenantPrefix string, tenant string, wr *prompb.WriteRequest) (r result) {
+func (p *processor) send(clientIP net.Addr, reqID uuid.UUID, tenant string, wr *prompb.WriteRequest) (r result) {
 	start := time.Now()
 	r.tenant = tenant
 
@@ -386,7 +385,7 @@ func (p *processor) send(clientIP net.Addr, reqID uuid.UUID, tenantPrefix string
 		return
 	}
 
-	p.fillRequestHeaders(clientIP, reqID, tenantPrefix, tenant, req)
+	p.fillRequestHeaders(clientIP, reqID, tenant, req)
 
 	if p.auth.egressHeader != nil {
 		req.Header.SetBytesV("Authorization", p.auth.egressHeader)
@@ -410,14 +409,14 @@ func (p *processor) send(clientIP net.Addr, reqID uuid.UUID, tenantPrefix string
 }
 
 func (p *processor) fillRequestHeaders(
-	clientIP net.Addr, reqID uuid.UUID, tenantPrefix string, tenant string, req *fh.Request) {
+	clientIP net.Addr, reqID uuid.UUID, tenant string, req *fh.Request) {
 	req.Header.Set("Content-Encoding", "snappy")
 	req.Header.Set("Content-Type", "application/x-protobuf")
 	req.Header.Set("X-Prometheus-Remote-Write-Version", "0.1.0")
 	req.Header.Set("X-Cortex-Tenant-Client", clientIP.String())
 	req.Header.Set("X-Cortex-Tenant-ReqID", reqID.String())
-	if tenantPrefix != "" {
-		tenant = tenantPrefix + tenant
+	if p.cfg.Tenant.Prefix != "" {
+		tenant = p.cfg.Tenant.Prefix + tenant
 	}
 	req.Header.Set(p.cfg.Tenant.Header, tenant)
 }

processor_test.go

@@ -226,7 +226,7 @@ func Test_request_headers(t *testing.T) {
 	req := fh.AcquireRequest()
 	clientIP, _ := net.ResolveIPAddr("ip", "1.1.1.1")
 	reqID, _ := uuid.NewRandom()
-	p.fillRequestHeaders(clientIP, reqID, "", "my-tenant", req)
+	p.fillRequestHeaders(clientIP, reqID, "my-tenant", req)
 
 	assert.Equal(t, "snappy", string(req.Header.Peek("Content-Encoding")))
 	assert.Equal(t, "my-tenant", string(req.Header.Peek("X-Scope-OrgID")))
@@ -241,7 +241,7 @@ func Test_request_headers_with_prefix(t *testing.T) {
 	req := fh.AcquireRequest()
 	clientIP, _ := net.ResolveIPAddr("ip", "1.1.1.1")
 	reqID, _ := uuid.NewRandom()
-	p.fillRequestHeaders(clientIP, reqID, "foobar-", "my-tenant", req)
+	p.fillRequestHeaders(clientIP, reqID, "my-tenant", req)
 
 	assert.Equal(t, "foobar-my-tenant", string(req.Header.Peek("X-Scope-OrgID")))
 }